Bearings, units and housings -- Super-precision bearings -- Cylindrical roller bearings -- Cylindrical roller bearings, double row, super-precision -- SKF NNU 4921 BK/SPW33

NNU 4921 BK/SPW33

Dimensions

d		105	mm
D		145	mm
B		40	mm
D₁		130.8	mm
F		118	mm
b		5.5	mm
K		3	mm
r_1,2	min.	1.1	mm
r_3,4	min.	0.6	mm
s	max.	1.1	mm

Tapered bore, taper 1:12

Abutment dimensions

d_a	min.	111	mm
d_a	max.	116	mm
D_a	max.	138.5	mm
d_n		119	mm

Calculation data

Basic dynamic load rating	C	130	kN
Basic static load rating	C₀	260	kN
Fatigue load limit	P_u	30	kN
Attainable speed for grease lubrication		5300	r/min
Attainable speed for oil-air lubrication		6000	r/min
Reference grease quantity	G_ref	15	cm³
Static radial stiffness (guideline value)		3040	N/µm

Mass

Mass bearing

Model Number: NNU 4921 BK/SPW33
Inner Diameter：105mm Outer Diameter：145mm Width：40mm
Reference speed:- Limiting speed:-
Type：Bearings, units and housings Super-precision bearings Cylindrical roller bearings Cylindrical roller bearings, double row, super-precision
Details： Cylindrical roller bearings, double row, super-precision
Update date：2026-04-17
Application:Water Monitoring,,instrument,hydraulic cylinder,spectrometer,powder metallurgy,sawing machine,miscellaneous instruments,plastic rolling,Liposuction device,other mold
Similar models:NNU 4921 B/SPW33 NNU 4921 BK/SPW33 GB 4921
BEARING POWER International Trading Co.,Ltd. specialize in NNU4921BK/SPW33 products，there is large inventory of SKF NNU 4921 BK/SPW33 Cylindrical roller bearings, double row, super-precision. We has been built up long-term cooperation with SKF company, could make a bulk order of the NNU 4921 BK/SPW33 Which SKF NNU4921BK/SPW33 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.

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ECCN 040 R	14	137	-	Coupling systems
HK 5520	55	63	20	Bearings, units and housings
KR 80 XB	-	80	100	Bearings, units and housings
NUP 2212 ECM	60	110	28	Bearings, units and housings
OKC 170	170		-
W 61907	35	55	10	Bearings, units and housings
W 626 R-2Z	6	19	6	Bearings, units and housings

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