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Thread Rolling Screws
Compare your fastener to our visual size guide to confirm M-size, pitch and length.
Match your driver bit to the screw recess - Phillips, Pozi, slot or internal hex. Our Driving range lists the bit size for every drive type we stock.
Thread rolling screws (thread-forming screws) form their own mating thread by displacing material as they drive into a pre-drilled pilot hole in metal or plastic. Because the thread is rolled rather than cut, there are no chips, the fit is tight and vibration-resistant, and the joint is stronger than a tapped one.
Also known as: Thread-forming Screws, Taptite-style Screws, Trilobular Screws.
Used in sheet metal, castings, extrusions and plastics where pre-tapping every hole is not practical - a single correctly sized pilot hole is all that is needed.
HOW THEY WORK
Drill a pilot hole to the recommended size, then drive the screw - the lobed thread form rolls a matching thread as it goes. No tap is required, and the absence of chips keeps the assembly clean.
DRIVE TYPES
Phillips (PH1 and PH2) - the common drive across this range. Matching bits are in our Driving section.
Slot - traditional flat-blade drive for electrical, plumbing and heritage work.
MATERIALS
Stocked in case-hardened carbon steel with a zinc plated finish.
THREAD SYSTEMS
Available in metric coarse and fine, plus imperial (UNC/UNF and BSW) threads. Machine screws are fully threaded with a uniform diameter and need a pre-tapped hole or a matching nut - they do not cut their own thread.
WHY AUSTRALIA TRUSTS BOLT & NUT
With 15+ years selling fasteners online from Brisbane, we hold over 25,000 stock lines and 200 million pieces - 98.75% of online orders placed before 1pm leave same day. Save more as you buy more - we offer up to 13 price breaks plus 3 spend-tier discounts. Read our customer reviews or get in touch if you need help picking the right machine screw.
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Thread-forming screws that roll their own mating thread into a pre-drilled pilot hole - no tapping and no chips, producing a tight, strong joint. Hardened steel in zinc plated finish.
TECHNICAL RESOURCES
Key charts and specification sheets: Imperial vs Metric Strength Chart
For the full library, see our Technical PDF's Library.
