ボルト長さテーブル PW/I

図内の記号

記号単位説明
dmmボルトのねじの呼び径
pmmボルトのねじのピッチ
Lmmボルトの長さ
Xminmmめねじ挿入長さ0.8d超2d以下の被締結体の最小厚さ
Xmaxmmめねじ挿入長さ0.8dのときの被締結体の厚さ

表の説明

項目説明
列Lボルトの長さL
列(L)*付きのLは非推奨長さ
列M#ボルトのねじの呼びM#、長さLのときの Xmin | Xmax

M3からM16まで

L(L)M3M3.5M4M4.5M5M6M8M10M12M14M16
5 0 | 2.1 0 | 1.7 x | x x | x x | x x | x x | x x | x x | x x | x x | x
6 0 | 3.1 0 | 2.7 0 | 2.0 0 | 1.6 x | x x | x x | x x | x x | x x | x x | x
7* 0.5 | 4.1 0 | 3.7 0 | 3.0 0 | 2.6 0 | 2.0 0 | 0.6 x | x x | x x | x x | x x | x
8 1.5 | 5.1 0.5 | 4.7 0 | 4.0 0 | 3.6 0 | 3.0 0 | 1.6 x | x x | x x | x x | x x | x
9* 2.5 | 6.1 1.5 | 5.7 0.2 | 5.0 0 | 4.6 0 | 4.0 0 | 2.6 x | x x | x x | x x | x x | x
10 3.5 | 7.1 2.5 | 6.7 1.2 | 6.0 0.2 | 5.6 0 | 5.0 0 | 3.6 x | x x | x x | x x | x x | x
11* 4.5 | 8.1 3.5 | 7.7 2.2 | 7.0 1.2 | 6.6 0.0 | 6.0 0 | 4.6 0 | 3.0 x | x x | x x | x x | x
12 5.5 | 9.1 4.5 | 8.7 3.2 | 8.0 2.2 | 7.6 1.0 | 7.0 0 | 5.6 0 | 4.0 x | x x | x x | x x | x
14 7.5 | 11.1 6.5 | 10.7 5.2 | 10.0 4.2 | 9.6 3.0 | 9.0 0.4 | 7.6 0 | 6.0 0 | 4.0 x | x x | x x | x
16 9.5 | 13.1 8.5 | 12.7 7.2 | 12.0 6.2 | 11.6 5.0 | 11.0 2.4 | 9.6 0 | 8.0 0 | 6.0 x | x x | x x | x
18* 11.5 | 15.1 10.5 | 14.7 9.2 | 14.0 8.2 | 13.6 7.0 | 13.0 4.4 | 11.6 0.4 | 10.0 0 | 8.0 0 | 5.9 x | x x | x
20 13.5 | 17.1 12.5 | 16.7 11.2 | 16.0 10.2 | 15.6 9.0 | 15.0 6.4 | 13.6 2.4 | 12.0 0 | 10.0 0 | 7.9 0 | 6.3 x | x
22* 15.5 | 19.1 14.5 | 18.7 13.2 | 18.0 12.2 | 17.6 11.0 | 17.0 8.4 | 15.6 4.4 | 14.0 0.0 | 12.0 0 | 9.9 0 | 8.3 0 | 6.2
25 18.5 | 22.1 17.5 | 21.7 16.2 | 21.0 15.2 | 20.6 14.0 | 20.0 11.4 | 18.6 7.4 | 17.0 3.0 | 15.0 0 | 12.9 0 | 11.3 0 | 9.2
28* 21.5 | 25.1 20.5 | 24.7 19.2 | 24.0 18.2 | 23.6 17.0 | 23.0 14.4 | 21.6 10.4 | 20.0 6.0 | 18.0 1.5 | 15.9 0 | 14.3 0 | 12.2
30 23.5 | 27.1 22.5 | 26.7 21.2 | 26.0 20.2 | 25.6 19.0 | 25.0 16.4 | 23.6 12.4 | 22.0 8.0 | 20.0 3.5 | 17.9 0 | 16.3 0 | 14.2
32* 25.5 | 29.1 24.5 | 28.7 23.2 | 28.0 22.2 | 27.6 21.0 | 27.0 18.4 | 25.6 14.4 | 24.0 10.0 | 22.0 5.5 | 19.9 1.5 | 18.3 0 | 16.2
35 x | x x | x 26.2 | 31.0 25.2 | 30.6 24.0 | 30.0 21.4 | 28.6 17.4 | 27.0 13.0 | 25.0 8.5 | 22.9 4.5 | 21.3 0.0 | 19.2
38* x | x x | x 29.2 | 34.0 28.2 | 33.6 27.0 | 33.0 24.4 | 31.6 20.4 | 30.0 16.0 | 28.0 11.5 | 25.9 7.5 | 24.3 3.0 | 22.2
40 x | x x | x 31.2 | 36.0 30.2 | 35.6 29.0 | 35.0 26.4 | 33.6 22.4 | 32.0 18.0 | 30.0 13.5 | 27.9 9.5 | 26.3 5.0 | 24.2
45 x | x x | x x | x x | x 34.0 | 40.0 31.4 | 38.6 27.4 | 37.0 23.0 | 35.0 18.5 | 32.9 14.5 | 31.3 10.0 | 29.2
50 x | x x | x x | x x | x 39.0 | 45.0 36.4 | 43.6 32.4 | 42.0 28.0 | 40.0 23.5 | 37.9 19.5 | 36.3 15.0 | 34.2
55 x | x x | x x | x x | x x | x 41.4 | 48.6 37.4 | 47.0 33.0 | 45.0 28.5 | 42.9 24.5 | 41.3 20.0 | 39.2
60 x | x x | x x | x x | x x | x 46.4 | 53.6 42.4 | 52.0 38.0 | 50.0 33.5 | 47.9 29.5 | 46.3 25.0 | 44.2
65 x | x x | x x | x x | x x | x 51.4 | 58.6 47.4 | 57.0 43.0 | 55.0 38.5 | 52.9 34.5 | 51.3 30.0 | 49.2
70 x | x x | x x | x x | x x | x 56.4 | 63.6 52.4 | 62.0 48.0 | 60.0 43.5 | 57.9 39.5 | 56.3 35.0 | 54.2
75 x | x x | x x | x x | x x | x x | x 57.4 | 67.0 53.0 | 65.0 48.5 | 62.9 44.5 | 61.3 40.0 | 59.2
80 x | x x | x x | x x | x x | x x | x 62.4 | 72.0 58.0 | 70.0 53.5 | 67.9 49.5 | 66.3 45.0 | 64.2
85 x | x x | x x | x x | x x | x x | x 67.4 | 77.0 63.0 | 75.0 58.5 | 72.9 54.5 | 71.3 50.0 | 69.2
90 x | x x | x x | x x | x x | x x | x 72.4 | 82.0 68.0 | 80.0 63.5 | 77.9 59.5 | 76.3 55.0 | 74.2
95* x | x x | x x | x x | x x | x x | x 77.4 | 87.0 73.0 | 85.0 68.5 | 82.9 64.5 | 81.3 60.0 | 79.2
100 x | x x | x x | x x | x x | x x | x 82.4 | 92.0 78.0 | 90.0 73.5 | 87.9 69.5 | 86.3 65.0 | 84.2
105* x | x x | x x | x x | x x | x x | x x | x x | x 78.5 | 92.9 74.5 | 91.3 70.0 | 89.2
110 x | x x | x x | x x | x x | x x | x x | x x | x 83.5 | 97.9 79.5 | 96.3 75.0 | 94.2
115* x | x x | x x | x x | x x | x x | x x | x x | x 88.5 | 102.9 84.5 | 101.3 80.0 | 99.2
120 x | x x | x x | x x | x x | x x | x x | x x | x 93.5 | 107.9 89.5 | 106.3 85.0 | 104.2
125* x | x x | x x | x x | x x | x x | x x | x x | x 98.5 | 112.9 94.5 | 111.3 90.0 | 109.2
130 x | x x | x x | x x | x x | x x | x x | x x | x103.5 | 117.9 99.5 | 116.3 95.0 | 114.2
140 x | x x | x x | x x | x x | x x | x x | x x | x113.5 | 127.9109.5 | 126.3105.0 | 124.2
L(L)M3M3.5M4M4.5M5M6M8M10M12M14M16

M18からM39まで

L(L)M18x2.5M20x2.5M22x2.5M24x3M27x3M30x3.5M33x3.5M36x4M39x4
25 0 | 7.6 x | x x | x x | x x | x x | x x | x x | x x | x
28* 0 | 10.6 0 | 9.0 0 | 7.4 x | x x | x x | x x | x x | x x | x
30 0 | 12.6 0 | 11.0 0 | 9.4 0 | 6.8 x | x x | x x | x x | x x | x
32* 0 | 14.6 0 | 13.0 0 | 11.4 0 | 8.8 x | x x | x x | x x | x x | x
35 0 | 17.6 0 | 16.0 0 | 14.4 0 | 11.8 0 | 9.4 x | x x | x x | x x | x
38* 0 | 20.6 0 | 19.0 0 | 17.4 0 | 14.8 0 | 12.4 x | x x | x x | x x | x
40 1.0 | 22.6 0 | 21.0 0 | 19.4 0 | 16.8 0 | 14.4 0 | 12.0 x | x x | x x | x
45 6.0 | 27.6 2.0 | 26.0 0 | 24.4 0 | 21.8 0 | 19.4 0 | 17.0 0 | 13.6 x | x x | x
50 11.0 | 32.6 7.0 | 31.0 3.0 | 29.4 0 | 26.8 0 | 24.4 0 | 22.0 0 | 18.6 0 | 16.2 0 | 12.8
55 16.0 | 37.6 12.0 | 36.0 8.0 | 34.4 3.0 | 31.8 0 | 29.4 0 | 27.0 0 | 23.6 0 | 21.2 0 | 17.8
60 21.0 | 42.6 17.0 | 41.0 13.0 | 39.4 8.0 | 36.8 2.0 | 34.4 0 | 32.0 0 | 28.6 0 | 26.2 0 | 22.8
65 26.0 | 47.6 22.0 | 46.0 18.0 | 44.4 13.0 | 41.8 7.0 | 39.4 1.0 | 37.0 0 | 33.6 0 | 31.2 0 | 27.8
70 31.0 | 52.6 27.0 | 51.0 23.0 | 49.4 18.0 | 46.8 12.0 | 44.4 6.0 | 42.0 0 | 38.6 0 | 36.2 0 | 32.8
75 36.0 | 57.6 32.0 | 56.0 28.0 | 54.4 23.0 | 51.8 17.0 | 49.4 11.0 | 47.0 4.0 | 43.6 0 | 41.2 0 | 37.8
80 41.0 | 62.6 37.0 | 61.0 33.0 | 59.4 28.0 | 56.8 22.0 | 54.4 16.0 | 52.0 9.0 | 48.6 3.0 | 46.2 0 | 42.8
85 46.0 | 67.6 42.0 | 66.0 38.0 | 64.4 33.0 | 61.8 27.0 | 59.4 21.0 | 57.0 14.0 | 53.6 8.0 | 51.2 1.0 | 47.8
90 51.0 | 72.6 47.0 | 71.0 43.0 | 69.4 38.0 | 66.8 32.0 | 64.4 26.0 | 62.0 19.0 | 58.6 13.0 | 56.2 6.0 | 52.8
95* 56.0 | 77.6 52.0 | 76.0 48.0 | 74.4 43.0 | 71.8 37.0 | 69.4 31.0 | 67.0 24.0 | 63.6 18.0 | 61.2 11.0 | 57.8
100 61.0 | 82.6 57.0 | 81.0 53.0 | 79.4 48.0 | 76.8 42.0 | 74.4 36.0 | 72.0 29.0 | 68.6 23.0 | 66.2 16.0 | 62.8
105* 66.0 | 87.6 62.0 | 86.0 58.0 | 84.4 53.0 | 81.8 47.0 | 79.4 41.0 | 77.0 34.0 | 73.6 28.0 | 71.2 21.0 | 67.8
110 71.0 | 92.6 67.0 | 91.0 63.0 | 89.4 58.0 | 86.8 52.0 | 84.4 46.0 | 82.0 39.0 | 78.6 33.0 | 76.2 26.0 | 72.8
115* 76.0 | 97.6 72.0 | 96.0 68.0 | 94.4 63.0 | 91.8 57.0 | 89.4 51.0 | 87.0 44.0 | 83.6 38.0 | 81.2 31.0 | 77.8
120 81.0 | 102.6 77.0 | 101.0 73.0 | 99.4 68.0 | 96.8 62.0 | 94.4 56.0 | 92.0 49.0 | 88.6 43.0 | 86.2 36.0 | 82.8
125* 86.0 | 107.6 82.0 | 106.0 78.0 | 104.4 73.0 | 101.8 67.0 | 99.4 61.0 | 97.0 54.0 | 93.6 48.0 | 91.2 41.0 | 87.8
130 91.0 | 112.6 87.0 | 111.0 83.0 | 109.4 78.0 | 106.8 72.0 | 104.4 66.0 | 102.0 59.0 | 98.6 53.0 | 96.2 46.0 | 92.8
140101.0 | 122.6 97.0 | 121.0 93.0 | 119.4 88.0 | 116.8 82.0 | 114.4 76.0 | 112.0 69.0 | 108.6 63.0 | 106.2 56.0 | 102.8
150111.0 | 132.6107.0 | 131.0103.0 | 129.4 98.0 | 126.8 92.0 | 124.4 86.0 | 122.0 79.0 | 118.6 73.0 | 116.2 66.0 | 112.8
160121.0 | 142.6117.0 | 141.0113.0 | 139.4108.0 | 136.8102.0 | 134.4 96.0 | 132.0 89.0 | 128.6 83.0 | 126.2 76.0 | 122.8
170131.0 | 152.6127.0 | 151.0123.0 | 149.4118.0 | 146.8112.0 | 144.4106.0 | 142.0 99.0 | 138.6 93.0 | 136.2 86.0 | 132.8
180141.0 | 162.6137.0 | 161.0133.0 | 159.4128.0 | 156.8122.0 | 154.4116.0 | 152.0109.0 | 148.6103.0 | 146.2 96.0 | 142.8
190151.0 | 172.6147.0 | 171.0143.0 | 169.4138.0 | 166.8132.0 | 164.4126.0 | 162.0119.0 | 158.6113.0 | 156.2106.0 | 152.8
200161.0 | 182.6157.0 | 181.0153.0 | 179.4148.0 | 176.8142.0 | 174.4136.0 | 172.0129.0 | 168.6123.0 | 166.2116.0 | 162.8
220 x | x x | x x | x x | x162.0 | 194.4156.0 | 192.0149.0 | 188.6143.0 | 186.2136.0 | 182.8
240 x | x x | x x | x x | x182.0 | 214.4176.0 | 212.0169.0 | 208.6163.0 | 206.2156.0 | 202.8
L(L)M18M20M22M24M27M30M33M36M39

上表は被締結体をボルトとタップ穴のようなめねじで挟んで固定する場合に、ボルトの呼び・長さと、被締結体の厚さの範囲の関係をまとめた表です。

この項では被締結体とボルトの間にみがき丸座金(1970年版、通称ISO大ワッシャー)1枚を挟むときの寸法を示しています。ボルトの長さLは附属書六角ボルトの長さを基準としています。被締結体の厚さの最大値Xmaxは、ボルトの先端がめねじに0.8d(ボルトの呼び径の0.8倍、概ね六角ナットの厚さ)だけ挿入するときの寸法です。最小値Xminは、ボルトの先端がめねじに最大2d(ボルトの呼び径の2倍)まで挿入するときの寸法です。挿入深さが0.8dを越え、2dに達するまでに被締結体の厚さが0となるときは0と表示しています。

上表では各部品の各寸法の公差は考慮していません。参考程度に、六角ボルト(附属書、仕上げ程度上・中)の長さには下表のような許容差が設けられています。座金や被締結体も含めた公差を考慮し、ちょどよい長さのボルトを選びましょう。実際市販されているボルトの長さは、規格表の推奨長さよりも種類が多いことがあります。しかし規格外の長さは常に在庫があるとは限りませんので、よほど特別な理由がなければ推奨長さから選びたいところです。

ボルトのL長さ
mm
呼びM3-M24
L寸法許容差 ±mm
呼びM27-M80
L寸法許容差 ±mm
L <= 500.50.8
30 < L <= 500.71.1
120 < L <= 2500.91.4
250 < L1.21.8

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