0.33

0.4

0.5

0.55

same

1-Feb

1-Mar

2-Mar

0.25

0.45(r) 0.55

0.75

d

increases markedly

decreases markedly

remains same

depends on heat treatment carried out

has a head on one end and a nut fitted to the other

has head at one end and other end fits into a tapped hole in the other part to be joined

has both the ends threaded

is provided with pointed threads