BK 4020-Needle roller bearing-FGFA bearings

BK 4020 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	40 mm	Diameter under rollers
D	47 mm	Outside diameter
C	20 mm	Width
C₁	min.17.3 mm	Depth of the drawn cup BK
r	min.0.8 mm	Chamfer dimension drawn cup (outer ring)

Calculation data

Basic dynamic load rating	C	24.2 kN
Basic static load rating	C₀	53 kN
Fatigue load limit	P_u	6.4 kN
Reference speed		6 300 r/min
Limiting speed		7 000 r/min

Associated products

Inner ring IR series	IR 35x40x20.5
Inner ring LR series	LR 35x40x20.5
Radial shaft seal with a low cross-sectional height, single lip	G 40x47x4
Radial shaft seal with a low cross-sectional height, double lip	SD 40x47x4

Basic Parameters

Bearing Inner Diameter：40 mm
Bearing Outer Diameter：47 mm
Bearing Thickness：20 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.