6.3 mm diameter cold forged self-tapping screw fasteners, with an internal T25 drive and buttress thread form. Designed to provide optimal performance in concrete, 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.


TI-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.

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:

  • SBIW-70 x 70: 70 mm square galvanised steel washer with rounded corners for attaching thermal insulation. Suitable for use with the SBT tube system only, the flat surface of the washer makes it ideal for attaching insulation board beneath adhered membranes, as they reduce the 'ghosting' associated with normal plastic headed tube fasteners used for insulation attachment. Requires one SBT 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 galvanised 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 galvanised to EN 10142-FeP03GZ275N. It is pre-punched with 6 mm diameter and 15 mm holes, alternating at 125 mm centres to speed installation.
  • SBT Row Termination Washer: 105 mm diameter galvanized steel washer, for use with the SBT tube system only. Positioned at the end of intermediate perimeter rows of Sarnabar or intermediate rows of SFT fasteners, the SBT Row Termination Washer is secured with three fasteners per washer and prevents 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.

Similar products from Sika Sarnafil