Description

AM Steel Truss Head Self Tapping Screws feature an extra-wide, low-profile truss (also called mushroom or oven) head paired with an aggressive, coarse self-tapping thread that cuts and forms its own mating thread as it’s driven — fastening sheet metal, plastic, and thin materials without a pre-tapped hole or separate nut. Manufactured under the AM Steel brand, these self-tapping screws are the go-to fixing wherever the head must span a wide area, cover an oversized or slotted hole, or resist pulling through soft or thin material – driven with a Phillips or slotted driver into a punched or pilot hole.

Because the truss head is significantly wider and lower than a standard pan head, AM Steel truss head self tapping screws are well suited to thin sheet metal, soft plastics, mesh and perforated panels, canvas and fabric fixings, and any joint where a larger bearing surface prevents the head from pulling through or crushing the material. The broad, slightly domed head also spans elongated or oversized holes cleanly and delivers a neat, low-profile finished appearance. The self-forming thread taps directly into the base material for a tight, secure grip. They’re offered with Type AB thread (a sharp gimlet point for thin sheet, plastic, and soft materials) or Type C thread (a blunt machine-screw-style point for thicker or harder stock), in Phillips or slotted drive. AM Steel truss head self tapping screws are available in case-hardened carbon steel (zinc-plated or black finish) for general indoor fabrication, and in stainless steel (A2/304 and A4/316, the latter considered marine-grade) for outdoor, humid, or corrosion-prone environments.

Whether you’re fixing thin sheet metal, fastening soft or perforated panels, covering slotted or oversized holes, or handling any light-gauge assembly where maximum head bearing matters, AM Steel truss head self tapping screws deliver the wide-bearing grip, pull-through resistance, and consistent quality needed for thin-material and sheet-metal connections. As with all AM Steel products, this self tapping screw is available in a range of metric self-tapping sizes (typically ST2.2 to ST6.3 per ISO 1478, lengths from 6mm to 50mm), in multiple drives, thread forms, materials, and finishes to suit both industrial-grade and everyday fastening needs.

Key features:

• Extra-wide, low-profile truss (mushroom) head for maximum bearing surface and pull-through resistance
• Coarse, self-tapping thread that forms its own mating thread in sheet metal, plastic, and thin materials
• Spans oversized, elongated, or slotted holes cleanly with a neat low-profile finish
• Available in Phillips and slotted drives, and Type AB (sharp point) / Type C (blunt point) thread forms
• Available in case-hardened carbon steel (zinc-plated, black) and stainless steel (A2/304, A4/316)
• Backed by the quality assurance of AM Steel

Ideal For

AM Steel Truss Head Self Tapping Screws are ideal for:

• Sheet-metal fabricators fixing thin-gauge sheet where a wide head prevents pull-through
• Panel and mesh installers fastening perforated, mesh, or soft panels needing a broad bearing surface
• Assembly over oversized or slotted holes where the wide head must span and cover the opening
• Canvas, fabric, trim, and soft-material fixing requiring maximum head coverage without tearing through
• DIY and maintenance users needing a wide-bearing, low-profile fixing for thin or soft materials

Choosing the Right Truss Head Self Tapping Screw

Selecting the correct truss head self tapping screw from the AM Steel range depends on several factors:

• Material – Stainless steel (A2/304 or A4/316) for outdoor, humid, or corrosion-prone applications; case-hardened carbon steel for general indoor sheet-metal and panel work.
• Head Bearing Need – Choose truss when the material is thin, soft, perforated, or slotted and a standard pan head would pull through; the wider head spreads load and spans openings.
• Thread Form – Type AB (sharp gimlet point) for thin sheet, plastic, and soft materials; Type C (blunt machine-screw point) for thicker or harder stock.
• Drive Type – Phillips for faster, cam-out-resistant power driving; slotted for simple hand-driven, controlled tightening.
• Size & Length – Choose a diameter and length that gives full thread engagement through the base material without excessive protrusion on the reverse side.
• Pilot Hole Size – Match the pilot or punched hole to the screw’s root diameter – too small risks stripping or breakage, too large weakens the grip.

Strategies to Choose the Right Product

• Choose truss to stop pull-through – When fixing thin, soft, mesh, or perforated material, the wide truss head spreads load far better than a standard pan head and resists pulling through.
• Use it to span oversized or slotted holes – The broad head cleanly covers elongated or enlarged openings where a smaller head would sink in or slip through.
• Match the thread form to the material – Use Type AB for thin sheet and plastic; Type C for thicker or harder stock where a finer, machine-style thread grips better.
• Pick the drive for the method – Phillips for high-speed power driving; slotted for controlled hand-driven work.
• Match material to environment – Use stainless steel (A2/304 or A4/316) for outdoor, humid, or coastal work; case-hardened carbon steel for general dry, indoor fabrication.
• Consider bulk vs. individual packs – Bulk packs suit production fabrication and repeat assembly; smaller packs suit repairs, servicing, or single jobs.

Mechanical Properties

AM Steel Truss Head Self Tapping Screws are manufactured to meet recognized mechanical and dimensional standards, ensuring reliability across thin-sheet, soft-material, and wide-bearing assembly applications:

These mechanical ratings confirm that AM Steel truss head self tapping screws deliver wide-bearing, pull-through-resistant holding power suited to thin-sheet, soft-material, and panel applications – size the pilot hole to the screw’s root diameter for best results and to reduce stripping risk.

Frequently Asked Questions (FAQs)

1. What is a truss head self tapping screw used for?
It’s used to fasten thin sheet metal, soft plastics, mesh, and perforated panels where a wide head is needed to prevent pull-through or to span an oversized or slotted hole, forming its own mating thread as it’s driven with no separate nut.

2. What is a truss head?
A truss head (also called a mushroom or oven head) is an extra-wide, low-profile, slightly domed head that provides a much larger bearing surface than a standard pan head, spreading load over a wider area.

3. Why choose a truss head over a pan head?
A truss head is wider and lower than a pan head, giving greater bearing surface to resist pull-through in thin or soft materials and to cleanly span oversized, elongated, or slotted holes.

4. Are AM Steel truss head self tapping screws different from generic ones?
AM Steel self tapping screws are manufactured and quality-tested under the AM Steel brand, ensuring consistent thread quality, point sharpness, head dimensions, and finish across every batch.

5. What’s the difference between Type AB and Type C self tapping screws?
Type AB has a sharp gimlet point suited to thin sheet, plastic, and soft materials, while Type C has a blunt machine-screw-style point with a finer thread suited to thicker or harder stock.

6. What sizes do truss head self tapping screws come in?
AM Steel truss head self tapping screws are available in a range of sizes, typically ST2.2 to ST6.3 in metric self-tapping designation, with lengths from 6mm to 50mm, per ISO 1478.

7. Do I need a pilot hole for a truss head self tapping screw?
Usually yes – a pilot or punched hole sized to the screw’s root diameter is recommended in metal and harder materials to prevent stripping, splitting, and breakage; some thin or soft materials accept the sharp point without pre-drilling.

8. What drive types are truss head self tapping screws available in?
AM Steel truss head self tapping screws are commonly available in Phillips (cross-recess) for fast, cam-out-resistant power driving and slotted for simple hand-driven, controlled tightening.

9. What’s the difference between a self tapping and a self drilling screw?
A self tapping screw needs a pre-made pilot hole and forms the thread only, while a self drilling (Tek) screw has a drill-point tip that bores its own hole and taps the thread in a single action, needing no pilot hole.

10. Are truss head self tapping screws corrosion-resistant?
Yes, especially AM Steel stainless steel versions (A2/304 or A4/316), which resist rust in outdoor, humid, or coastal environments; zinc-plated carbon steel offers basic protection for indoor and dry conditions.

11. Can truss head self tapping screws be used in plastic?
Yes – with a correctly sized pilot hole, self tapping screws (particularly sharp Type AB) form a secure thread in many plastics, and the wide truss head helps prevent crushing or pull-through in softer plastics.

12. Can truss head self tapping screws be reused?
They can often be reinstalled into the same formed thread if it isn’t stripped, though repeated removal weakens the hold; for a loose hole, a slightly larger-diameter screw restores grip.

13. What’s the difference between A2 and A4 stainless steel self tapping screws?
A2 (304) stainless offers good general corrosion resistance for most indoor and outdoor use, while A4 (316), considered marine-grade, provides superior resistance to chlorides and coastal or chemical environments.