d - 4 mm

D - 8 mm

B - 3 mm

d₁ - - 5 mm

D₂ - - 7.4 mm

D₃ - 9.2 mm

C - 0.6 mm

r_1,2 - min. - 0.1 mm

d_a - min. - 4.8 mm

r_a - max. - 0.1 mm

Basic dynamic load rating - C - 0.225 kN

Basic static load rating - C₀ - 0.072 kN

Fatigue load limit - P_u - 0.003 kN

Reference speed - 150000 r/min

Limiting speed - 75000 r/min

Calculation factor - k_r - 0.02

Calculation factor - f₀ - 7.2

Mass bearing - 0.0006 kg

• Model Number:W 637/4 XR-2Z
• Inner Diameter：8mm Outer Diameter：4mm Width：3mm
• Type：Deep Groove Ball Bearings
• Update date：2025-12-11
• Application:forklift industry,fabric products,Hydraulic Equipment,lifting tackle,office outdoor camping equipment,quality inspection equipment,other CNC,Insect Count,textile machinery,water protection,medical equipment
• Similar models:SKF W637/5X-2ZS NSK 637DD SKF W637/8-2Z ISB SS637/3 SKF W637/8X SKF W637/2-2Z ISO 637ZZ SKF W637/8R-2ZS SKF W637/5XR-2ZS SKF W637/4XR
• BEARING POWER International Trading Co.,Ltd. specialize in W637/4XR-2Z products，there is large inventory of SKF W 637/4 XR-2Z . We has been built up long-term cooperation with SKF company, could make a bulk order of the W 637/4 XR-2Z Which SKF W637/4XR-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
  1213K	65,000	120,000	23,000	SNR	Self-Aligning Ball Bearings
  16005	25	47	8	CRAFT	Deep Groove Ball Bearings
  22236-MB-W33	180	320	86	NKE	Spherical Roller Bearings
  2LA-HSE914G/GNP42	70	100	16	NTN	Angular Contact Ball Bearings
  438/432B	44,45	95,25	29,9	Timken	Tapered Roller Bearings
  51180-FP	400	480	65	NKE	Thrust Ball Bearings
  7334 BCBM	360	170	72	SKF	Angular Contact Ball Bearings
  F699	9	20	6	FBJ	Deep Groove Ball Bearings
  RTC395	395	525	20	INA	Complex Bearings
  SA18T/K	18			CRAFT	Plain Bearings
  SIJK18C	18			LS	Plain Bearings
  UCTU315-700	75		82	KOYO	Bearing Units
  NUP2080E	400	600	118	FAG	CYLINDRICAL ROLLER BEARINGS
  NU2338	190	400	132	FAG	CYLINDRICAL ROLLER BEARINGS
  4461	5.8750	8.6250		INA	THRUST BALL BEARINGS
  5210A-2ZNR	50	90	30.2	SKF	DOUBLE ROW ANGULAR CONTACT BALL BEARINGS
  6328-R	140	300	62	CONSOLIDATED	ANGULAR CONTACT BALL BEARINGS
  FT-23	1.8750	3.2187		CONSOLIDATED	THRUST BALL BEARINGS
  2005	.7500	1.2500		CONSOLIDATED	THRUST BALL BEARINGS
  SDAF-317	3.9375	3.1875		CONSOLIDATED	PILLOW BLOCKS