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Finding the right combination of head profile, drive type, and material for a visible or corrosion-sensitive assembly is harder than it sounds. Standard pan head screws leave marks on soft materials, button heads can strip under torque, and zinc-plated hardware rusts within a season outdoors. DIYers, fabricators, furniture makers, and light industrial assemblers who need a low-profile head with a broad clamping footprint and long-term corrosion resistance often end up searching through multiple suppliers to find A2 stainless truss head socket cap screws in the exact size they need.
Each pack contains A2 stainless steel (304 grade) truss head socket cap screws in your selected size and quantity (5, 10, or 20 pieces). Diameters range from M3 to M10, with lengths from 4mm (≈5/32") to 60mm (≈2-3/8"), covering a wide range of panel thicknesses and engagement depths. The truss head profile features a wider, lower dome than a standard button head, providing a larger bearing surface that distributes clamping load and reduces pull-through risk in softer substrates. Drive is hex socket (Allen / hex key), allowing high torque application with a standard hex wrench or bit.
These A2 stainless truss head socket screws are well suited for outdoor furniture assembly and garden structure fastening, electronics enclosure and panel mounting where a flush-looking low-profile head is needed, woodworking and cabinetry hardware installation in visible locations, and light fabrication work where corrosion resistance and a clean aesthetic matter. The hex socket drive is also a practical choice for tight spaces where a screwdriver cannot reach but a hex key or ball-end driver can.
| Drive Type | Hex Socket (Allen / Hex Key) |
|---|---|
| Head Style | Truss Head (wide low-profile dome) |
| Material | A2 Stainless Steel (304 grade) |
| Finish | Natural stainless (uncoated) |
| Property Class | Typically 70 (approx. 700 MPa tensile strength) |
| Thread Standard | ISO Metric Coarse (M3, M4, M5, M6, M8, M10) |
| Available Diameters | M3, M4, M5, M6, M8, M10 |
| Available Lengths | 4mm (≈5/32") to 60mm (≈2-3/8") — see variant options |
| Pack Quantities | 5 Pcs / 10 Pcs / 20 Pcs |
| Magnetic Properties | Generally low magnetic permeability (non-magnetic in annealed state) |
| Corrosion Resistance | Good — suitable for indoor and most outdoor environments |
| Recommended Hex Key | See variant; typically 2mm (M3) to 8mm (M10) |
| Country of Origin | Contact us to confirm |
A general rule is to select a length that provides at least 1.5× the screw diameter of thread engagement in the base material. For example, an M5 screw fastening a 5mm panel into aluminum would typically need at least 7.5mm of thread engagement, so a total length of around 12–16mm is generally appropriate. Available lengths range from 4mm (≈5/32") to 60mm (≈2-3/8"). Measure your panel thickness and add the required engagement depth before selecting your size.
These screws are made from A2 stainless steel (equivalent to 304 stainless steel), a chromium-nickel alloy that provides good corrosion resistance in most indoor and mild outdoor environments. A2 stainless is generally non-magnetic in its annealed state and is one of the most widely used stainless grades for general fastener applications. Contact us to confirm the specific grade if needed for engineering documentation.
A2 stainless steel offers good corrosion resistance for most outdoor environments and will not rust under normal conditions. However, in marine or coastal environments with prolonged salt spray exposure, A4 (316) stainless steel is generally recommended for better chloride resistance. For standard outdoor DIY, garden, and construction applications, A2 is typically sufficient.
These are ISO metric machine screws with standard coarse metric threads (M3, M4, M5, M6, M8, M10). They are compatible with standard metric nuts, threaded inserts, and tapped holes machined to ISO tolerances. They are not compatible with UNC/UNF inch-standard threads.
A truss head screw has a wider, lower-profile dome-shaped head compared to a standard button head or pan head. The larger bearing surface distributes clamping load over a wider area, reducing the risk of pull-through in softer materials like wood, plastic, or thin sheet metal. It is commonly used in applications where a low-profile head with a broad footprint is needed without countersinking.
The required hex key size depends on the screw diameter. As a general reference: M3 typically uses a 2mm hex key, M4 uses 2.5mm, M5 uses 3mm, M6 uses 4mm, M8 uses 5mm or 6mm, and M10 uses 6mm or 8mm. Always verify with the specific fastener before installation, as truss head socket screws may use a shallower socket than standard socket cap screws.
A2 stainless steel screws are generally rated at property class 70 (approximately 700 MPa tensile strength), which is suitable for most general-purpose fastening applications. They are not as strong as high-tensile steel grades (such as 8.8 or 10.9) and are not recommended for high-load structural applications without engineering review. For light to medium-duty fastening in corrosion-resistant applications, A2 stainless is generally appropriate.
