Hobson performance data
14-14 Bi-Metal 304 Aluminium Seal Hex Roofing Screw (R10): Performance Data
Hobson's two-page DRiLLX performance data sheet for its 14-14 bi-metal 304 stainless self-drilling screw with an aluminium seal hex head and sealing washer, in five lengths (T4XMXAH1414025 to T4XMXAH1414095). It covers pull-out values, drill test and strength results, and installation.
What this covers
- Applications
- Pull-out values
- Drill point test
- Mechanical properties
- Sizes and part numbers
- 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: crest fixing roof sheet (valley fixing with the short screws), sheds and pergolas.
- Large 18mm sealing washer to support additional wind uplift loads.
- Bi-metal 304 stainless with Hobson's R1000 hours protective coating, 3/8 inch hex drive.
- Five lengths: 25 and 35mm in packs of 500, 52, 70 and 95mm in packs of 250.
- Working pull-out load: 350N in 0.8mm G2 purlin, 1,300N in 1.5mm G550, 2,650N in 2.5mm G450 and 5,250N in 5.0mm hot rolled steel.
- 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 crest or valley fixing sheet onto steel purlins 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.