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Mushroom Head

Mushroom Head

Mushroom Head

Not sure what size or thread you have or need?

Two ways to confirm before you order - whichever you already know about your fastener.

1If you know the fastener diameter

Compare your fastener to our visual size guide to confirm M-size, pitch and length.

Open the identification guide ›

2If you have the driver bit

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.

Browse driver bits ›

Mushroom head machine screws have a wide, low domed head with a large flat bearing face beneath. The broad head spreads load and gives a smooth, rounded finish with no sharp edges, sitting lower and wider than a pan head. They are fully threaded for tapped holes or a matching nut.

Also known as: Truss-style Head, Wide Dome Head, Mushroom Head.

Used where a clean, wide, snag-free head is wanted - covers, trim, signage and panel fixing - and where a larger bearing surface helps on softer or thinner material.

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 zinc plated, black zinc and G304 stainless.

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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