Black Phosphate Drywall Screw
Material: Carbon steel
Head Style: Bugle Head
Driver types: Philips drive/Customised
Shank Size: #6, #8 /Customised
Thread types: Coarse (wood), Fine (metal)
Length: 1-1/4″, 1-5/8″, 2″/Customised
Coating: Grey/Black phosphate, Zinc-Plated, Ruspert, etc.
Package: Carton box (1000pcs/ carton) – Pallet /Customized
Frequently Asked Questions About Black Phosphate Drywall Screw
Q1: Is the black phosphate coating rust-proof?
A: Black phosphate coating provides a moderate level of corrosion resistance and excellent lubricity for driving, but it is not fully rust-proof. This finish is primarily designed for interior drywall installation, where moisture exposure is minimal. For outdoor applications, high-humidity areas (e.g., bathrooms without ventilation), or exterior cladding, we strongly recommend our zinc-plated or stainless steel alternatives.
Q2: What’s the difference between drywall screws, wood screws, and self-drilling screws?
A: While they may look similar, they serve different purposes:
| Feature | Drywall Screws | Wood Screws | Self-Drilling Screws |
|---|---|---|---|
| Thread Design | Fine-thread (for steel studs) or coarse-thread (for timber) | Coarse, deep threads for wood grip | Variable threads with a drill point |
| Head Shape | Bugle head (countersinks smoothly without tearing paper) | Flat/round head with under-head bearing | Hex/pan head with washer |
| Point | Sharp needle point (self-tapping) | Sharp tapered point | Drill-point (no pre-drilling needed) |
| Primary Use | Plasterboard to studs | Solid wood joinery | Metal-to-metal or metal-to-wood |
We do not recommend using drywall screws for structural wood framing or heavy load-bearing applications, as they have lower shear strength than dedicated structural screws. For best results, always match the screw to the specific substrate and load requirement.
Q3: How many pieces are there per box?
A: Our standard packing is 1kg per box (quantity varies by size – approx. 900–1,200 pcs for 25mm–35mm lengths). We also offer bulk packages for large-scale contractors and small blister packs for DIY/hardware store channels.
Beyond standard weight-based packing, we provide custom piece-count packing (e.g., 1,000 pcs/box exactly) and private-label box printing with your brand logo. Please let us know your target market and preferred packing format, and we will tailor a solution for you.
