Crankshaft Induction Hardening
Maximize engine performance with precision-controlled journal and fillet hardening. We deliver high-cycle fatigue resistance and extreme hardness for automotive and industrial crankshafts.
Crankshafts are the most critical rotating components in any engine. At Thakur Industries, we specialize in high-accuracy induction heat treatment that targets bearing journals and pin areas. Our process ensures a hard martensitic surface for wear resistance while maintaining the fillet toughness required to prevent engine-destroying fatigue cracks.
Journals & Fillets
Effective crankshaft hardening requires more than just high HRC levels. We focus on the Transition Zone.
- Journal Hardening: HRC 52–60 for superior bearing life.
- Fillet Hardening: Precision heating to enhance fatigue resistance.
- Oil Hole Protection: Preventing cracks at lubrication points.
- Core Integrity: Preserving ductility for high-RPM stability.
Our Workflow
Stress Relieving
Thermal stabilization before the main hardening cycle to ensure zero micro-cracks.
Induction Cycle
Programmable digital heating of main and big-end journals using module-specific coils.
Quench Control
Advanced polymer quenching to achieve uniform hardness without quenching cracks.
Precision Tempering
Relieving residual stresses to enhance toughness and prevent service failure.
Straightening
Post-heat correction to within ±0.05mm runout using specialized hydraulic jigs.
Final Balancing
Verification of dynamic balance and journal concentricity for high-performance use.
Technical Specs
We deliver OEM-grade standards for automotive, agricultural, and power generation engines:
- Hardness: 52-62 HRC (Material dependent)
- Case Depth: 1.5mm to 4.0mm deep penetration
- Runout: Within 0.05mm after straightening
- Surface Finish: Compatible with final micro-grinding
- Materials: EN19, EN24, 4340, Forged Carbon Steels
Industry Focus
Automotive Engines
Passenger and commercial vehicle crankshafts.
Diesel Gensets
Heavy-duty power generation components.
Industrial Pumps
High-pressure pump shafts and crankshafts.
Other Services
// PROCESS //
Our Process
Crankshaft Inspection
We verify journal dimensions, oil passage locations, material grade (EN24/4340), and define the hardening zones to avoid bearing surfaces.
Selective Induction Hardening
Custom scanning coils harden the crankpin and journal surfaces to 50–58 HRC while masking sensitive areas with copper shields.
Distortion Check & Certification
Dimensional inspection for straightness, hardness verification on all journals, and certificated dispatch within 3–5 days.
Hardening FAQs
Ready to Harden Your Quality?
Contact us for a free consultation. Send your component details or drawings and get a quick quotation within 24 hours.