| Size(mm) | Size(inch) | Size(mm) | Size(inch) | Size(mm) | Size(inch) | Size(mm) | Size(inch) |
| 3.5*13 | #6*1/2 | 3.5*65 | #6*2-1/2 | 4.2*13 | #8*1/2 | 4.2*100 | #8*4 |
| 3.5*16 | #6*5/8 | 3.5*75 | #6*3 | 4.2*16 | #8*5/8 | 4.8*50 | #10*2 |
| 3.5*19 | #6*3/4 | 3.9*20 | #7*3/4 | 4.2*19 | #8*3/4 | 4.8*65 | #10*2-1/2 |
| 3.5*25 | #6*1 | 3.9*25 | #7*1 | 4.2*25 | #8*1 | 4.8*70 | #10*2-3/4 |
| 3.5*30 | #6*1-1/8 | 3.9*30 | #7*1-1/8 | 4.2*32 | #8*1-1/4 | 4.8*75 | #10*3 |
| 3.5*32 | #6*1-1/4 | 3.9*32 | #7*1-1/4 | 4.2*35 | #8*1-1/2 | 4.8*90 | #10*3-1/2 |
| 3.5*35 | #6*1-3/8 | 3.9*35 | #7*1-1/2 | 4.2*38 | #8*1-5/8 | 4.8*100 | #10*4 |
| 3.5*38 | #6*1-1/2 | 3.9*38 | #7*1-5/8 | #8*1-3/4 | #8*1-5/8 | 4.8*115 | #10*4-1/2 |
| 3.5*41 | #6*1-5/8 | 3.9*40 | #7*1-3/4 | 4.2*51 | #8*2 | 4.8*120 | #10*4-3/4 |
| 3.5*45 | #6*1-3/4 | 3.9*45 | #7*1-7/8 | 4.2*65 | #8*2-1/2 | 4.8*125 | #10*5 |
| 3.5*51 | #6*2 | 3.9*51 | #7*2 | 4.2*70 | #8*2-3/4 | 4.8*127 | #10*5-1/8 |
| 3.5*55 | #6*2-1/8 | 3.9*55 | #7*2-1/8 | 4.2*75 | #8*3 | 4.8*150 | #10*6 |
| 3.5*57 | #6*2-1/4 | 3.9*65 | #7*2-1/2 | 4.2*90 | #8*3-1/2 | 4.8*152 | #10*6-1/8 |
Product Overview
The #6-#10 Coarse Thread Gray Drywall Screws for Gypsum are precision-engineered fasteners designed to streamline drywall installation in residential, commercial, and industrial construction. Crafted from high-quality carbon steel and finished with a gray phosphate coating, these screws balance corrosion resistance, holding power, and ease of use—making them a staple for contractors and DIY enthusiasts alike.
Compliant with ASTM C1002 (the standard for gypsum board fasteners), they are optimized for securing gypsum boards, plasterboard, and drywall to wooden or metal studs. Their coarse thread design and sharp point set them apart, ensuring quick penetration and secure grip in soft materials.
Product Specifications
Parameter | Value |
Material | Carbon steel (tensile strength: 550 MPa) |
Surface Treatment | Gray phosphate (salt spray test: 24 hours without white rust) |
Thread Type | Coarse thread (#6–#10) |
Screw Length | 16–50 mm (standard) |
Point Type | Sharp point (self-drilling) |
Certifications | CE, ASTM C1002, ISO 3506-1 (corrosion resistance) |
Features
Corrosion-Resistant Design:
The gray phosphate finish acts as a barrier against moisture and rust, making these screws suitable for humid environments like basements, bathrooms, and kitchens. The phosphate coating also reduces friction during installation, preventing thread galling and extending tool life. While designed for indoor use, they withstand 24 hours of salt spray testing without white rust—enough to resist corrosion from occasional water exposure or humidity.
High Holding Power:
Coarse threads with a larger pitch dig deeply into gypsum and wood, creating a mechanical lock that resists loosening over time. This design provides 30% greater pull-out resistance compared to fine-thread screws in soft materials, ensuring drywall remains securely fastened even as buildings settle. The threads are rolled (not cut), strengthening the steel and reducing the risk of stripping during installation.
Easy Installation:
The sharp, self-drilling point eliminates the need for pre-drilling, allowing contractors to drive screws directly into gypsum boards and studs with power drills or screwdrivers. This saves up to 20% of installation time compared to traditional fasteners. The gray color blends seamlessly with drywall, minimizing the need for putty or paint touch-ups—streamlining the finishing process.
Versatile Compatibility:
Available in sizes #6 to #10 and lengths 16–50 mm, these screws accommodate various gypsum board thicknesses (from 12.7 mm to 25.4 mm) and stud materials (wood or light-gauge metal). For metal studs, their sharp point penetrates thin steel without pre-drilling, while in wooden studs, the coarse threads ensure a tight grip. This versatility makes them a one-stop solution for most drywall projects.
Safety-Compliant:
ASTM C1002 certification ensures they meet strict standards for shear strength and pull-out resistance, critical for fire safety and structural integrity. The 2.5:1 safety factor guarantees they won’t fail under normal loads, preventing drywall sagging or detachment. The phosphate coating is non-toxic and meets VOC standards, making them suitable for residential environments.
Applications
Drywall Installation: Residential homes use these screws to attach gypsum boards to wooden studs, creating smooth walls and ceilings. Commercial buildings employ them for partition walls, withstanding heavy use in offices, hospitals, and schools.
Ceiling Tiles: Acoustic ceiling tiles in auditoriums and offices are secured with these screws, ensuring noise reduction and fire resistance. Suspended ceiling grids use them to attach to metal frames, maintaining alignment over time.
Renovation Projects: Home renovations rely on them to repair damaged drywall, with the gray finish blending into existing surfaces. Historic building restorations use them for sensitive drywall work, avoiding damage to original structures.
Furniture Manufacturing: Particleboard cabinets and bookshelves are assembled with these screws, providing strong, hidden connections. Wardrobes and closet systems use them to attach backing panels, ensuring stability.
Industrial Use: Cleanrooms in pharmaceutical facilities use them to secure gypsum-based insulation panels, withstanding frequent cleaning. Factories employ them for lightweight partition walls, separating work zones efficiently.
English 
