d - 4 mm

D - 9 mm

B - 4 mm

C - 4 mm

d1 - 5,2 mm

d2 - – mm

r1 min. - 4,8 mm

r2 min. - 4,8 mm

D1 - 8,1 mm

D2 - 0,1 mm

da min. - 5,1 mm

Da max. - 8,2 mm

ra max. - 0,1 mm

Weight - 0,0009 Kg

Basic dynamic load rating (C) - 0,364 kN

Basic static load rating (C0) - 0,114 kN

Fatigue load limit (Pu) - 0,005

Reference speed - 140000 r/min

Limiting speed - 70000 r/min

Calculation factor (f0) - 6,5

Calculation factor (kr) - 0,02

• Model Number:W638/4-2Z
• Inner Diameter：4mm Outer Diameter：9mm Width：4mm
• Type：Deep Groove Ball Bearings
• Update date：2025-12-12
• Application:Air,filter paper products,garbage disposal,Roller mill,hydraulic pump,suction nozzle,Textile Industry Accessories and Accessories,building decoration raw materials and accessories,casting embedding,DC generators,pump accessories
• Similar models:SKF W63804-2Z SKF W63801-2RZ SKF W63800-2RZ ISB 638-RZ SKF W63805-2RZ SKF 638/8-2Z SKF W63805R-2Z ISO 63800ZZ CX 63800ZZ ZEN 63801
• BEARING POWER International Trading Co.,Ltd. specialize in W638/4-2Z products，there is large inventory of SKF W638/4-2Z . We has been built up long-term cooperation with SKF company, could make a bulk order of the W638/4-2Z Which SKF W638/4-2Z 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.

• Model No.	Inner Diameter	Outer Diameter	Width	Brand	Type
  2796/2733	34,925	75,2602	23,8125	AST	Tapered Roller Bearings
  32352	260	540	176	NACHI	Tapered Roller Bearings
  6202/HR22T2	15	35	11	SKF	Deep Groove Ball Bearings
  AST50 WC16IB	25,4			AST	Plain Bearings
  BK1616	16	22	16	KOYO	Needle Roller Bearings
  BT4B 334141 G/HA1VA901	901,7	635	654,05	SKF	Tapered Roller Bearings
  GK40X45X43.8	40,000	45,000		NTN	Needle Roller Bearings
  HM921343/HM921310D+HM921343XA	89,916	189,967	85,852	Timken	Tapered Roller Bearings
  KJM822049-JM822010	110	165	35	FAG	Tapered Roller Bearings
  RNA4902	20	28	13	Timken	Needle Roller Bearings
  SYR 2 3/4 N	69,85	68,262	65,484	SKF	Bearing Units
  UCPH207-20	31,75		42,9	FYH	Bearing Units
  NN3018ASK.M.SP	90	140	37	FAG	CYLINDRICAL ROLLER BEARINGS
  30210A	50	90	20	FAG	TAPERED ROLLER BEARINGS
  NN3019KTN9SPW33	95	145	37	SKF	CYLINDRICAL ROLLER BEARINGS
  803027	90	160	48	FAG (Old No.)	SPHERICAL ROLLER BEARINGS
  J402464	1.2500	2.0000	2.0000	Bower	JOURNAL ROLLER ASSEMBLIES
  FR1810ZZS	.3125	.5000	.1562	ISC	DEEP GROOVE BALL BEARINGS
  4M	25	62	12	MRC	DEEP GROOVE BALL BEARINGS
  6304.2RS	20	52	15	SKF	DEEP GROOVE BALL BEARINGS