NNU 4164 F-Cylindrical roller bearing-FGFA bearings

NNU 4164 F 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	320 mm	Bore diameter
D	540 mm	Outside diameter
B	218 mm	Overall bearing width
D₁	≈476 mm	Shoulder diameter outer ring
F	375 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.8.9 mm	Permissible axial displacement from the normal position of one bearing ring relative to the other

Abutment dimensions

d_a	min.340 mm	Abutment diameter spacer sleeve
d_a	max.365 mm	Abutment diameter spacer sleeve
d_b	min.379 mm	Abutment diameter shaft
D_a	max.520 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	3 690 kN
Basic static load rating	C₀	6 200 kN
Fatigue load limit	P_u	530 kN
Reference speed		1 000 r/min
Limiting speed		1 300 r/min
Calculation factor	k_r	0.13

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

Basic Parameters

Bearing Inner Diameter：320 mm
Bearing Outer Diameter：540 mm
Bearing Thickness：218 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.