Forgefix high tensile bolts 88 grade steel zp forgefix 5htss1250 these forgefix set screws are made from grade 88 steel and are zinc plated for increased resistance to corrosion they are fully threaded and conform to din 933 standards can be used with many nut types and washers for fastening together numerous types of material or to be fastened in to pre tapped holes widely used in many engineering applications zinc coatings prevent oxidation of the protected metal to create a longer l