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Standard pan head screws can pull through thin sheet metal, soft panels, or lightweight assemblies under load — leaving you with a loose joint and a damaged workpiece. For builders, fabricators, and maintenance technicians who need a fastener that holds without pull-through, the truss head profile is the right choice.
These metric truss head Phillips machine screws are made from carbon steel (Grade 5 equivalent) with a zinc plating finish for moderate corrosion resistance. Available in M4, M5, and M6 thread sizes with shank lengths from 4mm to 50mm (approximately 0.16" to 1.97"). Pack sizes range from 5 to 1000 pieces to match any project scale.
Ideal for sheet metal assemblies, electrical enclosures, HVAC ductwork, automotive trim panels, furniture hardware, and general-purpose metric fastening where a wide, low-profile head is required to distribute clamping load and prevent pull-through.
| Thread Sizes | M4, M5, M6 (metric coarse thread) |
|---|---|
| Thread Pitch | M4: 0.7mm | M5: 0.8mm | M6: 1.0mm |
| Head Style | Truss Head (wide, low-profile dome) |
| Drive Style | Phillips (PH2 / #2 recommended) |
| Material | Carbon Steel, Grade 5 equivalent |
| Finish | Zinc Plated |
| Length Range (M4) | 4mm – 30mm (approx. 0.16" – 1.18") |
| Length Range (M5) | 6mm – 40mm (approx. 0.24" – 1.57") |
| Length Range (M6) | 8mm – 50mm (approx. 0.31" – 1.97") |
| Length Measurement | Shank only — head not included |
| System of Measurement | Metric |
| Pack Sizes Available | 5, 10, 20, 30, 50, 100, 200, 250, 300, 500, 1000 Pcs (varies by size) |
| Corrosion Resistance | Moderate — suitable for indoor and light sheltered outdoor use |
A truss head screw has a wider, lower-profile domed head compared to a pan head. The larger bearing surface distributes clamping load over a greater area, making it ideal for thin or soft materials where a standard pan head might pull through.
These screws are made from carbon steel (Grade 5 equivalent) with a zinc plating finish. Zinc plating provides moderate corrosion resistance suitable for indoor and light-duty outdoor applications.
For truss head screws, the listed length refers to the shank length only — the head is not included in the measurement. This is the standard convention for non-countersunk fasteners. Plan your hole depth accordingly.
These screws use a Phillips drive. For M4 and M5, a #2 Phillips bit is typically recommended. For M6, a #2 or #3 Phillips bit is generally appropriate. Always use a properly sized bit to avoid cam-out and head damage.
Standard metric coarse thread pitches: M4 = 0.7mm, M5 = 0.8mm, M6 = 1.0mm. These are compatible with standard metric nuts and threaded inserts of the same size.
Pack sizes vary by size and include options from 5 pieces up to 1000 pieces. Available quantities include 5, 10, 20, 30, 50, 100, 200, 250, 300, 500, and 1000 Pcs depending on the selected thread size and length.
Truss head screws are commonly used in sheet metal assemblies, electrical panels, HVAC ductwork, automotive trim, furniture hardware, and any application where a wide bearing surface is needed to prevent pull-through in thin or soft materials.
Zinc-plated carbon steel screws offer moderate corrosion resistance and are generally suitable for light outdoor or sheltered applications. For prolonged outdoor or high-humidity exposure, stainless steel fasteners are typically recommended.
