IS 7906 : Part 7 : 1989 Helical compression springs:Part 7 Quality requirements for cylindrical coil compression springs used mainly as vehicle suspension springs

1 Scope

1.1 This standard (Part 7) lays down permissible deviation of springparameters of hot coiled cylindrical compression springs made from round barsteel and produced on large scale.

1.2 This standard is applicable to springs meeting with This conditions:

a) Large-scale production, minimum lot size 5 000 pieces.

b) Bar length (l) up to 4 300 mm.

c) Bar diameter (d) from 9 to 18 mm.

d) Length of unloaded spring (free length) (L_o) up to 600mm.

e) External coil diameter (D_e) up to 180 mm.

f) Number of active coils (n) from 5 to 12.

g) Total spring deflection (s_c) 180 mm and more.

h) Spring index (W) from 6 to 12.