2a nut thread thread class 0.250" nut thread thread length 0.500" overall length thread has two leads; head circumference has a 0.120 in. square key slot cut full depth toward center
2a nut thread thread class 0.465" nut thread thread length 0.500" overall length furnished with aluminum anodized plate, 1.250 in. dia with five holes 0.169 in. min 0.174 in.max dia equally spaced on 0.875 in. circle dia self-locking