Drywall screws feature specialized geometries optimized for low-splitting penetration. The two primary variants are Bugle Head Coarse Thread (for wood studs) and Bugle Head Fine Thread (featuring twin-lead threads for light metal studs).
Standard Dimensional Matrix
| Nominal Size (Gauge) | Major Diameter Range (mm) | Minor Core Diameter (mm) | Head Diameter Range (mm) | Standard Pitch (Coarse) | Standard Pitch (Fine) | Recess Drive Size (Phillips) |
| #6 (3.5 mm) | 3.45 – 3.60 | 2.20 – 2.40 | 8.00 – 8.50 | 1.41 mm | 0.90 mm | No. 2 |
| #7 (3.9 mm) | 3.80 – 3.95 | 2.50 – 2.70 | 8.20 – 8.75 | 1.58 mm | 1.00 mm | No. 2 |
| #8 (4.2 mm) | 4.15 – 4.30 | 2.80 – 3.00 | 8.50 – 9.00 | 1.81 mm | 1.10 mm | No. 2 |