SAE 188 9 3/8" - 12 1/4" diameter range 5/16" hex screw diameter Meet SAE J1508
9 3/8" - 12 1/4" diameter, 1/2" width, worm-drive hose clamps, SAE 188. Stainless steel band and housing with a carbon steel 5/16" slotted hex head screw. These are the most popular style of hose clamps for industrial and automotive applications. Meet SAE J1508.