Collection: Bearings - Single Row Ball - Unflanged

Bearings -> Single Row Ball -> Unflanged
ID (d) O.D. (D) Width (B) Inner Ring Width (Bn) Flange Diameter (DF) Flange Width (BF) Indicative
Image
Single Row Ball Bearings - 4x8x3 mm Flanged - Stainless Steel AISI 440C - Ceramic Si3N4 Balls Bearing
ID (d)
4.000
mm
O.D. (D)
8.000
mm
Width (B)
3.000
mm
Flange Diameter (DF)
9.200
Flange Width (BF)
0.600
Single Row Ball Bearings - 4x8x3 mm - Stainless Steel AISI 440C - Ceramic Si3N4 Balls
Material: Stainless Steel AISI 440C - Ceramic Si3N4 Balls    Precision Grade: Abec 1   
Category: Bearings - Single Row Ball - Flanged - Precision
Ceramic balls.
Part Number: SFMR84A-CSN-ZZS-ACO-ECO (Each)
1 Available Now | Further orders can be expected around Fri, Aug 28, 2026
Regular price $17.59 AUD
Regular price $44.58 AUD Sale price $17.59 AUD
Each
Excludes GST and overseas Taxes & Duties
Quantity Required

Larger quantities than the 1 available can be backordered.
ID (d) O.D. (D) Width (B) Inner Ring Width (Bn) Indicative
Image
Single Row Ball Bearings - 4x8x3 mm Flanged - Stainless Steel AISI 440C - Ceramic Si3N4 Balls Bearing
ID (d)
4.000
mm
O.D. (D)
8.000
mm
Width (B)
3.000
mm
Single Row Ball Bearings - 4x8x3 mm - Stainless Steel AISI 440C - Ceramic Si3N4 Balls
Material: Stainless Steel AISI 440C - Ceramic Si3N4 Balls    Flange Diameter (DF): 9.200    Flange Width (BF): 0.600    Precision Grade: Abec 1   
Category: Bearings - Single Row Ball - Flanged - Precision
Ceramic balls.
Part Number: SFMR84A-CSN-ZZS-ACO-ECO (Each)
1 Available Now | Further orders can be expected around Fri, Aug 28, 2026
Regular price $17.59 AUD
Regular price $44.58 AUD Sale price $17.59 AUD
Each
Excludes GST and overseas Taxes & Duties
Quantity Required

1 Available Now. Backorder if more than 1.
Single Row Ball Bearings - 4x8x3 mm Unflanged - Chrome Steel SAE 52100 Bearing
ID (d)
4.000
mm
+ 0.000 / - 0.007
(Equiv. 0.157 in.)
O.D. (D)
8.000
mm
+ 0.000 / - 0.007
(Equiv. 0.315 in.)
Width (B)
3.000
mm
+ 0.000 / - 0.120
(Equiv. 0.118 in.)
Single Row Ball Bearings - 4x8x3 mm - Chrome Steel SAE 52100
Material: Chrome Steel SAE 52100    Precision Grade: P6   
Category: Bearings - Single Row Ball - Unflanged - Precision
Part Number: MR84A-ZZ-MC3-JP6 (PK-50)
Contact Us | Special Order Only - Please contact us if you need a large quantity
Single Row Ball Bearings - 4x8x3 mm Unflanged - Chrome Steel SAE 52100 Bearing
ID (d)
4.000
mm
+ 0.000 / - 0.007
(Equiv. 0.157 in.)
O.D. (D)
8.000
mm
+ 0.000 / - 0.007
(Equiv. 0.315 in.)
Width (B)
3.000
mm
+ 0.000 / - 0.120
(Equiv. 0.118 in.)
Single Row Ball Bearings - 4x8x3 mm - Chrome Steel SAE 52100
Material: Chrome Steel SAE 52100    Precision Grade: P6   
Category: Bearings - Single Row Ball - Unflanged - Precision
Part Number: MR84A-ZZ-MC3-JP6 (PK-50)
Contact Us | Special Order Only - Please contact us if you need a large quantity | Backorder now for delivery around Wed, Apr 11, 2029
Single Row Ball Bearings - 4x8x5 mm Unflanged - Chrome Steel SAE 52100 Bearing
ID (d)
4.000
mm
O.D. (D)
8.000
mm
Width (B)
5.000
mm
Single Row Ball Bearings - 4x8x5 mm - Chrome Steel SAE 52100
Material: Chrome Steel SAE 52100    Precision Grade: Economy   
Category: Bearings - Single Row Ball - Unflanged - Precision
Deleted Item. Available while stocks last. Non ISO Width
Part Number: MR84D-ZZS-ECO (Each)
16 Available Now | Item Discontinued - Up to 16 may be ordered online. No backorders. Please contact us if you need a larger quantity
Regular price $8.00 AUD
Regular price $15.20 AUD Sale price $8.00 AUD
Each
Excludes GST and overseas Taxes & Duties
Quantity Required

16 Available Now. These are priced to quit. Please contact us for a quote if you require more.
Single Row Ball Bearings - 4x8x5 mm Unflanged - Chrome Steel SAE 52100 Bearing
ID (d)
4.000
mm
O.D. (D)
8.000
mm
Width (B)
5.000
mm
Single Row Ball Bearings - 4x8x5 mm - Chrome Steel SAE 52100
Material: Chrome Steel SAE 52100    Precision Grade: Economy   
Category: Bearings - Single Row Ball - Unflanged - Precision
Deleted Item. Available while stocks last. Non ISO Width
Part Number: MR84D-ZZS-ECO (Each)
16 Available Now | Item Discontinued - Up to 16 may be ordered online. No backorders. Please contact us if you need a larger quantity
Regular price $8.00 AUD
Regular price $15.20 AUD Sale price $8.00 AUD
Each
Excludes GST and overseas Taxes & Duties
Quantity Required

16 Available Now. These are priced to quit. Please contact us for a quote if you require more.
Single Row Ball Bearings - 4x9x2.5 mm Unflanged - Stainless Steel AISI 440C Bearing
ID (d)
4.000
mm
+ 0.000 / - 0.0075
(Equiv. 0.157 in.)
O.D. (D)
9.000
mm
+ 0.000 / - 0.0075
(Equiv. 0.354 in.)
Width (B)
2.500
mm
+ 0.000 / - 0.125
(Equiv. 0.098 in.)
Single Row Ball Bearings - 4x9x2.5 mm - Stainless Steel AISI 440C
Material: Stainless Steel AISI 440C    Precision Grade: Abec 1   
Category: Bearings - Single Row Ball - Unflanged - Precision
Part Number: S684-MC2-AF12 (PK-100)
Out of Stock | Backorder Now | Backorder now for delivery around Thu, Aug 20, 2026
Regular price $352.14 AUD
Regular price $422.56 AUD Sale price $352.14 AUD
Priced, Stocked and Sold Per 100 Units
Excludes GST and overseas Taxes & Duties
Quantity Required

Backorder: Out of Stock.
Single Row Ball Bearings - 4x9x2.5 mm Unflanged - Stainless Steel AISI 440C Bearing
ID (d)
4.000
mm
+ 0.000 / - 0.0075
(Equiv. 0.157 in.)
O.D. (D)
9.000
mm
+ 0.000 / - 0.0075
(Equiv. 0.354 in.)
Width (B)
2.500
mm
+ 0.000 / - 0.125
(Equiv. 0.098 in.)
Single Row Ball Bearings - 4x9x2.5 mm - Stainless Steel AISI 440C
Material: Stainless Steel AISI 440C    Precision Grade: Abec 1   
Category: Bearings - Single Row Ball - Unflanged - Precision
Part Number: S684-MC2-AF12 (PK-100)
Out of Stock | Backorder Now | Backorder now for delivery around Thu, Aug 20, 2026
Regular price $352.14 AUD
Regular price $422.56 AUD Sale price $352.14 AUD
Priced, Stocked and Sold Per 100 Units
Excludes GST and overseas Taxes & Duties
Quantity Required

Backorder: Out of Stock.
Single Row Ball Bearings - 4x9x2.5 mm Unflanged - Stainless Steel AISI 440C - Ribbon Retainer Low Torque Bearing
ID (d)
4.000
mm
+ 0.000 / - 0.005
(Equiv. 0.157 in.)
O.D. (D)
9.000
mm
+ 0.000 / - 0.005
(Equiv. 0.354 in.)
Width (B)
2.500
mm
+ 0.000 / - 0.040
(Equiv. 0.098 in.)
Single Row Ball Bearings - 4x9x2.5 mm - Stainless Steel AISI 440C - Ribbon Retainer Low Torque
Material: Stainless Steel AISI 440C - Ribbon Retainer Low Torque    Precision Grade: Abec 5   
Category: Bearings - Single Row Ball - Unflanged - High Precision
Part Number: S684-MC34-GR5-L23 (PK-40)
Out of Stock | Backorder Now | Backorder now for delivery around Sat, Sep 12, 2026
Regular price $1,056.86 AUD
Regular price Sale price $1,056.86 AUD
Priced, Stocked and Sold Per 40 Units
Excludes GST and overseas Taxes & Duties
Quantity Required

Backorder: Out of Stock.
Single Row Ball Bearings - 4x9x2.5 mm Unflanged - Stainless Steel AISI 440C - Ribbon Retainer Low Torque Bearing
ID (d)
4.000
mm
+ 0.000 / - 0.005
(Equiv. 0.157 in.)
O.D. (D)
9.000
mm
+ 0.000 / - 0.005
(Equiv. 0.354 in.)
Width (B)
2.500
mm
+ 0.000 / - 0.040
(Equiv. 0.098 in.)
Single Row Ball Bearings - 4x9x2.5 mm - Stainless Steel AISI 440C - Ribbon Retainer Low Torque
Material: Stainless Steel AISI 440C - Ribbon Retainer Low Torque    Precision Grade: Abec 5   
Category: Bearings - Single Row Ball - Unflanged - High Precision
Part Number: S684-MC34-GR5-L23 (PK-40)
Out of Stock | Backorder Now | Backorder now for delivery around Sat, Sep 12, 2026
Regular price $1,056.86 AUD
Regular price Sale price $1,056.86 AUD
Priced, Stocked and Sold Per 40 Units
Excludes GST and overseas Taxes & Duties
Quantity Required

Backorder: Out of Stock.
Single Row Ball Bearings - 4x9x2.5 mm Unflanged - Stainless Steel AISI 440C Bearing
ID (d)
4.000
mm
+ 0.000 / - 0.0075
(Equiv. 0.157 in.)
O.D. (D)
9.000
mm
+ 0.000 / - 0.0075
(Equiv. 0.354 in.)
Width (B)
2.500
mm
+ 0.000 / - 0.125
(Equiv. 0.098 in.)
Single Row Ball Bearings - 4x9x2.5 mm - Stainless Steel AISI 440C
Material: Stainless Steel AISI 440C    Precision Grade: Abec 1   
Category: Bearings - Single Row Ball - Unflanged - Precision
Part Number: S684-MC3-AF12 (Each)
Out of Stock | Backorder Now | Backorder now for delivery around Thu, Aug 20, 2026
Regular price $5.77 AUD
Regular price Sale price $5.77 AUD
Each
Excludes GST and overseas Taxes & Duties
Quantity Required

Backorder: Out of Stock.
Single Row Ball Bearings - 4x9x2.5 mm Unflanged - Stainless Steel AISI 440C Bearing
ID (d)
4.000
mm
+ 0.000 / - 0.0075
(Equiv. 0.157 in.)
O.D. (D)
9.000
mm
+ 0.000 / - 0.0075
(Equiv. 0.354 in.)
Width (B)
2.500
mm
+ 0.000 / - 0.125
(Equiv. 0.098 in.)
Single Row Ball Bearings - 4x9x2.5 mm - Stainless Steel AISI 440C
Material: Stainless Steel AISI 440C    Precision Grade: Abec 1   
Category: Bearings - Single Row Ball - Unflanged - Precision
Part Number: S684-MC3-AF12 (Each)
Out of Stock | Backorder Now | Backorder now for delivery around Thu, Aug 20, 2026
Regular price $5.77 AUD
Regular price Sale price $5.77 AUD
Each
Excludes GST and overseas Taxes & Duties
Quantity Required

Backorder: Out of Stock.
Single Row Ball Bearings - 4x9x2.5 mm Unflanged - Stainless Steel AISI 440C - Ribbon Retainer Low Torque Bearing
ID (d)
4.000
mm
+ 0.000 / - 0.004
(Equiv. 0.157 in.)
O.D. (D)
9.000
mm
+ 0.000 / - 0.005
(Equiv. 0.354 in.)
Width (B)
2.500
mm
+ 0.000 / - 0.040
(Equiv. 0.098 in.)
Single Row Ball Bearings - 4x9x2.5 mm - Stainless Steel AISI 440C - Ribbon Retainer Low Torque
Material: Stainless Steel AISI 440C - Ribbon Retainer Low Torque    Precision Grade: Abec 7   
Category: Bearings - Single Row Ball - Unflanged - High Precision
Part Number: S684-MC34-GR7-R-L23 (PK-68)
Out of Stock | Backorder Now | Backorder now for delivery around Sat, Sep 12, 2026
Regular price $2,550.95 AUD
Regular price $3,061.15 AUD Sale price $2,550.95 AUD
Priced, Stocked and Sold Per 68 Units
Excludes GST and overseas Taxes & Duties
Quantity Required

Backorder: Out of Stock.
Single Row Ball Bearings - 4x9x2.5 mm Unflanged - Stainless Steel AISI 440C - Ribbon Retainer Low Torque Bearing
ID (d)
4.000
mm
+ 0.000 / - 0.004
(Equiv. 0.157 in.)
O.D. (D)
9.000
mm
+ 0.000 / - 0.005
(Equiv. 0.354 in.)
Width (B)
2.500
mm
+ 0.000 / - 0.040
(Equiv. 0.098 in.)
Single Row Ball Bearings - 4x9x2.5 mm - Stainless Steel AISI 440C - Ribbon Retainer Low Torque
Material: Stainless Steel AISI 440C - Ribbon Retainer Low Torque    Precision Grade: Abec 7   
Category: Bearings - Single Row Ball - Unflanged - High Precision
Part Number: S684-MC34-GR7-R-L23 (PK-68)
Out of Stock | Backorder Now | Backorder now for delivery around Sat, Sep 12, 2026
Regular price $2,550.95 AUD
Regular price $3,061.15 AUD Sale price $2,550.95 AUD
Priced, Stocked and Sold Per 68 Units
Excludes GST and overseas Taxes & Duties
Quantity Required

Backorder: Out of Stock.
Single Row Ball Bearings - 4x9x2.5 mm Unflanged - Stainless Steel AISI 440C Bearing
ID (d)
4.000
mm
+ 0.000 / - 0.005
(Equiv. 0.157 in.)
O.D. (D)
9.000
mm
+ 0.000 / - 0.005
(Equiv. 0.354 in.)
Width (B)
2.500
mm
+ 0.000 / - 0.040
(Equiv. 0.098 in.)
Single Row Ball Bearings - 4x9x2.5 mm - Stainless Steel AISI 440C
Material: Stainless Steel AISI 440C    Precision Grade: Abec 5   
Category: Bearings - Single Row Ball - Unflanged - High Precision
Part Number: S684-MC4-GR5-R-AF12 (PK-1000)
Out of Stock | Backorder Now | Backorder now for delivery around Fri, Nov 20, 2026
Regular price $8,620.50 AUD
Regular price Sale price $8,620.50 AUD
Priced, Stocked and Sold Per 1000 Units
Excludes GST and overseas Taxes & Duties
Quantity Required

Backorder: Out of Stock.
Single Row Ball Bearings - 4x9x2.5 mm Unflanged - Stainless Steel AISI 440C Bearing
ID (d)
4.000
mm
+ 0.000 / - 0.005
(Equiv. 0.157 in.)
O.D. (D)
9.000
mm
+ 0.000 / - 0.005
(Equiv. 0.354 in.)
Width (B)
2.500
mm
+ 0.000 / - 0.040
(Equiv. 0.098 in.)
Single Row Ball Bearings - 4x9x2.5 mm - Stainless Steel AISI 440C
Material: Stainless Steel AISI 440C    Precision Grade: Abec 5   
Category: Bearings - Single Row Ball - Unflanged - High Precision
Part Number: S684-MC4-GR5-R-AF12 (PK-1000)
Out of Stock | Backorder Now | Backorder now for delivery around Fri, Nov 20, 2026
Regular price $8,620.50 AUD
Regular price Sale price $8,620.50 AUD
Priced, Stocked and Sold Per 1000 Units
Excludes GST and overseas Taxes & Duties
Quantity Required

Backorder: Out of Stock.
Single Row Ball Bearings - 4x9x2.5 mm Unflanged - Chrome Steel SAE 52100 Bearing
ID (d)
4.000
mm
O.D. (D)
9.000
mm
Width (B)
2.500
mm
Single Row Ball Bearings - 4x9x2.5 mm - Chrome Steel SAE 52100
Material: Chrome Steel SAE 52100    Precision Grade: Economy   
Category: Bearings - Single Row Ball - Unflanged - Precision
Part Number: 684-ZZS-ECO (Each)
19 Available Now | Further orders can be expected around Fri, Aug 14, 2026
Regular price $1.86 AUD
Regular price Sale price $1.86 AUD
Each
Excludes GST and overseas Taxes & Duties
Quantity Required

Larger quantities than the 19 available can be backordered.
Single Row Ball Bearings - 4x9x2.5 mm Unflanged - Chrome Steel SAE 52100 Bearing
ID (d)
4.000
mm
O.D. (D)
9.000
mm
Width (B)
2.500
mm
Single Row Ball Bearings - 4x9x2.5 mm - Chrome Steel SAE 52100
Material: Chrome Steel SAE 52100    Precision Grade: Economy   
Category: Bearings - Single Row Ball - Unflanged - Precision
Part Number: 684-ZZS-ECO (Each)
19 Available Now | Further orders can be expected around Fri, Aug 14, 2026
Regular price $1.86 AUD
Regular price Sale price $1.86 AUD
Each
Excludes GST and overseas Taxes & Duties
Quantity Required

19 Available Now. Backorder if more than 19.
Single Row Ball Bearings - 4x9x2.5 mm Unflanged - Chrome Steel SAE 52100 Bearing
ID (d)
4.000
mm
+ 0.000 / - 0.0075
(Equiv. 0.157 in.)
O.D. (D)
9.000
mm
+ 0.000 / - 0.0075
(Equiv. 0.354 in.)
Width (B)
2.500
mm
+ 0.000 / - 0.125
(Equiv. 0.098 in.)
Single Row Ball Bearings - 4x9x2.5 mm - Chrome Steel SAE 52100
Material: Chrome Steel SAE 52100    Precision Grade: Abec 1   
Category: Bearings - Single Row Ball - Unflanged - Precision
Part Number: 684-MC3-AF12 (Each)
222 Available Now | Further orders can be expected around Thu, Aug 20, 2026
Regular price $3.68 AUD
Regular price Sale price $3.68 AUD
Each
Excludes GST and overseas Taxes & Duties
Quantity Required

Larger quantities than the 222 available can be backordered.
Single Row Ball Bearings - 4x9x2.5 mm Unflanged - Chrome Steel SAE 52100 Bearing
ID (d)
4.000
mm
+ 0.000 / - 0.0075
(Equiv. 0.157 in.)
O.D. (D)
9.000
mm
+ 0.000 / - 0.0075
(Equiv. 0.354 in.)
Width (B)
2.500
mm
+ 0.000 / - 0.125
(Equiv. 0.098 in.)
Single Row Ball Bearings - 4x9x2.5 mm - Chrome Steel SAE 52100
Material: Chrome Steel SAE 52100    Precision Grade: Abec 1   
Category: Bearings - Single Row Ball - Unflanged - Precision
Part Number: 684-MC3-AF12 (Each)
222 Available Now | Further orders can be expected around Thu, Aug 20, 2026
Regular price $3.68 AUD
Regular price Sale price $3.68 AUD
Each
Excludes GST and overseas Taxes & Duties
Quantity Required

222 Available Now. Backorder if more than 222.
Single Row Ball Bearings - 4x9x3 mm Unflanged - Chrome Steel SAE 52100 Bearing
ID (d)
4.000
mm
O.D. (D)
9.000
mm
Width (B)
3.000
mm
Single Row Ball Bearings - 4x9x3 mm - Chrome Steel SAE 52100
Material: Chrome Steel SAE 52100    Precision Grade: Economy   
Category: Bearings - Single Row Ball - Unflanged - Precision
Part Number: 684D-ZZS-ECO (Each)
88 Available Now | Further orders can be expected around Fri, Aug 14, 2026
Regular price $3.59 AUD
Regular price Sale price $3.59 AUD
Each
Excludes GST and overseas Taxes & Duties
Quantity Required

Larger quantities than the 88 available can be backordered.
Single Row Ball Bearings - 4x9x3 mm Unflanged - Chrome Steel SAE 52100 Bearing
ID (d)
4.000
mm
O.D. (D)
9.000
mm
Width (B)
3.000
mm
Single Row Ball Bearings - 4x9x3 mm - Chrome Steel SAE 52100
Material: Chrome Steel SAE 52100    Precision Grade: Economy   
Category: Bearings - Single Row Ball - Unflanged - Precision
Part Number: 684D-ZZS-ECO (Each)
88 Available Now | Further orders can be expected around Fri, Aug 14, 2026
Regular price $3.59 AUD
Regular price Sale price $3.59 AUD
Each
Excludes GST and overseas Taxes & Duties
Quantity Required

88 Available Now. Backorder if more than 88.
Single Row Ball Bearings - 4x9x3.5 mm Unflanged - Stainless Steel AISI 440C Bearing
ID (d)
4.000
mm
+ 0.000 / - 0.0075
(Equiv. 0.157 in.)
O.D. (D)
9.000
mm
+ 0.000 / - 0.0075
(Equiv. 0.354 in.)
Width (B)
3.500
mm
+ 0.000 / - 0.125
(Equiv. 0.138 in.)
Single Row Ball Bearings - 4x9x3.5 mm - Stainless Steel AISI 440C
Material: Stainless Steel AISI 440C    Precision Grade: Abec 1   
Category: Bearings - Single Row Ball - Unflanged - Precision
Non ISO Width
Part Number: S684B-ZZ-MC3 (Each)
97 Available Now | Further orders can be expected around Thu, Aug 20, 2026
Regular price $4.50 AUD
Regular price Sale price $4.50 AUD
Each
Excludes GST and overseas Taxes & Duties
Quantity Required

Larger quantities than the 97 available can be backordered.
Single Row Ball Bearings - 4x9x3.5 mm Unflanged - Stainless Steel AISI 440C Bearing
ID (d)
4.000
mm
+ 0.000 / - 0.0075
(Equiv. 0.157 in.)
O.D. (D)
9.000
mm
+ 0.000 / - 0.0075
(Equiv. 0.354 in.)
Width (B)
3.500
mm
+ 0.000 / - 0.125
(Equiv. 0.138 in.)
Single Row Ball Bearings - 4x9x3.5 mm - Stainless Steel AISI 440C
Material: Stainless Steel AISI 440C    Precision Grade: Abec 1   
Category: Bearings - Single Row Ball - Unflanged - Precision
Non ISO Width
Part Number: S684B-ZZ-MC3 (Each)
97 Available Now | Further orders can be expected around Thu, Aug 20, 2026
Regular price $4.50 AUD
Regular price Sale price $4.50 AUD
Each
Excludes GST and overseas Taxes & Duties
Quantity Required

97 Available Now. Backorder if more than 97.
Single Row Ball Bearings - 4x9x3.5 mm Unflanged - Chrome Steel SAE 52100 Bearing
ID (d)
4.000
mm
+ 0.000 / - 0.0075
(Equiv. 0.157 in.)
O.D. (D)
9.000
mm
+ 0.000 / - 0.0075
(Equiv. 0.354 in.)
Width (B)
3.500
mm
+ 0.000 / - 0.125
(Equiv. 0.138 in.)
Single Row Ball Bearings - 4x9x3.5 mm - Chrome Steel SAE 52100
Material: Chrome Steel SAE 52100    Precision Grade: Abec 1   
Category: Bearings - Single Row Ball - Unflanged - Precision
Non ISO Width
Part Number: 684B-ZZ-MC3 (Each)
258 Available Now | Further orders can be expected around Thu, Aug 20, 2026
Regular price $4.95 AUD
Regular price Sale price $4.95 AUD
Each
Excludes GST and overseas Taxes & Duties
Quantity Required

Larger quantities than the 258 available can be backordered.
Single Row Ball Bearings - 4x9x3.5 mm Unflanged - Chrome Steel SAE 52100 Bearing
ID (d)
4.000
mm
+ 0.000 / - 0.0075
(Equiv. 0.157 in.)
O.D. (D)
9.000
mm
+ 0.000 / - 0.0075
(Equiv. 0.354 in.)
Width (B)
3.500
mm
+ 0.000 / - 0.125
(Equiv. 0.138 in.)
Single Row Ball Bearings - 4x9x3.5 mm - Chrome Steel SAE 52100
Material: Chrome Steel SAE 52100    Precision Grade: Abec 1   
Category: Bearings - Single Row Ball - Unflanged - Precision
Non ISO Width
Part Number: 684B-ZZ-MC3 (Each)
258 Available Now | Further orders can be expected around Thu, Aug 20, 2026
Regular price $4.95 AUD
Regular price Sale price $4.95 AUD
Each
Excludes GST and overseas Taxes & Duties
Quantity Required

258 Available Now. Backorder if more than 258.
Single Row Ball Bearings - 4x9x4 mm Unflanged - Stainless Steel AISI 440C - Phenolic Retainer Bearing
ID (d)
4.000
mm
+ 0.000 / - 0.005
(Equiv. 0.157 in.)
O.D. (D)
9.000
mm
+ 0.000 / - 0.005
(Equiv. 0.354 in.)
Width (B)
4.000
mm
+ 0.000 / - 0.040
(Equiv. 0.157 in.)
Single Row Ball Bearings - 4x9x4 mm Unflanged - Stainless Steel AISI 440C - Phenolic Retainer Bearing
Material: Stainless Steel AISI 440C - Phenolic Retainer    Precision Grade: P5P   
Category: Bearings - Single Row Ball - Unflanged - High Precision
Part Number: S684A-ZZS-MC3-GR5-KC-L23 (PK-20)
Out of Stock | Backorder Now | Backorder now for delivery around Sat, Sep 12, 2026
Regular price $1,504.05 AUD
Regular price Sale price $1,504.05 AUD
Priced, Stocked and Sold Per 20 Units
Excludes GST and overseas Taxes & Duties
Quantity Required

Backorder: Out of Stock.
Single Row Ball Bearings - 4x9x4 mm Unflanged - Stainless Steel AISI 440C - Phenolic Retainer Bearing
ID (d)
4.000
mm
+ 0.000 / - 0.005
(Equiv. 0.157 in.)
O.D. (D)
9.000
mm
+ 0.000 / - 0.005
(Equiv. 0.354 in.)
Width (B)
4.000
mm
+ 0.000 / - 0.040
(Equiv. 0.157 in.)
Single Row Ball Bearings - 4x9x4 mm Unflanged - Stainless Steel AISI 440C - Phenolic Retainer Bearing
Material: Stainless Steel AISI 440C - Phenolic Retainer    Precision Grade: P5P   
Category: Bearings - Single Row Ball - Unflanged - High Precision
Part Number: S684A-ZZS-MC3-GR5-KC-L23 (PK-20)
Out of Stock | Backorder Now | Backorder now for delivery around Sat, Sep 12, 2026
Regular price $1,504.05 AUD
Regular price Sale price $1,504.05 AUD
Priced, Stocked and Sold Per 20 Units
Excludes GST and overseas Taxes & Duties
Quantity Required

Backorder: Out of Stock.
Single Row Ball Bearings - 4x9x4 mm Unflanged - Stainless Steel AISI 440C Bearing
ID (d)
4.000
mm
+ 0.000 / - 0.0075
(Equiv. 0.157 in.)
O.D. (D)
9.000
mm
+ 0.000 / - 0.0075
(Equiv. 0.354 in.)
Width (B)
4.000
mm
+ 0.000 / - 0.125
(Equiv. 0.157 in.)
Single Row Ball Bearings - 4x9x4 mm - Stainless Steel AISI 440C
Material: Stainless Steel AISI 440C    Precision Grade: Abec 1   
Category: Bearings - Single Row Ball - Unflanged - Precision
Double shielded standard stainless steel bearing
Part Number: S684A-ZZ-MC3 (Each)
150 Available Now | Further orders can be expected around Thu, Aug 20, 2026
Regular price $3.77 AUD
Regular price Sale price $3.77 AUD
Each
Excludes GST and overseas Taxes & Duties
Quantity Required

Larger quantities than the 150 available can be backordered.
Single Row Ball Bearings - 4x9x4 mm Unflanged - Stainless Steel AISI 440C Bearing
ID (d)
4.000
mm
+ 0.000 / - 0.0075
(Equiv. 0.157 in.)
O.D. (D)
9.000
mm
+ 0.000 / - 0.0075
(Equiv. 0.354 in.)
Width (B)
4.000
mm
+ 0.000 / - 0.125
(Equiv. 0.157 in.)
Single Row Ball Bearings - 4x9x4 mm - Stainless Steel AISI 440C
Material: Stainless Steel AISI 440C    Precision Grade: Abec 1   
Category: Bearings - Single Row Ball - Unflanged - Precision
Double shielded standard stainless steel bearing
Part Number: S684A-ZZ-MC3 (Each)
150 Available Now | Further orders can be expected around Thu, Aug 20, 2026
Regular price $3.77 AUD
Regular price Sale price $3.77 AUD
Each
Excludes GST and overseas Taxes & Duties
Quantity Required

150 Available Now. Backorder if more than 150.
Single Row Ball Bearings - 4x9x4 mm Unflanged - Stainless Steel AISI 440C - Ribbon Retainer Low Torque Bearing
ID (d)
4.000
mm
+ 0.000 / - 0.004
(Equiv. 0.157 in.)
O.D. (D)
9.000
mm
+ 0.000 / - 0.005
(Equiv. 0.354 in.)
Width (B)
4.000
mm
+ 0.000 / - 0.040
(Equiv. 0.157 in.)
Single Row Ball Bearings - 4x9x4 mm - Stainless Steel AISI 440C - Ribbon Retainer Low Torque
Material: Stainless Steel AISI 440C - Ribbon Retainer Low Torque    Precision Grade: Abec 7   
Category: Bearings - Single Row Ball - Unflanged - High Precision
Double shielded Abec 7 precision stainless steel bearing with low-torque ribbon retainer. Band around OD is a manufacturers precision marker.
Part Number: S684A-ZZS-MC34-GR7-R-G48 (Each)
2 Available Now | Further orders can be expected around Thu, Aug 27, 2026
Regular price $47.05 AUD
Regular price Sale price $47.05 AUD
Each
Excludes GST and overseas Taxes & Duties
Quantity Required

Larger quantities than the 2 available can be backordered.
Single Row Ball Bearings - 4x9x4 mm Unflanged - Stainless Steel AISI 440C - Ribbon Retainer Low Torque Bearing
ID (d)
4.000
mm
+ 0.000 / - 0.004
(Equiv. 0.157 in.)
O.D. (D)
9.000
mm
+ 0.000 / - 0.005
(Equiv. 0.354 in.)
Width (B)
4.000
mm
+ 0.000 / - 0.040
(Equiv. 0.157 in.)
Single Row Ball Bearings - 4x9x4 mm - Stainless Steel AISI 440C - Ribbon Retainer Low Torque
Material: Stainless Steel AISI 440C - Ribbon Retainer Low Torque    Precision Grade: Abec 7   
Category: Bearings - Single Row Ball - Unflanged - High Precision
Double shielded Abec 7 precision stainless steel bearing with low-torque ribbon retainer. Band around OD is a manufacturers precision marker.
Part Number: S684A-ZZS-MC34-GR7-R-G48 (Each)
2 Available Now | Further orders can be expected around Thu, Aug 27, 2026
Regular price $47.05 AUD
Regular price Sale price $47.05 AUD
Each
Excludes GST and overseas Taxes & Duties
Quantity Required

2 Available Now. Backorder if more than 2.
Single Row Ball Bearings - 4x9x4 mm Unflanged - Stainless Steel AISI 440C Bearing
ID (d)
4.000
mm
O.D. (D)
9.000
mm
Width (B)
4.000
mm
Single Row Ball Bearings - 4x9x4 mm - Stainless Steel AISI 440C
Material: Stainless Steel AISI 440C    Precision Grade: Economy   
Category: Bearings - Single Row Ball - Unflanged - Precision
Part Number: S684A-ZZS-ECO (Each)
90 Available Now | Further orders can be expected around Fri, Aug 14, 2026
Regular price $3.77 AUD
Regular price Sale price $3.77 AUD
Each
Excludes GST and overseas Taxes & Duties
Quantity Required

Larger quantities than the 90 available can be backordered.
Single Row Ball Bearings - 4x9x4 mm Unflanged - Stainless Steel AISI 440C Bearing
ID (d)
4.000
mm
O.D. (D)
9.000
mm
Width (B)
4.000
mm
Single Row Ball Bearings - 4x9x4 mm - Stainless Steel AISI 440C
Material: Stainless Steel AISI 440C    Precision Grade: Economy   
Category: Bearings - Single Row Ball - Unflanged - Precision
Part Number: S684A-ZZS-ECO (Each)
90 Available Now | Further orders can be expected around Fri, Aug 14, 2026
Regular price $3.77 AUD
Regular price Sale price $3.77 AUD
Each
Excludes GST and overseas Taxes & Duties
Quantity Required

90 Available Now. Backorder if more than 90.
Single Row Ball Bearings - 4x9x4 mm Unflanged - Stainless Steel AISI 440C - Ribbon Retainer Low Torque Bearing
ID (d)
4.000
mm
+ 0.000 / - 0.005
(Equiv. 0.157 in.)
O.D. (D)
9.000
mm
+ 0.000 / - 0.005
(Equiv. 0.354 in.)
Width (B)
4.000
mm
+ 0.000 / - 0.040
(Equiv. 0.157 in.)
Single Row Ball Bearings - 4x9x4 mm - Stainless Steel AISI 440C - Ribbon Retainer Low Torque
Material: Stainless Steel AISI 440C - Ribbon Retainer Low Torque    Precision Grade: Abec 5   
Category: Bearings - Single Row Ball - Unflanged - High Precision
Part Number: S684A-ZZS-MC34-GR5-R-G48 (PK-22)
Out of Stock | Backorder Now | Backorder now for delivery around Sat, Sep 12, 2026
Regular price $1,142.41 AUD
Regular price Sale price $1,142.41 AUD
Priced, Stocked and Sold Per 22 Units
Excludes GST and overseas Taxes & Duties
Quantity Required

Backorder: Out of Stock.
Single Row Ball Bearings - 4x9x4 mm Unflanged - Stainless Steel AISI 440C - Ribbon Retainer Low Torque Bearing
ID (d)
4.000
mm
+ 0.000 / - 0.005
(Equiv. 0.157 in.)
O.D. (D)
9.000
mm
+ 0.000 / - 0.005
(Equiv. 0.354 in.)
Width (B)
4.000
mm
+ 0.000 / - 0.040
(Equiv. 0.157 in.)
Single Row Ball Bearings - 4x9x4 mm - Stainless Steel AISI 440C - Ribbon Retainer Low Torque
Material: Stainless Steel AISI 440C - Ribbon Retainer Low Torque    Precision Grade: Abec 5   
Category: Bearings - Single Row Ball - Unflanged - High Precision
Part Number: S684A-ZZS-MC34-GR5-R-G48 (PK-22)
Out of Stock | Backorder Now | Backorder now for delivery around Sat, Sep 12, 2026
Regular price $1,142.41 AUD
Regular price Sale price $1,142.41 AUD
Priced, Stocked and Sold Per 22 Units
Excludes GST and overseas Taxes & Duties
Quantity Required

Backorder: Out of Stock.
Single Row Ball Bearings - 4x9x4 mm Unflanged - Stainless Steel AISI 440C Bearing
ID (d)
4.000
mm
+ 0.000 / - 0.007
(Equiv. 0.157 in.)
O.D. (D)
9.000
mm
+ 0.000 / - 0.007
(Equiv. 0.354 in.)
Width (B)
4.000
mm
+ 0.000 / - 0.120
(Equiv. 0.157 in.)
Single Row Ball Bearings - 4x9x4 mm - Stainless Steel AISI 440C
Material: Stainless Steel AISI 440C    Precision Grade: P6   
Category: Bearings - Single Row Ball - Unflanged - Precision
Double shielded P6 precision stainless steel bearing
Part Number: S684A-ZZ-MC3-JP6 (Each)
4 Available Now | Further orders can be expected around Thu, Aug 20, 2026
Regular price $4.86 AUD
Regular price Sale price $4.86 AUD
Each
Excludes GST and overseas Taxes & Duties
Quantity Required

Larger quantities than the 4 available can be backordered.
Single Row Ball Bearings - 4x9x4 mm Unflanged - Stainless Steel AISI 440C Bearing
ID (d)
4.000
mm
+ 0.000 / - 0.007
(Equiv. 0.157 in.)
O.D. (D)
9.000
mm
+ 0.000 / - 0.007
(Equiv. 0.354 in.)
Width (B)
4.000
mm
+ 0.000 / - 0.120
(Equiv. 0.157 in.)
Single Row Ball Bearings - 4x9x4 mm - Stainless Steel AISI 440C
Material: Stainless Steel AISI 440C    Precision Grade: P6   
Category: Bearings - Single Row Ball - Unflanged - Precision
Double shielded P6 precision stainless steel bearing
Part Number: S684A-ZZ-MC3-JP6 (Each)
4 Available Now | Further orders can be expected around Thu, Aug 20, 2026
Regular price $4.86 AUD
Regular price Sale price $4.86 AUD
Each
Excludes GST and overseas Taxes & Duties
Quantity Required

4 Available Now. Backorder if more than 4.
Single Row Ball Bearings - 4x9x4 mm Unflanged - Chrome Steel SAE 52100 Bearing
ID (d)
4.000
mm
+ 0.000 / - 0.0075
(Equiv. 0.157 in.)
O.D. (D)
9.000
mm
+ 0.000 / - 0.0075
(Equiv. 0.354 in.)
Width (B)
4.000
mm
+ 0.000 / - 0.125
(Equiv. 0.157 in.)
Single Row Ball Bearings - 4x9x4 mm - Chrome Steel SAE 52100
Material: Chrome Steel SAE 52100    Precision Grade: Abec 1   
Category: Bearings - Single Row Ball - Unflanged - Precision
Part Number: 684A-2RS-MC3 (Each)
173 Available Now | Further orders can be expected around Thu, Aug 20, 2026
Regular price $5.41 AUD
Regular price Sale price $5.41 AUD
Each
Excludes GST and overseas Taxes & Duties
Quantity Required

Larger quantities than the 173 available can be backordered.
Single Row Ball Bearings - 4x9x4 mm Unflanged - Chrome Steel SAE 52100 Bearing
ID (d)
4.000
mm
+ 0.000 / - 0.0075
(Equiv. 0.157 in.)
O.D. (D)
9.000
mm
+ 0.000 / - 0.0075
(Equiv. 0.354 in.)
Width (B)
4.000
mm
+ 0.000 / - 0.125
(Equiv. 0.157 in.)
Single Row Ball Bearings - 4x9x4 mm - Chrome Steel SAE 52100
Material: Chrome Steel SAE 52100    Precision Grade: Abec 1   
Category: Bearings - Single Row Ball - Unflanged - Precision
Part Number: 684A-2RS-MC3 (Each)
173 Available Now | Further orders can be expected around Thu, Aug 20, 2026
Regular price $5.41 AUD
Regular price Sale price $5.41 AUD
Each
Excludes GST and overseas Taxes & Duties
Quantity Required

173 Available Now. Backorder if more than 173.
Single Row Ball Bearings - 4x9x4 mm Unflanged - Chrome Steel SAE 52100 Bearing
ID (d)
4.000
mm
+ 0.000 / - 0.0075
(Equiv. 0.157 in.)
O.D. (D)
9.000
mm
+ 0.000 / - 0.0075
(Equiv. 0.354 in.)
Width (B)
4.000
mm
+ 0.000 / - 0.125
(Equiv. 0.157 in.)
Single Row Ball Bearings - 4x9x4 mm - Chrome Steel SAE 52100
Material: Chrome Steel SAE 52100    Precision Grade: Abec 1   
Category: Bearings - Single Row Ball - Unflanged - Precision
Double shielded standard bearing
Part Number: 684A-ZZ-MC3 (PK-2)
32 units (64 pcs) Available Now | Further orders can be expected around Thu, Aug 20, 2026
Regular price $5.86 AUD
Regular price Sale price $5.86 AUD
Priced, Stocked and Sold Per 2 Units
Excludes GST and overseas Taxes & Duties
Quantity Required

Larger quantities than the 32 available can be backordered.
Single Row Ball Bearings - 4x9x4 mm Unflanged - Chrome Steel SAE 52100 Bearing
ID (d)
4.000
mm
+ 0.000 / - 0.0075
(Equiv. 0.157 in.)
O.D. (D)
9.000
mm
+ 0.000 / - 0.0075
(Equiv. 0.354 in.)
Width (B)
4.000
mm
+ 0.000 / - 0.125
(Equiv. 0.157 in.)
Single Row Ball Bearings - 4x9x4 mm - Chrome Steel SAE 52100
Material: Chrome Steel SAE 52100    Precision Grade: Abec 1   
Category: Bearings - Single Row Ball - Unflanged - Precision
Double shielded standard bearing
Part Number: 684A-ZZ-MC3 (PK-2)
32 units (64 pcs) Available Now | Further orders can be expected around Thu, Aug 20, 2026
Regular price $5.86 AUD
Regular price Sale price $5.86 AUD
Priced, Stocked and Sold Per 2 Units
Excludes GST and overseas Taxes & Duties
Quantity Required

32 units (64 pcs) Available Now. Backorder if more than 32.
Single Row Ball Bearings - 4x9x4 mm Unflanged - Chrome Steel SAE 52100 Bearing
ID (d)
4.000
mm
O.D. (D)
9.000
mm
Width (B)
4.000
mm
Single Row Ball Bearings - 4x9x4 mm - Chrome Steel SAE 52100
Material: Chrome Steel SAE 52100    Precision Grade: Economy   
Category: Bearings - Single Row Ball - Unflanged - Precision
Deleted Item. Available while stocks last.
Part Number: 684A-ZZS-ECO (PK-5)
4 units (20 pcs) Available Now | Item Discontinued - Up to 4 may be ordered online. No backorders. Please contact us if you need a larger quantity
Regular price $3.49 AUD
Regular price $4.19 AUD Sale price $3.49 AUD
Priced, Stocked and Sold Per 5 Units
Excludes GST and overseas Taxes & Duties
Quantity Required

4 units (20 pcs) Available Now. These are priced to quit. Please contact us for a quote if you require more.
Single Row Ball Bearings - 4x9x4 mm Unflanged - Chrome Steel SAE 52100 Bearing
ID (d)
4.000
mm
O.D. (D)
9.000
mm
Width (B)
4.000
mm
Single Row Ball Bearings - 4x9x4 mm - Chrome Steel SAE 52100
Material: Chrome Steel SAE 52100    Precision Grade: Economy   
Category: Bearings - Single Row Ball - Unflanged - Precision
Deleted Item. Available while stocks last.
Part Number: 684A-ZZS-ECO (PK-5)
4 units (20 pcs) Available Now | Item Discontinued - Up to 4 may be ordered online. No backorders. Please contact us if you need a larger quantity
Regular price $3.49 AUD
Regular price $4.19 AUD Sale price $3.49 AUD
Priced, Stocked and Sold Per 5 Units
Excludes GST and overseas Taxes & Duties
Quantity Required

4 units (20 pcs) Available Now. These are priced to quit. Please contact us for a quote if you require more.
Single Row Ball Bearings - 4x9x4 mm Unflanged - Chrome Steel SAE 52100 Bearing
ID (d)
4.000
mm
O.D. (D)
9.000
mm
Width (B)
4.000
mm
Single Row Ball Bearings - 4x9x4 mm - Chrome Steel SAE 52100
Material: Chrome Steel SAE 52100    Precision Grade: Economy   
Category: Bearings - Single Row Ball - Unflanged - Precision
Part Number: 684A-2RB-ECO (Each)
750 Available Now | Further orders can be expected around Fri, Aug 14, 2026
Regular price $1.86 AUD
Regular price Sale price $1.86 AUD
Each
Excludes GST and overseas Taxes & Duties
Quantity Required

Larger quantities than the 750 available can be backordered.
Single Row Ball Bearings - 4x9x4 mm Unflanged - Chrome Steel SAE 52100 Bearing
ID (d)
4.000
mm
O.D. (D)
9.000
mm
Width (B)
4.000
mm
Single Row Ball Bearings - 4x9x4 mm - Chrome Steel SAE 52100
Material: Chrome Steel SAE 52100    Precision Grade: Economy   
Category: Bearings - Single Row Ball - Unflanged - Precision
Part Number: 684A-2RB-ECO (Each)
750 Available Now | Further orders can be expected around Fri, Aug 14, 2026
Regular price $1.86 AUD
Regular price Sale price $1.86 AUD
Each
Excludes GST and overseas Taxes & Duties
Quantity Required

750 Available Now. Backorder if more than 750.
Single Row Ball Bearings - 4x9x4 mm Unflanged - Stainless Steel AISI 440C Bearing
ID (d)
4.000
mm
+ 0.000 / - 0.0075
(Equiv. 0.157 in.)
O.D. (D)
9.000
mm
+ 0.000 / - 0.0075
(Equiv. 0.354 in.)
Width (B)
4.000
mm
+ 0.000 / - 0.125
(Equiv. 0.157 in.)
Single Row Ball Bearings - 4x9x4 mm - Stainless Steel AISI 440C
Material: Stainless Steel AISI 440C    Precision Grade: Abec 1   
Category: Bearings - Single Row Ball - Unflanged - Precision
Part Number: S684A-ZZ-MC3-DRY (PK-100)
Contact Us | Special Order Only - Please contact us if you need a large quantity
Single Row Ball Bearings - 4x9x4 mm Unflanged - Stainless Steel AISI 440C Bearing
ID (d)
4.000
mm
+ 0.000 / - 0.0075
(Equiv. 0.157 in.)
O.D. (D)
9.000
mm
+ 0.000 / - 0.0075
(Equiv. 0.354 in.)
Width (B)
4.000
mm
+ 0.000 / - 0.125
(Equiv. 0.157 in.)
Single Row Ball Bearings - 4x9x4 mm - Stainless Steel AISI 440C
Material: Stainless Steel AISI 440C    Precision Grade: Abec 1   
Category: Bearings - Single Row Ball - Unflanged - Precision
Part Number: S684A-ZZ-MC3-DRY (PK-100)
Contact Us | Special Order Only - Please contact us if you need a large quantity | Backorder now for delivery around Wed, Apr 11, 2029