No. 10-32 size designation internal thd by 5/16-18 size designation external thd insert screw thd
A locking device which is serrated on the inside and outside diameters. It may have outer serrations omitted on one or two sides for close edge installation. The inner serrations engage the mating serrations of bolts, inserts, nuts, studs or similar items to be locked in place. The outer serrations broach their way into parent material when driven or pressed into place.
NSN 6220-01-400-4203
NSN 6240-01-496-3847
NSN 6685-01-392-4810
NSN 6645-01-633-1852
NSN 5855-01-224-7975
NSN 5960-01-453-6170
NSN 5920-01-351-5536
NSN 5920-00-246-5992
NSN 5895-01-492-0077
NSN 6220-01-605-9623
NSN 6150-00-295-3869
NSN 6645-01-477-5316