| Old No. | 638/4-ZZ | ![]() Two Shields ZZ | |
| Dimensions (metric) | d | 4 | |
| D | 9 | ||
| B | 4 | ||
| Approx. Wgt. lbs | .0030 | ||
| Interchange | ADR | 638/4ZZ | |
| ISC | 684ZZS | ||
| Nachi | 684ZZ | ||
| NMB | L-940ZZ | ||
| NTN | W684ZZA | ||
| RMB | ULZ409 | ||
| SKF | 638/4ZZ | ||
| 1) Also available with one shield - suffix “Z”. No change in width dimensions. | |||
Hot number:KOYO 23240RK NSK B-96 FAG B71907-E-T-P4S SKF FYWK 1.1/2 YTH KOYO LM742749/LM742714 CX NU424 INA PSHEY35-N SKF S7001 ACD/P4A RHP 51156 McGill CRSBC-22 RHP RM-28 SKF 470371 SKF 7020 ACE/HCP4AH1 SKF 7411 SKF BT4B 331351 E/C775
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