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Central Surplus Bearing Finder
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KYK 638-2Z miniature deep groove ball bearing, 8 mm bore, 28 mm OD, 9 mm wide, metal shields both sides, marked 638ZZ. Five pieces per listing.
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| MFR / Brand | KYK |
|---|---|
| MPN | 638-2Z |
| Model | 638ZZ |
| Bearing Type | Deep Groove Ball Bearing |
| ID | 8 mm |
| OD | 28 mm |
| Width | 9 mm |
| Base Number | 638 |
|---|---|
| Industry Terms | miniature ball bearing, deep groove ball bearing, shielded bearing, 2Z bearing |
| Overall Width | 9 mm |
| Mpn Variants | 638-2Z, 638ZZ, 638-ZZ, 638 ZZ, 638Z |
| Material | Chrome Steel |
| Series | 63 |
| Rolling Elements | Ball |
| Number Of Rows | 1 |
| Bore Type | Straight |
| Lubricant | Grease |
| Cross Reference 1 | SKF 638-2Z |
|---|---|
| Cross Reference 2 | FAG 638-2Z |
| Cross Reference 3 | NSK 638ZZ |
| Cross Reference 4 | NTN 638ZZ |
The KYK 638-2Z is a single-row miniature deep groove ball bearing in the ISO 638 size: 8 mm bore, 28 mm outside diameter, 9 mm width. A pressed metal shield on each side retains the factory grease and keeps debris out of the raceway. The shields are stamped KYK JAPAN 638ZZ.
6 — single-row deep groove ball bearing.
3 — dimension series 3, the heavier section for an 8 mm bore: 28 mm OD and 9 mm width.
8 — bore code, 8 mm bore.
2Z / ZZ — metal shield on both sides.
Bore Diameter: 8 mm. Outside Diameter: 28 mm. Overall Width: 9 mm. Rolling Elements: Ball. Number Of Rows: 1. Closure Type: Shields both sides. Lubricant: Grease. Bore Type: Straight. Series: 63. Unit Quantity: 5 Pcs.
The 8 mm straight bore mounts on an 8 mm shaft and the 28 mm outer ring fits a 28 mm housing bore. Width: 9 mm.
Interchanges with SKF 638-2Z, FAG 638-2Z, NSK 638ZZ and NTN 638ZZ. Also marked 638ZZ and 638-ZZ.
What size is a 638ZZ bearing?
8 mm bore, 28 mm outside diameter and 9 mm width.
Is 638-2Z the same as 638ZZ?
Yes. Both designations mean metal shields on both sides of the 638 bearing.
How many bearings come in this listing?
Five KYK 638-2Z bearings.
Rockwell’s own product page for the Kinetix 6000 is down
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