Hobson technical document
Self-Drilling Screw Guide: Point and Head Identification
The manufacturer technical guide to self-drilling screws. It explains every feature of the screw, how gauge and threads per inch are written, how length is measured for each head, how much embedment gives full pull out strength, the drill point types, coarse and fine threads, and the head, seal and drive styles. Read it on this page or download the PDF.
What this covers
- Screw features
- Size and type identification
- Measuring length
- Embedment
- Drill point types
- Thread types
- Head and seal styles
Applies to Chipboard Screw, Metal Tek Screw With XGRiP, Needle Point Screw, Plasterboard Screw, Type A Button Post Torx Screw, Roofing & Cladding Screws, S500 Insulated Panel Screw (XGRiP), Tek Screws (Self-Drilling Metal Screws), Stitching Screw, Type 17 Hex Screw With XGRiP, Type 17 Screws (Batten & Decking Screws), Type 17 Screw With XGRiP and 1 more.
Key things to remember
The essentials from this document in plain words. Check the full document before you rely on a figure.
- Gauge to thread diameter: 6g 3.5mm, 8g 4.2mm, 10g 4.8mm, 12g 5.5mm, 14g 6.3mm.
- Coarse thread (up to 16 TPI) for lighter steel and timber; fine thread (over 16 TPI) for steel from 2mm.
- Minimum timber embedment for full pull out: 25mm for #12, 35mm for #14. In steel, at least three threads through.
- Points: metal, Series 500 (thick steel), winged (timber to steel), Type 17 and needle.
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