W Series Stainless Steel Miniature Bearings

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W Series Stainless Steel Miniature Bearings

The W Series (Miniature Plain) caters to precision micro-engineering tasks where a flange is unnecessary. These stainless steel bearings provide high-speed capabilities and corrosion resistance in a small imperial package. They are commonly found in precision sensors, micro-actuators, and high-end consumer electronics.

Bore diameter
1 mm 1.5 mm 2 mm 2.5 mm 3 mm 4 mm 5 mm 6 mm 7 mm 8 mm 9 mm
Outside diameter
3 mm 4 mm 5 mm 6 mm 7 mm 8 mm 9 mm 10 mm 11 mm 12 mm 13 mm 14 mm 15 mm 16 mm 17 mm 19 mm 20 mm 22 mm 24 mm 26 mm 28 mm 30 mm
Width
1 mm 1.2 mm 1.5 mm 1.6 mm 1.8 mm 2 mm 2.3 mm 2.5 mm 2.6 mm 2.8 mm 3 mm 3.5 mm 4 mm 5 mm 6 mm 7 mm 8 mm 9 mm 10 mm
Seal type
Open Sealed Shielded
Cage material
Chrome Steel Stainless Steel
Limiting speed
16 X 1000 rpm 19 X 1000 rpm 20 X 1000 rpm 22 X 1000 rpm 24 X 1000 rpm 26 X 1000 rpm 28 X 1000 rpm 30 X 1000 rpm 32 X 1000 rpm 34 X 1000 rpm 36 X 1000 rpm 38 X 1000 rpm 40 X 1000 rpm 43 X 1000 rpm 45 X 1000 rpm 48 X 1000 rpm 50 X 1000 rpm 53 X 1000 rpm 56 X 1000 rpm 60 X 1000 rpm 63 X 1000 rpm 67 X 1000 rpm 70 X 1000 rpm 75 X 1000 rpm 80 X 1000 rpm 85 X 1000 rpm 90 X 1000 rpm 95 X 1000 rpm 100 X 1000 rpm 110 X 1000 rpm 120 X 1000 rpm 130 X 1000 rpm 140 X 1000 rpm 150 X 1000 rpm
Radial dynamic load rating
12 lbf 14 lbf 15 lbf 18 lbf 21 lbf 26 lbf 27 lbf 30 lbf 32 lbf 39 lbf 40 lbf 43 lbf 50 lbf 51 lbf 56 lbf 58 lbf 64 lbf 70 lbf 72 lbf 73 lbf 80 lbf 82 lbf 91 lbf 104 lbf 117 lbf 121 lbf 124 lbf 139 lbf 149 lbf 161 lbf 167 lbf 171 lbf 207 lbf 281 lbf 321 lbf 344 lbf 438 lbf 447 lbf 456 lbf 555 lbf 892 lbf 980 lbf
Radial static load rating
3 lbf 4 lbf 6 lbf 8 lbf 10 lbf 11 lbf 12 lbf 13 lbf 14 lbf 15 lbf 16 lbf 19 lbf 20 lbf 21 lbf 23 lbf 25 lbf 26 lbf 31 lbf 32 lbf 33 lbf 40 lbf 43 lbf 50 lbf 53 lbf 55 lbf 56 lbf 58 lbf 60 lbf 67 lbf 75 lbf 82 lbf 102 lbf 132 lbf 142 lbf 175 lbf 183 lbf 187 lbf 198 lbf 209 lbf 252 lbf 441 lbf 522 lbf
Part Number Bore diameter Outside diameter Width For load direction Seal type Ring material Ball material Radial dynamic load rating Radial static load rating Limiting speed
W 618/1 1 mm 3 mm 1 mm Radial Open Stainless Steel Stainless Steel 12 lbf 3 lbf 150 X 1000 rpm
W 618/4/R799 1 mm 3 mm 1 mm Radial Open Stainless Steel Stainless Steel 12 lbf 3 lbf 150 X 1000 rpm
W 638/1 1 mm 3 mm 1.5 mm Radial Open Stainless Steel Stainless Steel 12 lbf 3 lbf 150 X 1000 rpm
W 619/1 1 mm 4 mm 1.6 mm Radial Open Stainless Steel Stainless Steel 18 lbf 4 lbf 140 X 1000 rpm
W 618/1.5 1.5 mm 4 mm 1.2 mm Radial Open Stainless Steel Stainless Steel 14 lbf 4 lbf 140 X 1000 rpm
W 638/1.5-2Z 1.5 mm 4 mm 2 mm Radial Shielded Stainless Steel Stainless Steel 14 lbf 4 lbf 110 X 1000 rpm
W 619/1.5 1.5 mm 5 mm 2 mm Radial Open Stainless Steel Stainless Steel 30 lbf 8 lbf 120 X 1000 rpm
W 60/1.5 1.5 mm 6 mm 2.5 mm Radial Open Stainless Steel Stainless Steel 43 lbf 11 lbf 110 X 1000 rpm
W 630/1.5-2Z 1.5 mm 6 mm 3 mm Radial Shielded Stainless Steel Stainless Steel 43 lbf 11 lbf 90 X 1000 rpm
W 617/2 2 mm 4 mm 1.2 mm Radial Open Stainless Steel Stainless Steel 15 lbf 4 lbf 130 X 1000 rpm
W 637/2-2Z 2 mm 4 mm 2 mm Radial Shielded Stainless Steel Stainless Steel 15 lbf 4 lbf 100 X 1000 rpm
W 618/2 2 mm 5 mm 1.5 mm Radial Open Stainless Steel Stainless Steel 21 lbf 6 lbf 120 X 1000 rpm
W 618/2 X 2 mm 5 mm 2 mm Radial Open Stainless Steel Stainless Steel 21 lbf 6 lbf 120 X 1000 rpm
W 638/2-2Z 2 mm 5 mm 2.3 mm Radial Shielded Stainless Steel Stainless Steel 21 lbf 6 lbf 100 X 1000 rpm
W 638/2 X-2Z 2 mm 5 mm 2.5 mm Radial Shielded Stainless Steel Stainless Steel 21 lbf 6 lbf 100 X 1000 rpm
W 619/2 2 mm 6 mm 2.3 mm Radial Open Stainless Steel Stainless Steel 43 lbf 11 lbf 110 X 1000 rpm
W 619/2 X 2 mm 6 mm 2.5 mm Radial Open Stainless Steel Stainless Steel 43 lbf 11 lbf 110 X 1000 rpm
W 619/2 X-2Z 2 mm 6 mm 2.5 mm Radial Shielded Stainless Steel Stainless Steel 43 lbf 11 lbf 90 X 1000 rpm
W 639/2-2Z 2 mm 6 mm 3 mm Radial Shielded Stainless Steel Stainless Steel 43 lbf 11 lbf 90 X 1000 rpm
W 602 2 mm 7 mm 2.8 mm Radial Open Stainless Steel Stainless Steel 50 lbf 15 lbf 100 X 1000 rpm
W 602 X-2ZS 2 mm 7 mm 3 mm Radial Shielded Stainless Steel Stainless Steel 50 lbf 15 lbf 80 X 1000 rpm
W 618/2.5 2.5 mm 6 mm 1.8 mm Radial Open Stainless Steel Stainless Steel 26 lbf 8 lbf 110 X 1000 rpm
W 638/2.5-2Z 2.5 mm 6 mm 2.6 mm Radial Shielded Stainless Steel Stainless Steel 26 lbf 8 lbf 85 X 1000 rpm
W 619/2.5 2.5 mm 7 mm 2.5 mm Radial Open Stainless Steel Stainless Steel 50 lbf 15 lbf 100 X 1000 rpm
W 60/2.5 2.5 mm 8 mm 2.8 mm Radial Open Stainless Steel Stainless Steel 70 lbf 20 lbf 95 X 1000 rpm
W 630/2.5-2Z 2.5 mm 8 mm 4 mm Radial Shielded Stainless Steel Stainless Steel 70 lbf 20 lbf 80 X 1000 rpm
W 617/3 3 mm 6 mm 2 mm Radial Open Stainless Steel Stainless Steel 26 lbf 8 lbf 110 X 1000 rpm
W 627/3-2Z 3 mm 6 mm 2.5 mm Radial Shielded Stainless Steel Stainless Steel 26 lbf 8 lbf 85 X 1000 rpm
W 637/3-2Z 3 mm 6 mm 3 mm Radial Shielded Stainless Steel Stainless Steel 26 lbf 8 lbf 85 X 1000 rpm
W 618/3 3 mm 7 mm 2 mm Radial Open Stainless Steel Stainless Steel 40 lbf 13 lbf 100 X 1000 rpm
W 638/3-2RS1 3 mm 7 mm 3 mm Radial Sealed Stainless Steel Stainless Steel 40 lbf 13 lbf 45 X 1000 rpm
W 638/3-2Z 3 mm 7 mm 3 mm Radial Shielded Stainless Steel Stainless Steel 40 lbf 13 lbf 80 X 1000 rpm
W 619/3 3 mm 8 mm 3 mm Radial Open Stainless Steel Stainless Steel 72 lbf 20 lbf 95 X 1000 rpm
W 619/3-2Z 3 mm 8 mm 3 mm Radial Shielded Stainless Steel Stainless Steel 51 lbf 16 lbf 75 X 1000 rpm
W 639/3-2RS1 3 mm 8 mm 4 mm Radial Sealed Stainless Steel Stainless Steel 72 lbf 20 lbf 43 X 1000 rpm
W 639/3-2Z 3 mm 8 mm 4 mm Radial Shielded Stainless Steel Stainless Steel 72 lbf 20 lbf 75 X 1000 rpm
W 603 3 mm 9 mm 3 mm Radial Open Stainless Steel Stainless Steel 73 lbf 21 lbf 90 X 1000 rpm
W 603 X-2Z 3 mm 9 mm 4 mm Radial Shielded Stainless Steel Stainless Steel 73 lbf 21 lbf 70 X 1000 rpm
W 630/3-2Z 3 mm 9 mm 5 mm Radial Shielded Stainless Steel Stainless Steel 73 lbf 21 lbf 70 X 1000 rpm
W 623 3 mm 10 mm 4 mm Radial Open Stainless Steel Stainless Steel 80 lbf 25 lbf 90 X 1000 rpm
W 623-2RS1 3 mm 10 mm 4 mm Radial Sealed Stainless Steel Stainless Steel 80 lbf 25 lbf 40 X 1000 rpm
W 623-2Z 3 mm 10 mm 4 mm Radial Shielded Stainless Steel Stainless Steel 80 lbf 25 lbf 70 X 1000 rpm
W 633 3 mm 13 mm 5 mm Radial Open Stainless Steel Stainless Steel 167 lbf 56 lbf 70 X 1000 rpm
W 633-2RS1 3 mm 13 mm 5 mm Radial Sealed Stainless Steel Stainless Steel 167 lbf 56 lbf 32 X 1000 rpm
W 633-2Z 3 mm 13 mm 5 mm Radial Shielded Stainless Steel Stainless Steel 167 lbf 56 lbf 56 X 1000 rpm
W 617/4 4 mm 7 mm 2 mm Radial Open Stainless Steel Stainless Steel 40 lbf 13 lbf 95 X 1000 rpm
W 627/4-2Z 4 mm 7 mm 2.5 mm Radial Shielded Stainless Steel Stainless Steel 32 lbf 12 lbf 75 X 1000 rpm
W 617/4 X 4 mm 8 mm 2 mm Radial Open Stainless Steel Stainless Steel 51 lbf 16 lbf 90 X 1000 rpm
W 637/4 X-2Z 4 mm 8 mm 3 mm Radial Shielded Stainless Steel Stainless Steel 51 lbf 16 lbf 75 X 1000 rpm
W 618/4 4 mm 9 mm 2.5 mm Radial Open Stainless Steel Stainless Steel 82 lbf 26 lbf 85 X 1000 rpm
W 638/4-2RS1 4 mm 9 mm 4 mm Radial Sealed Stainless Steel Stainless Steel 82 lbf 26 lbf 40 X 1000 rpm
W 638/4-2Z 4 mm 9 mm 4 mm Radial Shielded Stainless Steel Stainless Steel 82 lbf 26 lbf 70 X 1000 rpm
W 637/4 X 4 mm 10 mm 3 mm Radial Open Stainless Steel Stainless Steel 124 lbf 55 lbf 80 X 1000 rpm
W 638/4 X-2RS1 4 mm 10 mm 4 mm Radial Sealed Stainless Steel Stainless Steel 124 lbf 55 lbf 36 X 1000 rpm
W 638/4 X-2Z 4 mm 10 mm 4 mm Radial Shielded Stainless Steel Stainless Steel 124 lbf 55 lbf 63 X 1000 rpm
W 619/4 4 mm 11 mm 4 mm Radial Open Stainless Steel Stainless Steel 121 lbf 40 lbf 80 X 1000 rpm
W 619/4-2RS1 4 mm 11 mm 4 mm Radial Sealed Stainless Steel Stainless Steel 121 lbf 40 lbf 36 X 1000 rpm
W 619/4-2Z 4 mm 11 mm 4 mm Radial Shielded Stainless Steel Stainless Steel 121 lbf 40 lbf 63 X 1000 rpm
W 604 4 mm 12 mm 4 mm Radial Open Stainless Steel Stainless Steel 121 lbf 40 lbf 80 X 1000 rpm
W 604-2RS1 4 mm 12 mm 4 mm Radial Sealed Stainless Steel Stainless Steel 121 lbf 40 lbf 36 X 1000 rpm
W 604-2RS1/W64 4 mm 12 mm 4 mm Radial Sealed Stainless Steel Stainless Steel 121 lbf 40 lbf 80 X 1000 rpm
W 604-2Z 4 mm 12 mm 4 mm Radial Shielded Stainless Steel Stainless Steel 121 lbf 40 lbf 63 X 1000 rpm
W 624-2RS1 4 mm 13 mm 5 mm Radial Sealed Stainless Steel Stainless Steel 167 lbf 56 lbf 32 X 1000 rpm
W 624-2RS1/VT378 4 mm 13 mm 5 mm Radial Sealed Stainless Steel Stainless Steel 167 lbf 56 lbf 32 X 1000 rpm
W 624-2Z 4 mm 13 mm 5 mm Radial Shielded Stainless Steel Stainless Steel 167 lbf 56 lbf 56 X 1000 rpm
W 634 4 mm 16 mm 5 mm Radial Open Stainless Steel Stainless Steel 171 lbf 60 lbf 63 X 1000 rpm
W 634-2RS1 4 mm 16 mm 5 mm Radial Sealed Stainless Steel Stainless Steel 171 lbf 60 lbf 30 X 1000 rpm
W 634-2Z 4 mm 16 mm 5 mm Radial Shielded Stainless Steel Stainless Steel 171 lbf 60 lbf 50 X 1000 rpm
W 617/5 5 mm 8 mm 2 mm Radial Open Stainless Steel Stainless Steel 39 lbf 14 lbf 85 X 1000 rpm
W 627/5-2Z 5 mm 8 mm 2.5 mm Radial Shielded Stainless Steel Stainless Steel 27 lbf 10 lbf 70 X 1000 rpm
W 627/5-2ZS 5 mm 8 mm 2.5 mm Radial Shielded Stainless Steel Stainless Steel 27 lbf 10 lbf 70 X 1000 rpm
W 637/5 X-2Z 5 mm 9 mm 3 mm Radial Shielded Stainless Steel Stainless Steel 56 lbf 19 lbf 67 X 1000 rpm
W 618/5 5 mm 11 mm 3 mm Radial Open Stainless Steel Stainless Steel 91 lbf 32 lbf 75 X 1000 rpm
W 628/5-2RS1 5 mm 11 mm 4 mm Radial Sealed Stainless Steel Stainless Steel 91 lbf 32 lbf 34 X 1000 rpm
W 628/5-2Z 5 mm 11 mm 4 mm Radial Shielded Stainless Steel Stainless Steel 91 lbf 32 lbf 60 X 1000 rpm
W 638/5-2RS1 5 mm 11 mm 5 mm Radial Sealed Stainless Steel Stainless Steel 91 lbf 32 lbf 34 X 1000 rpm
W 638/5-2Z 5 mm 11 mm 5 mm Radial Shielded Stainless Steel Stainless Steel 91 lbf 32 lbf 60 X 1000 rpm
W 619/5 5 mm 13 mm 4 mm Radial Open Stainless Steel Stainless Steel 171 lbf 75 lbf 70 X 1000 rpm
W 619/5-2RS1 5 mm 13 mm 4 mm Radial Sealed Stainless Steel Stainless Steel 171 lbf 75 lbf 32 X 1000 rpm
W 619/5-2Z 5 mm 13 mm 4 mm Radial Shielded Stainless Steel Stainless Steel 171 lbf 75 lbf 56 X 1000 rpm
W 619/5 X-2Z 5 mm 13 mm 5 mm Radial Shielded Stainless Steel Stainless Steel 171 lbf 75 lbf 56 X 1000 rpm
W 605 5 mm 14 mm 5 mm Radial Open Stainless Steel Stainless Steel 171 lbf 58 lbf 67 X 1000 rpm
W 605-2RS1 5 mm 14 mm 5 mm Radial Sealed Stainless Steel Stainless Steel 171 lbf 58 lbf 30 X 1000 rpm
W 605-2Z 5 mm 14 mm 5 mm Radial Shielded Stainless Steel Stainless Steel 171 lbf 58 lbf 53 X 1000 rpm
W 625 5 mm 16 mm 5 mm Radial Open Stainless Steel Stainless Steel 321 lbf 142 lbf 63 X 1000 rpm
W 625/W64 5 mm 16 mm 5 mm Radial Open Stainless Steel Stainless Steel 321 lbf 142 lbf 63 X 1000 rpm
W 625-2RS1 5 mm 16 mm 5 mm Radial Sealed Stainless Steel Stainless Steel 321 lbf 142 lbf 28 X 1000 rpm
W 625-2RS1/VT378 5 mm 16 mm 5 mm Radial Sealed Stainless Steel Stainless Steel 321 lbf 142 lbf 63 X 1000 rpm
W 625-2Z 5 mm 16 mm 5 mm Radial Shielded Stainless Steel Stainless Steel 321 lbf 142 lbf 50 X 1000 rpm
W 625-2Z/VT378 5 mm 16 mm 5 mm Radial Shielded Stainless Steel Stainless Steel 321 lbf 142 lbf 50 X 1000 rpm
W 635-2RS1 5 mm 19 mm 6 mm Radial Sealed Stainless Steel Stainless Steel 456 lbf 198 lbf 24 X 1000 rpm
W 635-2Z 5 mm 19 mm 6 mm Radial Shielded Stainless Steel Stainless Steel 456 lbf 198 lbf 43 X 1000 rpm
W 617/6 6 mm 10 mm 2.5 mm Radial Open Stainless Steel Stainless Steel 64 lbf 25 lbf 75 X 1000 rpm
W 627/6-2Z 6 mm 10 mm 3 mm Radial Shielded Stainless Steel Stainless Steel 64 lbf 25 lbf 60 X 1000 rpm
W 627/6 X 6 mm 12 mm 3 mm Radial Open Stainless Steel Stainless Steel 91 lbf 33 lbf 70 X 1000 rpm
W 618/6 6 mm 13 mm 3.5 mm Radial Open Stainless Steel Stainless Steel 139 lbf 50 lbf 67 X 1000 rpm
W 628/6-2RS1 6 mm 13 mm 5 mm Radial Sealed Stainless Steel Stainless Steel 139 lbf 50 lbf 30 X 1000 rpm
W 628/6-2Z 6 mm 13 mm 5 mm Radial Shielded Stainless Steel Stainless Steel 139 lbf 50 lbf 53 X 1000 rpm
W 619/6 6 mm 15 mm 5 mm Radial Open Stainless Steel Stainless Steel 171 lbf 60 lbf 63 X 1000 rpm
W 619/6-2RS1 6 mm 15 mm 5 mm Radial Sealed Stainless Steel Stainless Steel 171 lbf 60 lbf 30 X 1000 rpm
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