d - 8 mm

D - 28 mm

B - 9 mm

d₂ - - 13.9 mm

D₂ - - 22.38 mm

r_1,2 - min. - 0.3 mm

d_a - min. - 10 mm

d_a - max. - 13.8 mm

D_a - max. - 26 mm

r_a - max. - 0.3 mm

Basic dynamic load rating - C - 4 kN

Basic static load rating - C₀ - 2 kN

Fatigue load limit - P_u - 0.083 kN

Reference speed - 67000 r/min

Limiting speed - 40000 r/min

Calculation factor - k_r - 0.035

Calculation factor - f₀ - 12.4

Mass bearing - 0.0273 kg

• Model Number:W 638
• Inner Diameter：28mm Outer Diameter：8mm Width：9mm
• Type：Deep Groove Ball Bearings
• Update date：2025-12-16
• Application:vacuum suction cup,Internal thread type,Hair styling device,other CNC,Machine tool accessories,Cylinder Special,packaging machinery,tapered grinder,embroidery cloth,security,Plastic molding
• Similar models:SKF W63803-2RZ SKF W63806 ISO 63801ZZ SKF W63803R-2Z ISB F63803ZZ ISO 63803-2RS SKF W638/2-2Z SKF W638/1 CX 63803 SKF W638/8R-2Z
• BEARING POWER International Trading Co.,Ltd. specialize in W638 products，there is large inventory of SKF W 638 . We has been built up long-term cooperation with SKF company, could make a bulk order of the W 638 Which SKF W638 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
  6300-2RS	10	35	11	ISO	Deep Groove Ball Bearings
  6806LLU	30	42	7	NTN	Deep Groove Ball Bearings
  7021AC	105	160	26	AST	Angular Contact Ball Bearings
  71914 ACD/HCP4A	100	70	16	SKF	Angular Contact Ball Bearings
  7205C	25	52	15	CRAFT	Angular Contact Ball Bearings
  7919CDF	95	130	18	CYSD	Angular Contact Ball Bearings
  K 45x50x27	50	45	27	SKF	Cylindrical Roller Bearings
  K45X50X27	45,000	50,000		NTN	Needle Roller Bearings
  KBK 20x24x30	20	24		INA	Needle Roller Bearings
  SL02-4952	260	360	100	NTN	Cylindrical Roller Bearings
  UCFCX17E	85			KOYO	Bearing Units
  307KD	35	80	21	FAF	DEEP GROOVE BALL BEARINGS
  320W	100	215	47	FAF	DEEP GROOVE BALL BEARINGS
  H318.303	90	120		FAG	ADAPTERS
  22612-77	.7500	1.6250	.5000	General	DEEP GROOVE BALL BEARINGS
  N1026KR	130	200	33	NSK	CYLINDRICAL ROLLER BEARINGS
  29417E	85	180		SKF	SPHERICAL ROLLER THRUST BEARINGS
  MDJ35	35	80	31	R&M	DEEP GROOVE BALL BEARINGS
  4426	2.0625	3.1875		INA	THRUST BALL BEARINGS
  180BA03	180	380	75	Torrington	ANGULAR CONTACT BALL BEARINGS