Self-Tapping Screws
Hex Washer Head Self-Tapping Screw
Galvanised carbon steel hex washer head tapping screw, class 4.8 and 6.8, inch and metric, ISO 7053.
ISO 7053ST3.5–ST6.3
Self-Tapping Screws
Self-tapping screws form a mating thread as they are driven into thin metal, plastic or wood. They suit HVAC ductwork, enclosures, appliances and light framing where a pilot hole is already drilled or the material is thin enough to pierce.
Self-Tapping Screws
Pan Head Self-Tapping Screw, DIN 7981
DIN 7981 / ISO 7049 pan head Phillips sheet metal screw, SS410 zinc plated, 2.9–6.3 × 9.5–50 mm.
DIN 79812.9–6.3 mm
Self-Tapping Screws
Modified Truss Head Self-Tapping Screw
K-Lath style modified truss head sharp-point screw, 10 mm head, zinc plated, for sheet metal and studs.
#8Carbon steel
Self-Tapping Screws
Stainless Indented Hex Washer Head Self-Tapping Screw
A2 stainless indented hex washer head tapping screw, e.g. 1/4" (#14) × 3/4", slotted option, 100 % inspected.
#8–#14 × 1/2"–2"A2 (304) stainless
Self-Tapping Screws
Pan Framing Head Screw, Black Phosphate
Black phosphated pan framing head screw for steel stud to track connections, sharp or drill point.
DIN#7 × 7/16"
Buying guide
How to specify self-tapping screws
Three decisions that prevent most problems on site.
Pilot hole
For sheet metal, drill a pilot of about 85 % of the minor thread diameter. Too small and the screw strips; too large and it will not hold.
Head style
Pan heads are general purpose; modified truss heads have a low, wide bearing face for fixing sheet to studs; hex washer heads take high torque from a nut setter.
Material
Case-hardened carbon steel taps into steel; A2 stainless taps aluminium and soft materials; SS410 combines hardness with moderate corrosion resistance.
Applications
Projects using self-tapping screws
Self-Tapping Screws: common questions
What is the difference between ST and M sizes?
ST sizes (ST3.5, ST4.2…) are tapping-screw threads per ISO 1478. M sizes are machine threads and need a tapped hole or nut.
Can stainless self-tapping screws tap steel?
A2 stainless is softer than hardened steel, so it works only in thin or soft sheet. Use SS410 or bi-metal screws for steel.
Do you offer head marking?
Yes, embossed or recessed head marks are available on most head styles with a one-off tooling charge.
Request for quotation
Quote for self-tapping screws
Tell us the screw, size and quantity. A sales engineer replies within one business day with price, lead time and a sample offer.
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