Hobson data sheet
NW21 Solar Screw Kit for Timber Roofs, 304 Stainless: Sizes and Capacity Data Sheet
Two-page product data sheet for the NW21 solar screw kit (part prefix MTFENW21), a 304 stainless hanger screw for mounting solar panels on timber framed roofs. It covers what comes in the kit, sizes and part numbers, pilot hole sizes for timber, and characteristic capacities.
What this covers
- Applications and features
- Kit contents
- Sizes and part numbers
- Pilot hole sizes in timber
- Characteristic capacities
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 timber framed roofs, through most types of roof cladding. A pre-drilled hole is needed.
- Supplied assembled: a black EPDM based TPV sealing washer and three 304 stainless hex flange nuts with locking serrations (ISO 4161 / DIN 6923). M8 kits also have a flat washer.
- Ten sizes: M8 x 150 and 200, M10 x 160 to 250, M12 x 200 to 400 (parts MTFENW2108150 to MTFENW2112400). All need a 14mm hole in the cladding.
- Suggested pilot hole in timber: M8 4mm softwood, 6mm hardwood. M10 5mm and 7.5mm. M12 6mm and 9mm.
- The capacity table gives characteristic tensile, shear, torsional and yield capacities by size (for example M10, 160mm and longer: 41.72kN tensile, 25.87kN shear). 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 timber roof framing.
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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.