society > occupation and work > equipment > building and constructing equipment > fastenings > [noun] > screw > thread > types of thread
worm1725
drunkenness1786
square thread1838
V-threada1877
buttress thread1882
knuckle-thread1887
1887 D. A. LowIntrod. Machine Drawing (1892) 15 The angles of the square thread are frequently rounded... If this rounding is carried to excess we get the Knuckle thread shown at (d).