Weld Nuts Suppliers

Weld Nut Types and Where Each One Fits

A weld nut gives a panel a permanent threaded anchor where the sheet is too thin to tap and a loose nut cannot be reached from behind. Selection follows the welding method, the sheet thickness, gun access at the joint and the axial load the thread must carry.

Thread size, flange diameter and body height are confirmed against the panel drawing, and the projections are laid out for the electrode pattern of the weld gun used on the line.

Application Fit in Body, Seat, Chassis and Thermal Zones

Weld nuts are specified where the thread has to survive the life of the vehicle inside a seam that is closed after assembly. The families above map onto the main joint groups we supply.

• Body-in-white and closures: hinge, latch and bracket reinforcements in thin-gauge steel, where the nut carries the thread and the panel carries the load path.
• Seat structures: rail anchors, adjuster mounts and recliner attachments, coordinated with our seat system nuts and seat adjustment parts when the seat frame also uses non-welded fixings.
• Chassis, subframes and brackets: higher property classes for axial load, vibration and torque retention over the service life.
• Exhaust, EGR and engine periphery: 300 °C, 550 °C and 650–700 °C grades that hold preload under repeated thermal cycling.
• EV battery enclosures: our sealed nuts for EV battery pack applications cover joints where the welded seat must also restrict water ingress around the fastener.

Material, Property Class and Thread Configuration

Weldability governs the base material, while the thread and mechanical class are set by the clamp load the joint needs. Both sides are fixed before tooling is released.

• Base material: carbon steel is the standard choice for resistance welding to mild and high-strength steel sheet; other grades are reviewed against the panel they are welded to.
• Property class: capability spans Class 5/8 through Class 12, with Class 13–14 ultra-high-strength grades at pre-research stage for heavy-duty and high-performance applications.
• MAT self-correcting thread: the first threads guide a slightly misaligned bolt back into the thread path during automated assembly, reducing cross-threading stalls on the line.
• Tolerance: dimensions are held across a 0.06 mm to 0.30 mm control band according to the fit class on the drawing.
• Coating: trivalent zinc at 480 h salt spray and Zn–Ni alloy at 480–720 h, applied and checked on our own surface finishing line.
• Temperature grade: material and finish routes for 300 °C, 550 °C and 650–700 °C service in exhaust and engine-periphery locations.

Welding, Fixturing and Installation

A weld nut performs only as well as the welding window allows, so projection geometry is matched to the sheet rather than chosen from a table.

• Projection height is set so the sheet reaches fusion without burn-through across the specified thickness range.
• Flange diameter and body height are checked against gun shroud and electrode clearance at the joint before the drawing is frozen.
• The pilot or body diameter locates the nut in the panel hole, controlling position, runout and thread squareness.
• Seating face flatness and sheet angularity are held so clamp load is not lost to gap and torque readings stay consistent.
• Validation covers push-out force, torque-out, torque-tension behaviour and weld nugget cross-sections, sampled at an agreed frequency.

Quality Control and Acceptance

Our quality system is certified to IATF 16949-2016, with written work instructions for special and critical processes and inspection at every production step.

• Incoming raw material analysis covers chemistry and hardness before heading begins.
• Cold heading, tapping, thread rolling and heat treatment are each checked against the process instruction.
• Finished parts are tested for mechanical performance and hardness, with coating thickness and salt-spray verification on plated items.
• Dimensional inspection covers thread gauging, flange diameter, height, projection pitch, concentricity and runout to the drawing revision.
• Results are reviewed batch by batch before release, with records retained for traceability.

Customization, Tooling and Alternative Nut Types

Where the drawing departs from a catalogue shape, such as a wider flange, a longer body, a different projection layout, a fine thread or an alternative steel grade, we build the tooling around it. The Non-Standard Nuts range carries those welded variants alongside other made-to-print nuts from the same production system.

Where welding does not suit the panel, because the sheet is coated, thin or accessible from one side only, the Clinch Nuts range offers a press-embedded alternative. The wider Nuts range covers standard, self-locking, knurled, slotted and sliding types, all produced at our factory in Zhejiang.

Packaging, Documentation and Delivery Scope

• Inner packing protects plated surfaces and threads through container transport and manual or automated unpacking.
• Labels carry part number, drawing revision, batch, quantity and coating so receiving inspection can match the consignment to the order.
• The documentation package is agreed per order and can include material and mechanical test reports, dimensional records and the packing list.
• Carton format, quantity per box and pallet arrangement are fixed at order confirmation to suit the customer's receiving and line-feeding arrangements.

Information We Use to Configure Your Solution

A weld nut quotation is only as accurate as the joint description behind it. These are the inputs that change the tooling, the process route and the inspection plan.

Frequently Asked Questions

Which weld nut types does Xinye produce?

Spot weld T-nuts, zinc-plated round weld spacers, round weld spacers with internal thread and carbon steel cylindrical welding nuts, plus non-standard welded variants to customer drawing. Heading, tapping, heat treatment, thread rolling and surface finishing are all carried out in-house.

Which property classes and coatings are available?

Our capability spans Class 5/8 through Class 12, with Class 13–14 ultra-high-strength grades in pre-research. Trivalent zinc is rated at 480 h salt spray and Zn–Ni alloy at 480–720 h; temperature grades of 300 °C, 550 °C and 650–700 °C cover exhaust and engine-periphery joints.

Can weld nuts be produced to our drawing instead of a standard shape?

Yes. Flange diameter, body height, projection layout, thread, material and coating are taken from the drawing, and tooling is built to that configuration before samples are submitted for evaluation on your fixture.

How is weld nut quality verified before shipment?

Under our IATF 16949-2016 system, raw material chemistry and hardness are checked on arrival, each forming and heat-treatment step is inspected against its work instruction, and finished parts are tested for mechanical performance, hardness, coating and dimensions against the drawing revision.

What information do you need to quote a weld nut?

A drawing or sample, panel material and thickness, required property class, coating and corrosion target, service temperature, weld method and gun access, annual volume, packaging and the inspection documents you expect with each batch. With these we return a configuration, tooling scope and quotation.

When is a weld nut the better choice over a clinch nut?

A weld nut suits weldable steel sheet with gun access at the joint and a thread that must sit inside a closed section. A clinch nut is the practical route where welding is not permitted, the panel is coated, or the press line can embed the fixing during forming.