d - 4 mm

D - 10 mm

B - 4 mm

d₁ - - 5.9 mm

D₂ - - 8.8 mm

D₃ - 11.6 mm

C - 0.8 mm

r_1,2 - min. - 0.15 mm

d_a - min. - 5.6 mm

r_a - max. - 0.15 mm

Basic dynamic load rating - C - 0.553 kN

Basic static load rating - C₀ - 0.245 kN

Fatigue load limit - P_u - 0.011 kN

Reference speed - 130000 r/min

Limiting speed - 63000 r/min

Calculation factor - k_r - 0.02

Calculation factor - f₀ - 12.3

Mass bearing - 0.0015 kg

• Model Number:W 638/4 XR-2Z
• Inner Diameter：10mm Outer Diameter：4mm Width：4mm
• Type：Deep Groove Ball Bearings
• Update date：2025-12-10
• Application:Safety protection,roller lathe,Polymer,sanitation facilities,survey accessories,CNC,molding machine,woodworking machinery,light therapy instrument,tower crane,Sensors
• Similar models:ISB F63801 ISB 63801 ISO 63803ZZ SKF W638/4X-2RS1 CX 63801-2RS SKF W638/2-2Z ZEN F63800 SKF W63800-2RS1 NSK 638 SKF W63803-2RS1
• BEARING POWER International Trading Co.,Ltd. specialize in W638/4XR-2Z products，there is large inventory of SKF W 638/4 XR-2Z . We has been built up long-term cooperation with SKF company, could make a bulk order of the W 638/4 XR-2Z Which SKF W638/4XR-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
  16009	45,000	75,000	10,000	NTN-SNR	Deep Groove Ball Bearings
  19150/19281	38,1	71,438	15,875	Timken	Tapered Roller Bearings
  3008-B-TVH	40	68	21	FAG	Angular Contact Ball Bearings
  31326-X-N11CA-A160-200	130	280	144	FAG	Tapered Roller Bearings
  32917XU	85	120	23	NTN	Tapered Roller Bearings
  54306 U 306	25	60	41,3	ISB	Thrust Ball Bearings
  6008	40	68	15	ZEN	Deep Groove Ball Bearings
  6213-Z	65	120	23	ISB	Deep Groove Ball Bearings
  6216ZZD2	80,000	140,000	52,000	NTN	Deep Groove Ball Bearings
  DC5016N	80	125	60	KOYO	Cylindrical Roller Bearings
  NF307E	35,000	80,000	21,000	NTN	Cylindrical Roller Bearings
  NJ29/630	630	850	128	CX	Cylindrical Roller Bearings
  NJ340	200	420	80	ISO	Cylindrical Roller Bearings
  ZARN 2062 L TN	20	62	20	NBS	Complex Bearings
  120440	.7500	1.2500	2.5000	BAL	JOURNAL ROLLER ASSEMBLIES
  16080	400	600	63	STEYR	DEEP GROOVE BALL BEARINGS
  XLS56K	3.5000	5.0000	.7500	Torrington	DEEP GROOVE BALL BEARINGS
  YET-207-106CW	1.3750	2.8346	.6693	SKF	BALL BEARINGS
  SN-310..2310	50	-	70	CONSOLIDATED	PILLOW BLOCKS
  SSR-3-2RS	.1875	.5000	.1968	CONSOLIDATED	DEEP GROOVE BALL BEARINGS