Double-ended studs and hanger bolts
in category: Double-ended studs and hanger bolts
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Threaded rods and double-ended studs for PV roof mounting
The Threaded rods, double-ended studs category covers dual-thread bolts in A2 stainless steel for fixing photovoltaic mounting structures to roofs. One end screws into timber or steel. The other has a metric thread for adapters and triangles. It also lists sets with an adapter, and a separate adapter. It is intended for PV installers and roofers.
What you will find in this category
- Double-ended studs for timber rafters: M10x200, M10x250 and M10x300 mm, plus M12x250 and M12x300 mm, with a wood thread and a metric thread.
- Double-thread bolts for steel substructures: EJOT JT3-SB-3x155 in M10x50 (185 mm total) and M10x70 (225 mm total).
- Sets with adapter: M10 screws of 200, 250 or 300 mm with an 80x30x4 mm adapter, 10.5 mm hole, flange nuts and EPDM washer.
- Flat mounting adapter: stainless steel 1.4016 (H17), 80x30x4 mm, M10 thread.
How to choose
- Substructure: choose a wood-thread stud for timber rafters. For steel substructures, use the EJOT JT3-SB-3x155 with its self-tapping end.
- Thread size: M10 is the most common option. M12 is available in 250 and 300 mm.
- Length: studs for timber come in 200, 250 and 300 mm. Pick the length to suit the roof build-up and the adapter.
- Material: studs are A2 stainless steel 1.4301 (AISI 304). The adapters are stainless steel 1.4016 (H17).
- Stud or set: buy a set if you need the 80x30x4 mm adapter with the screw. Otherwise, choose the stud on its own.
Typical applications
These products are used to fasten PV structures to pitched roofs covered with metal sheet, shingle or roofing felt. The wood end goes into the rafter, and the M10 or M12 end carries the adapter or triangle. Sets with an adapter are also listed for flat roofs with timber structures. The EPDM washer seals the point where the stud passes through the roof covering.
Frequently asked questions
What is a double-ended stud used for in PV mounting?
One end is driven into the roof structure. The metric end fixes a roof adapter or triangle using flange nuts. This avoids separate fixings for each connection.
Are the nuts and seal included?
The product descriptions state that the studs come with flange nuts and an EPDM washer. The EPDM washer seals the point where the stud passes through the roof covering.
Which stud suits a steel substructure?
The EJOT JT3-SB-3x155 double-thread bolts, in M10x50 and M10x70. Their self-tapping end screws directly into the steel roof structure.
Not sure which stud, length or adapter set fits your roof? Contact our technical support and we will help you choose.