Hobson performance data
8g Button Wafer Head Metal Tek Screw 8-18, Class 3: Performance Data
Hobson's two-page DRiLLX performance data sheet for the 8 gauge, 18 TPI button wafer head metal self-drilling screw with a Class 3 finish (part T9PM3AP0818). It covers applications, pull-out values, the drill point test, mechanical properties, sizes and installation.
What this covers
- Applications
- Material and finish
- Pull-out values
- Drill point test
- Mechanical properties
- Sizes
- Installation
Key things to remember
The essentials from this document in plain words. Check the full document before you rely on a figure.
- For backpans, foil sarking, fascia brackets and conduit clips. The low button wafer head is 10mm across and 2.3mm high.
- C1022 hardened steel, Class 3 finish, Phillips #2 drive, packs of 1,000.
- Lengths 12, 16, 20, 25 and 32mm (T9PM3AP0818012 to T9PM3AP0818032).
- Pull-out working load: 300N in 0.7mm G2 plate, 1,250N in 1.5mm G550 and 2,200N in 2.5mm G450. The working loads already include factors of safety and come from laboratory tests.
- Drill point test: drills 1.5mm G450 plate in 3 seconds on average (4 seconds maximum) at 2,200 RPM under an 18kg load.
- Install with a cordless screwdriver set at 2,200 to 3,000 RPM, with firm, steady pressure while it drills. Do not over-tighten, and impact drivers are not recommended.
Who it helps: Roofers, electricians and builders fixing sarking, brackets and clips to steel.
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This document is published by Hobson Engineering, who supply this range to us. We show it here in full so you can read it next to the product; the summary above is ours. Read it on this page or download the PDF. For the most current version, ask us.