From my workshop to your project, I deliver the 4 inch flat head screw self tapping phillips that keeps assemblies tight and clean. As a {China} {Manufacturer}, I design these fasteners for rapid installation in metal, wood, and plastic panels. The 4 inch length provides deep bite for reinforced joints, while the flat head seats flush for a neat finish. The self tapping thread creates its own hole, saving time on installation and reducing pre-drilling costs. The Phillips drive resists cam-out and is easy to automate on production lines. Made from durable steel with zinc plating, these screws resist corrosion in typical indoor and outdoor environments. I offer consistent head tolerances, strong shear strength, and bulk pricing for B2B purchasers. If you need a steady supply, I can customize coatings, head countersink, or thread pitches to fit your equipment. Let me know your batch size and we’ll quote promptly; I’m ready to partner for large orders.
Choosing a reliable supplier for 4 inch flat head self-tapping Phillips screws means balancing quality and process discipline. These fasteners require a strong core, precise thread form, and a flush, corrosion‑resistant finish. Look for makers that guarantee tight tolerances, consistent hardening, and controlled drive recess depth to prevent cam-out. Materials include carbon steel with zinc or black oxide coatings, stainless steel, or plated variants; ask for material certificates. A capable facility offers inline checks, 100% inspections, and batch traceability. Beyond parts, a dependable supplier offers procurement stability. Seek scalable production, clear MOQs, reliable lead times, and robust packaging. Ensure RoHS/REACH compliance and finishing standards, with third‑party test reports if needed. A strong partner communicates proactively, provides samples quickly, and offers after‑sales service. For global buyers, a supplier balancing competitive pricing with consistent quality on large orders stands out.
| Variation | Length (in) | Diameter (in) | Drive Type | Head Style | Material | Finish/Coating | Thread Type | Standards/Compliance | Tensile Strength (MPa) | Typical Use |
|---|---|---|---|---|---|---|---|---|---|---|
| General Purpose #8 | 4 | 0.164 | Phillips | Flat Countersunk | Carbon Steel | Zinc Plated | Self-tapping (Coarse) | Industry Standard | 540 MPa | Sheet metal and light metal assemblies |
| General Purpose #10 | 4 | 0.190 | Phillips | Flat Countersunk | Carbon Steel | Zinc Plated | Self-tapping (Coarse) | Industry Standard | 550 MPa | Metal sheet fastenings, enclosures |
| Stainless A2 (304) | 4 | 0.190 | Phillips | Flat Countersunk | A2 Stainless (304) | Passivated | Self-tapping (Coarse) | General Stainless Standard | 520-700 MPa | Corrosive environments, indoors |
| Stainless A4 (316) | 4 | 0.190 | Phillips | Flat Countersunk | A4 Stainless (316) | Passivated | Self-tapping (Coarse) | Marine/Industrial Stainless | 550-800 MPa | Marine, coastal, and chemical exposure areas |
| Black Oxide Carbon Steel | 4 | 0.164 | Phillips | Flat Countersunk | Carbon Steel | Black Oxide | Self-tapping (Coarse) | Industrial Standard | 480-560 MPa | Automotive assemblies, general purpose mounting |