NKIB 5904-Needle roller bearing-FGFA bearings

NKIB 5904 Combined needle roller / angular contact ball bearing for axial loads in both directions

Needle roller bearings are compact transmission components utilising slender needle rollers as rolling elements. Their core advantages lie in their small size and high radial load capacity – within equivalent installation space, they far exceed the load-bearing capacity of standard ball bearings while offering a compact structure that significantly reduces equipment footprint. Suitable for medium-to-low speed applications, they exhibit impact resistance, stable transmission efficiency, and facilitate straightforward installation and maintenance.

Dimensions

d	20 mm	Bore diameter
D	37 mm	Outside diameter
B	25 mm	Width
C	23 mm	Width of outer ring
F	25 mm	Diameter of inner ring raceway
r₁_,2	min.0.3 mm	Chamfer dimension

Abutment dimensions

d_a	min.22 mm	Diameter of shaft abutment
D_a	max.35 mm	Diameter of housing abutment
r_a	max.0.3 mm	Radius of fillet

Calculation data

Basic dynamic load rating, radial	C	21.6 kN
Basic static load rating, radial	C₀	28 kN
Basic dynamic load rating, axial	C	3.79 kN
Basic static load rating, axial	C₀	4.21 kN
Fatigue load limit, radial	P_u	3.35 kN
Fatigue load limit, axial	P_u	0.176 kN
Reference speed		15 000 r/min
Limiting speed		17 000 r/min

Tolerances: Normal

Basic Parameters

Bearing Inner Diameter：20 mm
Bearing Outer Diameter：37 mm
Bearing Thickness：25 mm

Wafangdian Fafuge Bearing Co., Ltd., rooted in Wafangdian Bearing Industry Base, is an emerging professional bearing manufacturer. Drawing on the base’s profound industrial heritage, we have upheld craftsmanship since inception, integrated precision manufacturing into R&D and production, and focused on the R&D and refined production of spherical roller bearings.