Al Metal Special Metal Parts

ISO, ANSI and DIN comparison of hexagon head bolts and screws

This table contains information on ISO, ANSI and DIN comparison of hexagon head bolts and screws.

values in mm

¹⁾The DIN 931/933 standards dated 1982/1983 are in agreement with ISO 4014/17 standards dated 1979.

THREAD LENGTH: b (partially threaded)

For nominal length up to 125:

No deviations between ISO, ANSI and DIN.

For nominal length above 125 up to 200:

No deviations between ISO, ANSI and DIN. ISO does not specify a thread length for the sizes M 5 and M 6. Above these sizes the thread length is identical to DIN and ANSI.

For nominal length above 200:

For the sizes M 5, M 6 and M 8 only ANSI specifies a thread length. M 10 and above no deviation in thread length between DIN and ANSI. ISO does not stipulate a thread length up to M 16. M 16 and above no deviation between the 3 standards.

THREAD TOLERANCE:

All standards specify a thread tolerance of 6g before plating, and 6h after plating. All the other geometric functions are the same and are functionally interchangeable.

BODY DIAMETER: ds

No deviations between ISO, ANSI and DIN.

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