Automotive Bolts And Nuts Suppliers

Zhejiangxinye Automobile Technology Co., Ltd. has manufactured automotive fasteners and stamping parts at Jiaxing Port Area, Zhejiang since 1995, and our catalogue now runs beyond 500 product varieties. The range presented here as Automotive Bolts And Nuts Suppliers, Custom Car Screw Fasteners covers the joints that decide body stiffness, seat integrity, battery pack sealing and exhaust durability, produced in-house from raw material through cold heading, thread rolling, heat treatment, finishing and mechanical performance testing.

Where Our Fasteners Sit in the Vehicle

Our parts are specified by vehicle system rather than by catalogue page, because the working point — sheet thickness, mating material, access for the assembly tool, corrosion exposure and temperature — decides the geometry as much as the thread size does.

• Body-in-white and closures: spot weld T-nuts, cylindrical weld nuts, weld spacers and flange nuts that create a serviceable thread in thin-gauge panels.
• Seat systems: seat belt nuts, seat system nuts, adjustment shims, spacer nuts and adjuster parts for track and recliner assemblies.
• EV battery pack: sealed nuts that keep the enclosure thread tight against moisture and fluid ingress.
• Powertrain and exhaust: flange and hex nuts in temperature grades up to 650–700 °C for manifold and engine-periphery positions.
• Chassis and wheel end: wheel nuts, thick hex flange nuts and machined sleeves for suspension arm mounting.
• Interior: circlips, springs, knurled insert nuts and clamp components for trim retention.

Our Product Range

Five families cover the fastening and joining scope we produce, and each can be supplied to a documented standard or to your own drawing.

Strength, Tolerance and Thread Engineering

Class is a design decision, not a label. Our production history runs from class 5 and 8 fasteners to class 12 parts that carry higher axial loads in heavy-duty truck and high-performance engine positions, and class 13–14 ultra-high-strength nuts have completed pre-research for applications where conventional grades run out of margin.

• Tolerance control: thread and dimensional ranges are matched to the joint, with precision control from 0.06 mm to 0.30 mm depending on part size and function.
• MAT self-correcting thread: the first threads guide a slightly misaligned bolt back onto the correct path, which reduces cross-threading stalls on automated assembly lines.
• Flange and serration geometry: flange diameter, serration pattern and bearing face are set against the clamping surface to distribute load and resist loosening.
• Prevailing torque: nylon-insert lock nuts to GB/T 6182 and GB/T 6183 for joints that must stay put under vibration.

Coatings and Temperature Grades

Surface finishing runs on our own line, so corrosion class and heat resistance are selected at the specification stage rather than added afterwards.

Process Control and Acceptance

We operate to IATF 16949-2016, and process control starts before the first heading stroke: incoming steel is analysed, then traced through cold heading, tapping, thread rolling, heat treatment and finishing to finished-part mechanical performance testing.

Work instructions are written for the special and critical processes — heat treatment, thread formation, welding geometry on weld nuts and coating — and inspection is placed at each step rather than at the end of the line. Hardness testers sit with the heat-treat operation so grade and case condition are checked against the drawing continuously.

The acceptance scope we agree per part normally covers thread gauging and dimensional layout, hardness and mechanical performance, coating condition, weld or clinch features where applicable, and freedom from burrs on assembly faces.

Information We Use to Configure Your Solution

Packaging, Documentation and Supply Scope

Packaging is agreed per order so parts reach the line ready for feeding or kitting rather than being re-handled on arrival. Bulk cartons, bagged quantities, layer pads and label content are confirmed against your incoming-goods process, and mixed shipments of nuts, bolts, machined parts and stampings can be consolidated where a project calls for more than one family.

Alongside the parts, the documentation set is fixed during quotation: the controlling drawing or standard, material and strength grade, coating specification, and the inspection records your receiving inspection needs to release the lot. When a part is developed from a customer drawing rather than a published standard, the drawing revision governs the acceptance criteria for the life of the programme.

Frequently Asked Questions

What does Zhejiangxinye Automobile Technology manufacture?

We produce automotive fasteners and stamping parts: nuts, bolts and screws, CNC machined sleeves, pins and precision components, functional body, seat and battery hardware, and metal stampings. Production is completed in-house from raw material to finished goods across more than 500 product varieties.

Can you make a custom car screw fastener with no GB/T or DIN equivalent?

Yes. Our non-standard nuts and custom screw fasteners are built from the customer drawing. Send the drawing, thread specification, strength class, material, coating, mating part and annual volume and we configure the head form, thread, bearing face and finish around that working point.

Which strength classes and thread tolerances do you hold?

Production covers classes from 5 and 8 through class 12, with class 13–14 ultra-high-strength nuts developed for higher axial loads. Dimensional and thread tolerance ranges are controlled between 0.06 mm and 0.30 mm, selected according to part size and joint function.

How are fasteners specified for corrosive or high-temperature locations?

Trivalent zinc plating is rated at 480 h salt spray and Zn–Ni alloy plating at 480–720 h. For heat, we supply three temperature grades at 300 °C, 550 °C and 650–700 °C, which is how exhaust system and engine-periphery joints are matched to their service environment.

How does a project move from drawing to accepted delivery?

We review the drawing and working point, confirm material, class, coating and acceptance criteria, then run production under documented work instructions for the critical processes. Parts are inspected at each stage, from incoming steel analysis and hardness testing through finished-part mechanical performance checks, before the agreed packaging and documentation are released.

Do you supply mating parts as a set rather than single items?

Where a joint needs a matched pair, we engineer the bolt or screw against the nut, sleeve or stamped plate it seats in — flange geometry, thread fit, strength grade and coating are aligned so the assembly behaves as one system rather than as separately sourced hardware.