Buyers of high-tensile fasteners ask for proof of strength class, coating and tightening behaviour on every lot. Our fasteners testing instruments manufacturers in India team builds machines to examine these properties, and our suppliers in India network delivers them to fastener plants, heat treatment shops and third-party labs.
Fastener testing divides into mechanical strength, tightening behaviour, geometry and surface protection. Strength is covered by the bolt and stud proof load tensile machine, the wedge tensile tester with angled wedge set, the nut proof load fixture and the Rockwell hardness tester with fastener anvils.
Tightening behaviour is checked on the torque-tension machine and the prevailing torque tester for lock nuts. The thread pitch and profile projector handles geometry. Surface protection and delayed fracture are examined with the coating thickness and adhesion set, the salt spray and cyclic corrosion chamber and the hydrogen embrittlement sustained load frame, which matters for electroplated high-strength bolts.
Last updated: November 2026
Hydraulic tensile machine with threaded and wedge grips for proof load, yield and ultimate tensile tests on full-size bolts and studs. Used by fastener makers and structural bolt QC laboratories.
Torque-tension bench that tightens a bolt while measuring torque and clamp force simultaneously to find the nut factor. Used by fastener coaters, automotive assemblers and joint design engineers.
Combined magnetic and eddy current coating thickness gauge with a cross-cut adhesion kit for zinc, phosphate and geomet coated fasteners. Used in plating shops and fastener QC.
Servo torque bench that turns lock nuts and self-locking screws on and off a test bolt and records prevailing torque in each cycle. Used by automotive fastener makers and assembly plants for locking performance checks.
Optical profile projector with a screen reticle and rotating stage for measuring thread pitch, flank angle and major diameter of screws and bolts. Used by thread rolling shops and gauge rooms.
Sustained load rig that holds fasteners at a set percentage of tensile strength for 200 hours to check for delayed fracture after plating. Used by plating houses and high-strength bolt suppliers.
Compression and tension fixture with hardened mandrels that loads nuts to proof load and checks thread stripping, with a digital load cell. Used by nut manufacturers and fastener test laboratories.
Rockwell hardness tester with fastener holding anvils for testing bolts, nuts, screws and washers in surface and core zones. Used by heat-treated fastener makers to confirm property class.
Programmable chamber that runs salt fog, dry and humid cycles on plated fasteners. Used by coating applicators and automotive fastener suppliers for corrosion life comparison.
Wedge tensile fixture that pulls bolts through hardened angled wedges to test head-to-shank integrity under eccentric load. Used by cold forging plants and automotive bolt suppliers on a standard universal testing machine.
| Function | Products | What to confirm |
|---|---|---|
| Tensile and proof load | Bolt and Stud Proof Load Tensile Testing Machine, Wedge Tensile Tester for Fasteners with Angled Wedge Set, Nut Proof Load Testing Fixture with Digital Load Cell | Machine capacity against your largest bolt size and grade, thread diameters covered by the grips, wedge angles supplied and load cell accuracy class. |
| Tightening behaviour | Digital Torque Tension Test Machine for Fasteners, Fastener Locking Torque Prevailing Torque Tester | Torque and clamp load range, rotational speed, nut and bolt size range, and whether the data output gives torque, tension and friction factor. |
| Hardness and geometry | Rockwell Hardness Tester for Fastener Cross Sections, Fastener Thread Pitch and Profile Measuring Projector | Rockwell scales fitted, anvil shapes for round sections, projector magnification, screen size and the thread forms you must verify. |
| Coating, corrosion and embrittlement | Fastener Coating Thickness and Adhesion Test Set, Washer and Fastener Salt Spray with Cyclic Corrosion Chamber, Hydrogen Embrittlement Sustained Load Test Frame for Fasteners | Thickness probe range, chamber volume and cycle programming, number of frame stations, sustained load capacity and hold time required. |
Fastener instruments are specific to bolts, nuts, studs and washers, and test properties such as strength class, torque-tension and thread geometry that apply across any industry. The automotive range tests finished vehicle parts such as wheels, hoses and trim against OEM durability procedures. A supplier of automotive fasteners may need both, but a fastener plant mainly needs the proof load, wedge and torque machines described here.
See also: Automotive Material and Parts Testing Instruments
The complete Fasteners Testing Instruments range (10 products), in alphabetical order:
Calculate the highest proof or breaking load for the largest bolt and grade you produce, and choose a machine with at least 20 to 25 percent reserve. Check the grip set for your thread sizes, load cell accuracy, platen alignment, speed control and the software or display that records proof load and ultimate tensile strength for each lot.
Wedge tensile testing shows whether the head to shank junction survives under angled loading and reveals the true ultimate strength. Torque-tension testing shows how a fastener behaves when tightened, giving the relation between applied torque and clamp force. Customers in structural and automotive supply often require both reports.
Work out the fastener sizes, the percentage of specified tensile load to be held and the hold duration, which is often 200 hours or more. Check station count, load maintaining mechanism, alignment and the arrangement for stopping a station when a specimen fractures. Plated fasteners above a certain hardness are the main reason to buy it.
Bolt, nut and stud manufacturers, forging and cold heading plants, heat treatment and electroplating shops, fastener distributors that sell certified stock, construction and railway contractors that inspect incoming fasteners, and NABL-style test labs are the usual buyers. A plant normally buys the proof load machine and hardness tester first, then adds torque-tension, thread projector and coating checks as customer audits get stricter.
Yes, we export these machines. Send the fastener grades and size range you test, the standards you work to and your supply voltage, and we will prepare a quotation covering packing for the destination.
Proof load testing applies a specified tensile load to a bolt or nut and holds it for a short time. The fastener must show no permanent elongation or damage beyond a set limit. It confirms that the strength class claimed on the product is actually met.
A tensile machine can test both when the correct fixtures are used. Bolts are held in threaded grips, while nuts are tested on a hardened mandrel in a fixture. Stating the sizes you need helps us provide the right grips and mandrels.
Load measurement accuracy depends on the cell class, and most plants work to better than 1 percent of reading in the usable range. Please tell us whether your customers require a calibration certificate, and we will quote the machine with this requirement.
Tensile frames and torque benches need a firm, level base and a suitable power supply. We guide you on foundation and utilities, and can arrange commissioning and operator briefing for your inspection team when requested at the time of order.
As established manufacturers and suppliers for tender requirements from India, we undertake civil laboratory and industrial testing tenders as well as bulk and OEM supply of mechanical engineering and testing laboratory equipment. Please forward your tender specifications and our team will prepare a detailed quotation for Fasteners Testing Instruments.
Send us your equipment list or tender specification. We quote against IS, BS, EN, ASTM and AASHTO standards and ship to 90+ countries.
