HEX NUT DIMENSIONS (METRIC)

Metric hex nut sizes and dimensions are shown in the following chart according to ISO 4032, ISO 4033, ISO 4034 and ISO 4759-1 standards.

Some important notes from the ISO standards about metric hex nuts:

- ISO 4032 specifies the characteristics of hex regular nuts, style 1, with threads from M1.6 up to including M64, with product grade A for threads d ≤ M16 and product grade B for threads d > M16.

- Mechanical properties of ISO 4032 hex regular nuts: Steel - M3 ≤ d ≤ M39 - Property class 6, 8, 10 , Stainless steel - d ≤ M24: Property class A2-70, A4-70 , M24 < d ≤ M39 - Property class A2-50, A4-50

- ISO 4033 specifies the characteristics of hex high nuts, style 2, with threads from M5 up to and including M36, with product grade A for threads d ≤ M16 and product grade B for threads d > M16.

- Mechanical properties of ISO 4033 hex high nuts: Steel - Property class 9 and 12

- ISO 4034 specifies the characteristics of hex regular nuts, with threads from M5 up to and including M64 and product grade C.

- Mechanical properties of ISO 4034 hex regular nuts: Steel - M16 ≤ d - Property class 5, M16 < d ≤ M39 - Property class 4, 5

Calculator:

INPUT PARAMETERS
Nominal metric hex nut size

 


Dimensions of Metric Hex Nuts
Metric Nut Dimensions 
Size Product
Grade
Standard Thread Tolerance Pitch c da dw e m mw s
max min max min min min max min min max min
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Note 1: Dimensions are in mm.
Note 2: Requirements for electroplating are covered in ISO 4042 for steel nuts
Note 3: Requirements for nonelectrolytically applied zinc flake coatings are covered in ISO 10683 for steel nuts.
Note 4: Non-preferred threads according to ISO standards: M3.5, M14, M18, M22, M27, M33, M39, M45, M52, M60.

Definitions:

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.

Supplements:



Link Usage
Metric Thread Size and Tolerance 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.
Hex Nut Dimensions - Metric Fine Pitch Thread Shows dimensions of a selected metric hex nut with fine 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.

Reference:
  • ISO 4032:1999, Hexagon regular nuts (style 1) — Product grades A and B
  • ISO 4033:1999, Hexagon high nuts (style 2) — Product grades A and B
  • ISO 4034:1999, Hexagon regular nuts (style 1) — Product grade C
  • ISO 4759-1:2000, Hexagon nuts — Bolts, screws, studs and nuts — Product grades A, B and C