scope:

This standard specifies requirements for hexagon fits bolts with long thread with a thread diameter d from 8 mm to 52 mm, of product grade A for a thread diameter d ≤ 10 mm and of product grade B for a thread diameter d ≥ 12 mm.

This standard applies for hexagon fits bolts with a thread diameter d > 39 mm only with regard to dimensions and tolerances. The other properties shall be agreed upon in a suitable manner.

NOTE This standard contains the new widths across flats 16 mm, 18 mm, 21 mm and 34 mm according to DIN ISO 272 for the thread diameters d = 10 mm, 12 mm, 14 mm and 22 mm. The old widths across flats (17 mm, 19 mm, 22 mm and 32 mm) have been included in Annex A.