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When a standard pan head or button head leaves too small a bearing footprint — causing pull-through in thin sheet metal, plastic panels, or wood composites — fabricators, maintenance technicians, and DIY builders reach for truss head machine screws. The wide dome profile of these M6 M8 M10 truss head screws spreads the clamping load over a significantly larger area, solving the pull-through problem without adding a separate washer.
Each screw is machined from 304 stainless steel (A2 grade) with a low-profile dome head and an Allen key (hex socket) drive. Available in three thread diameters — M6, M8, and M10 — with lengths ranging from 8mm (5/16") to 60mm (2-3/8") depending on diameter. Order in packs of 1 to 100 pieces to match your project scale, from single-unit repairs to production runs. The length listed excludes the head height, as noted in the variant selector.
These truss head Allen key screws are well-suited for sheet metal enclosures and electrical panels, furniture and fixture assembly where a finished dome appearance is required, automotive interior trim and body panels, and general fabrication where a wide-bearing low-profile fastener is needed without the bulk of a hex cap screw.
| Material | 304 Stainless Steel (A2 grade) |
|---|---|
| Head Style | Truss head (dome / mushroom head) |
| Drive Type | Allen key (hex socket / internal hex) |
| Thread Standard | ISO metric coarse thread |
| Thread Diameters | M6, M8, M10 |
| Available Lengths | M6: 8–60mm (5/16"–2-3/8") · M8: 10–60mm (3/8"–2-3/8") · M10: 16–60mm (5/8"–2-3/8") |
| Thread Pitch | M6: 1.0mm · M8: 1.25mm · M10: 1.5mm |
| Hex Key Size | Typically 4mm (M6) · 5–6mm (M8) · 6–8mm (M10) — confirm before assembly |
| Tensile Strength | Typically 500–700 MPa (304 SS) |
| Finish | Natural stainless — no plating or coating |
| Length Measurement | Excludes head height (thread shank only) |
| Pack Quantities | 1 / 2 / 3 / 5 / 10 / 15 / 20 / 25 / 50 / 100 pcs |
| Corrosion Resistance | Good — suitable for indoor and light outdoor use |
| Country of Origin | Contact us to confirm |
A reliable rule of thumb is to ensure at least 1.5× the screw diameter of thread engagement in the receiving material. For M6, that means at least 9mm of thread engagement; for M8, at least 12mm; for M10, at least 15mm. Add the thickness of all clamped parts to determine your minimum screw length.
Quick inch reference: 8mm ≈ 5/16" · 10mm ≈ 3/8" · 16mm ≈ 5/8" · 20mm ≈ 13/16" · 25mm ≈ 1" · 30mm ≈ 1-3/16" · 40mm ≈ 1-9/16" · 50mm ≈ 2" · 60mm ≈ 2-3/8"
Important: The listed length is the thread shank only and does not include the head height. Factor this in when measuring your assembly stack-up.
For M6 truss head screws, a 4mm hex key is typically required. For M8, a 5mm or 6mm hex key is generally correct. For M10, a 6mm or 8mm hex key is typically used. Always verify with the specific fastener before assembly, as head dimensions can vary slightly by manufacturer. Using the correct size prevents rounding of the socket and makes removal easier.
304 stainless steel provides good corrosion resistance and is generally suitable for indoor, humid, and light outdoor applications — including sheltered outdoor fixtures, equipment housings, and garage environments. For prolonged saltwater exposure, chlorine, or highly acidic conditions, 316 stainless steel is typically the better choice. These screws are not recommended for direct marine immersion.
These screws use ISO metric coarse thread — the most common metric standard worldwide. Pitches are M6 = 1.0mm, M8 = 1.25mm, M10 = 1.5mm. They are compatible with standard metric hex nuts, nylon lock nuts, flat washers, and tapped holes machined to ISO tolerances. They are not compatible with fine-thread (MF) tapped holes of the same nominal diameter.
304 stainless steel machine screws typically have a tensile strength of approximately 500–700 MPa (roughly 70,000–100,000 psi). The truss head design distributes clamping load over a wider bearing area than a standard pan head, which generally reduces surface indentation on softer materials. These screws are well-suited for light-to-medium load applications. For high-vibration or heavy structural loads, consider using thread-locking compound (e.g., Loctite 243) and verify load requirements against the screw's rated capacity.
The truss head (also called dome head or mushroom head) has a wider, lower-profile dome compared to a pan head, giving it a larger bearing surface without the height of a hex cap screw. This makes it ideal when you need load distribution across soft or thin materials, a finished dome appearance on visible surfaces, and the torque advantage of an Allen key drive — all in a single fastener. Button heads are similar but typically have a smaller bearing diameter; truss heads generally offer more surface contact.
Yes. These screws use standard ISO metric coarse thread and are compatible with any metric hex nut, nylon lock nut, or flat washer of the corresponding size (M6, M8, or M10). The truss head's wide bearing surface often eliminates the need for a washer on the head side, though a washer on the nut side is still recommended for soft materials to prevent the nut from embedding into the surface.
