Self-Drilling Screws
Hex Washer Head Self-Drilling Screw with EPDM Washer
DIN 7504K indented hex washer head roofing screw with bonded EPDM washer, ST4.2–ST6.3, drill points #1–#5.
DIN 7504 KST4.2
Screw manufacturer in Shanghai, China
Construction screws, made to spec
Self-drilling, bi-metal, drywall, chipboard, concrete and wood screws for importers, distributors and OEMs. DIN, ISO and AS 3566 grades with lot test reports and free samples in 7 days.
- 500 tMonthly production capacity
- 9 families44 core screws in thousands of sizes
- 3,000 hSalt spray with bi-metal and ceramic coatings
- 7 daysFree samples by courier
Produced to
- DIN 7504
- ISO 15480
- AS 3566Class 3 & 4
- DIN 7505
- DIN 571
- ASTM C1002
- ISO 9001quality system
Product range
Screws for every layer of a building
From the drill point on a roofing screw to the thread on a confirmat, each family is produced to its own standard and tested lot by lot.
View the full catalogue
Self-Drilling Screws
Tek screws that drill, tap and fasten in one pass on steel up to 12.5 mm.
Bi-Metal Screws
Stainless 304/316 bodies welded to a hardened drill tip for corrosive sites.
Drywall Screws
Bugle head screws for gypsum board on timber or steel studs, loose or collated.
Chipboard Screws
Double countersunk particleboard and timber screws in Pozi or Torx drive.
Wood & Timber Screws
Hex lag screws, confirmat, pocket hole and DIN 7997 wood screws.
Concrete & Masonry Screws
Hardened masonry screws and screw anchors for concrete, brick and block.
Self-Tapping Screws
Sharp-point sheet metal screws to DIN 7981, ISO 7049 and ISO 7053.
Machine Screws
Metric machine screws and socket cap screws in steel and stainless steel.
Specialty Fasteners
Solar hanger bolts, eye screws and hook screws.
500 tscrews produced every month
About the factory
Made in-house, from wire coil to labelled carton
Cold heading, point forming, thread rolling, heat treatment, coating and washer assembly all happen under one roof in our Shanghai operation.
Buyers deal directly with sales engineers who read fastener drawings and work beside the production team, so a specification is understood the first time and tracked against your lot number all the way to the container.
- 8Controlled production steps
- 44Core products, made to order
- ISO 9001Quality management system
- 24 hReply to every inquiry
Best sellers
Most requested screws
Add products to your inquiry list and send one request for all of them.
Self-Drilling Screws
Hex Flange Head Self-Drilling Screw
Galvanised hex flange head Tek screw with integral serrated flange, for steel-to-steel framing and cladding.
ST3.5–ST6.3Carbon steel
Self-Drilling Screws
Colour Painted Hex Head Roofing Screw
Self-drilling roofing screws with heads powder-painted to match RAL and Colorbond sheet colours.
DIN 7504 KST4.8
Self-Drilling Screws
Sandwich Panel Self-Drilling Screw
Long hex washer head screws with a secondary thread to clamp insulated sandwich panels to steel purlins.
ST5.5C1022 steel
Bi-Metal Screws
Bi-Metal Hex Washer Head Self-Drilling Screw
SS304 or SS316 body welded to an SS420 drill tip, indented hex washer head with SS + EPDM washer, M4.8–M7.
M4.8SS304 or SS316
Bi-Metal Screws
Bi-Metal Wafer Head Self-Drilling Screw
SS316 + SS420 wafer head Phillips screw with ceramic coating, 5.5 × 40 mm standard, for aluminium-to-steel joints.
5.5 × 40 mmSS316
Bi-Metal Screws
Bi-Metal Pan Head Self-Drilling Screw
SS316 + SCM435 pan head Phillips screw, 5.5–14 × 25/32/38 mm, salt spray 500–3,000 h.
5.5–14 × 25 / 32 / 38 mmSS304 or SS316
Bi-Metal Screws
Bi-Metal Flat Head Screw with Wings
SS316 + SS420 countersunk reamer screw with wings, ceramic coated 500/1,000 h, for timber or board on steel.
5.5 × 40 mm standardSS316
Drywall Screws
Coarse Thread Drywall Screw, Black Phosphate
Bugle head Phillips drywall screw in C1022A steel, coarse thread for timber studs, 3.5–5.5 mm, black phosphate.
GBM3.5–M5.5
Drywall Screws
Fine Thread Drywall Screw
Black phosphated C1022A bugle head screw with fine thread for light-gauge steel studs, 10 mm head.
3.5C1022A
Drywall Screws
Zinc Plated Drywall Screw
C1022 bugle head drywall screw, 3.5 × 25 mm (#6 × 1") and all sizes, blue-white zinc plated.
3.5 × 25 mmC1022
Drywall Screws
Collated Drywall Screw (Plastic Strip)
Belted 3.5 × 25 mm drywall screws on plastic strip coils for auto-feed screw guns.
ISO3.5 × 25 mm
Chipboard Screws
Double Countersunk Pozi Chipboard Screw
C1022 chipboard screw, double countersunk head, Pozi drive, M2.5–M6, zinc plated, carbon or stainless steel.
DIN 7505 AM2.5–M6.0
Chipboard Screws
White Zinc Chipboard Screw
Blue-white zinc plated double countersunk Pozi chipboard screw to DIN 7505 with sharp point.
DIN 75053.0–6.0 mm
Chipboard Screws
Yellow Zinc Star Drive Chipboard Screw
Torx drive double countersunk wood screw, yellow zinc plated, class 4.8 and 6.8, full sizes.
3.0–6.0 mmCarbon steel
Chipboard Screws
Stainless Steel Square Drive Deck Screw
SS410 countersunk head with nibs, square drive, M3.9–M4.2 × 25–50 mm, for decking and outdoor furniture.
DINM3.9
Concrete & Masonry Screws
Blue Ceramic Hex Washer Head Concrete Screw
3/16" and 1/4" hex washer head masonry screws with blue ceramic coating and Hi-Lo thread.
3/16"Carbon steel
Concrete & Masonry Screws
Flat Head Masonry Screw
Phillips countersunk concrete screw in blue, white or black coating for flush fixing into masonry.
3/16"Hardened carbon steel
Concrete & Masonry Screws
High-Low Thread Concrete Screw, Ceramic Coated
Concrete spoon-point screw with high-low thread, anti-slip ribs under head, colour ceramic coatings to C4.
DINHardened steel
Concrete & Masonry Screws
Stainless Bi-Metal Concrete Screw Anchor
SS304/SS316 + SS420 bi-metal screw-in bolt with hex head, metric and inch, for wet and outdoor concrete.
DIN6–14 mm
Wood & Timber Screws
DIN 571 Hex Head Lag Screw
Hex head wood screw (coach screw) to DIN 571, M4–M20 × 16–200 mm, zinc plated or stainless steel.
DIN 571M4–M20
Wood & Timber Screws
Washer Head Pocket Hole Screw
Pocket hole screws with a flat washer head that seats in the pocket, colour coded, zinc plated.
DIN#7
Wood & Timber Screws
Confirmat Furniture Screw
Hex socket flat head confirmat screw for flat-pack furniture, 7 × 50 mm and other sizes, zinc plated.
DIN5 × 40
Wood & Timber Screws
DIN 7997 Countersunk Wood Screw
Phillips countersunk wood screw to DIN 7997 / EN 14592, partial thread, yellow zinc, Ø3–6 × 16–100 mm.
DIN 79973.0–6.0 mm
Why buyers choose us
Fewer surprises between sample and container
The things importers ask us about most, built into how every order runs.
Specification in writing
Standard, point, hardness, coating, washer and packing are confirmed on paper before tooling starts.
Lot test reports
Hardness, case depth, drill time and salt spray results ship with every order.
Factory prices
You buy from the plant that runs the headers and furnaces, not from a middleman.
Mixed containers
Combine sizes and product families in one container; stock items in smaller lots.
Custom screws
Non-standard lengths, head marks, coatings and drawings are routine work.
Bi-metal know-how
SS304 and SS316 bodies welded to hardened tips for coastal and solar projects.
Export paperwork
Commercial invoice, packing list, certificate of origin and MTC for every shipment.
One contact
A sales engineer answers on email or WhatsApp within one business day.
Engineering
Every part of a self-drilling screw is specified
Hover or tab through the drawing. Each feature is a line on your purchase order, and each one is checked before the lot is released.
- Raw material
- C1022, 10B21, SS304, SS316, SS410
- Surface hardness
- ≥ 530 HV0.3, case depth 0.05–0.28 mm
- Drilling capacity
- 0.7 to 12.5 mm steel by point size
- Corrosion
- 72 h zinc to 3,000 h bi-metal and ceramic
- Indented hex washer headNut-setter drive, DIN 7504 K
- Bonded EPDM washerSeals the hole, 14–19 mm
- Rolled ST threadC1022 steel or bi-metal SS304/316
- Pilot sectionClears the steel before the thread bites
- Drill point #1 to #5Drills 0.7 to 12.5 mm steel
StandardDIN 7504 K
SizeST5.5 × 32
Hardness≥ 530 HV
Applications
Where our screws go to work
Typical projects and the fastening specification behind each one.
All projects
Solar energy
Rooftop solar on trapezoidal metal roofs
Industrial buildings
Steel warehouse with sandwich panel roof and walls
Interior construction
Commercial drywall fit-out on steel studs
Landscaping & timber
Hardwood decking and timber structures
Architectural facades
Coastal facade and aluminium cladding
Manufacturing
From wire coil to carton in eight steps
Each step has a check recorded against your lot number.
Wire drawing
Annealed C1022, 10B21 or stainless wire is drawn to the exact blank diameter.
Cold heading
Multi-station headers form the head, washer face and recess in one stroke.
Point forming
Drill points are milled or pinch-pointed, then checked for flute length.
Thread rolling
Flat dies roll ST, Hi-Lo or Type 17 threads without cutting the grain.
Heat treatment
Mesh-belt furnaces carburise to 530 HV or more over a tougher core.
Coating
Zinc, yellow zinc, zinc flake, ceramic or painted heads to your exposure class.
Washer assembly
EPDM washers are vulcanised to steel or stainless backing and pre-assembled.
Testing and packing
Hardness, case depth, drill time and salt spray per lot, then packed to your labels.
Quality control
Tested lot by lot, documented with your shipment
Every carton label traces back to a wire coil, a furnace batch and a set of test results.
- Surface hardnessVickers HV0.3
- Case depthMicrosection
- Drill timeStandard steel plate
- Break torqueISO 10666
- Salt sprayISO 9227
- Final inspectionAQL sampling
ISO 9001Quality management system
MTCMaterial test certificate per lot
3rd partySGS, BV or your inspector welcome
OEM and private label
Packed under your brand, ready for the shelf
From 100-piece retail boxes to 25 kg bulk cartons, we pack to your artwork, barcodes and language.
- Small boxes
- Plastic buckets
- Blister cards
- Bulk cartons
- Custom head marks
- Your labels & barcodes
- Fumigated pallets
- Mixed containers
How to order
From inquiry to container
Four steps, usually five to six weeks for a first order.
Send your specification
Size, standard, finish and quantity, or a sample or drawing. We reply within one business day.
Approve samples
Free samples from production tooling ship by courier within 7 days.
Production
25–35 days after deposit, with in-process photos and lot test records.
Inspection and shipping
Third-party inspection welcome. FOB, CFR or CIF with full export documents.
Questions buyers ask first
Are you a screw factory or a trading company?
China Screw Factory is operated by Shanghai Mars Industrial Co., Ltd. We manufacture self-drilling, bi-metal and construction screws and work with audited partner plants for specialty items, so every order is quoted at factory prices with one point of contact.
What is your minimum order quantity?
Most standard screws start from about 500 kg or 50,000 pieces per size. Several sizes can share one container, and stock sizes can ship in smaller lots.
Can I get free samples?
Yes. Up to 20 pieces per size are free and ship by courier within 7 days. Buyers usually cover the courier cost, which we credit against the first order.
Which standards do you produce to?
DIN 7504, ISO 15480–15483, DIN 7505, DIN 571, DIN 7997, DIN 7981, DIN 965, DIN 912, AS 3566 and customer drawings.
What are your payment and shipping terms?
T/T with 30 % deposit and 70 % against copy of the bill of lading, or L/C at sight. We quote FOB Shanghai or Ningbo, CFR or CIF to your port.
Do you offer private label packing?
Yes. Boxes, buckets, blister cards and cartons can carry your brand, barcodes and multilingual labels.
Request for quotation
Get a quotation within one business day
Tell us the screw, size and quantity. A sales engineer replies within one business day with price, lead time and a sample offer.
- Email[email protected]
- WhatsApp+86 176 2154 1688
- Phone+86 176 2154 1688