1208 ETN9-Self-aligning ball bearing-FGFA bearings

1208 ETN9 Self-aligning ball bearing

Self-aligning ball bearings are transmission components featuring automatic self-alignment capabilities, capable of compensating for installation misalignment between shafts and bearing housings (such as coaxiality errors). Suited for high-speed operation, they offer a compact structure, stable load-bearing performance, and straightforward maintenance. These bearings find extensive application in equipment including electric motors, pumps and valves, and construction machinery.

Bore type

Cylindrical

Dimensions

d	40 mm	Bore diameter
D	80 mm	Outside diameter
B	18 mm	Width
d₁	≈53.85 mm	Shoulder diameter inner ring
D₁	≈67.5 mm	Shoulder diameter outer ring
r_1,2	min.1.1 mm	Chamfer dimension

Abutment dimensions

d_a	min.47 mm	Abutment diameter shaft
D_a	max.73 mm	Abutment diameter housing
r_a	max.1.1 mm	Fillet radius

Calculation data

Basic dynamic load rating	C	19.9 kN
Basic static load rating	C₀	6.95 kN
Fatigue load limit	P_u	0.355 kN
Reference speed		18 000 r/min
Limiting speed		11 000 r/min
Permissible angular misalignment	α	2.5 °
Calculation factor	k_r	0.04
Limiting value	e	0.22
Calculation factor	Y₀	2.8
Calculation factor	Y₁	2.9
Calculation factor	Y₂	4.5

Tolerances: Normal, JS7

Tolerances and resultant fits

Basic Parameters

Bearing Inner Diameter：40 mm
Bearing Outer Diameter：80 mm
Bearing Thickness：18 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.