METRIC HEX FLANGE LOCK NUT (WITH NYLON INSERT) DIMENSIONS


Dimensions of metric hex flange lock nuts (with nylon insert) are shown in the following chart according to ISO 7043 and ISO 12125 standards.

Some important notes from the ISO standards about hex flange lock nuts with nylon insert:

- ISO 7043 specifies the characteristics of prevailing torque type hexagon nuts with flange (with non-metallic insert) with threads from M5 to M20 inclusive, with product grade A for threads d ≤ M16 and product grade B for threads d > M16.

- Mechanical properties of ISO 7043 hex flange lock nuts: Steel - Property class 8, 9 and 10.

- ISO 12125 specifies the characteristics of prevailing torque type hexagon nuts with flange (with non-metallic insert) with metric fine pitch thread with nominal thread diameters d from 8 mm up to and including 20 mm, with product grade A for threads d ≤ M16 and product grade B for threads d > M16.

- Mechanical properties of ISO 12125 hex flange lock nuts: Steel - Property class 6, 8 and 10.



Calculator:

INPUT PARAMETERS
Nominal metric hex flange lock nut size

 


Dimensions of Metric Hex Flange Lock Nuts (With Nylon Insert)
Metric Nut Dimensions 
Size Product
Grade
Standard Thread
Series
Pitch c da dc dw e h m mw s r
min max min max min min max min min min max min max
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--- --- --- --- --- --- --- --- --- --- --- --- --- --- --- --- ---
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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: Non-preferred threads according to ISO standards: M14.
Note 4: Non-metallic insert material: Non - metallic (Ex. polyamide).
Note 5: Nut body material : steel.
Note 6: Thread Tolerance : 6H.
Note 7: m: Minimum thread height.
Note 8: mw: Minimum wrenching height.
Note 9: Radius r applies both at the corner and the flats of the hexagon.

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.
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.
Prevailing Torque Values of Lock Nuts (Metric) Shows prevailing-on torque and prevailing-off torque values of metric lock nuts.

Reference:
  • ISO 7043:1997, Prevailing torque type hexagon nuts with flange (with non-metallic insert) — Product grades A and B
  • ISO 12125:1997, Prevailing torque type hexagon nuts with flange (with non-metallic insert) with metric fine pitch thread — Product grades A and B
  • ISO 4759-1:2000, Hexagon nuts — Bolts, screws, studs and nuts — Product grades A, B and C