BT4B 331089 E/C775- Tapered roller bearing-FGFA bearings

BT4B 331089 E/C775 Four-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.

Design variant/feature	TQON/GW
Bore type	Cylindrical with helical groove

Dimensions

d	685.8 mm	Bore diameter
D	876.3 mm	Outside diameter
B	352.425 mm	Total bearing width over inner rings
T	355.6 mm	Total bearing width over outer rings
d₁	≈729 mm	Abutment diameter shaft
D₁	≈814 mm	Abutment diameter housing
r_1,2	min.3.3 mm	Chamfer dimension inner ring
r_3,4	min.2 mm	Outer ring radius (chamfer)

Calculation data

FGFA performance class		FGFA Explorer
Basic dynamic load rating	C	9 000 kN
Basic static load rating	C₀	22 000 kN
Fatigue load limit	P_u	1 500 kN
Comparative radial load rating	C_F	2 200 kN
Comparative axial load rating	C_Fa	450 kN
Thrust factor	K	1.4
Limiting value	e	0.43
Calculation factor	Y₁	1.6
Calculation factor	Y₂	2.3
Calculation factor	Y₀	1.6

Tolerances: bearings (Normal and CL7C), inch bearings
Internal clearance

Basic Parameters

Bearing Inner Diameter：685.8 mm
Bearing Outer Diameter：876.3 mm
Bearing Thickness：355.6 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.