Self-Locking Nuts Suppliers

Zhejiangxinye Automobile Technology Co., Ltd. manufactures self-locking nuts for automotive and industrial threaded joints at our plant on Jingyi Road, Jiaxing Port Area, Zhejiang, China. Since 1995 we have produced fasteners for vehicle build, and the locking-element nuts in this range come off the same cold heading, tapping, heat treatment and finishing lines as the rest of our nut program. Our quality system is certified to IATF 16949-2016.

Our role as Custom Self-Locking Nuts Suppliers, Exporter means the insert, nut body, thread and coating are all controlled on one site. Strength class, thread tolerance, prevailing-torque behaviour and packaging are set from your drawing, the mating bolt and the torque strategy used at assembly, not from a fixed catalogue page.

Our Self-Locking Nut Range

The series below is what we quote most often for chassis, powertrain, seat structure, exhaust, battery-pack and general equipment joints. Standard hexagon insert nuts form the base; the same tooling platform supports flanged, closed-end, welded and knurled variants where the joint demands them.

The wider nut program includes standard, weld, knurled, slotted, clinch and sliding families, plus CNC machined parts and stampings, so a joint group can be supplied as one coordinated package. Current Nuts availability follows the same in-house route from raw material to finished part.

Where Insert-Type Lock Nuts Fit

Non-metallic insert nuts are chosen where a joint must resist loosening under vibration without relying on a separate washer or thread-locking fluid. The nylon collar develops prevailing torque on the bolt thread and keeps it after repeated removal cycles.

• Chassis, suspension and steering joints where re-use during service is expected.
• Seat frames, seat tracks and interior structure with mixed bolt classes.
• Exhaust and engine-periphery positions where a defined temperature grade is needed.
• EV battery-pack and enclosure fastening where a closed-end or flanged body is specified.
• General industrial equipment assemblies using standard metric coarse or fine threads.

Materials, Strength Classes and Thread Control

Nut bodies are formed from carbon and alloy steel selected against the required property class, with heat treatment applied where the class demands it. Our class development runs from the early 5 and 8 grades through Class 12, with Class 13–14 ultra-high-strength nuts in pre-research for heavy-duty and high-output engine applications.

• Property classes quoted against the bolt class and the clamp load the joint carries.
• Tolerance bands combined from 0.06 mm to 0.30 mm depending on fit and assembly method.
• MAT self-correcting thread technology on the first threads, which guides a slightly misaligned bolt into the thread path during automated assembly.
• Hardness and mechanical performance verified on finished parts, not only on the wire lot.

Coatings and Temperature Service

Surface finishing is run in-house, which keeps corrosion performance and appearance consistent across a production lot. Coating selection follows the vehicle zone, the mating bolt coating and the salt-spray target written into the drawing.

• Trivalent zinc plating with salt-spray performance up to 480 hours.
• Zinc-nickel alloy plating for 480 to 720 hours, used in underbody and wheel-adjacent positions.
• Temperature grades at 300°C, 550°C and 650–700°C for exhaust and engine-periphery locations.
• Insert grade matched to the sustained joint temperature so the locking torque remains within range.

Non-Standard and Drawing-Based Configurations

Where a catalogue nut does not fit the envelope, we build the part from the drawing: body height, flange profile, knurl pattern, tab position, dome depth and insert depth can all be adjusted. Our Non-Standard Nuts route covers these changes through cold heading tooling and secondary machining, with samples agreed before series production.

Typical custom changes include reduced hex across flats for socket access, added flange diameter for thin-gauge panels, closed-end geometry for exposed threads, and coating changes for a specific corrosion cycle. Each change is confirmed against the mating bolt and the assembly tooling before release.

Quality Control and Acceptance

Our IATF 16949-2016 system runs from raw material analysis to finished-part testing, with written work instructions for special and critical processes. Inspection points are placed at incoming wire, heading, tapping, heat treatment, plating and final packing.

• Chemical composition and material traceability on incoming steel.
• Thread gauging, dimensional checks and insert retention during production.
• Hardness testing and mechanical performance testing on finished nuts.
• Coating thickness and salt-spray verification for plated lots.
• Assembly trial fitting on request to confirm prevailing torque and re-use behaviour.

For programme parts, we agree the inspection plan and acceptance criteria with your quality team before the first production run, including the sample submission format your release process requires.

Information We Use to Configure Your Solution

Our proposal is built from the working point of the joint and the production route it feeds. The following inputs let us fix the design, class, coating and inspection scope without assumptions.

• Drawing or standard reference, including the base style (GB/T 6182, GB/T 6183, or another equivalent) and any deviation.
• Thread size and pitch, tolerance band, and the mating bolt class and coating.
• Required property class, prevailing torque range and re-use cycles expected in service.
• Operating temperature, corrosion target and the vehicle or equipment zone.
• Assembly method — manual, pneumatic or automated nut runner — and the torque strategy.
• Annual and batch quantities, packaging format and the labelling your line reads.
• Inspection documents, sample submission requirements and any traceability rules.

Packaging, Documentation and Delivery Scope

Self-locking nuts are packed to protect the insert and the coating in transit, with bulk cartons, small-unit boxes and labelled containers available to match your receiving process. We confirm the packing format, quantity per container and marking at quotation stage so goods arrive ready for line-side use.

Shipments are accompanied by the inspection records agreed for the part, together with material and lot traceability data. Where a joint needs a companion part — a welded nut, a knurled insert or a machined sleeve — the same documentation set covers the full delivery.

Frequently Asked Questions

Which self-locking nut styles do you manufacture?

We produce hexagon nuts with non-metallic insert in GB/T 6182 (Type 2) and GB/T 6183 (Type 1) styles, together with flanged, closed-end, welded and knurled variations. The GB/T 6182 hexagon nuts with non-metallic insert (Type 2) is our most frequently specified locking style for higher-class structural joints.

Can you produce parts to our own drawing instead of a standard?

Yes. Body height, flange profile, knurl, tabs, dome depth and insert depth are all adjustable, and we quote from the drawing with samples agreed before series production. Custom parts follow the same heading, tapping, heat treatment and plating route as our standard nuts.

What strength classes and thread tolerances can you hold?

Our current programme covers Classes 5 to 12, with Class 13–14 ultra-high-strength development in pre-research, and tolerance bands combined between 0.06 mm and 0.30 mm according to the fit required. The class is always fixed against the mating bolt and the clamp load the joint carries.

Which coatings are available for corrosion resistance?

Trivalent zinc plating reaching up to 480 hours of salt spray, and zinc-nickel alloy plating for 480 to 720 hours. For hot positions we supply temperature grades at 300°C, 550°C and 650–700°C, with the insert grade selected to match.

How is quality controlled through production?

Under our IATF 16949-2016 system, inspection runs from incoming steel analysis through heading, tapping, heat treatment and plating to final mechanical and hardness testing. Written work instructions govern special and critical processes, and the inspection plan for a programme part is agreed with your quality team in advance.

What do you need to prepare a quotation?

Send the drawing or standard reference, thread size, property class, coating, operating temperature, assembly method, quantities and the documentation you require. With those inputs we confirm the design, inspection scope and packing format in the quotation.