Keszoox
Black Carbon Steel Phillips Truss Head Screws M3 M4 M5 M6 Cross Recessed Mushroom Head Self Tapping Screws
Black Carbon Steel Phillips Truss Head Screws M3 M4 M5 M6 Cross Recessed Mushroom Head Self Tapping Screws
Couldn't load pickup availability
Black Carbon Steel Phillips Truss Head Self-Tapping Screws — M3 / M4 / M5 / M6, Cross Recessed Mushroom Head
Black oxide-coated carbon steel Phillips (cross recessed) truss head self-tapping screws in M3, M4, M5, and M6 sizes. The truss head (also called mushroom head) profile provides a wide, low-profile bearing surface that distributes clamping force over a larger area than a standard pan head, reducing the risk of pull-through in thin sheet metal, plastic panels, and PCB mounting applications. The black oxide finish provides corrosion resistance and a clean aesthetic for visible fastener applications in electronics enclosures and PC builds.
Technical Specifications
| Parameter | Value |
|---|---|
| Material | Carbon steel (medium carbon, heat treated) |
| Finish | Black oxide (blackened), corrosion resistant |
| Head Type | Truss head (mushroom head) — wide, low-profile |
| Drive Type | Phillips (cross recessed, PH2 driver) |
| Thread Type | Self-tapping (coarse thread, Type AB) |
| Sizes Available | M3, M4, M5, M6 |
| Pack Quantities | 10pcs / 25pcs / 50pcs |
| Hardness | Case hardened (self-tapping into steel, aluminium, plastic) |
| Certification | RoHS |
Size Selection Guide
| Size | Typical Use | Pilot Hole (Steel) | Pilot Hole (Plastic) |
|---|---|---|---|
| M3 | PCB standoffs, small electronics panels, fan grilles | 2.5mm | 2.6mm |
| M4 | PC case panels, aluminium extrusion, sheet metal | 3.3mm | 3.5mm |
| M5 | Heavier sheet metal, enclosure lids, structural panels | 4.2mm | 4.4mm |
| M6 | Heavy-duty enclosures, rack mount panels, motor mounts | 5.0mm | 5.2mm |
Typical Applications
- PC Case Assembly: M3 and M4 truss head screws for securing side panels, drive bays, and fan brackets in ATX, mATX, and ITX PC cases
- Electronics Enclosures: Fastening plastic and aluminium enclosure lids, front panels, and PCB mounting plates
- Sheet Metal Fabrication: Self-tapping into thin steel and aluminium sheet (0.8–2.0mm) without pre-tapping
- 3D Printed Parts: Self-tapping into PLA, PETG, and ABS printed parts for secure, reusable fastening
- Rack Mount Equipment: M6 truss head screws for 19-inch rack panel and equipment mounting
- Automotive Interior Trim: Securing plastic trim panels and interior components in automotive applications
FAQ
Q: What driver bit size do these screws require?
A: M3–M4 use a PH1 or PH2 Phillips bit; M5–M6 use a PH2 or PH3 bit. A PH2 bit fits all sizes in this range for general use.
Q: Are these screws suitable for stainless steel sheet?
A: Carbon steel self-tapping screws can tap into thin stainless steel (up to ~1.5mm), but for thicker stainless or high-torque applications, use stainless steel self-tapping screws to avoid galling and bit cam-out.
Q: What is the difference between truss head and pan head?
A: A truss head has a wider, lower-profile dome compared to a pan head. The larger bearing surface reduces pull-through force in thin materials and provides a flatter appearance when installed.
Package Contents
- 10 / 25 / 50 × Black carbon steel Phillips truss head self-tapping screws (size and quantity as selected)
