Wallace Forge has been manufacturing quality King Pins for tractor trailers since 1980. All their King Pins are 100% American made and individually checked to insure the highest quality. Forged out of an AISI 8630 or 4320 material, depending on the model, Wallace Forge’s Kin Pins conform to all SAE and AAR standards. Every one of our King Pins is 100% Brinell hardness checked, magnetic particle inspected and weldable.