FAGI 6311 2RS C3 P6 Deep Groove Ball Bearing
The FAGI 6311 2RS C3 P6 belongs to the heavy-duty envelope (ISO 63 "Heavy" Series), designed with standardized metric dimensions: 55 mm bore diameter (d), 120 mm outside diameter (D), and a 29 mm width (B). Distinct from the light 60-series or intermediate 62-series, the 63-series features substantially thickened ring cross-sections, significantly larger rolling elements (balls), and deepened raceways. This specific geometric design delivers superior basic dynamic load ratings and exceptionally high static shock resistance effectively protecting raceways against Brinelling deformation during abrupt torque spikes.
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Product Detail
Technical Specifications & Engineering Overview: FAGI 6311 2RS C3 P6 Deep Groove Ball Bearing (55x120x29 mm) Heavy Series (63 Series) with Dual NBR Contact Seals, C3 Internal Radial Clearance, and P6 Precision Rating (ISO Class 6)
Engineered from high-purity, through-hardened 100Cr6 bearing alloy steel with reinforced 63-series raceway geometry and P6 tolerances. Designed to withstand heavy dynamic radial loads, dual-direction axial thrust, and torsional shocks in 55 mm drive shafts across high-output electric motors, crushers, heavy process pumps, and industrial gearboxes.
Engineering Overview & Structural Architecture: FAGI 6311 2RS C3 P6
The FAGI 6311 2RS C3 P6 belongs to the heavy-duty envelope (ISO 63 "Heavy" Series), designed with standardized metric dimensions: 55 mm bore diameter (d), 120 mm outside diameter (D), and a 29 mm width (B). Distinct from the light 60-series or intermediate 62-series, the 63-series features substantially thickened ring cross-sections, significantly larger rolling elements (balls), and deepened raceways. This specific geometric design delivers superior basic dynamic load ratings and exceptionally high static shock resistance effectively protecting raceways against Brinelling deformation during abrupt torque spikes.
This product's engineering architecture integrates three decisive attributes: P6 Precision Class (ISO 492 / ABEC-3 equivalent) for tight radial runout limits and vibration attenuation; C3 Internal Radial Clearance to compensate for significant thermal expansion on the 55 mm drive shaft induced by high continuous operational loads; and dual 2RS contact seals manufactured from sheet-steel-reinforced Acrylonitrile Butadiene Rubber (NBR) to provide absolute exclusion of micro-abrasive dust and atmospheric moisture while permanently retaining factory grease.
Technical Designation Anatomy (FAGI 6311 2RS C3 P6)
Constructed with thickened raceway walls and extra-large balls, delivering peak radial capacity and bi-directional thrust support among single-row deep groove configurations.
Calculated via standard metric multiplier ($11 \times 5 = 55\text{ mm}$); fits heavy industrial electric motor drive-ends (DE) and robust pump shafts.
NBR elastomer contact seals reinforced with vulcanized internal steel inserts, preventing lubricant purging and guarding against slurry, cement dust, and washdowns.
Expanded internal radial play compared to normal (CN) to accommodate press fits on shafts (Interference Fits) and substantial thermal shaft expansion during operation.
Refined dimensional and rotational tolerance class (ISO Class 6 / ABEC-3) preventing rotational wobble, minimizing acoustic noise, and damping harmonics.
Dimensional, Mechanical & Metallurgical Specifications
| Technical Parameter | Value / Specification | Functional Mechanical Impact |
|---|---|---|
| Bore Diameter (d) | 55 mm | Rigid and concentric seating on heavy-duty 55 mm industrial drive shafts. |
| Outside Diameter (D) | 120 mm | Massive outer raceway footprint engineered for high radial load distribution into cast-iron housings. |
| Overall Width (B) | 29 mm | Substantial axial rigidity, supporting bidirectional dynamic thrust forces. |
| Precision Class | P6 (ISO Class 6 / ABEC-3) | Mitigates shaft runout and suppresses high-frequency rotational noise and vibration. |
| Radial Internal Clearance | C3 (Greater than Normal) | Eliminates risk of ball pinching or thermal seizure caused by thermal gradients between inner and outer rings. |
| Sealing Design | 2RS (Dual Steel-Reinforced NBR Contact Seals) | Zero-maintenance barrier against fluid spray, abrasive dust, and internal grease leakage. |
| Ring & Ball Metallurgy | 100Cr6 Chromium Bearing Steel (AISI 52100) | Through-hardened to 60–64 HRC with stable martensitic microstructure to withstand rolling contact fatigue (RCF). |
| Cage Material | Pressed Steel (Ribbon Type) | Precision ball spacing and dynamic stability under rapid acceleration and shock loading. |
Engineering Advantages & Operational Superiority of FAGI 6311 2RS C3 P6
1. Superior Load Rating in 63 Heavy Series
The massive 120 mm outer diameter accommodates extra-large balls, dramatically increasing dynamic radial capacity and shock tolerance far beyond equivalent 60 or 62 series units.
2. P6 Precision Tolerances
Refined ISO Class 6 tolerances prevent dynamic runout, protecting adjacent shaft seals, mechanical couplings, and secondary bearings from premature fatigue.
3. Thermal Compensation via C3 Clearance
Under continuous duty in enclosed motors where 55 mm shafts run hot, C3 clearance ensures the bearing maintains optimal operational radial clearance without binding.
4. Zero-Maintenance 2RS Contact Sealing
Factory-metered premium lithium soap grease protected by steel-reinforced NBR lip seals guarantees dependable lubrication and dust-tight operation over the entire service life.
Primary Industrial Applications & Target Equipment
- High-Power Medium-to-High Voltage Electric Motors (55 mm Shaft): Drive-end (DE) positions subject to high radial belt pulls and heavy direct-coupled loads.
- Jaw Crushers, Vibrating Screens & Ball Mills: Absorb severe shock loads and cyclic torsional impulses in mineral processing environments.
- Heavy-Duty Industrial Pumps & Boiler Feed Pumps: Continuous dynamic stability under continuous high-pressure hydraulic thrust.
- Helical & Planetary Reduction Gearboxes: Handle combined loads generated by high-torque gear meshes without ring deflection.
- Heavy Industrial Blowers & Clinker Cooler Fans: Provide reliable 24/7 service in high-dust cement and steel manufacturing plants.
Installation Directives & Workshop Warning (FAGI 6311 2RS)
The 6311 2RS bearing is pre-lubricated with a precision factory fill of high-performance grease. NEVER wash or rinse this bearing in diesel, thinners, gasoline, or degreasing solvents. Petroleum solvents will chemically degrade the NBR rubber seals, dilute the internal grease matrix, and lead to catastrophic bearing seizure within minutes of initial load application.
- Correct Press-Fit Protocol: Due to the 55 mm bore diameter, cold mechanical press mounting force must strictly be applied to the face of the inner ring only via a proper mounting sleeve. Transmitting pressing force through the outer ring will direct the load across the balls, creating permanent micro-dents (Brinelling) in the raceway.
- Induction Heating Temperature Limit: When utilizing an induction bearing heater for thermal expansion mounting, keep temperature strictly below 110°C (230°F). Exceeding this limit will permanently scorch the NBR contact seals and compromise the grease thickener. Open flame torch heating is strictly forbidden.
- Seal Protection: Do not pry or apply mechanical pressure with screwdrivers, drift pins, or hammer edges against the flexible rubber seal faces during assembly.
- Shaft & Housing Tolerance Audit: Inspect the 55 mm shaft seat tolerances (e.g., ISO k5 or m5 fits) and housing bore concentricity prior to assembly to preserve the bearing's P6 operational accuracy.
FAGI Metallurgical Integrity & Quality Assurance
Because 6311 series bearings are predominantly installed on critical primary-drive equipment, counterfeit or low-grade carbon-steel units invariably fail prematurely under heavy dynamic stress, causing cage fracture, raceway spalling, and costly production stoppages.
FAGI 6311 2RS C3 P6 bearings undergo thorough spectral analysis and structural quality control, utilizing through-hardened 100Cr6 bearing steel, verified ISO Class 6 tolerances, and dual NBR contact seals to guarantee continuous reliability under demanding industrial operating regimes.
Price Inquiries, Technical Consultation & Bulk Orders
Contact our engineering sales team for corporate pricing, metallurgical test certifications, and volume supply contracts.
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