Forged Steel Shafts — Transmission, Drive, Spline & Hollow
Shivam Forge manufactures precision forged steel shafts for automotive, agricultural, industrial and power transmission applications from its Shapar, Rajkot facility. Our shaft range covers transmission shafts, drive shafts, spline shafts, hollow shafts, stepped shafts, PTO shafts and propeller shafts in EN8, EN24, EN19, SAE 4140 and SAE 4340 — with in-house CNC turning, spline cutting, grinding and heat treatment delivering finished shafts to IT6/IT7 tolerances.
The difference between a forged shaft and one turned from bar stock shows up in fatigue life, not initial hardness. Forging aligns the steel's grain flow along the shaft axis and around keyways, splines and shoulders — exactly where stress concentrations occur under torsional and bending loads. A forged EN24 transmission shaft typically runs 40–60% longer between fatigue failures than an equivalent machined-from-bar shaft at the same hardness level. That is the engineering case for forging, and it is why automotive OEMs specify forged shafts for critical driveline components.
Input, output and countershaft forgings for manual gearboxes, transfer cases and industrial gearboxes. Forged from EN24 or SAE 4340 with gear seat diameters, spline sections and bearing journals machined to drawing. Heat treatment to 58–62 HRC on spline and gear seat areas via induction hardening, with core hardness 28–32 HRC maintained for toughness.
Solid and tubular drive shafts for passenger cars, commercial vehicles and off-highway equipment. Forged shaft stubs are electron-beam or friction welded to tube sections where required. Balancing, yoke machining and universal joint interface machining available to finished-part specification.
External and internal spline shafts in involute and straight-sided configurations. Splines cut by hobbing or broaching after rough turning, with profile ground to DIN 5480 or SAE J498 as specified. Spline root fillet radius, lead and profile tolerances are verified on CMM or dedicated spline gauging equipment.
Hollow forged shafts for weight reduction in motor and pump drives, wheel hub applications and electric vehicle motor shafts. Hollow bore is achieved by piercing in the forging process or by deep-hole gun drilling after forging, depending on bore diameter and depth. Material saving vs solid shaft: 20–35% depending on bore ratio.
Multi-diameter stepped shafts for pump, compressor and machine spindle applications. Forging near-net shape minimises machining stock on each diameter step, reducing turning time and material waste. Each diameter step, shoulder radius and overall length is verified against the customer drawing at first article.
Power take-off (PTO) shafts for tractors and agricultural machinery to ISO 500 and ASAE S205 standards. PTO stub shafts with 1-3/8″ 6-spline, 1-3/8″ 21-spline and 1-3/4″ 20-spline configurations. Also farmed equipment — rotavator shafts, pump drive shafts and combine harvester driveline components manufactured from EN8 and EN19.
The starting point for shafts in moderate-load applications — agricultural equipment, conveyor drives, pump shafts and general industrial duty. EN8 offers tensile strength 540–700 N/mm² in normalised condition, rising to 700–850 N/mm² after hardening and tempering. Good machinability and weldability. Cost-effective for high-volume production.
The standard choice for automotive transmission and heavy-duty industrial shafts requiring high core strength and surface hardness combination. EN24 achieves 850–1000 N/mm² tensile in Q&T condition, with excellent Charpy impact values down to −40°C. Used extensively in HGV gearboxes, earthmoving drivelines and marine shaft applications.
Chrome-moly alloy offering a good balance of strength (700–900 N/mm²), toughness and hardenability in sections up to 150 mm diameter. Frequently specified for medium-duty transmission shafts, machine tool spindles and pump shafts where EN8 is too soft but EN24 is over-specified. Lower cost than EN24 with comparable hardenability in smaller sections.
The international equivalent of EN19 and one of the most widely specified shaft materials globally. SAE 4140 in Q&T condition achieves 900–1100 N/mm² tensile strength with good fatigue performance. Our SAE 4140 shafts are supplied to chemical composition per ASTM A29 with hardness and mechanical properties certified per batch.
The heavy-duty shaft material for applications demanding the highest combination of strength, toughness and fatigue resistance — racing driveshafts, helicopter rotor shafts, heavy industrial gearbox input shafts. SAE 4340 can be heat treated to 1200–1400 N/mm² tensile with retained Charpy impact values of 30–50 J at −40°C. Section-sensitive: hardenability is excellent to 100 mm diameter.
Stainless steel shafts for food processing, marine and chemical pump applications where corrosion resistance is essential. 410 stainless (EN 1.4021) is heat treatable to 700–900 N/mm² and is the standard choice for pump shafts in clean fluids. 17-4PH stainless provides higher strength (≥1000 N/mm²) for demanding corrosion + load environments.
Billets are cut from inspected bar stock, heated to 1150–1250°C and forged in closed dies on our 400T–1600T presses. Near-net-shape forging leaves 3–6 mm stock on each surface — enough for the machining allowance without wasting material. Flash is trimmed and the forging is air-cooled or controlled-cooled depending on material and subsequent heat treatment route.
Rough forgings in EN24 and SAE 4140 are normalised at 870–900°C before rough turning to relieve forging stresses and achieve a uniform microstructure. Final Q&T — oil quench from 845°C, temper at 580–650°C — is performed after rough machining to achieve the specified hardness range. Journal surfaces are induction hardened to 58–62 HRC where specified for wear resistance.
Two-axis and multi-axis CNC lathes produce turned diameters, undercuts, chamfers and thread forms to drawing. Rough turning leaves 0.3–0.5 mm stock on journal diameters for subsequent grinding. Finish turning on non-ground surfaces achieves Ra 1.6 µm or better. CNC programs are stored and version-controlled for repeat orders.
Splines are cut by CNC gear hobbing after finish turning. Profile, lead and pitch errors are measured on our gear tester. For high-precision transmissions, splines are finish-ground after induction hardening to remove heat treatment distortion — critical for matching shaft spline to hub spline with the required tooth clearance.
Journal diameters for bearing seats, gear fits and seal running surfaces are cylindrical ground on CNC grinding machines to IT6 or IT7 tolerance as specified. Surface finish Ra 0.4–0.8 µm on bearing seats. Roundness, cylindricity and run-out are verified by CMM or precision V-block and indicator methods. Ground dimensions are recorded on the inspection report.
Shafts are 100% inspected for critical dimensions — journal diameters, overall length, spline profile, runout and visual surface condition. Hardness is re-verified after induction treatment. Components are individually tagged with part number, material grade and heat number, preserved with anti-rust oil and packed in foam-lined boxes or wooden crates for export.
Steel shafts are among the most mechanically demanding components in any machine — they transmit torque, support radial and axial loads, and must maintain dimensional integrity through millions of cycles without fatigue failure. The starting point for a reliable shaft is a quality forging: the closed-die forging process aligns grain flow along the axis and around stress-concentrating features like keyways, undercuts and shoulder radii. Shivam Forge has been producing forged steel shafts from its Rajkot facility for over 20 years, supplying transmission shafts, drive shafts, spline shafts, hollow shafts and PTO shafts to automotive, agricultural and industrial customers across India and 12+ export countries.
Material selection for shaft applications requires matching tensile strength, fatigue endurance limit, hardenability and toughness to the application duty cycle. EN8 is entirely adequate for agricultural conveyor shafts and low-speed pump drives. EN24 and SAE 4340 are the correct choices for HGV transmission shafts and heavy industrial gearbox input shafts where the combination of high surface hardness after induction treatment and tough core after Q&T is essential. SAE 4140 sits in the middle — widely available, well-characterised and the global standard for medium-duty shaft applications. Our team routinely advises customers on material selection when upgrading from a failed shaft or developing a new product.
The manufacturing process for a finished ground shaft at Shivam Forge runs through seven distinct stages: billet inspection and XRF verification, hot forging on closed dies, flash trimming, normalising, rough CNC turning, final heat treatment (Q&T or induction hardening as specified), finish CNC turning, spline cutting where required, and cylindrical grinding of bearing journals to IT6/IT7. Each stage has defined quality checkpoints with recorded data. The CMM report on a finished shaft typically covers 15–25 dimensional characteristics including journal diameters, runout, overall length, spline profile and thread pitch diameter.
Spline shaft production deserves particular attention because spline geometry is where many suppliers cut corners. Profile errors in hobbing, lead errors from gear hob deflection and distortion from heat treatment all contribute to spline fit problems in assembly. Our CNC hobbing machines are regularly re-calibrated and hob condition is verified before each production run. For automotive transmission splines, we perform induction hardening after hobbing and then finish-grind the spline profile — the only reliable method to hold DIN 5480 tolerance classes after surface hardening. This level of process discipline is what separates shafts that assemble correctly and run quietly from those that do not.
Export customers sourcing forged shafts from India find that Shivam Forge's combination of forging capability, in-house machining and documented quality system eliminates the coordination risk of using separate forging and machining sub-suppliers. Single-source supply from billet to finished ground shaft means one quality plan, one inspection report and one point of accountability. Contact our team at sales@shivamforge.com or +91 92657 72827 with your shaft drawing and annual volume requirement for a competitive quotation.
Our standard shaft materials are EN8 (080M40), EN24 (817M40), EN19 (709M40), SAE 4140 (42CrMo4) and SAE 4340. Stainless steel shafts in 410 and 17-4PH are produced for corrosion-sensitive applications. Material selection depends on required tensile strength, fatigue life, operating temperature and section size — our technical team can advise on the optimal grade for your application.
Cylindrical ground journals are routinely produced to IT6 and IT7 ISO tolerance classes. For a 50 mm bearing journal, IT6 corresponds to ±0.008 mm (fundamental deviation h6 gives 50h6 = 50−0.016 mm). Surface finish on ground journals is Ra 0.4–0.8 µm. Tighter tolerances to IT5 are achievable on specific features — contact us with your drawing for confirmation.
Yes. We produce involute and straight-sided spline shafts to DIN 5480, SAE J498 and ISO 4156 standards. Splines are hobbed and, where required after induction hardening, finish-ground to remove distortion. We supply spline shaft forgings and finished spline shafts to automotive gearbox and transfer case manufacturers in India and for export.
Yes. PTO stub shafts with 1-3/8″ 6-spline, 1-3/8″ 21-spline and 1-3/4″ 20-spline forms are a regular production item. We also manufacture rotavator shafts, pump drive shafts and other agricultural driveline components in EN8 and EN19. PTO shaft dimensions are produced to ISO 500 and ASAE S205 as specified.
Our standard production range covers shafts up to 500 kg forging weight. Shaft length depends on the press configuration and die size — typical range is 200 mm to 1,200 mm for closed-die forgings. Longer shafts in simpler cross-sections can be produced by open-die forging. Contact us with your shaft dimensions for a feasibility assessment.
Yes. Induction surface hardening of bearing journals, spline sections and gear seat surfaces to 58–62 HRC (or as specified) is performed in-house. Hardened depth is controlled by induction frequency and power — typically 1–4 mm effective case depth. Post-hardening tempering at 160–180°C reduces brittleness without significant hardness loss. Hardness is recorded on the inspection certificate.
Yes. Fully finished shafts — forged, heat treated, CNC turned, spline cut and journal ground — are supplied as standard finished components to customer drawings. This turnkey supply eliminates the need for customers to source separate forging and machining vendors and reduces total lead time. Drawing review and first-sample approval are included in new part development.
For new parts requiring tooling, first-sample lead time is 4–6 weeks from drawing approval to sample delivery. Repeat production orders on existing tooling are typically 3–4 weeks for rough forgings and 5–7 weeks for fully machined and ground shafts. Rush deliveries are accommodated where press capacity allows — discuss your schedule with our team at +91 92657 72827.
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.
