Forgefix carriage bolt amp nut zp in bags forgefix 10cb875 these forgefix carriage bolts are zinc plated and ideal for timber to timber joining they come complete with a hex nut and are fully threaded to 100mm also known as cup square hex bolts the square underneath the cup stops rotation of the bolt when tightening conform to din603 and din934 standards available in a comprehensive range of sizes to suit most applications used mainly for fastening timber to timber and is extensive