21311E Double Row Spherical Roller Bearing E Optimized High Load Straight Bore 55x120x29mm Mining Crusher Heavy Industrial Equipment

The 21311E is double row E-type optimized high-capacity spherical roller bearing with straight cylindrical bore, standard dimension 55×120×29mm. Suffix E stands for upgraded internal geometry without inner ring center rib, fitted with longer crowned rollers and two stamped steel cages, boosting dynamic load capacity by 20%~30% vs standard series. Spherical outer raceway delivers strong self-aligning performance to offset shaft deflection and assembly misalignment, withstands heavy combined radial load, bidirectional axial thrust and frequent impact shocks. Outer ring built-in lubrication groove & holes support periodic regreasing, widely used in mining crushers, cement mixers, belt conveyors, heavy gearboxes and construction rotary equipment.

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👉 Full technical datasheet and installation drawings available upon request

• E optimized internal design: cancel inner central rib, accommodate longer larger crowned rollers, greatly improve load rating and service life
• Spherical outer ring self-aligning structure, allows ±0.5° angular deflection without overheating or abnormal friction
• Double row symmetrical rollers bear heavy radial + bidirectional axial composite load, excellent anti-shock & anti-vibration property
• Outer ring with integrated W33 lubrication groove and three oil holes for convenient on-site grease replenishment
• Stamped steel cages low cost, strong impact resistance, stable operation under dusty harsh heavy-duty conditions
• Two structural options: straight bore 21311E for stepped shafts, tapered bore 21311EK fit adapter sleeves for smooth shafts
• Multiple clearance grades (C3/C4) customized for high-temperature, dusty mining continuous production lines

👉 High-load shock-resistant self-aligning bearing solution for mining, cement and heavy industrial machinery

This 21311E high-capacity spherical roller bearing is widely matched to:

• Mining jaw/cone crushers, mineral processing rotary equipment and long-distance belt conveyors
• Cement concrete mixers, kiln auxiliary rollers and heavy-duty stirring transmission assemblies
• Construction road rollers, large agricultural harvesters and heavy vehicle gearboxes
• Paper making large drying rollers, woodworking heavy rotary machines and industrial fans
• General heavy equipment with shaft bending, frequent startup and heavy impact working conditions

👉 Cost-effective long-life heavy-duty bearing for mining, construction and cement industry

• 25+ years experience in E-type spherical roller bearing manufacturing
• Exported to 50+ countries worldwide
• Rich OEM bulk order experience for high-load 21300 series self-aligning bearings
• Strict roller surface finish, hardness and heavy impact fatigue durability inspection before shipment
• Fast professional technical reply within 24 hours
• Stable mass supply for long-term mining and cement machinery factory cooperation

👉 We focus on stable high-load self-aligning wear resistance and reliable long‑term partnership

• GCr15 bearing steel raw material composition & hardness inspection
• Ultra-precision grinding for spherical outer raceway and crowned rollers
• Standard quenching & tempering heat treatment for uniform surface hardness HRC60–64
• Self-aligning deflection test, composite load fatigue test and full dimensional recheck
• Anti-rust oil treatment and shockproof wooden case packaging before delivery

👉 Consistent shock-resistant high-load self-aligning operation performance guaranteed for every bearing

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• Fast factory quotation within 24h
• Professional mining crusher heavy bearing technical parameter support
• Custom tapered bore 21311EK & C3/C4 enlarged clearance solution suggestions
• Competitive bulk wholesale factory price

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