SKF 30311 — Tapered roller bearing
SKF · Bearings & Power Transmission · Tapered Roller Bearings
SKF 30311 tapered roller bearing. Single-row tapered roller bearing designed to take combined heavy radial and one-direction axial load. Rollers, inner ring raceway (cone) and outer ring raceway (cup) are ground to converge at a common apex on the bearing axis. Two bearings are always mounted in opposition so the pair carries axial load in both directions and can be preloaded to remove all internal clearance. Metric dimensions per ISO 355 / ISO 492 Class Normal. Bore diameter d = 55 mm per ISO 15. Designation follows the ISO 15 / DIN 623 alphanumeric convention where the numeric block encodes the dimension series and bore code; suffixes after the numeric block declare cage, closure, precision, clearance and lubricant execution. Genuine SKF supply carries the SKF logo etch on the outer ring face and hologram-authenticated packaging. Boundary plan per ISO 15 / ISO 355: bore d = 55 mm, outside diameter D = 120 mm, width B (or height H) = 31.5 mm.
Specifications
- Part number
- 30311
- HS code
- 8482.20
- Material
- Bearing steel — 100Cr6 (through-hardened) or SNR-nitrided; cage as declared by suffix
- Dimensions
- 55 × 120 × 31.5 mm (bore d × OD D × width B / height H)
- Temperature range
- -30 to +120 °C standard grease
- Standard
- ISO 15 / ISO 492 / DIN 623
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
Also known as — OEM cross-references & superseded numbers
- Timken 30311
- NSK 30311
- NTN 30311
- FAG 30311
- Koyo 30311
- Competitor equivalent: 30311 (Timken)
- Competitor equivalent: 30311 (NSK)
- Competitor equivalent: 30311 (NTN)
- Competitor equivalent: 30311 (FAG)
- Competitor equivalent: 30311 (Koyo)
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