Cylindrical Roller Bearing Introduction
11 month ago
Product details
1. Core Advantages
Superior Radial Load-Carrying Capacity: Double rows of rollers make line contact with raceways, and the radial rated dynamic load is over 60% higher than that of single-row models. It can bear heavy loads and impact loads, suitable for heavy-duty equipment.
High Radial Rigidity: The two rows of rollers are symmetrically distributed for balanced force transmission, with radial rigidity 50% higher than single-row types, reducing deformation of spindles or transmission shafts.
Wide Speed Adaptability: Equipped with a double-row cage to separate rollers, the limiting speed reaches 6000r/min, meeting both heavy-load and medium-high speed requirements.
2. Key Features
Structure: Composed of outer ring, inner ring, double-row cylindrical rollers, and double-spacer cage; some models come with double-sided seals/dust covers.
Rollers: Diameter 5-25mm, length-to-diameter ratio 1.1-2.2, hardness HRC 60-64, surface roughness Ra ≤ 0.08μm.
Precision: Regular grades P0/P6, precision models up to P5; radial clearance adjustable by working conditions (Class C2-C4).
3. Core Manufacturing Processes
Rollers: Bearing steel (SUJ2) undergoes cold heading → quenching → centerless grinding → superfinishing, with cylindricity ≤ 0.002mm.
Rings: Forging → turning → heat treatment → synchronous grinding of double raceways, with raceway parallelism ≤ 0.003mm.
Assembly: Double-row roller sorting → synchronous needle installation in cage → clearance inspection to ensure uniform force on both rows.
4. Usage Method
Installation: Inner ring hot-fitted (80-110℃), outer ring cold-pressed into bearing housing; fit tolerances: journal m6, housing bore H7. Single-row force bearing is prohibited.
Lubrication: Open-type models filled with extreme-pressure lithium-based grease (1/2-2/3 of internal space), re-greased every 1500-3000 hours; sealed models have longer maintenance-free periods.
5. Application Scope
Covers wind turbine spindles, rolling mill work rolls, large motor rotors, crane drums, etc., suitable for heavy machinery and precision equipment requiring heavy load and high rigidity.
6. Precautions
Axial loads are prohibited; use with thrust bearings if needed. Ensure uniform contact between double-row rollers and raceways during installation.
Install protective covers in dusty environments; regularly check cage integrity to avoid roller skew and jamming.
7. Packaging and Transportation
Individual Packaging: Rigid plastic box + anti-rust paper; Bulk Packaging: Corrugated boxes with EPE foam partitions, each ≤ 25kg.
Avoid stacking over 2 layers during transportation; store in dry warehouses with 12-month shelf life. Check anti-rust conditions every 6 months.
Case Study: German CNC Machine Builder - Bavaria, Germany
Customer Background:
Mid-sized CNC machining center manufacturer near Munich, producing 120+ machines annually for European automotive supply chain.
Before Redmay Bearing (2023):
❌ Spindle bearing failure rate: 8.7% during warranty period
❌ Average downtime per failure: 4.2 days
❌ Annual warranty cost: €127,000
❌ Customer complaint rate: 11.3%
After Switching to Redmay DIN Standard Bearings (2024):
✅ Bearing failure rate: 0.8% (91% reduction)
✅ Zero warranty claims in first 8 months
✅ Annual warranty cost saved: €116,000
✅ Customer satisfaction improved to 98.6%
✅ Production efficiency increased by 12.4%
"The dimensional consistency of Redmay's bearings matches what we previously paid 3× more for from German brands. Our quality department hasn't rejected a single batch in 10 months."
— Markus Weber, Production Director, Munich Precision Machinery GmbH
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Dalian Redmay bearing import & Export Co., Ltd.
Audited supplier
13 month
Main Product:
bearing,
thrust bearing,
spherical roller bearing,
railway bearing ,
cylindrical roller bearing,
Mechanical processing