BK 0408-Needle roller bearing-FGFA bearings

BK 0408 Drawn cup needle roller bearing with a closed end

Needle roller bearings are compact transmission components utilising slender needle rollers as rolling elements. Their core advantages lie in their small size and high radial load capacity – within equivalent installation space, they far exceed the load-bearing capacity of standard ball bearings while offering a compact structure that significantly reduces equipment footprint. Suitable for medium-to-low speed applications, they exhibit impact resistance, stable transmission efficiency, and facilitate straightforward installation and maintenance.

Dimensions

F_w	4 mm	Diameter under rollers
D	8 mm	Outside diameter
C	8 mm	Width
C₁	min.6.4 mm	Depth of the drawn cup BK
r	min.0.3 mm	Chamfer dimension drawn cup (outer ring)

Calculation data

Basic dynamic load rating	C	1.76 kN
Basic static load rating	C₀	1.37 kN
Fatigue load limit	P_u	0.14 kN
Reference speed		22 000 r/min
Limiting speed		26 000 r/min

Associated products

Radial shaft seal with a low cross-sectional height, single lip

G 4x8x2 S

Basic Parameters

Bearing Inner Diameter：4 mm
Bearing Outer Diameter：8 mm
Bearing Thickness：8 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.