6306‑2RS1/C3GJN Deep Groove Ball Bearing 30x72x19 Double Contact Rubber Seal C3 Polyurea Grease

1. Product Overview

6306‑2RS1/C3GJN is single‑row deep groove ball bearing, dimension 30 mm bore × 72 mm OD × 19 mm width.
Suffix explanation:
‑ 2RS1: Double‑sided nitrile rubber contact lip seals, block fine dust, moisture and splashing liquid, retain internal lubricant, maintenance‑free construction, non‑relubricatable.
‑ C3: Enlarged radial internal clearance, compensates thermal expansion under high‑speed and high‑temperature operating conditions, prevents bearing seizure.
‑ GJN: Factory pre‑filled polyurea‑based high‑temperature grease, suitable for wide‑range temperature working environment, good anti‑oxidation and long service‑life performance.

Adopt deep raceway structure, can bear bidirectional radial load plus moderate bidirectional axial load. Stamped steel riveted cage separates GCr15 chrome‑steel balls for low‑friction, low‑noise running. Whole rings are fully quenched bearing‑steel. Widely used for high‑temperature industrial motors, centrifugal fans, water pumps, reducers, agricultural machinery and general‑purpose equipment with obvious temperature rise.

2. Technical Specifications

Mounting‑shoulder drawing, grease performance introduction and performance test reports can be provided upon customer request.

3. Core Advantages

• C3 enlarged internal clearance: Reserve expansion allowance for thermal growth of shaft and rings, effectively avoid jamming and abnormal wear under high‑speed, high‑temperature working status.
• 2RS1 double‑sided contact rubber lip seals: Excellent barrier against fine dust, humidity and splash liquid; keep polyurea grease inside bearing for long‑term maintenance‑free service.
• GJN polyurea high‑temperature grease: Outstanding thermal‑oxidation stability, works reliably within wide temperature range, less grease degradation for motor‑class continuous operation.
• Classic deep‑groove ball‑bearing structure, bears radial load and moderate bidirectional axial load, fits composite‑load transmission shafts of general‑purpose equipment.
• Super‑finished raceway and steel‑ball surface, low vibration & low‑noise performance, stable continuous‑running performance for motor‑class equipment.
• GCr15 overall quenched steel, stable metallographic structure, good anti‑fatigue and wear‑resistant performance for cyclic working conditions.
• Stamped‑steel riveted cage, light‑weight and high rigidity, evenly distribute rolling‑element stress and lower high‑speed noise.
• Standard ISO metric dimension, fully interchangeable with global 6306‑2RS1/C3GJN bearings, direct replacement without modifying original housing. Rich custom options: P0/P6/P5 precision grade, alternative grease types, stainless‑steel variant, OEM outer‑ring laser marking, neutral export anti‑rust carton.

4. Application Scenarios

6306‑2RS1/C3GJN C3‑clearance polyurea‑grease sealed deep‑groove ball bearing is maintenance‑free rotary support spare‑part for 30 mm‑shaft machinery with high‑temperature and dusty requirements:

• High‑temperature industrial three‑phase motors, generator rotor bearing assemblies
• Centrifugal fans, hot‑air circulating fan main‑shaft bearing units
• Hot‑water pumps, hydraulic‑pump transmission rotating components
• Reducer input/output shafts with notable temperature rise
• Agricultural harvesters, textile‑machinery high‑temperature roller transmission bearings
• General‑purpose industrial equipment working in dusty and humid workshop conditions

Aftermarket interchangeable 6300‑series C3 polyurea‑grease sealed deep‑groove ball bearing
High‑temperature dust‑proof bearing solution for motor manufacturers, fan/pump OEMs and industrial‑equipment bulk‑maintenance procurement.

5. Why Choose GQZ Bearing

• 25‑years manufacturing experience of 6300‑series deep‑groove ball bearings including 6306‑2RS1/C3GJN.
• 6306‑2RS1/C3GJN is dimension‑for‑dimension interchangeable with international‑standard counterparts, consistent load‑rating, C3 clearance tolerance, 2RS1 sealing and GJN polyurea‑grease filling standards.
• Complete OEM & ODM custom service covering multi‑precision‑grade, alternative grease formulas, stainless‑steel material and special‑processing requirements.
• Strict pre‑shipment QC: GCr15 raw‑material metallurgy & hardness inspection, steel‑ball sorting, long‑cycle high‑speed temperature‑rise rotation aging test, humidity‑dust environment wear‑simulation test.
• Professional bearing engineering team provides one‑on‑one load‑matching calculation, shaft‑housing fit‑tolerance guidance and high‑temperature application tips within 24 working hours.
• Large‑scale production workshop offers competitive factory‑direct bulk‑wholesale price, stable long‑term supply for global motor, fan, pump and general‑machinery spare‑part buyers.
• We focus on C3‑clearance high‑temperature polyurea‑grease sealed deep‑groove ball‑bearings, 2RS1 contact‑lip sealing design, ISO‑standard metric dimensions, pursuing win‑win long‑term cooperation with high‑temperature industrial‑transmission‑equipment suppliers.

6. Quality Control

• Raw‑material chemical‑composition, internal‑defect and hardness inspection for GCr15 inner‑ring, outer‑ring and steel‑ball blanks
• Precision turning, multi‑time stress‑relief tempering, ultra‑precision super‑finish grinding for deep raceway surface
• Steel‑ball high‑temperature quenching, mirror‑polishing and high‑precision auto‑sorting production‑line
• Stamped‑steel‑cage stamping‑riveting, 2RS1 rubber‑seal press‑fitting, quantitative GJN polyurea‑grease filling assembly
• Targeted performance‑tests: 6306‑2RS1/C3GJN long‑cycle high‑temperature high‑speed rotation aging test, humidity‑dust sealing‑durability test, variable‑load anti‑fatigue wear‑detection
• Full re‑check for dimension‑tolerance, C3 clearance value, raceway surface‑finish and sealing tightness before anti‑rust‑oil coating and export moisture‑proof‑carton packing.

Each production batch of 6306‑2RS1/C3GJN undergoes high‑temperature motor‑simulation cyclic‑rotation test to guarantee stable low‑noise dust‑proof rotary‑support performance for 30‑mm‑shaft high‑temperature industrial‑transmission‑systems.

7. Get A Quote Now

If you need 6306‑2RS1/C3GJN 30x72x19 C3‑clearance polyurea‑grease double‑contact‑rubber‑seal deep‑groove ball bearings for high‑temp motor/fan manufacturing, transmission‑shaft‑assembly and industrial‑equipment‑maintenance bulk‑matching, send your purchase‑inquiry directly.
Full professional supporting‑services after inquiry submission:

• Official formal quotation reply within 24 working‑hours
• One‑on‑one radial‑&‑axial‑load‑matching calculation, shaft‑housing‑fit‑tolerance guidance and high‑temperature‑application technical‑support from professional‑bearing‑engineers
• Custom‑bearing‑performance‑upgrade options including multi‑precision‑grade and alternative special‑grease
• Favorable factory‑direct bulk‑wholesale price for large‑volume 6306‑2RS1/C3GJN single‑model‑orders

Please provide purchase‑quantity, working‑conditions (high‑temperature / dust‑humidity / vibration) and continuous‑operating‑temperature to get detailed official‑quotation‑documents.

8. FAQ