30311/DF- Tapered roller bearing-FGFA bearings

30311/DF Matched tapered roller bearings arranged face-to-face

Tapered roller bearings are of the separable type, comprising an inner ring, outer ring, tapered rollers, and a cage. Through the matching of tapered raceways and rollers, they can simultaneously withstand substantial radial loads and unidirectional axial loads. Characterised by high load-carrying capacity and rigidity, they find extensive application in automotive hubs, machine tool spindles, construction machinery, mining equipment, and similar scenarios.

Dimensions

d	55 mm	Bore diameter
D	120 mm	Outside diameter
T	63 mm	Total width
2B	58 mm	Width of inner rings
b	8 mm	Width of lubrication groove
K	4.5 mm	Diameter of lubrication hole
r_3,4	min.2 mm	Chamfer dimension
r₅	min.0.6 mm	Chamfer dimension

Abutment dimensions

d_a	max.72 mm	Diameter of shaft abutment
D_a	min.104 mm	Diameter of housing abutment
D_a	max.110.5 mm	Diameter of housing abutment
C_a	min.4 mm	Minimum width of space required in housing on large side face
r_a	max.2.5 mm	Radius of fillet
r_c	max.0.6 mm	Radius of fillet

Calculation data

FGFA performance class		FGFA Explorer
Basic dynamic load rating	C	302 kN
Basic static load rating	C₀	325 kN
Fatigue load limit	P_u	39 kN
Reference speed		3 800 r/min
Limiting speed		5 600 r/min
Limiting value	e	0.35
Calculation factor	Y₁	1.9
Calculation factor	Y₂	2.9
Calculation factor	Y₀	1.8

Tolerances: Normal + CL7C, P5, total width
Internal clearance: values

Basic Parameters

Bearing Inner Diameter：55 mm
Bearing Outer Diameter：120 mm
Bearing Thickness：63 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.