Manufactured to Strict International Tolerances
At Darshak Bearing Co, our efforts are focused on manufacturing bearings to international standards for the utmost satisfaction of our OEM and aftermarket customers.
A bearing's performance in high-speed and heavy-load conditions is defined by its dimensional integrity, raceway micro-geometry, and material endurance. We integrate multi-point quality control at every stage — from raw steel inspection through CNC machining, heat treatment, super-finishing, to final acoustic testing.
Component Sourcing Standard: Rolling elements (high-precision steel balls and rollers) and specialized cages are procured exclusively from certified, tier-1 reputed manufacturers.
The 3 Parameters of Bearing Excellence
How every Darshak Bearing is engineered, measured, and verified before shipment.
Geometrical Accuracies
Precision Gauging at Every Manufacturing StageTo maintain stringent geometrical accuracies, inner and outer races are measured at every stage of manufacture by regularly calibrated measuring instruments, air gauges, and dial indicators. We ensure every race is machined, ground, and finished to internationally recognized ISO tolerances.
Key Verification Steps
- Inner and outer ring raceway concentricity & roundness control
- Regularly calibrated master gauges and micrometers
- Strict control over radial and axial runout limits
- Sourced precision cages and rollers from certified tier-1 vendors
Ultra-Low Noise Level
Super-Finishing & Profilometer GeometryNoise and vibration levels directly correlate to the surface roughness and geometry of mating surfaces. Our super-finishing operations receive maximum technical attention. Clearances are calibrated to international clearance classes (CN, C2, C3, C4) by matching all mating parts using customized electronic gauging fixtures.
Key Verification Steps
- Super-finishing honing on raceway tracks for mirror finish
- Profilometer surface roughness (Ra / Rz) analysis
- 100% vibration and acoustic noise frequency testing
- Optimal roller-to-raceway contact profile to minimize friction
Extended Bearing Life
SAE 52100 High-Carbon Chromium Alloy SteelOperational fatigue life depends on the quality of alloy steel and heat treatment. Special care is taken to source exclusively 100% prime SAE 52100 / 100Cr6 grade bearing steel from reputable steel mills. Heat treatment is continuously supervised by testing core microstructure and Rockwell hardness (HRC 60-64) at defined intervals.
Key Verification Steps
- 100% SAE 52100 / 100Cr6 certified clean bearing steel
- Controlled atmosphere heat treatment for fine martensitic structure
- Regular metallurgical spectrometry & inclusion rating tests
- Optimal surface hardness (60–64 HRC) resisting subsurface shear fatigue
Premium SAE 52100 Grade Alloy Steel
Bearing longevity is fundamentally dictated by clean steel chemistry and controlled heat treatment. We exclusively utilize SAE 52100 (100Cr6) high carbon chromium alloy steel.
- Spectro Analysis: Verifies exact Carbon (0.98–1.10%) and Chromium (1.30–1.60%) composition.
- Hardness Testing: Controlled heat treatment maintaining 60 to 64 HRC across raceways.
- Microstructure Examination: Uniform fine martensitic matrix free from harmful carbides.
SAE 52100 Steel Specification Breakdown
| Element | Standard (%) | Function |
|---|---|---|
| Carbon (C) | 0.98 - 1.10% | High hardness & wear resistance |
| Chromium (Cr) | 1.30 - 1.60% | Hardenability & corrosion resistance |
| Manganese (Mn) | 0.25 - 0.45% | Increases tensile strength |
| Silicon (Si) | 0.15 - 0.35% | Deoxidizer & elastic limit boost |
| Hardness | 60 - 64 HRC | Optimal fatigue life |
R&D Department: Application Selection & Fitment Support
Our dedicated Research & Development department actively assists customers in selecting the right type and clearance of bearing depending on operating load, speed, lubrication, and environmental temperature.
Application Selection
Assisting OEM designers and plant maintenance engineers in calculating dynamic load ratings (C) and expected L10 life hours.
Fitment Technique Guidance
Preventing premature damage caused by improper mounting techniques, incorrect shaft fits, or excessive hammering during installation.
Metallurgical Lab Reports
Supplying comprehensive form, size, surface roughness, and metallurgical certificates to substantiate quality compliance.