d - 8 mm

D - 28 mm

B - 9 mm

C - 9 mm

r min. - 0,3 mm

r1 min. - 0,3 mm

da min. - 10 mm

Da max. - 26 mm

ra max. - 0,3 mm

Weight - 0,029 Kg

Basic dynamic load rating (C) - 4,55 kN

Basic static load rating (C0) - 1,95 kN

(Grease) Lubrication Speed - 26000 r/min

(Oil) Lubrication Speed - 32000 r/min

Calculation factor (f0) - 12,3

• Model Number:638
• Inner Diameter：8mm Outer Diameter：28mm Width：9mm
• Type：Deep Groove Ball Bearings
• Update date：2025-12-16
• Application:engine,mobile toilet,Pneumatic Control Elements,shaft milling machine,Chromatography Products,other lathe,stirrer,car shock absorber,Cylinder Special,shoe-making machinery,Technical Equipment
• Similar models:CX 63802 ZEN 63802 ZEN 638 SKF W63802R-2Z ISB SS638/3-ZZ SKF W63805-2Z ISB 638/5-ZZ ISB 63803-ZZ SKF W638 ISO 63802
• BEARING POWER International Trading Co.,Ltd. specialize in 638 products，there is large inventory of KOYO 638 . We has been built up long-term cooperation with KOYO company, could make a bulk order of the 638 Which KOYO 638 is the most authentic, must choose BEARING POWER, what a whole variety, reasonable price, guaranteed quality, prompt delivery via Global express.Any inquiry, never hesitate to E-mail or call +86-022-58519721 to contact us.

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  6944-Z	220	300	38	CYSD	Deep Groove Ball Bearings
  7910UADG/G8UP-5	50	72	12	NTN	Angular Contact Ball Bearings
  AC-6003LLU	17	35	10	NTN	Deep Groove Ball Bearings
  BSA 203 C	17	40	12	SKF	Thrust Ball Bearings
  NCF2984 V	420	560	82	ISO	Cylindrical Roller Bearings
  NJ356-E-M1	280	580		FAG	Cylindrical Roller Bearings
  NUPK2205S14NC3	25	52	20	NACHI	Cylindrical Roller Bearings
  TUP2 170.80	170	175		CX	Plain Bearings
  20217	85	150	28	FAG	SPHERICAL ROLLER BEARINGS
  1009	45	95	47	INA	THRUST BALL BEARINGS
  RLS25	7.0000	12.0000	1.7500	FAG	CYLINDRICAL ROLLER BEARINGS
  22322EJA/VA405	110	240	80	SKF	SPHERICAL ROLLER BEARINGS
  306-SZZ	30	72	19	MRC	DEEP GROOVE BALL BEARINGS
  140536	.8750	1.5000	2.2500	Rollway	JOURNAL ROLLER ASSEMBLIES
  8SF14	.8750	1.4375	.7656	Torrington	SPHERICAL PLAIN BEARINGS
  0610-060-00	60	90	125	STAR	LINEAR RECIRCULATING BALL BEARINGS
  NNTR-120-2RSX	120	290	135	CONSOLIDATED	YOKE TYPE TRACK ROLLER