K 21X25X13-Needle roller bearing-FGFA bearings

K 21X25X13 Single row needle roller and cage assembly

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	21 mm	Diameter under rollers
E_w	25 mm	Outside diameter roller complement
U	13 mm	Width needle roller and cage assembly

Calculation data

Basic dynamic load rating	C	9.68 kN
Basic static load rating	C₀	15.3 kN
Fatigue load limit	P_u	1.76 kN
Reference speed		19 000 r/min
Limiting speed		22 000 r/min

Associated products

Shaft and housing tolerances

Basic Parameters

Bearing Inner Diameter：21 mm
Bearing Outer Diameter：25 mm
Bearing Thickness：13 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.