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Bolt
Nut
Bolts and Nuts
Bolts and Nuts
Bolts and Nuts
Bolts and Nuts
Nominal diameter
hole D (mm)
Pitch
P (mm)
Flat size
A/F (mm)
External diameter
A/C (mm)
Height H (mm)
1st
choice
2nd
choice
coarse fine ISO DIN JIS Hex Nut Jam Nut Nylon Nut
1 0.25 2.5
1.2 0.25
1.4 0.3
1.6 0.35 3.2
1.8 0.35
2 0.4 4 1.6 1.2 -
2.5 0.45 5 2 1.6 -
3 0.5 5.5 6.4 2.4 1.8 4
3.5 0.6 6
4 0.7 7 7 7 8.1 3.2 2.2 5
5 0.8 8 8 8 9.2 4 2.7 5
6 1 0.75 10 10 10 11.5 5 3.2 6
7 1 11 5.5 3.5 -
8 1.25 1 13 13 12 15 6.5 4 8
10 1.5 1.25 or 1 16 17 14 19.6 8 5 10
12 1.75 1.5 or 1.25 18 19 17 22.1 10 6 12
14 2 1.5 21 22 19 11 7 14
16 2 1.5 24 24 22 27.7 13 8 16
18 2.5 2 or 1.5 27 15 9 18.5
20 2.5 2 or 1.5 30 30 34.6 16 10 20
22 2.5 2 or 1.5 32
24 3 2 36 41.6 19
27 3 2 41
30 3.5 2 46 53.1 24
33 3.5 2
36 4 3 55 63.5 29
39 4 3
42 4.5 3
45 4.5 3
48 5 3
52 5 4
56 5.5 4
60 5.5 4
64 6 4
Note that flat (wrench) sizes differ from industry standards. For example, wrench sizes of fastener used in Japanese built cars comply with JIS automotive standard.

Mechanical specifications of Metric/English sized nuts

Material Proof strength Tensile yield strength (min.) Tensile ultimate strength (min.) Nut marking Nut class
ISO 898 (Metric)
Low or medium carbon steel 380 MPa (55 ksi) 420 MPa (61 ksi) 520 MPa (75 ksi) Nut marking Metric Class 5 8.png 5
Medium carbon steel Q&T 580 MPa (84 ksi) 640 MPa (93 ksi) 800 MPa (116 ksi) Nut marking Metric Class 8 8.png 8
Alloy steel Q&T 830 MPa (120 ksi) 940 MPa (136 ksi) 1040 MPa (151 ksi) Nut marking Metric Class 10 9.png 10
SAE J429 (English)
Low or medium carbon steel 55 ksi (379 MPa) 57 ksi (393 MPa) 74 ksi (510 MPa) Nut marking SAE Grade 2.png 2
Medium carbon steel Q&T 85 ksi (586 MPa) 92 ksi (634 MPa) 120 ksi (827 MPa) Nut marking SAE Grade 5.png 5
Alloy steel Q&T 120 ksi (827 MPa) 130 ksi (896 MPa) 150 ksi (1034 MPa) Nut marking SAE Grade 8.png 8
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