d - 4 mm

D - 8 mm

B - 3 mm

C - 3 mm

d1 - 5 mm

d2 - – mm

r1 min. - 4,8 mm

r2 min. - 4,8 mm

D1 - 7,4 mm

D2 - 0,1 mm

da min. - 4,9 mm

Da max. - 7,5 mm

ra max. - 0,1 mm

Weight - 0,0005 Kg

Basic dynamic load rating (C) - 0,225 kN

Basic static load rating (C0) - 0,072 kN

Fatigue load limit (Pu) - 0,003

Reference speed - 150000 r/min

Limiting speed - 75000 r/min

Calculation factor (f0) - 7,2

Calculation factor (kr) - 0,02

• Model Number: W637/4X-2Z
• Inner Diameter：4mm Outer Diameter：8mm Width：3mm
• Type：Deep Groove Ball Bearings
• Update date：2025-12-17
• Application:Rolling mill gear box,impression material,industrial fans,power tools,nail products,Water Monitoring,security equipment,survey accessories,meat products machine,extruder,sawing machine
• Similar models:NSK 637ZZ1 AST 637HZZ SKF W637/8-2ZS ISB SS637/3-ZZ SKF W637/8-2Z SKF W637-2RS1 ISO 637ZZ SKF W637/8XR NSK 637 ISO 637
• BEARING POWER International Trading Co.,Ltd. specialize in W637/4X-2Z products，there is large inventory of SKF W637/4X-2Z . We has been built up long-term cooperation with SKF company, could make a bulk order of the W637/4X-2Z Which SKF W637/4X-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.

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  51230 M	150	215	50	ISB	Thrust Ball Bearings
  6306-RZ	72	30	19	SKF	Deep Groove Ball Bearings
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  K19x23x17	19	23		SKF	Needle Roller Bearings
  KT 253017	25	30		IKO	Needle Roller Bearings
  N 418	90	191.5	54	NACHI	Cylindrical Roller Bearings
  NK19/16	19	27	16	KOYO	Needle Roller Bearings
  NNCF48/530-V	530	615	118	NKE	Cylindrical Roller Bearings
  SI 30 C	30	47	22	ISB	Plain Bearings
  ST5487-N	54	87	23,5	KOYO	Tapered Roller Bearings
  UC214-42	66,675	125	74,6	FAG	Deep Groove Ball Bearings
  UV30-6	30	57,5	21	NSK	Cylindrical Roller Bearings
  81215			11.0	INA	THRUST ROLLER BEARINGS
  KB50-AJ	50	75	100	NB	LINEAR RECIRCULATING BALL BEARINGS
  NNCF-5022V	110	170	80	CONSOLIDATED	CYLINDRICAL ROLLER BEARINGS
  QJ-1230	150	270	54	CONSOLIDATED	ANGULAR CONTACT BALL BEARINGS WITH SPLIT INNER RACE