Forged Crankshafts
The crankshaft carries every firing load in an engine and turns it into usable torque while resisting torsional vibration. Forged crankshafts remain the standard for diesel and heavy-duty service because the process aligns grain around each web and fillet where stress concentrates.
- Shaft Length
- Up to 1,200 mm
- Weight Range
- 2 kg – 120 kg
- Materials
- 42CrMo4, EN24, EN19
- Journal Hardness
- 50 – 58 HRC induction
- Core Hardness
- 250 – 320 BHN
- Balancing
- Dynamic, to specified g-cm
Forged Crankshafts at a glance
Quotable facts from Avadh Techno Forge, Gundasara, Gondal, Rajkot.
- Shaft Length: Up to 1,200 mm
- Weight Range: 2 kg – 120 kg
- Materials: 42CrMo4, EN24, EN19
- Journal Hardness: 50 – 58 HRC induction
- Core Hardness: 250 – 320 BHN
- Balancing: Dynamic, to specified g-cm
Fillet Stress Is Where Crankshafts Break
Almost all crankshaft failures start at the journal-to-web fillet. Forged grain flow bends around that fillet instead of being cut through it, and fillet rolling or induction hardening adds compressive residual stress exactly where the crack would otherwise start.
- Grain flow wrapped around webs
- Fillet radii preserved, not machined through
- Induction-hardened journals
- Balanced within specified g-cm
Grades and Hardness
42CrMo4 and EN24 quenched and tempered to 250–320 BHN cover most industrial and automotive duty. Journals are induction hardened to 50–58 HRC with a controlled case depth, leaving a tough core that absorbs torsional shock.
Machining, Balancing and Inspection
Journals are ground to size and surface finish, oil holes drilled and chamfered, and each shaft is dynamically balanced. Magnetic particle inspection and hardness survey precede release, with reports carrying the heat number.
People also ask
What hardness are crankshaft journals?
50 to 58 HRC induction hardened, with a controlled case depth over a tough 250 to 320 BHN core.
Can you make a crankshaft from a worn sample?
Yes, through reverse engineering — the sample is measured, spectro analysed and re-drawn for your approval before manufacture.
Topics covered on this page
- forged crankshaft manufacturer India
- crankshaft forging supplier
- crankshaft manufacturer Rajkot
- diesel crankshaft India
Based on work carried out at our own forging plant at Gundasara, Gondal, Rajkot — operating since 2008.
Questions Answered
What is the largest crankshaft you can forge?
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Up to 1,200 mm length and 120 kg forged weight on the current line.
Do you induction harden journals?
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Yes, to 50–58 HRC with a controlled case depth, followed by grinding to final size.
Is dynamic balancing included?
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Yes, crankshafts are dynamically balanced to the customer's specified residual unbalance.
Can you make a crankshaft from a worn sample?
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Yes, through our reverse engineering route — the sample is measured, spectro analysed and re-drawn before manufacture.