Extra long, heavy walled hub prevents springing under full recommended load. Square head is designed to be turned with a wrench or a 4 / 8point socket due to high load capacity. Meets or exceeds us federal spec. GGG-C-406D.
From the Manufacturer
Armstrong Industrial Hand Tools have a heritage of Made in the USA since four brothers founded the company in 1890. This Armstrong brand product is built from premium materials and workmanship ensuring unequalled strength, toughness, and durability. Product Type: Heavy Duty Pattern C-Clamp Capacity Maximum (Inch): 8-1/4 Capacity Minimum (Inch): 2-1/4 Depth of Throat from Center of Screw (Inch): 3 Thread Size (Inch): 1-1/4-7 Length of Screw (Inch): 10-5/16 Minimum Proof Test (lbs): 31,250 Full Length Forcing Screw: No Finish: Black Oxide US Federal Specification: GGG-C-406d Replacement Forcing Screw: 95-401 Forcing Screw Threads: Standard V Threads.