Fishtailed Frame Cramps – Heavy Duty – Galvanised – Box 25

Galvanised fishtailed frame cramps are one of those fixings that have been doing the same job for decades, and for good reason. They work. Used primarily for securing timber door and window frames into blockwork and brickwork, these heavy duty cramps give a solid mechanical connection between the timber frame and the surrounding masonry. The fishtailed end beds into the mortar joint and locks in place as the wall is built or pointed around it, resisting any movement in the frame once the mortar cures.

Each cramp is galvanised after manufacture rather than before, which makes a real difference to the coating quality at cut edges and folded sections. The zinc coverage wraps the finished shape, not the raw steel blanks, so you get proper protection where it counts. Out on site in exposed conditions or in cavity work where moisture can sit, that distinction matters.

Where Galvanised Fishtailed Frame Cramps Get Used

These are not a single-trick fixing. Beyond the standard window and door frame application, they are regularly used to restrain masonry back to new or existing structures in non-structural situations, keeping leaf separation under control without any complicated engineering. They can also be shot-fired directly into steelwork, which makes them useful on mixed-structure builds where you have got a steel frame behind a masonry skin.

Hole Sizes and Fixing Options

Each cramp has two 6mm holes and one 8mm hole, giving you options depending on what you are fixing through into. The 8mm hole handles a coach bolt or larger screw without drama, while the 6mm holes take standard woodscrews or masonry fixings neatly. Simple enough, but it is the kind of detail that saves you drilling out holes on site because the fixings do not fit.

Available in 150mm, 200mm and 250mm lengths to suit different frame depths and reveal situations. Sold in boxes of 25, so there is enough in a box to get a job done without leftover fixings rattling around the van for six months.