Hobson performance data
8-18 x 32 Bi-Metal Wings Countersunk Self-Drilling Screw: Performance Data
Hobson's two-page DRiLLX performance data sheet for its 8-18 x 32mm bi-metal 304 stainless countersunk self-drilling screw with wings, part T4XGXRQ0818032. It covers timber to metal fixing, pull-out values in purlin, strength results and installation.
What this covers
- Applications
- Pull-out values
- Drill point test
- Mechanical properties
- Technical note
- Installation
Key things to remember
The essentials from this document in plain words. Check the full document before you rely on a figure.
- Timber to metal fixing: fences, chipboard, composite panels and timber floors. Suits corrosive conditions.
- The wings ream a clearance hole in the timber and break off once the screw starts drilling the metal. Six ribs under the head let it sink into the timber.
- Bi-metal 304 stainless with R1000 hours protective coating. 8 gauge x 18 TPI x 32mm, square #2 drive, packs of 500 (QFind QB17).
- Working pull-out load in purlin: 300N in 0.5mm G2, 1,100N in 1.5mm G550 and 1,850N in 2.5mm G450.
- All pull-out figures are from laboratory tests on Hobson's DRiLLX screws; the working loads already include a factor of safety of 2.5 for steel.
- Wing screws are not recommended for fixing long lengths of timber directly to steel: the screw may break from movement between metal and timber caused by thermal expansion, humidity, building movement or overdriving.
- Install with a cordless screwdriver at 2,200 to 3,000 RPM, keep firm, steady pressure while it drills, and do not overtighten. Impact drivers are not recommended.
Who it helps: Builders fixing timber, chipboard or composite panels 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.