BC2B 316521-Cylindrical roller bearing-FGFA bearings

BC2B 316521 Double row cylindrical roller bearing

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.4/W33W

Dimensions

d	440 mm	Bore diameter
D	640 mm	Outside diameter
B	230 mm	Overall bearing width
D₁	≈578 mm	Shoulder diameter outer ring
F	482 mm	Raceway diameter inner ring
b	16.7 mm	Width of annular groove
K	9 mm	Diameter lubrication hole
r_1,2	min.6 mm	Chamfer dimension outer ring
r_3,4	min.6 mm	Chamfer dimension inner ring
s	max.5.5 mm	Permissible axial displacement from the normal position of one bearing ring relative to the other

Abutment dimensions

d_a	min.466 mm	Abutment diameter spacer sleeve
d_a	max.475 mm	Abutment diameter spacer sleeve
d_b	min.487 mm	Abutment diameter shaft
D_a	max.614 mm	Abutment diameter spacer sleeve / housing
r_a	max.5 mm	Fillet radius
r_b	max.5 mm	Fillet radius

Calculation data

Basic dynamic load rating	C	4 570 kN
Basic static load rating	C₀	9 800 kN
Fatigue load limit	P_u	780 kN
Reference speed		850 r/min
Limiting speed		1 000 r/min
Calculation factor	k_r	0.33

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

Basic Parameters

Bearing Inner Diameter：440 mm
Bearing Outer Diameter：640 mm
Bearing Thickness：230 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.