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ISO 4032 · DIN 934 · ASME B18.2.2

Hex Nuts Manufacturer in India

The most used nut there is: six flats, a tapped hole, chamfered on both faces. We make hex nuts to ISO 4032, DIN 934 and ASME B18.2.2, in classes 5 to 12, stainless A2-70 and A4-70, brass and nickel alloys. Below: the nut drawn to scale, metric and inch dimension tables, where ISO and DIN differ, nut heights, classes and proof loads, and a finder.

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  • ISO 9001:2015 certified manufacturer
  • Metric and inch
  • Proof-load tested by lot
  • EN 10204 3.1 / 3.2
Two hexagon nuts, chamfered on both faces
Metric M5 – M39 Inch 1/4 – 4 in Classes 5 – 12
Overview

ISO 4032 / DIN 934 / ASME Hex Nuts: Manufacturer & Distributor

A hex nut carries the bolt load through its thread and its bearing face. Its height decides whether the bolt breaks before the thread strips, which is how the ISO system is designed; its width across flats decides the spanner.

Exotic Alloy manufactures and distributes hex nuts from Mumbai, India, for machine builders, structural and plant contractors, OEMs and fastener distributors. We supply across India and export to Indonesia, South-East Asia, the Gulf and Africa.

Three standards, one shape

ISO 4032 is the current metric standard for regular (style 1) nuts; DIN 934 is its withdrawn German predecessor, still on many drawings; ASME B18.2.2 covers inch hex nuts. For thicker nuts see heavy hex nuts, for thin ones jam nuts, and for bolts to match, hex bolts.

ISO 4032 DIN 934 ASME B18.2.2 Class 8 / 10 / 12 A2-70 / A4-70
Hex nuts at a glance
Metric
ISO 4032:2023, M5–M39 (+ M1.6–M4, M42–M64)
Older metric
DIN 934 (withdrawn)
Inch
ASME B18.2.2, 1/4 to 4 in
Height
Style 1: m min ≥ 0.8 D
Classes
ISO 898-2: 5, 6, 8, 10, 12
Stainless
A2-70, A4-70
Related
Heavy hex, jam, washers
ISO 4032 hexagon nut M12, style 1, drawn to scale in top view and side view: width across flats s 18 mm, width across corners e at least 20.03 mm, height m 10.37 to 10.8 mm, bearing face diameter dw at least 16.63 mm, M12 x 1.75 thread, chamfered on both faces s = 18 (spanner) e min 20.03 (sharp corners 20.78) dw min 16.63 bearing face M12 × 1.75 thread, 6H Top view Side view across corners m 10.37–10.8 chamfered both faces; either face can bear m min 10.37 = 0.86 D (style 1 needs ≥ 0.8 D) ISO 4032 hexagon nut M12, style 1, to scale EXOTIC ALLOY
An M12 nut to ISO 4032:2023, to scale. Across the corners it measures at least 20.03 mm, a little under the 20.78 mm of a sharp hexagon, because the corners are rounded off; the dashed circle is the bearing face dw.
Specification

Hex Nut Specification

The range we manufacture and distribute.

StandardsISO 4032, DIN 934, ASME B18.2.2; fine thread ISO 8673
Metric sizesM5 to M39; M1.6 to M4 and M42 to M64 on request
Inch sizes1/4 to 4 in, UNC, UNF and 8UN
ThreadMetric 6H; oversize 6AZ / 6AX for hot-dip galvanizing
Steel classesISO 898-2 classes 5, 6, 8, 10, 12; ASTM A563
Other materialsA2-70, A4-70; ASTM F594 stainless; brass; Monel, Inconel, duplex
FinishPlain, zinc plated, zinc flake, hot-dip galvanized, black oxide
Product gradeA up to M16, B above (ISO 4032)
CertificationEN 10204 3.1 with proof load and hardness; 3.2 on request
SupplyLoose, boxed or as sets with bolts and washers
ISO 4032

ISO 4032 Hex Nut Dimensions

Regular nuts, style 1, coarse thread, mm.

SizePitch Ps
max / min		e minm
max / min		dw minmw min≈ kg / 1000
steel
M50.88 / 7.788.794.7 / 4.47.23.521.44
M6110 / 9.7811.055.2 / 4.98.883.922.58
M7111 / 10.7312.126.5 / 6.149.634.913.68
M81.2513 / 12.7314.386.8 / 6.4411.635.155.56
M101.516 / 15.7317.778.4 / 8.0414.636.4310.2
M121.7518 / 17.7320.0310.8 / 10.3716.638.315.7
M14221 / 20.6723.3612.8 / 12.119.649.6825.2
M16224 / 23.6726.7514.8 / 14.122.4911.2837.6
M182.527 / 26.1629.5615.8 / 15.124.8512.0851.3
M202.530 / 29.1632.9518 / 16.927.713.5271.5
M222.534 / 3337.2919.4 / 18.131.3514.48101.5
M24336 / 3539.5521.5 / 20.233.2516.16123.1
M27341 / 4045.223.8 / 22.53818177.5
M303.546 / 4550.8525.6 / 24.342.7519.44244
M333.550 / 4955.3728.7 / 27.446.5521.92317
M36455 / 53.860.7931 / 29.451.1123.52419
M39460 / 58.866.4433.4 / 31.855.8625.44538

ISO 4032:2023. s across flats, e across corners, m height, dw bearing face, mw wrenching height. Product grade A to M16, B above; M7 is new in 2023. The 2012 edition has the same s, e and m; it gave dw and mw to one decimal (M12 dw 16.6 then, 16.63 now). Mass: our calculation for steel (hexagon minus the thread hole); it agrees with the DIN 934 masses within 5 %.

SizePitch Ps
max / min		e minm
max / min		dw min
M1.60.353.2 / 3.023.411.3 / 1.052.54
M20.44 / 3.824.321.6 / 1.353.34
M2.50.455 / 4.825.452 / 1.754.34
M30.55.5 / 5.326.012.4 / 2.154.84
M3.50.66 / 5.826.582.8 / 2.555.34
M40.77 / 6.787.663.2 / 2.96.2
M424.565 / 63.171.334 / 32.459.95
M454.570 / 68.176.9536 / 34.464.7
M48575 / 73.182.638 / 36.469.45
M52580 / 78.188.2542 / 40.474.2
M565.585 / 82.893.5645 / 43.478.66
M605.590 / 87.899.2148 / 46.483.41
M64695 / 92.8104.8651 / 49.188.16

ISO 4032:2023 Annex A. These nuts are lower than 0.8 D, so ISO 898-2 and ISO 3506-2 property classes do not apply; the standard advises against them for new or critical joints. We supply them with properties agreed on order.

ISO vs DIN

ISO 4032 vs DIN 934: What Changed

ISO 4032 and DIN 934 hexagon nuts overlaid to scale: at M12 the ISO nut is 18 mm across flats and 10.8 mm high, the DIN nut 19 mm and 10 mm; at M22 the ISO nut is 34 mm and 19.4 mm high, the DIN nut 32 mm and 18 mm; spanner sizes also differ at M10 (16 vs 17) and M14 (21 vs 22) ISO 4032 vs DIN 934, overlaid to scale ISO 4032 DIN 934 (withdrawn) M12 M12 ISO height 10.8 mm 10.8 ISO M12 DIN height 10 mm 10 DIN height m max spanner 18 mm (ISO) vs 19 mm (DIN) M22 M22 ISO height 19.4 mm 19.4 ISO M22 DIN height 18 mm 18 DIN height m max spanner 34 mm (ISO) vs 32 mm (DIN) Spanner sizes differ at M10 (16 / 17), M12 (18 / 19), M14 (21 / 22) and M22 (34 / 32); all other sizes match. EXOTIC ALLOY
Same thread, different spanner. At M12 the ISO nut is 1 mm narrower and 0.8 mm taller; at M22 it is 2 mm wider and 1.4 mm taller.
SizeSpanner s
ISO 4032		Spanner s
DIN 934		Height m max
ISO 4032		Height m max
DIN 934		DIN 934
kg / 1000
M5884.741.23
M610105.252.5
M711116.55.53.12
M813136.86.55.2
M1016178.4811.6
M12181910.81017.3
M14212212.81125
M16242414.81333.3
M18272715.81549.4
M203030181664.4
M22343219.41879
M24363621.519110
M27414123.822165
M30464625.624223
M33505028.726288
M3655553129393
M39606033.431502

DIN 934:1987 (same values in the 1982 edition); highlighted cells are spanner sizes that differ from ISO 4032. DIN 934 was replaced by ISO 4032 (and ISO 8673 / 8674 for fine thread). Order DIN 934 only where the drawing or the spanner demands it.

Inch

ASME B18.2.2 Inch Hex Nut Dimensions

SizeUNC
tpi		Across flats F
max / min, in		Across corners G
max / min, in		Thickness H
max / min, in		F max
mm
1/4200.438 / 0.4280.505 / 0.4880.226 / 0.21211.1
5/16180.500 / 0.4890.577 / 0.5570.273 / 0.25812.7
3/8160.563 / 0.5510.650 / 0.6280.337 / 0.32014.3
7/16140.688 / 0.6750.794 / 0.7680.385 / 0.36517.5
1/2130.750 / 0.7360.866 / 0.8400.448 / 0.42719.0
9/16120.875 / 0.8611.010 / 0.9820.496 / 0.47322.2
5/8110.938 / 0.9221.083 / 1.0510.559 / 0.53523.8
3/4101.125 / 1.0881.299 / 1.2400.665 / 0.61728.6
7/891.312 / 1.2691.516 / 1.4470.776 / 0.72433.3
181.500 / 1.4501.732 / 1.6530.887 / 0.83138.1
1-1/871.688 / 1.6311.949 / 1.8590.999 / 0.93942.9
1-1/471.875 / 1.8122.165 / 2.0661.094 / 1.03047.6
1-3/862.062 / 1.9942.382 / 2.2731.206 / 1.13852.4
1-1/262.250 / 2.1752.598 / 2.4801.317 / 1.24557.1
1-5/8–2.430 / 2.3502.805 / 2.6791.416 / 1.36461.7
1-3/452.625 / 2.5383.031 / 2.8931.540 / 1.46066.7
1-7/8–2.813 / 2.7223.247 / 3.1031.651 / 1.56771.5
24½3.000 / 2.9003.464 / 3.3061.763 / 1.67576.2
2-1/44½3.375 / 3.2633.897 / 3.7191.986 / 1.89085.7
2-1/243.750 / 3.6254.330 / 4.1332.209 / 2.10595.2
2-3/444.125 / 3.9884.763 / 4.5462.431 / 2.319104.8
344.500 / 4.3505.196 / 4.9592.654 / 2.534114.3
3-1/444.875 / 4.7135.629 / 5.3732.877 / 2.749123.8
3-1/245.250 / 5.0756.062 / 5.7863.100 / 2.964133.3
3-3/445.625 / 5.4386.495 / 6.1993.322 / 3.178142.9
446.000 / 5.8006.928 / 6.6123.545 / 3.393152.4

ASME B18.2.2-2022 Table 5 (unchanged from the 2015 edition), inch. UNF is also standard to 1-1/2 in and 8UN from 1-1/8 in. Material specifications: ASTM A563 (carbon steel), F594 (stainless), F467 (non-ferrous). For the thicker nuts used on structural and flange bolts see heavy hex nuts.

Nut height

Why Nut Height Matters: Style 1, Style 2 & DIN 934

Minimum nut height divided by thread diameter for M5 to M39: ISO 4033 style 2 nuts run 0.89 to 0.98 D, ISO 4032 style 1 nuts 0.80 to 0.88 D and never below the 0.8 D that ISO 898-2 sets for style 1, while the withdrawn DIN 934 nuts are 0.74 to 0.80 D, below 0.8 D at every size except M12 Minimum nut height as a share of the thread diameter, m min / D 0.7 D 0.8 D 0.9 D 1.0 D dashed line: 0.8 D, the style 1 minimum of ISO 898-2 M5 M8 M12 M16 M20 M24 M30 M36 M39 ISO 4033 style 2 M5: m min 4.8 mm = 0.96 D ISO 4033 style 2 M6: m min 5.4 mm = 0.90 D ISO 4033 style 2 M7: m min 6.84 mm = 0.98 D ISO 4033 style 2 M8: m min 7.14 mm = 0.89 D ISO 4033 style 2 M10: m min 8.94 mm = 0.89 D ISO 4033 style 2 M12: m min 11.57 mm = 0.96 D ISO 4033 style 2 M14: m min 13.4 mm = 0.96 D ISO 4033 style 2 M16: m min 15.7 mm = 0.98 D ISO 4033 style 2 M18: m min 16.9 mm = 0.94 D ISO 4033 style 2 M20: m min 19 mm = 0.95 D ISO 4033 style 2 M22: m min 20.5 mm = 0.93 D ISO 4033 style 2 M24: m min 22.6 mm = 0.94 D ISO 4033 style 2 M27: m min 25.4 mm = 0.94 D ISO 4033 style 2 M30: m min 27.3 mm = 0.91 D ISO 4033 style 2 M33: m min 30.9 mm = 0.94 D ISO 4033 style 2 M36: m min 33.1 mm = 0.92 D ISO 4033 style 2 M39: m min 35.9 mm = 0.92 D ISO 4033 style 2 ISO 4032 style 1 M5: m min 4.4 mm = 0.88 D ISO 4032 style 1 M6: m min 4.9 mm = 0.82 D ISO 4032 style 1 M7: m min 6.14 mm = 0.88 D ISO 4032 style 1 M8: m min 6.44 mm = 0.81 D ISO 4032 style 1 M10: m min 8.04 mm = 0.80 D ISO 4032 style 1 M12: m min 10.37 mm = 0.86 D ISO 4032 style 1 M14: m min 12.1 mm = 0.86 D ISO 4032 style 1 M16: m min 14.1 mm = 0.88 D ISO 4032 style 1 M18: m min 15.1 mm = 0.84 D ISO 4032 style 1 M20: m min 16.9 mm = 0.84 D ISO 4032 style 1 M22: m min 18.1 mm = 0.82 D ISO 4032 style 1 M24: m min 20.2 mm = 0.84 D ISO 4032 style 1 M27: m min 22.5 mm = 0.83 D ISO 4032 style 1 M30: m min 24.3 mm = 0.81 D ISO 4032 style 1 M33: m min 27.4 mm = 0.83 D ISO 4032 style 1 M36: m min 29.4 mm = 0.82 D ISO 4032 style 1 M39: m min 31.8 mm = 0.82 D ISO 4032 style 1 DIN 934 M5: m min 3.7 mm = 0.74 D DIN 934 M6: m min 4.7 mm = 0.78 D DIN 934 M7: m min 5.2 mm = 0.74 D DIN 934 M8: m min 6.14 mm = 0.77 D DIN 934 M10: m min 7.64 mm = 0.76 D DIN 934 M12: m min 9.64 mm = 0.80 D DIN 934 M14: m min 10.3 mm = 0.74 D DIN 934 M16: m min 12.3 mm = 0.77 D DIN 934 M18: m min 14.3 mm = 0.79 D DIN 934 M20: m min 14.9 mm = 0.74 D DIN 934 M22: m min 16.9 mm = 0.77 D DIN 934 M24: m min 17.7 mm = 0.74 D DIN 934 M27: m min 20.7 mm = 0.77 D DIN 934 M30: m min 22.7 mm = 0.76 D DIN 934 M33: m min 24.7 mm = 0.75 D DIN 934 M36: m min 27.4 mm = 0.76 D DIN 934 M39: m min 29.4 mm = 0.75 D DIN 934 ISO 4033 style 2 ISO 4032 style 1 DIN 934 EXOTIC ALLOY
ISO raised the nut heights. Every ISO 4032 nut is at least 0.8 D high; DIN 934 nuts are lower at every size except M12. Hover a dot for the value.
  • A bolted joint should fail by the bolt breaking, which shows, not by the thread stripping, which may not.
  • ISO 898-2 sets the nut heights and hardness so that a nut of the matching class reaches the bolt's strength.
  • Style 1 (ISO 4032): m min ≥ 0.8 D. Style 2 (ISO 4033): about 0.9 D and more.
  • Nuts lower than 0.8 D are thin nuts (style 0), classes 04 and 05, and are not meant to carry the full bolt load.
SizesStyle 1 (ISO 4032)
m min / ratio		Style 2 (ISO 4033)
m min / ratio		DIN 934
m min / ratio
M584.4 / 0.88D4.8 / 0.96D3.7 / 0.74D
M6104.9 / 0.82D5.4 / 0.90D4.7 / 0.78D
M7116.14 / 0.88D6.84 / 0.98D5.2 / 0.74D
M8136.44 / 0.81D7.14 / 0.89D6.14 / 0.77D
M10168.04 / 0.80D8.94 / 0.89D7.64 / 0.76D
M121810.37 / 0.86D11.57 / 0.96D9.64 / 0.80D
M142112.1 / 0.86D13.4 / 0.96D10.3 / 0.74D
M162414.1 / 0.88D15.7 / 0.98D12.3 / 0.77D
M182715.1 / 0.84D16.9 / 0.94D14.3 / 0.79D
M203016.9 / 0.84D19 / 0.95D14.9 / 0.74D
M223418.1 / 0.82D20.5 / 0.93D16.9 / 0.77D
M243620.2 / 0.84D22.6 / 0.94D17.7 / 0.74D
M274122.5 / 0.83D25.4 / 0.94D20.7 / 0.77D
M304624.3 / 0.81D27.3 / 0.91D22.7 / 0.76D
M335027.4 / 0.83D30.9 / 0.94D24.7 / 0.75D
M365529.4 / 0.82D33.1 / 0.92D27.4 / 0.76D
M396031.8 / 0.82D35.9 / 0.92D29.4 / 0.75D

Minimum heights: ISO 898-2:2012 Table A.1 (equal to ISO 4032 and ISO 4033); DIN 934:1987. Highlighted: below 0.8 D.

Finder

Hex Nut Finder: Spanner, Height & Proof Load

Pick the standard, size and class; get the dimensions, the load and the order line.

Nut & order

Dimensions from the tables on this page. Proof loads from ISO 898-2:2012 Table 4 for steel nuts to ISO 4032; DIN 934 steel classes follow DIN 267-4 and stainless nuts ISO 3506-2, so no proof load is shown for them. Mass: our calculation for steel (stainless 1 to 2 % more), or the DIN 934 table.

Result
18
mm spanner (across flats)
10.8
mm height m max (min 10.37)
Thread:M12 × 1.75, 6H
Across corners e min:20.03 mm
Bearing face dw min:16.63 mm
Proof load:74.2 kN
Mates with bolts up to:8.8
Mass (approx.):15.7 kg per 1000, 15.7 kg
Designation:1000 pcs Hexagon nut ISO 4032 – M12 – 8

Classes

Property Classes, Proof Loads & Materials

Pairing nuts with bolts by property class: a class 8 nut for bolts up to 8.8, a class 10 nut for bolts up to 10.9 and a class 12 nut for 12.9 bolts; the nut class is the first number of the bolt class, and a nut of a higher class may replace a lower one Nut class = first number of the highest bolt class it may carry (ISO 898-2) 8.8 bolt head 8 nut, class 8 8.8 bolt + class 8 nut 10.9 bolt head 10 nut, class 10 10.9 bolt + class 10 nut 12.9 bolt head 12 nut, class 12 12.9 bolt + class 12 nut Class 12 regular (style 1) nuts exist only to M16; above, use a style 2 high nut. Marking: class number on the face or chamfer. EXOTIC ALLOY
Match the nut to the bolt. A nut of a higher class may always replace a lower one.
Nut classMates with bolts up toStyle 1 sizesHeat treatment (coarse thread)
55.8M5–M39Not required
66.8M5–M39Not required
88.8M5–M39Not required to M16; quenched & tempered above M16
1010.9M5–M39Quenched & tempered
1212.9M5–M16Quenched & tempered

ISO 898-2:2012 Tables 1 to 3, regular nuts (style 1) with coarse thread.

Proof loads, regular nuts (style 1)

SizePitch PClass 5
kN		Class 6
kN		Class 8
kN		Class 10
kN		Class 12
kN
M50.88.29.512.114.816.3
M6111.713.517.220.923.1
M7116.819.424.730.133.2
M81.2521.624.931.838.142.5
M101.534.239.450.560.367.3
M121.7551.459.074.288.5100.3
M14270.280.5101.2120.8136.9
M16295.8109.9138.2164.9186.8
M182.5121.0138.2176.6203.5style 2
M202.5154.4176.4225.4259.7style 2
M222.5190.9218.2278.8321.2style 2
M243222.4254.2324.8374.2style 2
M273289.2330.5422.3486.5style 2
M303.5353.4403.9516.1594.7style 2
M333.5437.2499.7638.5735.6style 2
M364514.7588.2751.6866.0style 2
M394614.9702.7897.91035.0style 2

ISO 898-2:2012 Table 4, coarse thread: the nut must carry this load on a hardened test mandrel without stripping or cracking. Class 12 in style 1 stops at M16. ISO 898-2 was revised in 2022 (class 9 deleted, other properties updated); we test to the edition on your order.

Hardness, regular nuts

Nut classM5–M16
HV min / max		M16–M39
HV min / max
5130 / 302146 / 302
6150 / 302170 / 302
8200 / 302233 / 353
10272 / 353272 / 353
12295 / 353style 2 only

ISO 898-2:2012 Table 6, Vickers.

Marking

  • Class number (5, 6, 8, 10, 12) and the maker's mark on every class-rated nut.
  • Indented on the face or side, or embossed on the chamfer, never standing proud of the bearing face.
  • Small nuts may use the clock-face system; the twelve o'clock position carries the maker's mark or a dot.
  • Stainless nuts carry A2-70 or A4-70.
Carbon steel
Class 5 · 6 · 8 · 10 · 12

Plain, zinc or galvanized.

10351045
Stainless
A2-70 · A4-70

As in the photo.

304316
Special alloys
Brass · Monel · duplex

Marine and chemical duty.

BrassMonel 4002205
Manufacturing

How Our Hex Nuts Are Made

1

Wire / bar

Steel to the class chemistry, certified by heat.

2

Form

Hexagon, chamfers and pierce, cold or hot forged.

3

Tap

Thread tapped to 6H, or oversize for galvanizing.

4

Heat treat

Quenched and tempered where the class requires.

5

Finish

Zinc, zinc flake, galvanized or plain.

6

Test

Gauged, hardness and proof load per lot.

Applications

Where Our Hex Nuts Are Used

Machinery

Frames, guards, drives and machine bases.

Steel structures

Secondary steel, platforms and supports.

Process plant

Pipe supports, skids and equipment mounts.

Automotive

Brackets, chassis and assemblies.

Solar & power

Galvanized and stainless nuts for outdoor frames.

Marine

A4-70, duplex and Monel nuts.

Quality & testing

Hex Nut Inspection & Certification

CheckMethodApplied to
ThreadGO / NOT GO plug gauges, 6HEvery lot
s, e, mCalipers, height gaugeEvery lot
Proof loadHardened mandrel, ISO 898-2 Table 4Every class-rated lot
HardnessVickers (reference), Brinell or RockwellEvery lot
StainlessProof load to ISO 3506-2; PMIA2 / A4 lots
CoatingThickness gauge, salt spray on requestCoated lots

Every shipment includes

  • EN 10204 3.1 certificate
  • Class and maker's mark on the nuts
  • Lot number on every box

On request

  • EN 10204 3.2 with third-party inspection
  • Dimensional and coating reports
  • Matched bolt, nut and washer sets
FAQ

Hex Nut Questions, Answered

DIN 934 has been withdrawn and replaced by ISO 4032. The spanner sizes differ at M10 (16 mm ISO, 17 mm DIN), M12 (18 and 19), M14 (21 and 22) and M22 (34 and 32), and ISO 4032 nuts are taller at every size: an M12 nut is 10.8 mm high to ISO 4032 and 10 mm to DIN 934.

18 mm for an ISO 4032 nut and 19 mm for a DIN 934 nut. An M10 nut takes 16 mm (ISO) or 17 mm (DIN), an M16 nut 24 mm and an M20 nut 30 mm in both standards.

A regular ISO 4032 (style 1) nut is at least 0.8 times the thread diameter high: an M12 nut 10.37 to 10.8 mm, an M20 nut 16.9 to 18 mm. High nuts to ISO 4033 (style 2) are taller, for example 11.57 to 12 mm at M12.

A class 8 nut, or a higher class. ISO 898-2 pairs nut class 5 with bolts up to 5.8, 6 with 6.8, 8 with 8.8, 10 with 10.9 and 12 with 12.9. Regular class 12 nuts are made only up to M16.

74.2 kN for a regular nut with coarse thread, in ISO 898-2:2012 Table 4. The same size takes 88.5 kN in class 10 and 100.3 kN in class 12.

Yes. ISO 4032:2023 keeps M1.6 to M4 and M42 to M64 in an informative annex as historical sizes. Their height is below 0.8 times the diameter, so the property classes of ISO 898-2 and ISO 3506-2 do not apply and the mechanical properties are agreed with the buyer.

To ASME B18.2.2 a 1/2-13 hex nut is 0.736 to 0.750 in across flats, 0.840 to 0.866 in across corners and 0.427 to 0.448 in thick. A 1 in hex nut is 1.450 to 1.500 in across flats and 0.831 to 0.887 in thick.

With the property class number and the maker's mark, indented on the face or side or embossed on the chamfer. Small nuts can use the clock-face system instead, with the twelve o'clock position marked by the maker's mark or a dot.

Not quite. Galvanized nuts are tapped oversize (for example 6AZ or 6AX instead of 6H) to fit over the coated bolt, and ISO 898-2 notes that this lowers their thread stripping strength.
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