The Black Phosphate Carbon Steel Bugle Head Drywall Screw (commonly known as a wallboard screw, gypsum board screw, plasterboard screw, bugle head wood tapping screw, or ASTM C1002 / DIN 18182 fastener) is a specialized high-performance fastener designed specifically for attaching gypsum plasterboard sheets to wooden framing studs or light-gauge steel framing channels. Featuring a distinctive curved bugle head profile, the screw depresses the paper surface of the drywall sheet without tearing or breaking the outer paper layer, producing a neat, flush countersunk finish ready for joint compound filling. Manufactured from C1022A carbon steel wire rod and treated with a protective black phosphate coating, our drywall screws comply fully with global ISO standards.
Technical Specifications of Bugle Head Drywall Screws
We manufacture both coarse thread (for wood studs) and fine twinfast thread (for light metal studs) drywall screws. Case-hardening heat treatment provides an ultra-hard tip (≥ 550 HV) for fast penetration while maintaining a ductile core to prevent head snapping during high-speed power driving.
| Drywall Screw Type | Thread Profile | Target Substrate | Surface Hardness | Surface Coating Advantage |
|---|---|---|---|---|
| Coarse Thread Bugle Head Drywall Screw | Single Lead Pitch (Deep Flutes) | Timber Studs, Plywood, Softwood Framing | ≥ 550 HV0.3 | Black Phosphate (High paint & joint compound adhesion) |
| Fine Thread Bugle Head Drywall Screw | Twinfast Dual Lead Fine Pitch | Light Steel Studs (0.5mm – 1.0mm thickness) | ≥ 550 HV0.3 | Black Phosphate (Corrosion resistant & smooth driving) |
| Hi-Lo Thread Drywall Screw | Alternating High & Low Threads | Plastic Dowels, Hardwood & Thin Sheet Metal | ≥ 550 HV0.3 | Black / Grey Phosphate (Prevents wood splitting) |
Precision Cold Heading, Thread Rolling, and Chemical Phosphating Process
At our manufacturing plant in Handan, China, bugle head drywall screws are forged, threaded, heat-treated, and chemically coated on automated continuous production lines:
- Multi-Station Precision Cold Heading: High-speed cold formers punch C1022A carbon steel wire into smooth bugle heads with deep, clean Phillips No. 2 recesses that eliminate driver bit wobble.
- High-Speed Thread Rolling: Precision thread rolling machinery forms sharp gimlet points and sharp thread crests for instant piercing into wood or steel studs.
- Controlled Atmosphere Case Hardening: Continuous mesh-belt carburizing furnaces infuse carbon into the surface, creating a hard skin (≥550 HV) while preserving core flexibility (270–390 HV) to pass a 15-degree bend test without fracturing.
- Chemical Phosphating Treatment: Screws pass through multi-stage acid cleaning and zinc-manganese/iron phosphating baths, depositing a porous matte black conversion coating that key-locks joint plaster and paint.
Industrial Applications of Bugle Head Drywall Screws
Black phosphate bugle head drywall screws are widely specified across interior decoration, building construction, and woodworking projects:
- Gypsum Wallboard & Ceiling Installation: Securing plasterboard sheets to timber joists and light steel drywall channels in residential and commercial buildings.
- Woodworking, Cabinetry & Furniture Assembly: Fastening chipboard, MDF, plywood, and wooden framing components requiring high torque resistance.
- Acoustic & Insulation Panel Mounting: Attaching soundproofing boards, thermal insulation panels, and composite wallboards.
Quality Assurance and Export Packaging for Drywall Screws
Handan YiHao Fastener enforces strict Quality Assurance (QA) standards for all overseas export orders. Testing procedures include 100% Phillips recess bit gauge checks, 90-degree bending tests, driving speed tests into wood/metal studs (under 1.5 seconds), surface/core Vickers hardness testing, and salt spray validation.
All export items are bulk packed in heavy-duty 25kg inner cartons or 1000pcs small color boxes, neatly stacked on ISPM 15 compliant fumigated wooden pallets, and wrapped in protective stretch film for safe ocean freight.
Request Factory Direct Pricing for Bugle Head Drywall Screws
Looking for a trusted manufacturer in Handan, China for carbon steel C1022A black phosphate bugle head drywall screws (ASTM C1002, DIN 18182, Coarse & Fine Thread)? Contact Handan YiHao Fastener today for technical datasheets, driving speed test reports, free samples, and direct bulk export quotes.
