They are made of semi steel and combined with the plain bearing semi steel wheel, are well suited for high temperature applications. Construction: Cast semi-steel top plate, cup and legs provide excellent resistance to impact and abuse. King Pin: Rivet type with large steel washer for strength. Axle: For roller bearing wheels, bolt and cotter pin is used. Lubrication: Pressure fittings for swivel and straight roller bearing wheels.
Swivel Bearings: Hardened and polished steel balls fit into an exceptionally large diameter single ball race placed to adequately carry the load and absorb side shocks. Plate dimensions 5-3/4" x 3-5/8". Bolt hole spacing 4-7/16" x 2". Plate dimensions 5-7/8" x 4-1/4". Bolt hole spacing 3" x 4-9/16". I post feedback in bulk only a few times a month. I carefully package and secure items when packaging them.Do not ask me to put lower declared values on forms. We do not mark items as'gifts'. Powered by SixBit's eCommerce Solution.