Can you colour-match roofing screw heads?

Yes, painted heads in RAL colours are available on hex washer head roofing screws.

Self-Drilling Screws

Self-drilling screws (Tek screws) drill, tap and fasten in one operation — the standard fastener for metal roofing, cladding, steel framing and HVAC ductwork. We supply DIN 7504 K hex washer head (with or without bonded EPDM washer), wafer / modified truss head and DIN 7504 P/O countersunk types, sizes #8 to #14 (4.2–6.3 mm), drill points #2 to #5. Zinc-nickel plating keeps roofing screws free of red rust far longer than standard zinc, which matters on exposed roofs.

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Self-Drilling Screws we supply

DIN 7504 K Hex Tek Screw – representative photo

DIN 7504 K Hex Washer Head Self-Drilling Screw

Wafer Head Tek Screw – representative photo

Wafer Head (Modified Truss) Self-Drilling Screw

DIN 7504 P Countersunk Tek Screw – representative photo

DIN 7504 P Countersunk Self-Drilling Screw

Self-Drilling Screws: standards, sizes and options
Product / standard	Sizes	Grades	Material	Finishes	MOQ
DIN 7504 K / ISO 15480 DIN 7504 K Hex Tek Screw	4.2 – 6.3 mm (#8 – #14)	Case hardened, Bi-metal (stainless head + carbon point)	Carbon steel C1022; Stainless 410; Bi-metal 304/C1022	Zinc-nickel, Zinc plated, Zinc flake (Dacromet/Geomet type)	500 pcs / size
DIN 7504 (form M type) Wafer Head Tek Screw	#8 – #10 (4.2 – 4.8 mm)	Case hardened	Carbon steel C1022	Zinc plated, Zinc-nickel	500 pcs / size
DIN 7504 P / DIN 7504 O DIN 7504 P Countersunk Tek Screw	3.5 – 6.3 mm	Case hardened	Carbon steel C1022; Stainless 410	Zinc plated, Zinc-nickel	500 pcs / size

Ordering self-drilling screws

MOQ: 500 pcs per size (negotiable for trial orders)
Mixed sizes: Welcome in one order
Samples: Samples available — cost and lead time quoted per request
Lead time: 15–25 days for standard parts; finishes such as HDG or Dacromet add a few days
Payment: T/T 30% deposit, 70% before shipment
Shipping: FOB Ningbo / CIF / DDP on request
Packaging: Cartons on pallets, or private-label boxes and bags
Documents: Material certificate, coating thickness and salt-spray reports on request
Custom: Drawings, non-standard sizes, coatings, marking and private-label packaging

To quote quickly, please send

Standard (e.g. DIN, ISO, ASTM) or drawing number
Size × length and thread pitch
Property class / grade and material
Finish and coating thickness (or the salt-spray hours you need)
Quantity per size and annual volume
Packaging and destination port

Finishes for self-drilling screws

Zinc-nickel and zinc are plated on our own line in Ningbo. Other finishes are applied by specialist coaters to the relevant standard.

Finish	Applied	Notes
Zinc-nickel	Our own line	12–15 µm, clear or black passivation; 1,000 h (12 µm) to 1,440 h (15 µm) neutral salt spray
Zinc plated	Our own line	Clear/blue, yellow or black passivation
Zinc flake (Dacromet/Geomet type)	Available	Electrolyte-free, no hydrogen embrittlement risk

For property class 10.9 and above, choose zinc flake, or zinc-nickel with hydrogen-embrittlement relief agreed at order stage.

Row of zinc-nickel electroplating tanks — Our zinc-nickel plating line. Salt spray: 12 µm ≈ 1,000 h, 15 µm ≈ 1,440 h (neutral salt spray to first red rust). How zinc-nickel compares

How to choose

Which drill point?: Match point length to total steel thickness: #2 up to about 2 mm, #3 up to about 4.5 mm, #4/#5 for heavier sections.
With or without EPDM washer?: Roofing and cladding screws exposed to weather need the bonded EPDM washer for sealing; framing screws do not.

Request a self-drilling screw quote

Send sizes and quantities — we reply with price, finish options and lead time within 24 hours.

Technical guides

Zinc-Nickel Plating vs Zinc Plating: Which Coating for Your Fasteners? (2026 Guide)