6303LLB Single Row Deep Groove Ball Bearing Double LLB Non-Contact Nitrile Rubber Seal 17x47x14mm Motor Agricultural Conveyor Equipment

The 6303LLB single row deep groove ball bearing adopts double-sided LLB non-contact nitrile rubber labyrinth seals, standard dimension 17×47×14mmNSK. The LLB seal forms micro labyrinth clearance without touching inner raceway, combining ultra-low rotation torque, high limit speed and excellent fine dust blocking capacity. It bears radial load and slight bidirectional axial load, pre-filled long-life lithium lubricating grease, widely used in high-speed electric motors, agricultural harvesters, conveyor rollers, handheld power tools and general industrial rotary assemblies requiring quiet low-friction continuous operation.

• LLB non-contact labyrinth rubber seal: no friction contact with inner ring, limit speed close to open bearing, much higher than contact LLU/2RS seals
• Double-layer labyrinth barrier effectively blocks crop dust, fiber and tiny particles, prevents internal grease leakage for long maintenance-free service
• 6300 series large steel ball layout delivers higher radial load capacity than 60/62 series bearings with same bore size
• Precision superfinished raceway and steel balls realize ultra-low noise, stable vibration-free continuous high-speed rotation
• Nitrile rubber seal maintains stable elasticity under wide temperature range, suitable for dry dusty workshop environment
• Multiple interchangeable variants: open 6303, dust-proof metal shield 6303ZZ, splash contact sealed 6303LLU/6303-2RS, C3 clearance version
• Stainless steel anti-rust model can be customized for damp light-corrosion working conditions

This LLB non-contact sealed deep groove bearing is widely matched to:

• High-speed electric motors, fan rotors and small generator support assemblies
• Agricultural harvesters, lawn trimmers and farm vehicle transmission parts
• Conveyor transport rollers, packaging machinery and light construction rotary equipment
• Handheld power tools, small water pumps and textile machine auxiliary rollers

• 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 dust resistance & low torque test, clearance grouping and full dimensional recheck
• Anti-rust oil treatment and carton bulk packaging before delivery