Forged Camshaft Blanks & Assemblies
Shivam Forge manufactures precision forged camshaft blanks and rough-machined camshaft forgings for tractor diesel engines, truck engines, generator sets, marine engines, and industrial compressors. We forge in C45, 42CrMo4, EN18, and case-hardening grades with controlled normalising or Q&T, and supply journal OD-turned and lobe OD-rough-machined blanks ready for customer finish grinding.
A forged steel camshaft outperforms a chilled cast iron shaft in two critical areas: fatigue strength and dimensional repeatability. The closed-die forging process aligns grain flow along the cam lobe profile, resisting the cyclic Hertzian contact stress that causes spalling on cast surfaces. For applications running above 1800 rpm or using aggressive lobe profiles, forged steel is the only specification that delivers the service life the engine OEM warrants.
Camshaft forgings for 3- and 4-cylinder tractor diesels. Lobe profiles for Mahindra, Eicher, Tafe, John Deere India engine types. Material C45 or 42CrMo4. Normalised or Q&T per engine builder specification.
Multi-cylinder truck diesel camshaft forgings for Tata, Ashok Leyland, and VECV platforms. Longer shaft forgings (up to 600 mm) in 42CrMo4 with full-length journal turning and lobe rough machining.
Camshaft blanks for 10–500 kVA generator engines. Constant-speed operation (1500 or 1800 rpm) demands consistent lobe geometry — our closed-die process holds lobe profile within ±0.5 mm of nominal before finish grinding.
Forged camshafts for auxiliary marine diesel engines and main propulsion engines up to medium bore. DN certification documentation available. Material 42CrMo4 QT for high-cycle marine service.
Camshaft and eccentric forgings for reciprocating air and gas compressors. Complex lobe geometry controlling valve timing. Induction hardening of lobe surfaces to 55–60 HRC on request.
Small-diameter camshaft forgings for two-wheeler and three-wheeler engines. High-speed operation requires tight journal OD tolerances — we rough-turn journals to within 0.2 mm of finish size. C45 or 20MnCr5 for case hardening.
Billets procured from SAIL, Electrosteel, or Mukand with mill chemical certificates. Carbon, manganese, chromium, and molybdenum verified against grade specification before forging. Heat numbers carried through all process records.
Camshaft blank forged in multi-impression closed dies. Lobe positions forged to near-net profile — typically 3–5 mm stock on lobe face for finish grinding. Journal diameters forged to within 5–8 mm of finish size for rough-turning efficiency.
Normalising at 850–900°C for C45 grade to achieve uniform pearlitic microstructure (220–260 HB). Q&T for 42CrMo4 to specification — typically 850–950 MPa UTS, 280–320 HB. Hardness tested on each batch with Brinell indenter.
Journals rough-turned on CNC lathe to within 0.2 mm of finish size. Lobe OD rough-machined to profile with 1–2 mm grinding stock. Thrust face, end features, and drive features machined per drawing. Straightness checked on V-blocks after turning.
All camshaft forgings and rough-machined blanks inspected by wet fluorescent magnetic particle testing. Journal surfaces and lobe roots — the highest-stress locations — receive focused inspection. Any crack indication results in rejection.
Dimensional inspection report covers: journal OD, journal runout, lobe lift (base circle to peak), base circle diameter, lobe-to-lobe angular spacing, and overall shaft length. Results against drawing tolerance provided with each delivery.
Medium-carbon C45 (080M46, IS 1570 C45) is the baseline camshaft material for low-speed and light-duty applications. Normalised UTS 580–700 MPa. Low cost, good machinability. Suitable for two-wheelers, pumps, and small generators.
42CrMo4 (1.7225 per EN 10083-2) in Q&T condition gives UTS 950–1100 MPa and impact energy 40–60 J at 0°C. The standard choice for tractor and truck diesel camshafts operating at 1500–3000 rpm.
EN18 chromium steel with Q&T treatment provides UTS 1000–1200 MPa. Used for larger bore diesel engines and compressor camshafts where 42CrMo4 properties are marginal. Certified to BS 970 / IS 4432.
20MnCr5 (1.7147) billet for camshafts requiring case-hardened lobe surfaces. We forge the blank; customer performs carburising and induction hardening. Surface hardness 58–62 HRC after treatment. Common for motorcycle and high-revving generator cams.
31CrMoV9 (1.8519) for camshafts requiring gas or plasma nitriding of journals and lobes. Nitriding layer 0.2–0.4 mm, surface hardness 900–1050 HV. Excellent wear resistance with no dimensional change risk during heat treatment.
Lobe geometry — base circle diameter, maximum lift, opening/closing ramp shape, and angular position — is entirely controlled by the customer's engine drawing. We review forgability of the profile and confirm die design before tooling production.
Forged steel camshafts outperform chilled cast iron in every high-cycle application. The forging process creates continuous grain flow from journal to journal through each cam lobe — the critical load path for Hertzian contact fatigue. Cast iron relies on randomly distributed carbide particles for hardness, which works adequately at low rpm but degrades rapidly under high valve spring pressure or aggressive lobe profiles. Engine rebuilders and OEMs who switch from cast iron to forged steel camshafts consistently report longer service intervals and fewer warranty claims for tappet and lobe wear.
Our closed-die forging capability for camshafts covers shaft lengths from 120 mm (small engine two-cylinder) to 650 mm (six-cylinder truck engine) and lobe profile sizes from 28 mm base circle to 75 mm maximum diameter. Lobe positions are forged to near-net with 3–5 mm stock on the lobe face and 5–8 mm on journal ODs. Multi-impression tooling controls lobe angular spacing to within ±0.5° during forging. Journals and lobe ODs are then rough-turned in-house before despatch, ready for the customer's finish grind operation.
Grade selection for camshafts follows the engine duty. C45 (EN8) in normalised condition suits two-wheelers and low-speed generator engines running below 1800 rpm. Tractor and truck diesel camshafts are specified in 42CrMo4 (EN19) quenched and tempered — UTS 950–1100 MPa, impact energy 40 J at 0°C. EN18 (722M24) covers higher-tensile requirements for large bore diesels and compressor applications. Where surface hardness beyond 55 HRC is needed, we forge in case-hardening 20MnCr5 for carburising, or nitriding grade 31CrMoV9 for plasma nitriding.
Inspection of camshaft forgings covers both internal integrity and dimensional conformance. Magnetic particle inspection (wet fluorescent, ASTM E709) checks journal surfaces and lobe root radii — the highest-stress locations — for surface cracks, forging laps, or seams. Dimensional report confirms journal OD, runout, base circle diameter, lobe lift, lobe-to-lobe angular spacing, shaft straightness, and overall length against drawing tolerances. These results accompany every delivery batch.
Shivam Forge supplies camshaft forgings from Rajkot to tractor manufacturers, engine rebuilders, generator OEMs, and marine equipment companies across India, with export to UAE, East Africa, and Europe. New part development tooling takes 4–6 weeks from drawing approval to first sample. Serial production lead time on established tooling is 3–4 weeks. Contact us at +91-9265772827 or sales@shivamforge.com with your camshaft drawing and required quantity for a quotation within 24 hours.
A forged steel camshaft has aligned grain flow through the lobe profile, giving 30–50% better fatigue strength than a chilled cast iron equivalent under Hertzian contact loading. Cast iron camshafts rely on carbide distribution for wear resistance but are brittle under impact and can pit after high mileage. Forged steel camshafts — typically C45 or 42CrMo4 — tolerate higher lobe lifts, higher spring pressures, and longer service intervals.
42CrMo4 (EN19) in Q&T condition is the standard choice for tractor diesel camshafts. It gives UTS of 950–1100 MPa, good hardenability for shaft diameters up to 80 mm, and excellent fatigue life at 1500–2200 rpm. For smaller tractor engines with lighter valve spring loads, C45 normalised may be adequate.
We forge near-net lobe profiles — lobe faces are forged to within 3–5 mm of the finish grind size and journal diameters to within 5–8 mm. We then rough-machine journals and lobe ODs in-house. The customer performs finish grinding of the lobe profile and final journal sizing.
Yes. If you specify 42CrMo4 or EN18 material, lobe and journal surfaces can be induction-hardened to 55–60 HRC after rough machining. For case-hardening grades (20MnCr5), the blank goes out for carburising and quenching. We identify the appropriate route based on your engine specification.
Yes. We supply camshaft forgings for generator diesel engines from 10 kVA to 500 kVA output. Generator engines run at constant 1500 or 1800 rpm — consistent lobe geometry is critical for injection or valve timing accuracy. Our closed-die process holds lobe position within ±0.5° angular and ±0.5 mm profile.
Tooling (die) production for a new camshaft part takes 4–6 weeks from drawing approval. First-article forgings are available 2–3 weeks after tooling. Serial production batches ship in 3–4 weeks from confirmed order. Repeat orders on existing tooling ship in 2–3 weeks.
For first-article and development work, we accept quantities from 10–25 pieces. Serial production MOQ is typically 50–200 pieces per part number depending on camshaft complexity and the tooling amortisation arrangement.
Send your engine drawing or camshaft drawing (PDF or STEP), material specification, lobe profile data if separate, required quantity, and delivery requirements to sales@shivamforge.com. We confirm receipt within 2 hours and return a quotation within 24 hours. Call +91-9265772827 for urgent requirements.
Why Choose Shivam Forge
Shivam Forge delivers precision hot-forged components from our integrated Shapar, Rajkot facility — covering forging, CNC machining, heat treatment, and quality inspection under one roof.
