RNAO 55X68X20-Needle roller bearing-FGFA bearings

RNAO 55X68X20 Single row needle roller bearing with machined rings, without flanges and 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	55 mm	Diameter under rollers
D	68 mm	Outside diameter
C	20 mm	Width
E	60 mm	Raceway diameter outer ring
r_1,2	min.0.6 mm	Chamfer dimension outer ring

Abutment dimensions

d_a	59.2 mm	Smallest permissible abutment diameter shaft, bearings without flanges
D_a	60.8 mm	Diameter of housing abutment
D_b	55.8 mm	Smallest permissible abutment diameter housing, bearings without flanges
r_a	max.0.6 mm	Fillet radius

Calculation data

Basic dynamic load rating	C	27 kN
Basic static load rating	C₀	67 kN
Fatigue load limit	P_u	8.15 kN
Reference speed		7 500 r/min
Limiting speed		8 500 r/min

Associated seals

Basic Parameters

Bearing Inner Diameter：55 mm
Bearing Outer Diameter：68 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.