Square Head Machine Bolts are manufactured by cold heading or hot forging using a wide variety of materials including Gr. 2, 5, 8, Stainless Steel and Brass with different finishes including Hot Dip Galvanized, Zinc Plating and many more.

Available in sizes from 1/4"-2” diameters, Tengco can supply virtually any special formed or assembled part required for the storage tank industry. All our storage tank hardware is manufactured to NSF, ANSI, SAE standards and our square head machine bolts have large flat sides that makes them easy to grip with a wrench and keep them from rotating in square holes. Square head machine bolts are frequently used in applications where visibility is limited but strong fastening is required, like the storage tank industry.