Cup square, non hex, hot dip galvanised, GR 4.8, STD, 12 x 1.75 x 25 mm, Fastbolt.

Cup square bolts are primarily used in construction. Being useful for connecting metal and wood, they are often used when securing corrugated sheets onto various structures such as houses, car ports, and patio roofs. The cup square bolt itself features a spiral shank for extra grip when it is screwed in. this makes for an effective combination with the seal, which is knocked into place to provide effective waterproofing. Hot-dip galvanizing, like other coatings, isolates the steel from the environment providing basic, barrier protection to ensure longevity.