31308- Tapered roller bearing-FGFA bearings

31308 Single row tapered roller bearing

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.

Dimension series

7FB

Dimensions

d	40 mm	Bore diameter
D	90 mm	Outside diameter
T	25.25 mm	Total width
d₁	≈67.15 mm	Shoulder diameter of inner ring
B	23 mm	Width of inner ring
C	17 mm	Width of outer ring
r_1,2	min.2 mm	Chamfer dimension of inner ring
r_3,4	min.1.5 mm	Chamfer dimension of outer ring
a	28.25 mm	Distance side face to pressure point

Abutment dimensions

d_a	max.51 mm	Diameter of shaft abutment
d_b	min.50 mm	Diameter of shaft abutment
D_a	min.71 mm	Diameter of housing abutment
D_a	max.82.5 mm	Diameter of housing abutment
D_b	min.86 mm	Diameter of housing abutment
C_a	min.3 mm	Minimum width of space required in housing on large side face
C_b	min.8 mm	Minimum width of space required in housing on small side face
r_a	max.2 mm	Radius of shaft fillet
r_b	max.1.5 mm	Radius of housing fillet

Calculation data

FGFA performance class		FGFA Explorer
Basic dynamic load rating	C	91.1 kN
Basic static load rating	C₀	81.5 kN
Fatigue load limit	P_u	9.5 kN
Reference speed		5 600 r/min
Limiting speed		7 500 r/min
Limiting value	e	0.83
Calculation factor	Y	0.72
Calculation factor	Y₀	0.4

Basic Parameters

Bearing Inner Diameter：40 mm
Bearing Outer Diameter：90 mm
Bearing Thickness：25.25 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.