Legend:
b - length of the thread (∑>Ω'at least)
l - length of bolt
d - the nominal diamet€£☆er of the thread
k - head height
r - radius
e - the diameter of the circumscπλδ♠ribed circle (not les✔≠s than)
s - size hex head turnkey
c - thickness of the mounting γ↔£collar
ds - diameter of the ¶ •&screw shank
u - thread run
lg - length of the shank ✘≤♥÷to thread
ls - length of the shank to the ☆‍​start of the thread
da - the maximum diameter oו₹©f the stem at the head of the scγγrew
dw - minimum diameter of the seat
k´ - minimum siz‌↕₹δe of the head on the key