Self-Tapping Screws

Thread-forming sheet-metal screws that tap their own thread in pre-drilled holes: pan head DIN 7981 / ISO 7049, countersunk DIN 7982 / ISO 7050 and hex washer head types, ST2.9 to ST6.3. Case-hardened carbon steel (C1022) or stainless 304/410. Zinc-nickel finish gives HVAC, automotive and appliance makers far longer protection than standard blue zinc.

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Self-Tapping Screws we supply

DIN 7981 Pan Head Tapping Screw – representative photo

DIN 7981 Pan Head Self-Tapping Screw

DIN 7982 Countersunk Tapping Screw – representative photo

DIN 7982 Countersunk Self-Tapping Screw

Hex Washer Head Tapping Screw – representative photo

Hex Washer Head Self-Tapping Screw

Self-Tapping Screws: standards, sizes and options
Product / standard	Sizes	Grades	Material	Finishes	MOQ
DIN 7981 / ISO 7049 DIN 7981 Pan Head Tapping Screw	ST2.9 – ST6.3	Case hardened (ISO 2702), A2	Carbon steel C1022; Stainless 304 / 410	Zinc plated, Zinc-nickel, Black oxide / phosphate	500 pcs / size
DIN 7982 / ISO 7050 DIN 7982 Countersunk Tapping Screw	ST2.9 – ST6.3	Case hardened (ISO 2702), A2	Carbon steel C1022; Stainless 304	Zinc plated, Zinc-nickel, Black oxide / phosphate	500 pcs / size
DIN 7976 / ASME B18.6.4 Hex Washer Head Tapping Screw	ST3.5 – ST6.3; #8 – #14	Case hardened	Carbon steel C1022; Stainless 410	Zinc plated, Zinc-nickel	500 pcs / size

Ordering self-tapping 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-tapping 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 plated	Our own line	Clear/blue, yellow or black passivation
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
Black oxide / phosphate	Available	Indoor or oiled service

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

Self-tapping or self-drilling?: Self-tapping screws need a pilot hole. If you want to drill and fasten in one step through steel up to about 6 mm, choose a self-drilling screw.
Point type C or F?: Type C (pointed) is for thin sheet; type F (flat) for thicker metal or plastic bosses.

Request a self-tapping screw quote

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