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Dual-thread bolt M12×300 mm stainless steel A2 – PV mounting to rafters

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M12×300 mm dual-thread bolt made of A2 (1.4301) stainless steel. Weight 0.25 kg. Dual thread: the wood end is screwed into the rafter, the M12 metric end fits roof adapters with flange nuts and an EPDM washer. For fastening PV structures to wooden roof rafters.

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with VAT without VAT
Price €2.51
incl. 23% VAT

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Packaging options

pcs.
Availability:
In stock (large quantity)
Shipping time: 10 Business days

Product features

[PIM] Śruby dwugwintowe, dwugwinty #39

  • Product Type Double-Ended Stud
  • Thread type M12
  • Length [mm] 300

Description

Dual-thread bolt M12×300 mm stainless steel A2 – PV mounting to rafters

Dual-thread bolt M12×300 stainless steel A2 with flange nuts and EPDM washer
Dual-thread bolt M12×300 stainless steel A2 with flange nuts and EPDM washer

The M12×300 mm dual-thread bolt made of A2 (1.4301) stainless steel is a key component for fastening photovoltaic structures to wooden roof rafters. The complete set includes flange nuts and an EPDM washer, which seals the point of penetration through the roof covering — there is no need to order separate seals or washers. The dual-thread design features two different thread types: the wood-threaded end is screwed directly into the rafter, while the M12 metric end is used to secure roof adapters using the included flange nuts. The austenitic A2 stainless steel guarantees exceptional corrosion resistance thanks to the nickel content in the alloy, ensuring the bolt retains its full parameters in all weather conditions throughout the entire service life of the PV installation.

Application and compatibility

  • Installation of adapters and triangles for photovoltaic systems on pitched and flat roofs
  • Roof coverings: metal roof tiles, trapezoidal sheet, shingles, roofing felt
  • Threaded end screwed directly into the wooden roof structure — no expansion plugs required
  • The integrated flange washer with EPDM seal ensures tightness at the point of contact with the covering
  • Complete ready-to-install set — the bolt is sold with flange nuts and an EPDM washer
Installation diagram of dual-thread bolt with adapter on a pitched roof covered with metal roof tiles
Installation diagram of dual-thread bolt with adapter on a pitched roof covered with metal roof tiles
Installation diagram of PV rail on a pitched roof using a dual-thread bolt and adapter
Installation diagram of PV rail on a pitched roof using a dual-thread bolt and adapter

Technical parameters

Thread / nominal diameterM12
Length300 mm
Head type / shapedual-thread (double thread — wood + metric)
Weight0.25 kg

Material and coating

Materialstainless steel A2 (1.4301 / AISI 304)
Corrosion resistancehigh — austenitic stainless steel with nickel addition

Set contents

Applicationfastening PV adapters and triangles to a wooden roof structure
Compatible componentsroof adapters, flat roof triangles, flange nuts
Video presenting the dual-thread bolt and PV mounting system
Video presenting the installation of a photovoltaic structure on a roof
Video presenting components of the solar panel mounting system

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Number of ratings: 6
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