What is the difference between IS 1364 Part 1 and Part 2?

Part 1 covers hexagon head bolts (partially threaded), while Part 2 covers hexagon head screws (fully threaded up to the head).

Which product grade should be used for an M30 hexagon screw?

Product grade B is used, as Grade A is only applicable for nominal diameters (d) up to 24 mm and lengths (l) up to 150 mm.

What thread tolerance is specified for these screws?

Tolerance class 6g is standard for the metric external threads on these hexagon head screws.

IS 1364 Part 2

: 2018

Hexagon head screws (sizes M1.6 to M64) of product grade A and B

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This standard specifies the dimensions, tolerances, and characteristics of hexagon head screws with metric threads from M1.6 up to M64. It is identical to ISO 4017:2014 and differentiates between Product Grade A (high precision, smaller sizes) and Product Grade B (standard precision, larger sizes).

Specifies characteristics for hexagon head screws with threads from M1.6 up to M64 and product grade A and B.

Quick Reference Values

thread size rangeM1.6 to M64

thread tolerance class6g

product grade A size limitd <= 24 mm and l <= 150 mm

product grade B size limitd > 24 mm or l > 150 mm

Practical Notes

Screws (Part 2) are typically threaded up to the head, whereas bolts (Part 1) have an unthreaded shank portion. Ensure you are specifying the correct fastener type.

This code specifies dimensions and tolerances. For mechanical properties, yield strength, and testing, you must cross-reference the IS 1367 series (e.g., specifying Property Class 8.8 or 10.9).

When designating the screw in drawings or BOQ, follow the standard format: 'Hexagon head screw IS 1364-2 - M12 x 40 - 8.8'.