RPNA 40/55-Needle roller bearing-FGFA bearings

RPNA 40/55 Alignment needle roller bearings, without an inner ring

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

F_w	40 mm	Diameter under rollers
D	55 mm	Outside diameter
C	20 mm	Width
D₁	50.5 mm	Shoulder diameter sleeve
r	min.0.8 mm	Chamfer dimension sheet steel sleeve

Abutment dimensions

D_a	min.49.5 mm	Smallest permissible abutment diameter housing
D_a	max.50.5 mm	Diameter of housing abutment
r_a	max.0.8 mm	Fillet radius

Calculation data

Basic dynamic load rating	C	26.4 kN
Basic static load rating	C₀	51 kN
Fatigue load limit	P_u	6.3 kN
Reference speed		10 000 r/min
Limiting speed		11 000 r/min

Tolerances: Normal, ISO - F6 (F_w)

Basic Parameters

Bearing Inner Diameter：40 mm
Bearing Outer Diameter：55 mm
Bearing Thickness：20 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.