The Ref 70 is popular internationally for use in heavy-duty applications. When combined with the recommended companion oval washer, Ref 70 bolts offer the largest flat head available. This large head resists pull through the elevator belt, making the Ref 70 bolt ideal for attaching heavy steel or iron buckets, such as those used to move foundry sand. The Ref 70 bolt is employed on pulleys over 20 in. in diameter and is strongest when coupled with the oval washer, increasing the effective size of the bolt head and its holding power. Ref 70 bolt is available in zinc-plated steel, with 18 sizes ranging from ¼-20 x 1/2 in. to 3/8-16 x 2-1/2 in..

Tapco manufactures the Ref 70 to accompany their existing five styles: No. 1 Norway Flat Countersunk, No. 3 Eclipse (Slotted), Fanged, Pointed End Fanged and Western 3-Prong. All Tapco bolts are tested for tensile strength, torque, thread conformance and Rockwell hardness. All Tapco bolts exceed IFI specifications