NKIA 5903-Needle roller bearing-FGFA bearings

NKIA 5903 Combined needle roller / angular contact ball bearing for axial loads in one direction

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	17 mm	Bore diameter
D	30 mm	Outside diameter
B	18 mm	Width
F	22 mm	Diameter of inner ring raceway
r₁_,2	min.0.3 mm	Chamfer dimension

Abutment dimensions

d_a	min.19 mm	Diameter of shaft abutment
D_a	max.28 mm	Diameter of housing abutment
r_a	max.0.3 mm	Radius of fillet

Calculation data

Basic dynamic load rating, radial	C	11.4 kN
Basic static load rating, radial	C₀	16.3 kN
Basic dynamic load rating, axial	C	2.24 kN
Basic static load rating, axial	C₀	2.74 kN
Fatigue load limit, radial	P_u	1.96 kN
Fatigue load limit, axial	P_u	0.116 kN
Reference speed		18 000 r/min
Limiting speed		20 000 r/min

Tolerances: Normal

Basic Parameters

Bearing Inner Diameter：17 mm
Bearing Outer Diameter：30 mm
Bearing Thickness：18 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.