7280 BM-Angular contact ball bearing-FGFA bearings

7280 BM Single row angular contact ball bearing

Angular contact ball bearings can simultaneously accommodate radial and axial loads. They are capable of operating at high rotational speeds. The greater the contact angle, the higher the axial load capacity. High-precision and high-speed bearings typically employ a 15-degree contact angle. Under axial force, the contact angle increases.

Dimensions

d	400 mm	Bore diameter
D	720 mm	Outside diameter
B	103 mm	Width
d₁	≈532 mm	Shoulder diameter of inner ring (large side face)
d₂	≈486 mm	Shoulder diameter of inner ring (small side face)
D₁	≈591 mm	Shoulder diameter of outer ring (large side face)
a	287 mm	Distance side face to pressure point
r_1,2	min.6 mm	Chamfer dimension
r_3,4	min.3 mm	Chamfer dimension

Abutment dimensions

d_a	min.423 mm	Diameter of shaft abutment
D_a	max.697 mm	Abutment diameter housing
D_b	max.707 mm	Diameter of housing abutment
r_a	max.5 mm	Radius of fillet
r_b	max.2.5 mm	Radius of fillet

Calculation data

Basic dynamic load rating	C	728 kN
Basic static load rating	C₀	1 500 kN
Fatigue load limit	P_u	26.5 kN
Reference speed		900 r/min
Limiting speed		900 r/min
Minimum axial load factor	A	36.3
Minimum radial load factor	k_r	0.08
Limiting value	e	1.14

Single bearing or bearing pair arranged in tandem
Calculation factor (single, tandem)	X	0.35
Calculation factor (single, tandem)	Y₀	0.26
Calculation factor (single, tandem)	Y₂	0.57

Bearing pair arranged back-to-back or face-to-face
Calculation factor (back-to-back, face-to-face)	X	0.57
Calculation factor (back-to-back, face-to-face)	Y₀	0.52
Calculation factor (back-to-back, face-to-face)	Y₁	0.55
Calculation factor (back-to-back, face-to-face)	Y₂	0.93

Tolerances: Normal ( ), P6, P5, Normal (inch)
Internal clearance: CA+CB+CC, G
Preload: GA+GB+GC

Basic Parameters

Bearing Inner Diameter：400 mm
Bearing Outer Diameter：720 mm
Bearing Thickness：103 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.