Drawing review
Send a PDF, STEP or a photo of the part with dimensions. We reply with the standard we would make it to and any dimension we cannot hold — usually within two working days.
Capabilities
One plant, six processes, one lot number.
Everything that decides whether a bolt holds — the heading, the thread, the heat treat, the coating — happens in Cixi. Nothing is sent out and brought back with someone else’s paperwork, with one honest exception: hot-dip galvanizing runs at a partner plant 40 minutes away.
Process range
What the equipment can hold.
Ranges below are the limits we will quote without a deviation. Outside them we say so before taking the order, rather than after the first inspection — a part that is marginal on the die is a part that fails at lot four.
| Process | Range | How it is controlled |
|---|---|---|
| Cold heading | M4 – M30 · up to 120 pcs/min | 2-die 3-blow, in-house tool room |
| Thread rolling | M4 – M30 · 6g / 6H | Flat-die and planetary, rolled after heat treatment where required |
| Heat treatment | 8.8 / 10.9 / 12.9 · 45H | Continuous mesh-belt quench and temper, hardness surveyed per basket |
| Hot-dip galvanizing | M6 – M30 · 45 – 85 µm | EN ISO 10684 at a partner plant, centrifuged and re-tapped after coating |
| Zinc plating | Alkaline zinc 5 – 12 µm | Trivalent passivation, RoHS compliant, barrel and rack |
| Zinc flake | 8 – 12 µm | Dacromet-type coating for high-corrosion joints, no hydrogen embrittlement |
| Black oxide | 0.8 – 1.5 µm | For class 12.9 socket products, oiled finish |
| Optical sorting | 100% of production | Camera sort for length, head cracks and thread defects, plus manual AQL |
Finishing
Corrosion resistance you can specify.
Salt-spray hours are typical results on our own coupons, not a guarantee for your environment. Where a project has a corrosion class — ISO 12944 C3, C4, C5 — send it and we match the coating to it instead of guessing in µm.
| Finish | Coating thickness | Neutral salt spray | Typical use |
|---|---|---|---|
| Zinc plated, trivalent | 5 – 12 µm | 96 – 240 h | Indoor machinery, automotive interiors |
| Hot-dip galvanized | 45 – 85 µm | 480 h + | Outdoor structures, marine atmosphere |
| Zinc flake | 8 – 12 µm | 720 h | Under-hood, coastal, high-humidity |
| Black oxide | 0.8 – 1.5 µm | 24 – 48 h | Tooling, machine tools, class 12.9 |
| Stainless passivated | — | 500 h + | Food equipment, chemical exposure |
ASTM B117, neutral salt spray, red-rust hours. A zinc flake part at 720 h is not “better” than hot-dip at 480 h if the joint needs a coating that survives handling — thickness and adhesion are separate questions.
Tooling & samples
Non-standard parts, quoted honestly.
A new heading die is a real cost, and we would rather show it on the quote than hide it in the unit price.
Tooling
Heading dies and thread rolls are quoted separately, typically $180 – $650 per die set depending on size, with a 10–15 day lead time. The charge is credited against the first production order.
First article
FAI report with dimensions, hardness, tensile and coating thickness before the run continues. PPAP level 3 available on request; we are ISO 9001, not IATF 16949, and say so up front.
Packing
Packed for the way your line feeds.
- Cartons
- 10 / 20 / 25 kg double-wall
- Pallets
- 900 – 1,100 kg heat-treated
- Labels
- Your spec PDF or Excel
- Bagging
- Zip / VCI on request
Equipment questions
What the plant can and cannot do.
The limits are the useful part of this page. Ask for the ones that matter to your part.
What is actually in-house versus subcontracted?
Heading, thread rolling, heat treatment, zinc plating, zinc flake, black oxide and optical sorting are in-house. Hot-dip galvanizing is the one exception: it runs at a partner plant 40 minutes away, and the lot still carries our number and our inspection.
What can you not make?
No cold-formed part above M30, no machining-heavy specials, no titanium, and no fastener that needs a forged head beyond our press capacity. We quote those through partners only when you ask us to, and we say who makes them.
How is a new die quoted?
Die sets run roughly US$180 – 650 depending on size and stations, with a 10 – 15 day tooling lead time. The charge is credited against the first production order, and the die belongs to the part, not to a separate invoice you have to argue about.
Send a drawing
Got a part number and a tolerance?
Send it with the annual volume and the destination port. We will come back with a process route, a MOQ and a price — or a straight answer that it is outside our range.