Wafer Head (Modified Truss)
Direct Answer
Wafer Head screws (Modified Truss / K-Lath / Framing Screws) feature an ultra-flat, razor-thin head with an integrated wide circular clamping rim and a flat underside. Engineered with a self-drilling TEK point or sharp piercing tip, they are standard in light-gauge steel stud framing, metal lath attachment, and drywall partition construction.
Source: ASTM C1002 / ASTM C954 / DIN 7504
Specs
| Standard Specifications | ASTM C1002 (Steel studs) / ASTM C954 / DIN 7504-M |
| Head Thickness | Ultra-thin low profile (~1.0 mm to 1.5 mm thick) |
| Head Outer Diameter | Wide circular flange (10.0 mm to 11.5 mm on #8 screws) |
| Point Types | Self-Drilling TEK Point (#2/#3 drill point) or Sharp Piercing Point (Type S) |
| Common Drive Recess | Phillips #2 / Square #2 |
| Primary Applications | Steel stud framing, stucco metal lath, HVAC ductwork, M.2 SSD hold-down screws |
Drywall and Framing Flush Clearance
When drywall or gypsum board is installed over steel framing studs, standard screw heads create unsightly surface bumps. Wafer head screws press virtually flat against the steel stud flange, allowing subsequent sheets of drywall to lie perfectly flat without teetering.
Electronics Wafer Head Usage
Micro-machined wafer head screws (M2×3mm) are standard for M.2 SSD hold-down screws on PC motherboards, where the ultra-thin flange securely clamps the edge of the printed circuit board without colliding with adjacent surface-mount NAND flash chips.