NNCF 4948 CV-Cylindrical roller bearing-FGFA bearings

NNCF 4948 CV Double row full complement cylindrical roller bearing, NNCF design, with 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	240 mm	Bore diameter
D	320 mm	Outside diameter
B	80 mm	Width
d₁	≈271 mm	Shoulder diameter inner ring
D₁	≈291 mm	Shoulder diameter outer ring
b₁	8 mm	Width annular lubrication groove outer ring
K	4 mm	Diameter lubrication hole (outer ring)
s	max.5 mm	Permissible axial displacement from the normal position of one bearing ring relative to the other
r_1,2	min.2.1 mm	Chamfer dimension (open bearings)
r_3,4	min.2.1 mm	Chamfer dimension

Abutment dimensions

d_a	min.251 mm	Abutment diameter shaft
d_as	261 mm	Abutment diameter shaft
D_a	max.308 mm	Abutment diameter housing
r_a	max.2 mm	Fillet radius
r_b	max.2 mm	Fillet radius

Calculation data

Basic dynamic load rating	C	781 kN
Basic static load rating	C₀	1 760 kN
Fatigue load limit	P_u	173 kN
Reference speed		850 r/min
Limiting speed		1 100 r/min
Minimum load factor	k_r	0.25

Tolerances: Normal
Axial internal clearance

Basic Parameters

Bearing Inner Diameter：240 mm
Bearing Outer Diameter：320 mm
Bearing Thickness：80 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.