Answer to Question #108498 in Mechanical Engineering for Amit Rajaram Shinde

Question

what is the meaning of white circle and black circle in Table 5 of standard IS1367 part 3.

Answer 1

This symbol is used to denote the bolt and screw diameter.

white circle denotes the bolt and screw with thread diameter , mm or

length, 2.5 mm

and black circle denotes the bolt and screw with thread diameter, or

length, as per Table 5 of standard IS1367 part 3.