Dimensions Chart for Metric Hex Flange Nut with Fine Pitch Thread according to the ISO 10663 standard.

Some important notes from the ISO standard:

- ISO 10663 specifies the characteristics of hexagon nuts with flange and metric fine pitch thread with nominal thread diameters from 8 mm to 20 mm, with product grade A for threads d ≤ M16 and product grade B for threads d > M16.

- Mechanical properties of ISO 10663 metric hex flange nuts: Steel - Property class 8, 10 and 12. Stainless steel - Property class A2-70

Metric Hex Flange Nut with Fine Pitch Thread Dimensions:

Nominal metric hex flange nut size


Dimensions of Metric Hex Flange Nuts
Size ---
Product Grade ---
Standard ---
Pitch ---
cmin ---
da max ---
da min ---
dc max ---
dw min ---
e min ---
m max ---
m min ---
mw min ---
smax ---
smin ---
rmax ---

Note 1: Dimensions are in mm.

Note 2: Requirements for electroplating are covered in ISO 4042 for steel nuts

Note 3: Radius r applies both at the corners and the flats of the hexagon.

Note 4: Thread tolerance of hex flange nuts is 6H.


Product Grade A, Grade B and Grade C: The product grades refer to the size of the tolerances where grade A is the most precise and grade C is the least precise as defined in the ISO 4759-1:2000 standard.


Link Usage
Metric Thread Calculator Calculates basic major, minor and pitch diameters of the metric external (bolt) thread and internal (nut) thread according to ISO 724:1993 standard. In addition to basic size calculations, tolerance calculations of different tolerance classes can be done according to ISO 965-1:1998 and ISO 965-2:1998 standards.
Metric Hex Flange Nut Dimensions - Coarse Pitch Thread Shows dimensions of a selected hex flange nut with coarse pitch thread.
Nut Grades, Identification Markings and Strength (Metric) Shows proof strength and Vickers and Brinell hardness values of metric nuts made of carbon steel and alloy steel.


  • ISO 10663:1999, Hexagon nuts with flange — Fine pitch thread
  • ISO 4759-1:2000, Hexagon nuts — Bolts, screws, studs and nuts — Product grades A, B and C