718/670 ACMB-Angular contact ball bearing-FGFA bearings

718/670 ACMB 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	670 mm	Bore diameter
D	820 mm	Outside diameter
B	69 mm	Width
d₁	≈720.5 mm	Shoulder diameter of inner ring (large side face)
D₁	≈771 mm	Shoulder diameter of outer ring (large side face)
a	208 mm	Distance side face to pressure point
r_1,2	min.4 mm	Chamfer dimension
r_3,4	min.1.5 mm	Chamfer dimension

Abutment dimensions

d_a	min.685 mm	Diameter of shaft abutment
D_a	max.805 mm	Abutment diameter housing
D_b	max.813 mm	Diameter of housing abutment
r_a	max.3 mm	Radius of fillet
r_b	max.1.5 mm	Radius of fillet

Calculation data

Basic dynamic load rating	C	553 kN
Basic static load rating	C₀	1 290 kN
Fatigue load limit	P_u	22.4 kN
Reference speed		700 r/min
Limiting speed		750 r/min
Minimum axial load factor	A	9.48
Minimum radial load factor	k_r	0.08
Limiting value	e	0.68

Single bearing or bearing pair arranged in tandem
Calculation factor (single, tandem)	X	0.41
Calculation factor (single, tandem)	Y₀	0.38
Calculation factor (single, tandem)	Y₂	0.87

Bearing pair arranged back-to-back or face-to-face
Calculation factor (back-to-back, face-to-face)	X	0.67
Calculation factor (back-to-back, face-to-face)	Y₀	0.76
Calculation factor (back-to-back, face-to-face)	Y₁	0.92
Calculation factor (back-to-back, face-to-face)	Y₂	1.41

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

Basic Parameters

Bearing Inner Diameter：670 mm
Bearing Outer Diameter：820 mm
Bearing Thickness：69 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.