Hobson performance data
8g Countersunk Rib Head Metal Tek Screw 8-18, Zinc Yellow: Performance Data
Hobson's two-page DRiLLX performance data sheet for the 8 gauge, 18 TPI countersunk rib head metal self-drilling screw in zinc yellow passivate (part T9PMYRP0818). It covers applications, pull-out values, the drill point test, mechanical properties, sizes and installation.
What this covers
- Applications
- 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 fixing timber to metal, fibre cement cladding, and temporary timber fencing and gates. 8 ribs under the head help it countersink.
- C1022 hardened steel, zinc yellow passivate finish, Phillips #2 drive. Lengths 20mm (T9PMYRP0818020) and 30mm (T9PMYRP0818030), packs of 1,000.
- 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.
- Pre-drill the timber first: a 2.5mm pilot hole in softwood, 3.0mm in hardwood. Then drive at 2,200 to 3,000 RPM with firm pressure, do not over-tighten, and do not use an impact driver.
Who it helps: Builders fixing timber or fibre cement sheet to light 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.