6.0 mm diameter cold forged self-drilling self-tapping screw fasteners, with a T25 Torx drive and buttress thread form. Designed to provide optimal performance in thin gauge metal or timber decking, and suitable for use with a range of pressure plates and washers.

A Silver SFSintec DUROCOAT coating provides corrosion in excess of the requirements of Clause 2, UEAtc directive 'Supplementary Guide for the Assessment of Mechanically Fastened Waterproof' and Factory Mutual FM 4470.


SBF-T25 fasteners should be installed with the appropriate installation tool, to avoid damage to the deck and to ensure correct setting.

General information

Uniclass 2015

Pr_20_29_76_76 Self-drilling screwsPrimary


J42/355 Mechanical fasteners, washers, pressure plates, etc.

J42/40 Laying warm deck roof insulation

Specification data - Self-drilling screws

Product Reference


Pressure plate/ Washer

DTL-70 x 70

Sarnabar 15/6

Peelstop 15/6

Bar end washer



Product Options

Pressure plate/ Washer:

  • DTL-70 x 70: 70 mm square galvanized steel washer with rounded corners for attaching thermal insulation. The washer's flat surface makes it ideal for attaching insulation boards beneath adhered membranes as it reduces the 'ghosting' associated with many insulation washers. Requires one fastener assembly per washer.
  • Sarnabar 15/6: 3 mm thick linear bar used to attach the Sarnafil membrane in Sarnabar systems. Roll formed from steel strips galvanized to EN 10142-FeP03GZ275N, Sarnabar 15/6 is pre-punched with 6 mm diameter and 15 mm holes, alternating at 25 mm centres to speed installation.
  • Peelstop 15/6: 1 mm thick linear bar, used at the perimeters and angle changes of adhered systems, to prevent membrane peel at vulnerable roof areas. 2.125 m x 30 mm Peelstop 15/6 is made from a roll formed and knurled steel strip galvanized to EN 10142-FeP03GZ275N. It is pre-punched with 6 mm diameter and 15 mm holes, alternating at 125 mm centres to speed installation.
  • Bar end washer: 90 mm diameter galvanized steel washer, for use at the end of intermediate perimeter rows of Sarnabar to prevent damage to the membrane.
  • SBT - 15 mm diameter grey polyamide SBT tube for use with 15/6 Sarnabars, Peelstops & SBIW insulation washers.
  • SFT - 15 mm diameter grey polyamide SFT tube with an integrated 50 mm diameter stress plate, with four large barbs which puncture and grip the membrane. For use in Sarnafast mechanically fastened membrane systems.

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