Steelworks Allthread rods are ideal for use wherever, and whenever, tension loads are expected. Allthread oil rods come in 5/16-18 x 3' and 3/8-16 x 3' sizes. All threaded rods come in lengths 3ft. Coarse threadAllthread oilManufactured in accordance with ASTM A-307 specifications to a commercial nut fit36" length1/2" diameter13 threads per inch