Prevailing Torque Lock Nuts

Handan Hengmai Fasteners Manufacturing Co., Ltd. is one of the most reliable manufacturers and suppliers of prevailing torque lock nuts in China. As we have world-leading production equipment and strong manufacturing capabilities, we warmly welcome you to buy bulk high quality prevailing torque lock nuts for sale here from our factory. Customized orders are welcome.

Prevailing torque lock nuts are professional anti‑loosening fasteners produced in compliance with ISO 2320, DIN 6927 and GB/T 3098.10 standards. Different from ordinary nylon insert lock nuts relying on polymer clamping, the all‑metal version forms stable rotational resistance through controlled thread deformation. Locking torque takes effect even before full preload is established, resisting automatic loosening caused by transverse vibration, thermal expansion and cold contraction, or joint relaxation. It can work continuously under temperatures above 120 ℃ where nylon locking parts soften and fail, making it the preferred fastening solution for high‑temperature mechanical equipment. Our factory implements ISO9001 full‑process quality control, stocks metric coarse/fine‑thread specifications and provides customized strength grades and surface treatments for energy, automotive and metallurgical projects along Belt‑and‑Road markets.

1. Metallic interference locking structure avoids high‑temperature aging failure of nylon rings, suitable for engine exhaust, furnace equipment and thermal cycling scenarios;

2. Stable prevailing torque remains effective even when axial preload decreases slightly under long‑time vibration; no thread locker glue or auxiliary washers are required;

3. Moderate reusability: 5–10 times of disassembly and assembly with little attenuation of anti‑loosening performance under standard operating conditions;

4. Multiple anti‑corrosion coating options adapt to outdoor open‑air equipment and corrosive industrial workshops.

Mainly applied in high‑temperature and strong‑vibration scenarios: automobile exhaust systems, engine peripheral fastening, metallurgical furnace auxiliary machinery, oil‑gas pump units, wind‑power transmission assemblies and industrial gearbox connection. It is widely chosen by engineering buyers for key dynamic joints where polymer‑based lock nuts cannot run reliably for a long time.

Every batch undergoes prevailing torque detection, thread go/no‑go gauge inspection, hardness sampling and salt‑spray anti‑corrosion testing before shipment. Torque‑clamp force tests are carried out referring to ISO 16047 standards; mill test certificates and SGS third‑party inspection reports can be issued for bulk orders. Raw material traceability files are archived permanently.

Standard packing: inner moisture‑proof PE bags + outer woven bags with pallet stacking for sea freight; carton packing and custom shipping marks are acceptable for small urgent orders. Store in dry ventilated warehouses away from corrosive vapors; avoid heavy extrusion to prevent thread deformation. We cooperate with stable logistics providers to supply FOB/CIF/DDP multi‑mode delivery plans with controllable transit periods.

Pre‑sales technicians recommend matched grades and surface treatments according to your equipment operating temperature and vibration intensity. If factory‑caused defective products appear after arrival, we arrange free re‑delivery and bear relevant logistics costs. Technical guidance for torque control during installation is provided online.

Hot Tags: prevailing torque lock nuts, China prevailing torque lock nuts manufacturers, suppliers, factory, Din934 Hex Nut, High Strength Heavy Hex Nut, Metric Nylon Insert Lock Nuts, Prevailing Torque Lock Nuts, Stainless Steel Hex Nuts, Zinc Plated Hex Nuts