6304LLB Single Row Deep Groove Ball Bearing Double Sides LLB Non-Contact Nitrile Rubber Seal 20x52x15mm High Speed Motor Equipment

The 6304LLB single row deep groove ball bearing adopts double-sided LLB non-contact nitrile rubber labyrinth seals, standard dimension 20×52×15mm. LLB non-contact seal creates labyrinth clearance without touching inner ring raceway, combining high dust resistance and ultra-low rotation torque, supports radial load and bidirectional slight axial load. Pre-filled long-life grease inside, suitable for high-speed motors, conveyors, agricultural machinery and general industrial rotating assemblies requiring quiet low-friction operation.

• LLB non-contact labyrinth rubber seal: no friction contact with inner ring, far higher limit speed than contact LLU/2RS seals
• Double-layer labyrinth structure blocks fine dust and particles, effectively lock internal lubricating grease
• Large ball layout of 6300 series delivers stronger radial load capacity than 62/60 series same bore bearings
• Superfinished raceway and steel balls ensure ultra-low noise, smooth stable high-speed rotation
• Nitrile rubber seal maintains stable elasticity under wide temperature range, long service life
• Multiple optional variants: open 6304, metal shield 6304ZZ, contact sealed 6304LLU/6304-2RS, C3 clearance
• Stainless steel anti-rust version can be customized for damp and light corrosive working environments

This LLB non-contact sealed deep groove bearing is widely applied in:

• High-speed electric motors, fan rotors and generator support assemblies
• Agricultural harvesters, garden power tools and farm vehicle transmission parts
• Conveyor rollers, packaging machinery and light construction rotary equipment
• General textile machinery, small water pumps and household power tool spindles

• 25+ years experience in LLB non-contact sealed deep groove ball bearing manufacturing
• Exported to 50+ countries worldwide
• Rich OEM bulk order experience for 6300 series LLB low torque high-speed bearings
• Strict seal labyrinth tightness, rotation torque and high-speed durability inspection before shipment
• Fast professional technical reply within 24 hours
• Stable mass supply for long-term motor and agricultural machinery factory cooperation

• GCr15 bearing steel raw material incoming hardness inspection
• Ultra-precision grinding for inner & outer raceway and large steel balls
• Standard quenching & tempering heat treatment for uniform surface hardness
• LLB seal labyrinth dust resistance & low torque test, clearance grouping and full dimensional recheck
• Anti-rust oil treatment and carton bulk packaging before delivery