Tie Rod Forging — Inner & Outer Ends, Drag Links & Steering Rod Assemblies
Shivam Forge manufactures hot-forged tie rod ends, centre rods and drag links for passenger cars, LCVs, buses, tractors and heavy trucks from our Shapar, Rajkot factory. Tie rod forgings are produced in EN8/C45, EN19T (42CrMo4) and EN24T (SAE 4340) to customer drawings, with CNC-machined ball seat pockets, threaded shanks to M12–M30 metric, and optional zinc plating (8 µm + yellow chromate). 100% magnetic particle testing is standard — these are safety-critical steering linkage components.
A tie rod end failure is a steering failure. Unlike many automotive components where degradation is gradual, a cracked or worn tie rod end can result in complete loss of directional control. This safety criticality places tie rod forgings in the highest documentation tier: 100% magnetic particle test, PPAP Level 3 with 30-piece dimensional inspection, and Cpk ≥1.33 on ball seat pocket diameter and thread pitch diameter. Shivam Forge has supplied tie rod forgings to India's automotive supply chain for over two decades. We understand what OEM quality assurance teams look for — and our process delivers it consistently. Call +91-9265772827 to discuss your tie rod forging programme.
Inner tie rod (rack end) and outer tie rod end forgings for passenger cars and SUVs in EN19T (42CrMo4). The ball socket housing geometry — taper bore, seal groove, dust cap retention feature — is forged near-net with 3 mm machining stock. Ball seat is finish-machined and thread is cut to M14–M20 as per OEM specification. Used in rack-and-pinion and recirculating ball steering systems.
Tie rod end forgings for light commercial vehicles (Tata Ace, Mahindra Supro) and mini trucks in EN8/C45 for economy applications and EN19T for higher-duty requirements. LCV tie rods typically use M16–M22 thread shanks with ball seat taper to DIN or OEM specification. We supply both rough tie rod forgings and machined-finished components.
Bus drag link forgings are considerably heavier than passenger car equivalents — ball housing diameters of 40–60 mm with M24–M30 threaded shanks are common. We forge drag link bodies and steering rod ends for bus and coach applications in EN19T and EN24T, with 100% MPT and dimensional inspection on all safety-critical features.
Agricultural tractor tie rods operate in mud, dust and high-cyclic shock loading environments. We forge tractor tie rod bodies and end forgings in EN8 and EN19T to tractor OEM drawings, with aggressive taper shank designs and large ball housing sections that accommodate articulated steering loads on heavy tractors above 50 HP.
Three-wheeler (auto-rickshaw) front axle tie rod forgings are smaller but safety-critical components requiring tight dimensional control. Ball socket housing, thread shank and locking flat features are forged and machined to three-wheeler OEM drawings for Bajaj, Piaggio and TVS applications. Production volumes are typically high, benefiting from efficient multi-impression tooling.
Heavy truck and trailer drag links work under combined axial and bending loads at high cyclic frequency. We forge heavy truck drag link bodies and clevis ends in EN24T (SAE 4340) with Q&T heat treatment to 28–35 HRC. Thread shanks at M27–M36 are machined to OEM or DIN standard. Ball joints are typically sourced separately and assembled into the machined socket.
Material grade is selected based on application load rating, vehicle GVW and OEM specification. EN8/C45 for trailer and economy applications. EN19T (42CrMo4) for standard automotive and tractor use. EN24T (4340) for heavy vehicle and high-tensile requirements. Mill certificates with full chemical analysis are retained by heat number and referenced to every batch inspection certificate.
Tie rod end blanks are produced by closed-die hot forging at 1,100–1,250°C on our 150T to 500T hammer presses. Multi-impression dies establish the ball housing geometry, shank section and thread blank diameter in sequence. Flash is trimmed in a separate trimming press. Forged surface finish at 125–250 Ra is adequate for machining allowance without additional scale removal.
EN8 and C45 tie rod forgings are normalised at 860–880°C after forging to relieve forging stresses and refine grain structure, achieving 160–220 BHN. EN19T and EN24T forgings are quenched and tempered to the drawing-specified hardness range — typically 255–310 BHN (28–34 HRC) for standard automotive duty. Hardness is verified on every batch using portable Brinell tester and certificate.
Machined tie rod ends are produced on CNC turning centres. Ball seat pockets are bored to H7 tolerance for consistent ball joint fit. Thread ends are single-point turned and threaded to M12–M30 metric per drawing — thread class 6H or 6g as specified. Shank OD and overall length are finish-machined with ±0.05 mm tolerance. Thread gauge verification is 100% on safety-critical parts.
Every tie rod end forging undergoes magnetic particle testing (MPT) to detect surface and near-surface cracks before dispatch. Testing uses wet fluorescent MT under UV (black light) per ASTM E709 standard. Acceptance criteria are zero linear indications on the ball housing and thread shank. Test results are recorded per batch with inspector signature and retained for 10 years.
For new automotive tie rod forging programmes, we prepare PPAP Level 3 documentation: Part Submission Warrant, 30-piece dimensional inspection on CMM covering all OEM drawing characteristics, material test report linked to mill heat cert, PFMEA, control plan, MSA results for ball socket bore gauge and thread gauges, and initial sample inspection report. First-article approval is confirmed before production release.
EN8 (080M40) and C45 (080M46) are the economy grades for tie rod applications with lower load ratings — light trailers, economy passenger cars and low-power tractors. Normalised to 160–220 BHN. Tensile strength 570–700 MPa. These grades provide adequate fatigue life at minimum material cost for less demanding duty cycles. Mill cert to BS EN 10083 or IS 1570 included.
EN19T (42CrMo4 / 708M40, ASTM 4140) is the most widely specified grade for passenger car and LCV tie rod ends. Q&T to 850–1000 MPa UTS (255–310 BHN). The chromium and molybdenum additions give excellent fatigue resistance under the combined axial and lateral loads of rack-and-pinion steering. Certified to BS EN 10083-3 with 3.1 inspection certificate.
EN24T (817M40 / SAE 4340 / 1.6582 36CrNiMo4) for bus drag links, heavy truck tie rod ends and off-highway steering components. Q&T to 1000–1100 MPa UTS (302–363 BHN). The nickel-chromium-molybdenum composition delivers high toughness at elevated strength, essential for heavy vehicle duty with large shock loads. Charpy impact testing at -20°C available for cold-climate export specifications.
40Cr (GB 3077 grade) is the Chinese national standard equivalent to approximately 42CrMo without the molybdenum addition. Required for Chinese-brand vehicle aftermarket and export tie rod programmes where the original equipment specification was Chinese. We can procure 40Cr billet with Chinese GB cert or certify equivalent performance against customer's specification.
Standard metric threads M12 through M30 in pitch options per ISO 261 are machined and verified with calibrated thread ring and plug gauges (6H/6g class). Right-hand and left-hand threads (for adjustable tie rod assemblies) are produced to drawing. UNF threads for export applications and JIS threads for Japanese OEM-origin programmes are also available on request.
Standard corrosion protection for automotive tie rod ends is zinc electroplating at 8 µm minimum, followed by yellow trivalent chromate passivation per ISO 4520. Salt spray resistance exceeds 200 hours to red rust per ISO 9227. Alternative finishes — black zinc-nickel (12 µm), zinc-iron (15 µm), or dacromet — are available through our plating subcontractor for specific OEM surface treatment specifications.
Tie rod ends are among the few automotive components where a single-piece failure results in immediate, uncontrolled vehicle behaviour. The inner tie rod transmits the steering rack's lateral force to the outer tie rod end; the outer end converts that force into the wheel steering angle at the knuckle. A fractured tie rod end at highway speed means the wheel goes straight while the rest of the vehicle may not. This is why tie rod forgings — unlike bracket forgings, flange forgings or most structural components — carry mandatory 100% magnetic particle testing as a shipment release condition. Shivam Forge treats tie rod forgings as safety-critical by default, not only when the customer specifies it.
The forging process is the only viable manufacturing route for tie rod ends. Casting produces dendrite solidification structures with unpredictable crack initiation sites — unacceptable for a component under alternating bending and axial loads. Machining from bar stock wastes material and severs the longitudinal grain flow that forging establishes parallel to the primary load direction. A properly forged tie rod end has continuous grain flow from the ball housing through the shank and into the thread section, orienting the material's highest fatigue resistance where the highest cyclic stress concentrations occur at the housing-to-shank fillet radius.
Grade selection for tie rod ends follows vehicle load ratings. EN8 and C45 (normalised, 160–220 BHN) are adequate for light trailer tie rods and economy passenger car applications where loads are modest and replacement cycles are short. EN19T (42CrMo4, Q&T to 255–310 BHN) is the standard grade for passenger cars, LCVs and tractors — the chromium-molybdenum alloy delivers fatigue resistance that outlasts the vehicle's design life under normal operating conditions. EN24T (SAE 4340, Q&T to 302–363 BHN) is specified for bus drag links and heavy truck steering rods where axle loads above 8 tonnes impose large cyclic forces on steering linkage components. Our technical team confirms the grade for any new programme before tooling investment is committed.
Thread machining is the precision-critical operation in tie rod end production. The thread pitch diameter on M16–M24 shanks must land within ±0.05 mm of nominal for correct clamp load in the steering arm mounting. Ball seat pockets are bored to H7 tolerance for consistent ball joint pre-load and articulation torque. Thread gauges — ring gauges (6g external) and plug gauges (6H internal) — are calibrated quarterly and used on 100% of production for automotive tie rod ends. First articles are measured on CMM with full dimensional reports against drawing tolerances submitted as part of PPAP Level 3 documentation.
The surface treatment most specified for automotive tie rod ends is zinc electroplating at 8 µm minimum followed by trivalent chromate passivation, providing over 200 hours salt spray resistance to first red rust per ISO 9227. We supply plated components through our certified plating subcontractor and include surface treatment in the quotation as a line item. Zinc-nickel and dacromet alternatives are available for applications requiring longer corrosion protection or compatibility with specific assembly lubricants. To discuss a tie rod forging programme — passenger car, LCV, tractor or heavy truck — call +91-9265772827 or email sales@shivamforge.com with your drawing.
Yes. We manufacture hot-forged tie rod ends, drag links, centre rod bodies and steering rod forgings from our Shapar, Rajkot factory. Applications include passenger cars, LCVs, buses, tractors and heavy trucks. Both rough forgings and finish-machined tie rod ends with threaded shanks and ball socket pockets are supplied. Call +91-9265772827 or email sales@shivamforge.com with your drawing.
The inner tie rod end (rack end) connects the steering rack to the outer tie rod; it typically has a larger ball joint designed to articulate in multiple directions as the steering rack moves. The outer tie rod end connects to the steering knuckle; it carries the steering arm loads directly and is the more heavily loaded of the two. Both are safety-critical forgings requiring 100% MPT. We forge both types, with ball socket housing geometry and thread shank dimensions to OEM drawings.
Material selection depends on vehicle type and GVW. EN8 or C45 for economy and trailer applications. EN19T (42CrMo4) for standard passenger cars, LCVs and tractors — the most commonly specified grade for automotive tie rods. EN24T (SAE 4340) for buses, heavy trucks and off-highway applications where higher tensile strength and toughness are required. Our technical team reviews the application before confirming grade.
Yes. Tie rods are safety-critical steering components — a missed crack that leads to in-service fracture creates an immediate accident risk. We apply 100% magnetic particle testing on every tie rod forging before dispatch using wet fluorescent MT under ASTM E709. Zero linear indications are accepted. Test records are maintained for 10 years and referenced to the part batch inspection certificate.
Inspection on tie rod end forgings includes: 100% magnetic particle test (wet fluorescent, ASTM E709); 100% thread gauge verification (ring and plug gauges, class 6H/6g); dimensional sampling inspection covering ball socket bore diameter, shank OD, thread pitch diameter and overall length; hardness testing on every heat treatment batch; and visual inspection for forging defects (folds, laps, cracks, underfill). CMM inspection on first articles covers all drawing dimensions.
Yes. We machine threads to customer-specified pitches and profiles. Standard metric (ISO 261) M12–M30 in coarse and fine pitch are routine. Left-hand threads for adjustable assemblies, UNF threads for export programmes and JIS threads for Japanese OEM-origin designs are available. Customer-supplied thread ring and plug gauges can be used for inspection if tighter tolerance than our standard gauges provides.
For passenger car tie rod ends (small components under 0.8 kg): MOQ is 200–500 pieces. For LCV and tractor tie rod ends (1–3 kg): MOQ is 100–200 pieces. For heavy truck drag link forgings (above 5 kg): MOQ is 25–50 pieces. PPAP programmes are initiated on first-article quantities of 30–50 pieces for qualification, followed by production MOQ on approval.
Email your part drawing (PDF, DXF or STEP) with material grade, heat treatment specification, thread form, surface treatment requirement and annual volume to sales@shivamforge.com. We assess forgeability, confirm the machining operations required, and return a detailed quotation covering forging, heat treatment, machining and surface treatment within 48–72 working hours. Call +91-9265772827 for urgent enquiries.
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.
