21305 CC- Spherical roller bearings-FGFA bearings

21305 CC Spherical roller bearing

Self-aligning roller bearings are heavy-duty transmission components featuring automatic self-alignment. Their core comprises an inner ring, outer ring, barrel-shaped rollers, and a cage. They offer high load-carrying capacity, capable of simultaneously withstanding substantial radial loads and minor axial loads. These bearings exhibit excellent impact resistance, stable operation, and suitability for medium-to-low speed, heavy-load applications. They demonstrate low wear and extended service life.

Bore type

Cylindrical

Dimensions

d	25 mm	Bore diameter
t_Δdmp	-0.01 – 0.0 mm	Deviation limits of mid-range bore diameter
D	62 mm	Outside diameter
t_ΔDmp	-0.013 – 0.0 mm	Deviation limits of mid-range outside diameter
B	17 mm	Width
t_ΔBs	-0.06 – 0.0 mm	Deviation limits of ring width
d₂	≈35.7 mm	Shoulder diameter of inner ring
D₁	≈50.7 mm	Shoulder/recess diameter of outer ring
r_1,2	min.1.1 mm	Chamfer dimension
	Normal	ISO tolerance class for dimensions

Abutment dimensions

d_a	min.32 mm	Diameter of shaft abutment
D_a	max.55 mm	Diameter of housing abutment
r_a	max.1 mm	Radius of fillet

Calculation data

FGFA performance class		FGFA Explorer
Basic dynamic load rating	C	49.1 kN
Basic static load rating	C₀	41.5 kN
Fatigue load limit	P_u	4.55 kN
Reference speed		11 000 r/min
Limiting speed		15 000 r/min
Limiting value	e	0.3
Calculation factor	Y₁	2.3
Calculation factor	Y₂	3.4
Calculation factor	Y₀	2.2

Tolerances of run-out

Range of section height at inner ring of assembled bearing	t_Kia	4 µm
Maximum run-out of inner ring side face to the bore	t_Sd	8 µm
Range of section height at outer ring of assembled bearing	t_Kea	8 µm
Perpendicularity of outer ring outside surface	t_SD	4 µm
ISO tolerance class for geoal tolerances		P5

Radial internal clearance

Minimum initial clearance	25 µm
Maximum initial clearance	40 µm

Tolerances: Normal, P6, P5,
tapered bore 1:12, tapered bore 1:30
Radial internal clearance: cylindrical bore, tapered bore

Basic Parameters

Bearing Inner Diameter：25 mm
Bearing Outer Diameter：62 mm
Bearing Thickness：17 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.