A screw factory that writes the specification down
China Screw Factory is operated by Shanghai Mars Industrial Co., Ltd. We make self-drilling, bi-metal and construction screws for importers, distributors and OEMs, and agree every detail in writing before production starts.
- 500 tmonthly capacity
- ISO 9001quality system
- 44core products
- Shanghaiexport office
Engineers and production staff under one roof
Buyers talk to one sales engineer, and that engineer can walk onto the shop floor.
Our team in Shanghai combines people who read fastener drawings with the staff who run the headers, thread rollers and furnaces. That is why a specification is understood the first time, and why lot records follow your order all the way to the container.
We focus on screws for building and construction: roofing and cladding, steel framing, drywall, timber and masonry. For machine screws and specialty parts we work with partner plants we audit ourselves, so you can source a full container from one supplier.
- 8Controlled production steps
- 9Product families
- 3,000 hTop salt spray rating
- 1 dayReply time to inquiries
Everything needed to turn wire into a tested screw
Six in-house processes, each with its own checks.
Cold heading
Multi-station headers for hex washer, flange, wafer, pan, countersunk and bugle heads, ST2.9 to ST6.3 and M2 to M20.
Thread rolling
ST, Hi-Lo, twin-lead, knurled and machine threads, rolled rather than cut.
Heat treatment
Mesh-belt carburising and tempering furnaces with recorded temperature profiles.
Coating
Zinc, yellow zinc, zinc flake, ceramic and colour-painted heads.
Bi-metal and washers
SS304/SS316 bodies welded to hardened tips; EPDM washers vulcanised and pre-assembled.
Testing
Hardness, case depth, drill time, torque and salt spray for every lot.
Every lot traceable from wire coil to carton label
| Check | Method |
|---|---|
| Incoming wire | Chemical composition certificate, diameter |
| Dimensions | Head, thread, point and length against drawing |
| Surface hardness | Vickers HV0.3, typically ≥ 530 HV for carbon steel |
| Case depth and core | Microsection per furnace batch |
| Drilling performance | Drill time on standard steel plate |
| Torsional strength | Break torque per ISO 10666 |
| Corrosion | Neutral salt spray per ISO 9227 |
| Final inspection | AQL sampling before packing |
Packed to your labels, loaded from Shanghai or Ningbo
Small boxes, plastic buckets, bags or bulk cartons up to about 25 kg on fumigated wooden or plastic pallets. Labels, barcodes and inserts in your language and brand. A 20 ft container carries roughly 20 to 24 tons of screws, shipped with commercial invoice, packing list, certificate of origin and test reports.
Product lines tuned to regional codes
We build to the standard your market inspects against.
Australia and New Zealand
AS 3566 Class 3 and 4 roofing screws, Type 17 timber screws and bi-metal screws for coastal sites.
Europe
DIN 7504 self-drilling screws, DIN 7505 chipboard screws, DIN 571 lag screws and EN 14592 timber screws.
Americas, Middle East and Africa
Inch-size Tek and drywall screws, masonry screws, sandwich panel screws and colour-painted roofing screws.
Who you are dealing with
Contracts, invoices and export documents are issued by the company below.
| Legal name | Shanghai Mars Industrial Co., Ltd. |
|---|---|
| Trading as | China Screw Factory |
| Location | Shanghai, China |
| inquiry@china-screw-factory.com | |
| Phone and WhatsApp | +86 176 2154 1688 |
| Office hours | Mon–Sat, 08:30–18:00 (GMT+8) |
Talk to a sales engineer
Tell us the screw, size and quantity. A sales engineer replies within one business day with price, lead time and a sample offer.
- Emailinquiry@china-screw-factory.com
- WhatsApp+86 176 2154 1688
- Phone+86 176 2154 1688