Hobson performance data
12-14 x 25 Bi-Metal 304 Aluminium Seal Hex Roofing Screw (R10): Performance Data
Hobson's two-page DRiLLX performance data sheet for its 12-14 x 25mm bi-metal 304 stainless self-drilling screw with an aluminium seal hex head and sealing washer, part T4XMXAH1214025. It gives pull-out values in purlin, drill test and strength results, and installation.
What this covers
- Applications
- Pull-out values
- Drill point test
- Mechanical properties
- Dimensions
- Installation
Key things to remember
The essentials from this document in plain words. Check the full document before you rely on a figure.
- Metal to metal fixing for corrosive conditions: valley fixing of roof sheet, sheds and pergolas.
- Large 18mm sealing washer to support additional wind uplift loads.
- Bi-metal 304 stainless with Hobson's R1000 hours protective coating. 12 gauge x 14 TPI x 25mm, 5/16 inch hex drive, packs of 500 (QFind QB06).
- Working pull-out load in purlin: 450N in 1.2mm G2, 1,000N in 1.5mm G550, 1,400N in 2.0mm G450 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.
- 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: Roofers and shed or pergola builders valley fixing sheet in corrosive conditions.
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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.