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Hexagon Bolts (Excerpt from JIS B 1180 2014)

Last updated:18 June 2019

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Nominal Diameter Hexagon Bolt – Coarse Screw – Part Grade A Shapes/Dimensions

Unit [mm]

Nominal screw diameter　d M3 M4 M5 M6 M8 M10 M12 M16 M20 M24
P 0.5 0.7 0.8 1 1.25 1.5 1.75 2 2.5 3
b
（Reference）		 ℓ≦125 12 14 16 18 22 26 30 38 46 54
125＜ℓ≦150 18 20 22 24 28 32 36 44 52 60
c Min. 0.15 0.15 0.15 0.15 0.15 0.15 0.15 0.2 0.2 0.2
Max. 0.40 0.40 0.50 0.50 0.60 0.60 0.60 0.8 0.8 0.8
da Max. 3.6 4.7 5.7 6.8 9.2 11.2 13.7 17.7 22.4 26.4
ds Standard size=Max. 3.00 4.00 5.00 6.00 8.00 10.00 12.00 16.00 20.00 24.00
Min. 2.86 3.82 4.82 5.82 7.78 9.78 11.73 15.73 19.67 23.67
dw Min. 4.57 5.88 6.88 8.88 11.63 14.63 16.63 22.49 28.19 33.61
e Min. 6.01 7.66 8.79 11.05 14.38 17.77 20.03 26.75 33.53 39.98
f Max. 1 1.2 1.2 1.4 2 2 3 3 4 4
k Standard size 2 2.8 3.5 4 5.3 6.4 7.5 10 12.5 15
Min. 1.875 2.675 3.35 3.85 5.15 6.22 7.32 9.82 12.285 14.785
Max. 2.125 2.925 3.65 4.15 5.45 6.58 7.68 10.18 12.715 15.215
k' Min. 1.31 1.87 2.35 2.70 3.61 4.35 5.12 6.87 8.6 10.35
r Min. 0.1 0.2 0.2 0.25 0.4 0.4 0.6 0.6 0.8 0.8
s Standard size=Max. 5.50 7.00 8.00 10.00 13.00 16.00 18.00 24.00 30.00 36.00
Min. 5.32 6.78 7.78 9.78 12.73 15.73 17.73 23.67 29.67 35.38

Unit [mm]

Nominal screw diameter M3 M4 M5 M6 M8 M10 M12 M16 M20 M24
ℓ ℓs and ℓg
Nominal size Min. Max. ℓs
Min.		 ℓg
Max.		 ℓs
Min.		 ℓg
Max.		 ℓs
Min.		 ℓg
Max.		 ℓs
Min.		 ℓg
Max.		 ℓs
Min.		 ℓg
Max.		 ℓs
Min.		 ℓg
Max.		 ℓs
Min.		 ℓg
Max.		 ℓs
Min.		 ℓg
Max.		 ℓs
Min.		 ℓg
Max.		 ℓs
Min.		 ℓg
Max.
20 19.58 20.42 5.5 8
25 24.58 25.42 10.5 13 7.5 11 5 9
30 29.58 30.42 15.5 18 12.5 16 10 14 7 12
35 34.5 35.5 17.5 21 15 19 12 17
40 39.5 40.5 22.5 26 20 24 17 22 11.75 18
45 44.5 45.5 25 29 22 27 16.75 23 11.5 19
50 49.5 50.5 30 34 27 32 21.75 28 16.5 24 11.25 20
55 54.4 55.6 32 37 26.75 33 21.5 29 16.25 25
60 59.4 60.6 37 42 31.75 38 26.5 34 21.25 30
65 64.4 65.6 36.75 43 31.5 39 26.25 35 17 27
70 69.4 70.6 41.75 48 36.5 44 31.25 40 22 32
80 79.4 80.6 51.75 58 46.5 54 41.25 50 32 42 21.5 34
90 89.3 90.7 56.5 64 51.25 60 42 52 31.5 44 21 36
100 99.3 100.7 66.5 74 61.25 70 52 62 41.5 54 31 46
110 109.3 110.7 71.25 80 62 72 51.5 64 41 56
120 119.3 120.7 81.25 90 72 82 61.5 74 51 66
130 129.2 130.8 76 86 65.5 78 55 70
140 139.2 140.8 86 96 75.5 88 65 80
150 149.2 150.8 96 106 85.5 98 75 90
For bolts where ℓ is located in the area above the thick stepped line, a complete screw part is better.
・Recommended nominal lengths are where values are given in ℓ s and ℓ g columns in the table.
・P is the screw pitch. ・b) With regard to ℓ nom ≦ 125 mm.
・c) With regard to 125 mm ＜ ℓ nom ≦ 200 mm.
・kw min ＝ 0.7kmin
・ℓ g max ＝ℓ nom － b
・ℓ s min ＝ℓ g max － 5P

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