QJ 1256 N2MA-Angular contact ball bearing-FGFA bearings

QJ 1256 N2MA Four-point contact ball bearing with locating slots

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	280 mm	Bore diameter
D	500 mm	Outside diameter
B	90 mm	Width
d₁	≈365 mm	Shoulder diameter inner ring
D₁	≈415 mm	Shoulder diameter outer ring/ inner diameter housing washer
a	390 mm	Distance pressure point(s)
h	15 mm	Locating slot depth outer ring
b	12.5 mm	Locating slot width outer ring
r₀	2.5 mm	Corner radius locating slot
r_1,2	min.5 mm	Chamfer dimension inner ring

Abutment dimensions

d_a	min.302 mm	Abutment diameter shaft
D_a	max.478 mm	Abutment diameter housing
r_a	max.4 mm	Fillet radius

Calculation data

Basic dynamic load rating	C	728 kN
Basic static load rating	C₀	1 460 kN
Fatigue load limit	P_u	31.5 kN
Limiting speed		2 000 r/min
Calculation factor	A	13
Limiting value	e	1.34
Calculation factor	X	0.54
Calculation factor	Y₀	0.44
Calculation factor	Y₁	0.47
Calculation factor	Y₂	0.81

Tolerances: Normal, P6
Internal clearance: table

Basic Parameters

Bearing Inner Diameter：280 mm
Bearing Outer Diameter：500 mm
Bearing Thickness：90 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.