NNU 4176 M-Cylindrical roller bearing-FGFA bearings

NNU 4176 M Double row cylindrical roller bearing, NNU 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.

Design variant/feature

NNU

Dimensions

d	380 mm	Bore diameter
D	620 mm	Outside diameter
B	243 mm	Overall bearing width
D₁	≈550 mm	Shoulder diameter outer ring
F	442 mm	Raceway diameter inner ring
r_1,2	min.5 mm	Chamfer dimension outer ring
r_3,4	min.5 mm	Chamfer dimension inner ring
s	max.7.4 mm	Permissible axial displacement from the normal position of one bearing ring relative to the other

Abutment dimensions

d_a	min.400 mm	Abutment diameter spacer sleeve
d_a	max.434 mm	Abutment diameter spacer sleeve
d_b	min.447 mm	Abutment diameter shaft
D_a	max.600 mm	Abutment diameter spacer sleeve / housing
r_a	max.4 mm	Fillet radius
r_b	max.4 mm	Fillet radius

Calculation data

Basic dynamic load rating	C	4 290 kN
Basic static load rating	C₀	8 500 kN
Fatigue load limit	P_u	680 kN
Reference speed		850 r/min
Limiting speed		1 100 r/min
Calculation factor	k_r	0.33

Tolerances: Normal, P6, P5
Radial internal clearance: cylindrical bore, tapered bore

Basic Parameters

Bearing Inner Diameter：380 mm
Bearing Outer Diameter：620 mm
Bearing Thickness：243 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.