Manufacturing capability

Built around bushings, pins and drawing-to-order parts

From CNC turning and grinding to heat treatment, thread rolling and surface finishing, most operations run under one roof in Yuhuan, Zhejiang — which is why we can hold tolerance and lead time on both series parts and one-off custom work.

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4,000 m²Plant area

50Staff · 10 R&D · 5 QC

8M pcs2024 output

IATF 16949Quality system

Flagship product line

Wheel nuts for commercial vehicle aluminum wheels

Steel wheel nuts for aluminium wheels — not nuts made of aluminium. The distinction matters: the nut has an unforgiving job, holding a truck wheel under torque and vibration for years without corroding against the aluminium hub. This is the line we build most seriously — what we believe is the best commercial-vehicle wheel nut quality produced in China.

Purpose-built for aluminium hubsSeat radius, thread and coating are matched to aluminium wheels — Dacromet or zinc-nickel finish to keep galvanic corrosion away from the hub face.
Automated production lineMachining, assembly and packing are linked on one line, so torque and coating thickness stay consistent from the first nut to the last.
In-line infrared inspectionEvery nut passes an infrared inspection station on the line. Out-of-spec parts are rejected automatically instead of being found later by hand sorting.

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01 — Core processes

Machining capability in-house

Turning, milling, grinding, thread rolling and tapping are all done in our own workshop, together with heat treatment and surface finishing. Keeping these steps inside means we control the interface between roughing and finishing — the part that usually decides whether a fit holds.

We run both job-shop style work (small batches, frequent changeover) and series production, including an automated line for wheel nuts used on aluminium wheels, with robotic handling.

CNC turning CNC milling Grinding Thread rolling Tapping Heat treatment Dacromet

Material	45# / 40Cr / 20CrMnTi / GCr15 / 6061 / 7075
Tolerance	±0.01 mm (ground)
Surface finish	Dacromet / zinc-nickel / black oxide / plating
Standard	DIN 74361-3 / ISO 898-1 / custom drawing
MOQ	100 pcs (trial) / series by agreement
Lead time	7–15 days sample / 25–30 days series

Hydraulic fixtures and tooling, made in-house

02 — Bushings & pins

Shaft sleeves and pins, our core line

Bushings and pins are the parts we have made the longest. They are wear parts: the failure mode is almost never "it broke", it is clearance opening up, a press fit loosening, or a pin seizing. So the work is really about fit, hardness and surface finish — not about hitting a nominal dimension.

Fits that survive assembly. Bores and shafts ground after heat treatment, so distortion does not eat the tolerance.
Wear resistance. Case hardness selected per application — soft enough to seat, hard enough to last.
Batch consistency. Same tooling, same process parameters, batch-traceable material.

Bushings, pins and spacers — machined, ground and ready to fit

Products	Shaft sleeves, bushings, spacers, pins, king pins, steel-plate pins
Material	45# / 40Cr / 20CrMnTi / GCr15 / 6061 / 7075
Outer diameter	Ø10 – 150 mm
Inner diameter	Ø5 – 120 mm
Length	10 – 300 mm
Tolerance	IT7 on ground fits
Surface finish	Ra 0.8 on ground faces
Hardness	HRC 28 – 58
Concentricity	≤ 0.02 mm

03 — Custom & OEM

Non-standard parts, taken on properly

We accept work from a drawing or from a sample. Small trial batches are welcome — most of our long-term OEM customers started with a few hundred pieces and a problem part somebody else would not quote.

Drawing-to-order. 2D (DWG / PDF) and 3D (STEP / IGES).
Sample-to-order. Reverse-engineered from your existing part, with material and hardness verified.
Small batch first. Trial runs from 100 pcs, then series production on a framework agreement.
Confidentiality. NDA signed on request; drawings never shared outside the project team.

Input	2D / 3D drawing, or physical sample
Trial batch	From 100 pcs
Series	Annual volume under framework agreement
Sample lead time	7 – 15 days
Quotation	Within 24 hours of a complete drawing
Packing	Export carton and pallet, customer label on request

04 — Quality

Quality control and traceability

We are IATF 16949 certified, which sets the discipline: documented process parameters, first-article approval, and a paper trail from incoming material to the packed carton.

IATF 16949 DIN 74361-3 ISO 898-1 Dacromet CNAS report

First article and patrol inspection on every batch.
Hardness and material verification against the drawing.
Batch traceability by material batch and heat-treat lot.
PPAP documentation for automotive customers where required.
Environmental test reports for Dacromet and zinc-nickel finishes.

Have a part that nobody wants to quote?

Send the drawing with material, tolerance and annual volume. We will tell you within one working day whether we can make it, and at what price.

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