d - 4 mm

D - 9 mm

B - 4 mm

d₁ - - 5.2 mm

D₂ - - 8.1 mm

r_1,2 - min. - 0.1 mm

d_a - min. - 4.6 mm

d_a - max. - 5.1 mm

D_a - max. - 8.4 mm

r_a - max. - 0.1 mm

Basic dynamic load rating - C - 0.54 kN

Basic static load rating - C₀ - 0.18 kN

Fatigue load limit - P_u - 0.07 kN

Reference speed - 140000 r/min

Limiting speed - 70000 r/min

Calculation factor - k_r - 0.015

Calculation factor - f₀ - 10

Mass bearing - 0.0013 kg

• Model Number:638/4-2Z
• Inner Diameter：9mm Outer Diameter：4mm Width：4mm
• Type：Deep Groove Ball Bearings
• Update date：2023-03-04
• Application:Medical room equipment,laser devices,Performance test,Hairbrush device,Antenna Potentials,Doppler,Individual Wire,Energy saving energy saving energy saving energy saving energy saving energy saving energy saving energy saving energy saving energy saving energy saving,Processing machinery,Microwave Equipment,heating fans
• Similar models:CX 63803 NSK 638ZZ1 SKF W638/2.5R-2Z SKF W638/3R-2Z SKF W638/3R-2RS1 ZEN 63801-2RS ISB SS638/4-ZZ SKF 638-RZ ISB SS638/1,5-ZZ SKF W638/2.5-2Z
• BEARING POWER International Trading Co.,Ltd. specialize in 638/4-2Z products，there is large inventory of SKF 638/4-2Z . We has been built up long-term cooperation with SKF company, could make a bulk order of the 638/4-2Z Which SKF 638/4-2Z 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
  3201-B-2Z-TV	12	32	15,9	NKE	Angular Contact Ball Bearings
  239/500-K-MB	500	670	128	FAG	Spherical Roller Bearings
  2780/2729	36,487	76,2	23,812	Timken	Tapered Roller Bearings
  2917	85	115	22	INA	Thrust Ball Bearings
  33116	80	130	37	CRAFT	Tapered Roller Bearings
  65237/65500	60,325	127	44,45	CX	Tapered Roller Bearings
  C 3068 KM + AOH 3068 G	520	320	162	SKF	Cylindrical Roller Bearings
  K 240x250x42	240	250		NBS	Needle Roller Bearings
  NKS32	32	47	22	AST	Needle Roller Bearings
  NKS 60	60	80	28	NBS	Needle Roller Bearings
  NN3013K	65	100	26	KOYO	Cylindrical Roller Bearings
  NN3138 K	190	320	104	CX	Cylindrical Roller Bearings
  NNU4934C1NAP5	170	230	60	NTN	Cylindrical Roller Bearings
  R157.09				SNR	Wheel Bearings
  XW-5				INA	THRUST BALL BEARINGS
  NUP214E	70	125	24	SKF	CYLINDRICAL ROLLER BEARINGS
  2909	68	45		MRC	THRUST BALL BEARINGS
  FX1/4	.2500	.3750	.1250	SKF	DEEP GROOVE BALL BEARINGS
  N-1076-KMSP/5	380	560	82	CONSOLIDATED	CYLINDRICAL ROLLER BEARINGS
  W-11/4				CONSOLIDATED	THRUST BALL BEARINGS