Hobson data sheet
RWA22 Solar Screw Kit for Steel Roofs, 304 Stainless: Sizes and Pull Out Data Sheet
Two-page product data sheet for the RWA22 solar screw kit (part prefix MTFERWA2208), a 304 stainless hanger screw with a self tapping thread for mounting solar panels on metal framed roofs. It covers what comes in the kit, sizes and part numbers, pre-drilled hole sizes, and characteristic pull out and shear resistance by steel thickness and grade.
What this covers
- Applications and features
- Kit contents
- Sizes and part numbers
- Pre-drilled hole sizes
- Characteristic pull out and shear
Key things to remember
The essentials from this document in plain words. Check the full document before you rely on a figure.
- For mounting solar panels and external roof brackets on steel battens or brackets, through most types of roof cladding. A pre-drilled hole is needed.
- Supplied assembled: a black EPDM based TPV sealing washer, a 304 stainless washer (ISO 7089 / DIN 125), two hex nuts (DIN 934) and two hex flange nuts with locking serrations (ISO 4161 / DIN 6923).
- Two sizes: M10 x 200 (MTFERWA2208200) and M10 x 250 (MTFERWA2208250), with an 8mm screw thread and a 14mm hole in the cladding. Packs of 25.
- Recommended pre-drilled hole: 6.8mm in steel 2 to 5mm thick, 7.0mm in 6mm steel, 7.2mm in 8 and 10mm steel. Maximum setting torque 18Nm.
- The table gives characteristic pull out and shear resistance for steel 2 to 10mm thick in grades S235, S275 and S355 (for example 3mm S355: 6.50kN pull out). These are characteristic values, meaning 95% of screws exceed them: they are for engineers, not working loads.
Who it helps: Solar installers and roofers fixing panel rails to steel battens or brackets.
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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.