SKF 21308E Spherical roller bearing

SKF · Bearings & Power Transmission · Spherical Roller Bearings · Sweden · skf.com

Part Number
21308E · HS 8482.20

SKF 21308E spherical roller bearing. Self-aligning double-row spherical roller bearing designed for very heavy radial load with concurrent axial load in either direction, and inherent tolerance for shaft-to-housing misalignment. Two rows of symmetrical rollers ride on a common concave outer-ring raceway. Common execution suffixes cover CC (window-type cage), CA (machined brass cage), EK (tapered bore for adapter-sleeve mount), and W33 (annular groove and three lubrication holes in outer ring). Manufactured to ISO 492 Class Normal / P6. Bore diameter d = 40 mm per ISO 15.

Technical Specifications

Type	Spherical roller bearing
Designation	SKF 21308E
Standard	ISO 15 / DIN 623 dimension plan; ISO 492 Class Normal precision
HS code	8482.20
Bore diameter	40 mm
Outside diameter	90 mm
Width	23 mm
Basic dynamic load rating	107 kN
Basic static load rating	108 kN
Reference speed	7000 r/min
Limiting speed	9500 r/min
SKF performance class	SKF Explorer
Number of rows	2
Locating feature, bearing outer ring	Without
Bore type	Cylindrical
Cage	Sheet metal
Radial internal clearance	CN
Tolerance class for dimensions	Normal
Tolerance class for run-out	P5
Sealing	Without
Lubricant	None
Relubrication feature	With
Indicative carbon footprint for new product	2.7 kg CO2e
Product net weight	0.738 kg
eClass code	23-05-09-11
UNSPSC code	31171510

Properties

Material	Bearing steel — 100Cr6 (through-hardened) or SNR-nitrided; cage as declared by suffix
Temperature range	-30 to +120 °C standard grease
Primary standard	ISO 15 / ISO 492 / DIN 623
Dimensions	bore d = 40 mm
MOQ	1

Compatibility

ISO 15 boundary-plan interchange — the numeric bore-code block is portable across every ISO 15 bearing manufacturer (SKF, Timken, NSK, NTN, FAG, Koyo, NACHI). Confirm suffix compatibility on cage, seal, clearance and precision class before substitution.

Standards

ISO 15
ISO 492
DIN 623

Cross-References

Timken 21308
NSK 21308
NTN 21308
FAG 21308
Koyo 21308

Attached Documents

SKF 21308E Spherical roller bearing — Specification sheet