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 lubriion groove & holes support periodic regreasing, widely used in mining crushers, cement mixers, belt conveyors, heavy gearboxes and construction rotary equipment.
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| Parameter | Value |
|---|---|
| Model | 21311E |
| Inner Diameter d | 55mm |
| Outer Diameter D | 120mm |
| Width B | 29mm |
| Min Fillet r | 2mm |
| Structure | Double row spherical roller bearing, E high-load optimized design, straight bore |
| Cage | Double stamped steel cages, floating guide ring centered on inner ring |
| Material | GCr15 high carbon chromium bearing steel |
| Basic Dynamic Load Cr | 156kN |
| Basic Static Load C0r | 166kN |
| Fatigue Load Limit Pu | 18.6kN |
| Grease Reference Speed | 5600rpm; Oil Limiting Speed:7500rpm |
| Net Weight | Approx 1.7kg |
| Clearance | Standard CN, C3/C4 enlarged clearance customizable |
| Interchange Variant | 21311EK (1:12 tapered bore matched adapter sleeve) |
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- 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 lubriion 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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Q1: What does suffix E mean on 21311E?
E represents optimized high-capacity internal structure, longer crowned rollers without inner ring central rib, 20%-30% higher dynamic load than standard models.
Q2: What is the difference between 21311E and 21311EK?
21311E is straight cylindrical bore for stepped shafts; 21311EK features 1:12 tapered inner bore, matched adapter sleeve for smooth cylindrical shafts.
Q3: What angular misalignment can this bearing adapt to?
Max allowable self-aligning angle reaches ±0.5°, suitable for shafts with slight bending or housing installation offset.
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