NNF 5056 B-2LS-Cylindrical roller bearing-FGFA bearings

NNF 5056 B-2LS Double row full complement cylindrical roller bearing, NNF design, with integral sealing and relubrication feature

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	280 mm	Bore diameter
D	420 mm	Outside diameter
B	190 mm	Width
C	189 mm	Outer ring width (sealed bearing)
d₁	≈333 mm	Shoulder diameter inner ring
D₃	413 mm	Snap ring groove diameter at outer ring
C₁	163.2 mm	Distance between two snap ring grooves of the outer ring outside surface
	+0.2 mm	Tolerance for distance C₁
C₂	12.9 mm	Distance outer ring side face - snap ring groove (sealed bearing)
b	7.3 mm	Width snap ring groove outer ring
b₁	9.5 mm	Width annular lubrication groove outer ring
K	6 mm	Diameter lubrication hole (outer ring)
r	min.2 mm	Chamfer dimension (sealed bearing)
r_3,4	min.1.1 mm	Chamfer dimension

Abutment dimensions

d_a	min.288 mm	Abutment diameter shaft
d_as	324 mm	Abutment diameter shaft
C_a1	154 mm	Abutment width applying for SW snap rings (sealed brg.)
	–0.2 mm	Tolerance for abutment C_a (SW snap rings)
C_a2	149 mm	Abutment width applying for DIN 471 snap rings (sealed brg.)
	–0.2 mm	Tolerance for abutment C_a (DIN 471 snap rings)
r_a	max.2 mm	Fillet radius

Calculation data

Basic dynamic load rating	C	2 550 kN
Basic static load rating	C₀	5 000 kN
Fatigue load limit	P_u	490 kN
Limiting speed		280 r/min
Minimum load factor	k_r	0.4

Associated products

Snap ring Seeger	SW 420
Snap ring in accordance with DIN 471	420x7

Tolerances: Normal
Axial internal clearance

Basic Parameters

Bearing Inner Diameter：280 mm
Bearing Outer Diameter：420 mm
Bearing Thickness：190 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.