Thimbles are of open type, confirming IS 2315 - 1978, Specification for Thimbles for Wire Ropes. They must be forged and hot dip galvanized with minimum zinc coat of 40 m m as per,

IS 2629 - Recommended Practice for Hot Dip Galvanizing of Iron & Steel.

Specification for Nuts/Bolts and Washers

Nuts/Bolts/Washers should be of Grade C , property Class 4.6 and confirm to :

IS 1363  -  1984 (Part 1)        Hexagonal Head bolts and Nuts,

IS 1367  -  1983                    Threaded Fasteners.

 It should be hot dip galvanized with minimum zinc coating of 40 m m. Electroplated galvanization is not acceptable.