305288 DA-Angular contact ball bearing-FGFA bearings

305288 DA Double row angular contact ball bearing with two-piece inner ring and relubrication feature

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	180 mm	Bore diameter
D	250 mm	Outside diameter
B	70 mm	Width
d₁	≈207.45 mm	Shoulder diameter inner ring for two-piece inner ring
D₁	≈234.7 mm	Shoulder diameter outer ring
b	11.7 mm	Width annular lubrication groove at outer ring
K	6 mm	Diameter lubrication hole (outer ring)
r_1,2	min.2 mm	Chamfer dimension inner ring for two-piece inner ring
a	216 mm	Distance pressure point(s)

Abutment dimensions

d_a	min.185 mm	Abutment diameter shaft
D_a	max.232 mm	Abutment diameter housing
r_a	max.2 mm	Fillet radius

Calculation data

Basic dynamic load rating	C	190 kN
Basic static load rating	C₀	285 kN
Fatigue load limit	P_u	8.65 kN
Reference speed		2 400 r/min
Limiting speed		2 600 r/min
Calculation factor	k_r	0.095
Limiting value	e	1.14
Calculation factor	X	0.57
Calculation factor	Y₀	0.52
Calculation factor	Y₁	0.55
Calculation factor	Y₂	0.93

Tolerances: Normal, P6, P5
Internal clearance: table, drawing no

Basic Parameters

Bearing Inner Diameter：180 mm
Bearing Outer Diameter：250 mm
Bearing Thickness：70 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.