Deep Groove Ball Bearing 6308 Type

Description

1. Product Overview

Deep Groove Ball Bearing 6308 Type is a precision-engineered radial ball bearing designed for medium-duty rotational applications. It delivers low-friction, high-speed capability with reliable radial and moderate axial load support, making it ideal for electric motors, gearboxes, pumps, fans, and general industrial machinery. The key value proposition is consistent, long-life performance under variable loads and speeds, reducing downtime and total cost of ownership. Strategically, the 6308 family is a standardized, globally available component that simplifies inventory management and supports rapid equipment maintenance and scale-up in industrial operations.

2. Key Specifications & Technical Characteristics

• Bearing type: Single-row deep groove ball bearing (6308 series)

• Bore diameter: 40 mm

• Outer diameter: 90 mm

• Width: 23 mm

• Dynamic load rating (Cr): typically 33–36 kN (model-dependent)

• Static load rating (Cor): typically 19–21 kN (model-dependent)

• Limiting speed: up to ~6,000–7,000 rpm (grease-lubricated; application dependent)

• Material: High-grade bearing steel (e.g., AISI 52100 / GCr15), case-hardened and through-ground raceways

• Cage options: Pressed steel, polyamide (glass-filled), brass available on request

• Internal clearance: C0 / C2 / C3 options available to suit thermal and load conditions

• Sealing options: Open, single-sealed (RS), double-sealed (2RS), metal shield (ZZ)

• Lubrication: Factory pre-lubricated with high-performance grease; re-lubrication ports available in specific housings

• Surface finish: Precision-ground raceways and balls to ISO/ABEC or ISO tolerance classes (e.g., P6/P5 available)

• Hardness: Raceway hardness typically HRC 60–64 after heat treatment

• Corrosion-resistant variants: Stainless steel (AISI 440C) and additional coatings (zinc, black oxide, ceramic balls) available on request

• Packaging options: Industrial-strength protective packaging: individual boxes, bulk cartons, palletized crates, 20 ft/40 ft container-ready packing with desiccants and anti-corrosion film

• Shelf life: Indefinite for dry-stored, sealed bearings; recommend storage in original sealed packaging at 5–35°C, relative humidity <65% and away from corrosive atmospheres

3. Core Industrial Applications

• Electric motors and generators: Primary use for rotor shafts and stator supports where high-speed, low-vibration performance is essential.

• Gearboxes and reducers: Supports radial loads and incidental axial loads in transmission systems, improving torque transfer efficiency and service life.

• Pumps and compressors: Provides stable shaft support under continuous-operation conditions, reducing leakage and mechanical failures.

• Fans, blowers, and HVAC systems: Low-noise, balanced operation for continuous air-handling equipment.

• Material handling and conveyors: Robust service life under cyclical loading and misalignment tolerances.
  Why it outperforms alternatives:

• Versatility: Standardized dimensions and multiple sealing/clearance options make the 6308 easily adaptable to diverse operating environments.

• Efficiency: Low friction and precision tolerances reduce energy losses, lowering operating costs.

• Durability: Hardened raceways, controlled internal clearance, and tailored lubrication increase mean time between failures versus generic bearings.

• Cost-effectiveness: Wide availability and standardized design enable competitive pricing and simplified spare-part logistics.

4. Competitive Advantages

• Quality consistency: Manufactured to international bearing standards with tight dimensional and material controls; available to ISO/ABEC tolerance classes and certified on request.

• Supply reliability: Scalable production and regional inventory options reduce lead times; consolidated shipping solutions for large-scale procurement.

• Logistics capability: Packaged and palletized for safe container loading; 20 MT pallet loads optimized for 20 ft/40 ft container configurations; export documentation support (COO, packing list, commercial invoice).

• Price competitiveness: Standardized series and multiple sourcing options deliver cost advantages at volume while maintaining performance.

• Sustainability: Options for longer-life lubrication and corrosion-resistant materials reduce replacement frequency and waste; packaging optimized for reuse and reduced emissions in bulk shipments.

• Technical support: Detailed dimensional drawings, bearing life calculation assistance, installation and maintenance guidelines, and engineering consultation available to support integration and predictive maintenance programs.

5. Commercial & Supply Information

• Minimum order quantity (MOQ): BULK 20 MT

• Loading capacity (MT per container):

  • 20 ft container: up to approximately 20 MT (subject to packing density and pallet configuration)

  • 40 ft container: up to approximately 24–26 MT (subject to packing density and pallet configuration)

• Lead times and availability: Standard stock items typically ship within 2–4 weeks for bulk orders; expedited production and inventory allocation available for contracted volumes.

• Packaging: Palletized, container-ready packing with anti-corrosion measures and export documentation.

• Ordering terms: FOB / CIF / DAP available by negotiation; volume discounts and long-term supply agreements supported.