Flat Head Self-Tapping Screw
Flat head self-tapping screws tap their own threads into sheet metal, plastic and thin castings. Phillips flat countersunk head provides flush finish. Hardened carbon steel or stainless steel options. Widely used in electrical, metalwork and general assembly.
Flat head self-tapping screws are versatile fasteners designed to form their own mating threads when driven into pre-drilled or thin sheet materials. The flat countersunk head sits flush with the workpiece surface after installation for a clean, unobtrusive finish. Suitable for metal sheet, plastic, thin castings and wood composites, they are widely adopted in machinery, electrical equipment, furniture and general assembly work.
Key Features
- Flat Countersunk Head: Fully sinks into the material to create a flush surface, no protruding head.
- Self-Tapping Thread: Forms threads inside the substrate during driving, eliminating pre-tapped holes.
- #2 Phillips Recess: Secure bit engagement, low cam-out, compatible with electric screwdrivers and impact drivers.
- Sharp Tapping Point: Quick penetration for thin sheets and plastics.
- Material: C1022 hardened carbon steel as standard; stainless steel SS304 / SS316 optional for corrosion resistance.
- Surface Finish: Blue white zinc plating, yellow zinc plating, black oxide available.
- Full Size Range: Metric M2.2, M2.9, M3.5, M4.2, M4.8, M5.5; lengths from 6.5mm to 50mm.
Applications
- Fastening thin metal sheets, galvanized steel, plastic profiles and thin castings
- Electrical cabinets, household appliances, metal frames, lighting fixtures
- General assembly, signage and sheet metal fabrication Note: Pre-drilling is recommended for thick or hard metal to avoid screw breakage.
Technical Specifications
| Item | Details |
|---|---|
| Product Name | Flat Head Self-Tapping Screw |
| Material | C1022A Hardened Carbon Steel; SS304 / SS316 optional |
| Head Type | Flat Countersunk Head |
| Drive | Phillips #2 |
| Thread | Self-Tapping Thread |
| Point | Sharp Tapping Point |
| Surface | Blue-white Zinc / Yellow Zinc / Black Oxide |
| Standards | GB, ISO, DIN, ANSI |
Installation Tips
- Match pilot hole diameter to screw size for optimal tapping performance.
- Avoid over-torque to prevent thread stripping or screw fracture.
- Outdoor or wet environments, select stainless steel version for anti-rust.
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