| Dimensions (metric) | d | 4 | ![]() Two Shields ZZ |
| D | 9 | ||
| B | 4 | ||
| Approx. Wgt. lbs | .0030 | ||
| Interchange | ADR | - | |
| ISC | 684hZZS | ||
| NMB | SSL-940ZZ | ||
| NTN | FW684ZZA | ||
| RMB | - | ||
| SKF | W638/4-ZZ | ||
| 1) Outer races, inner races and balls are manufactured from 440C or equivalent stainless steel. They are through hardened to a hardness of 55-57RC. 2) The cages are manufactured from 304 or equivalent stainless steel. 3) Shields are manufactured from 304 or equivalent stainless steel. | |||
Hot number:SKF NK 68/25 SKF 51172 TIMKEN 48282/48220DC OKB 42240 OKB 7338E OKB 9039248 Timken 305KG ISO K30x37x16 Samick LMEKP25L ISO NNU4940 CX NU39/1060 ISB RB 20030 SKF W 61703 RIV MS-121/2 SKF NU 238 ECML
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