Bearings, units and housings -- Ball bearings -- Deep groove ball bearings -- Deep groove ball bearings -- SKF W 637/4 X-2Z

W 637/4 X-2Z

Dimensions

d		4	mm
D		8	mm
B		3	mm
d₁	≈	5	mm
D₂	≈	7.4	mm
r_1,2	min.	0.1	mm

Abutment dimensions

d_a	min.	4.8	mm
d_a	max.	4.9	mm
D_a	max.	7.5	mm
r_a	max.	0.1	mm

Calculation data

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

Mass bearing

0.00051

Model Number: W 637/4 X-2Z
Inner Diameter：4mm Outer Diameter：8mm Width：3mm
Reference speed:75000 r/min Limiting speed:150000 r/min
Type：Bearings, units and housings Ball bearings Deep groove ball bearings Deep groove ball bearings
Details： Deep groove ball bearings
Update date：2025-12-09
Application:internal combustion engine,scientific instruments,municipal machinery,motor,physical instruments,industrial skin care,drawing die,glass,boring bar boring bar,special broaching machine,circulating pump
Similar models:PWM 556370 W 637/9-2ZS W 637/8 XR W 637/4 XR W 637/2-2Z W 637/5 XR-2Z W 637/4 X BC2B 326372/HA1 W 637/8 R-2ZS W 637/8 X
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Model No.	Inner Diameter	Outer Diameter	Width	Type
20554	52.4002	73.03	11.13	Seals
30205	25	52	16.25	Bearings, units and housings
400800	72	-	-	Seals
60x80x8 HMS5 V	60	80	8	Seals
660 VE R	640	-	-	Seals
BS2-2209-2RSK/VT143	45	85	28	Bearings, units and housings
D/W RW188-2Z	6.35	12.7	5.558	Bearings, units and housings
GEC 380 TXA-2RS	380	520	190	Bearings, units and housings
GEZM 304 ES	82.55	130.175	123.825	Bearings, units and housings
NA 4906.2RS	30	47	17	Bearings, units and housings
NATV 5	5	16	12	Bearings, units and housings
NCF 1840 V	200	250	24	Bearings, units and housings

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Hot number： 213-ZNR 2218 K 22244-2CS5K/VT143 51140 M 86903 99273 99276 BT2-8143/HA1 FSAF 22615 x 2.3/8 FSYE 3 15/16 NCF 3012 CV NUP 213 ECML PCMW 142601.5 E SNL 3172 ATURA YARAG 208