JIS B 1188 is the Japanese Industrial Standard for , commonly known as "SEMS" screws. These fasteners consist of a screw blank with one or more washers (flat, split lock, or tooth) permanently attached during manufacturing before the threads are rolled. Key Technical Specifications
Usually includes just a split lock washer or a flat washer. jis b 1188 pdf
: You can view the dimensions for small pan Phillips screws with double washers in the RC Fastener Spec Sheet Dimensions & Materials ITP Bolt Catalog cross-recessed head screws with captive washers JIS B
Typically M2 to M12, with M3, M4, M5, and M6 being most common Clear Zinc, Yellow Zinc, Black Zinc, and Nickel Plating Key Components & Variations Tighter tolerance on head height (k) for M8