NU 421 M-Cylindrical roller bearing-FGFA bearings

NU 421 M Single row cylindrical roller bearing, NU design

Cylindrical roller bearings feature cylindrical rollers as rolling elements and are classified as separable bearings. The rollers and raceways engage in line contact, enabling high load-carrying capacity. Primarily designed to accommodate radial loads, these bearings exhibit minimal friction between the rolling elements and the flange of the bearing ring, making them suitable for high-speed rotation. They offer exceptional load-carrying capability and maximum rotational speeds.

Dimensions

d	105 mm	Bore diameter
D	260 mm	Outside diameter
B	60 mm	Width
D₁	≈206.3 mm	Shoulder diameter of outer ring
F	144.5 mm	Raceway diameter of inner ring
r_1,2	min.4 mm	Chamfer dimension
r_3,4	min.4 mm	Chamfer dimension
s	max.4.9 mm	Permissible axial displacement

Abutment dimensions

d_a	min.124 mm	Diameter of spacer sleeve
d_a	max.140 mm	Diameter of spacer sleeve
d_b	min.147 mm	Diameter of shaft abutment
D_a	max.241 mm	Diameter of housing abutment
r_a	max.3 mm	Radius of fillet
r_b	max.3 mm	Radius of fillet

Calculation data

Basic dynamic load rating	C	501 kN
Basic static load rating	C₀	570 kN
Fatigue load limit	P_u	64 kN
Reference speed		2 800 r/min
Limiting speed		3 400 r/min
Minimum load factor	k_r	0.15
Limiting value	e	0.2
Calculation factor	Y	0.6

Basic Parameters

Bearing Inner Diameter：105 mm
Bearing Outer Diameter：260 mm
Bearing Thickness：60 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.