※推奨下穴径は、旧JIS2級目ねじ用です。
| メートル並目ねじ | ||
|---|---|---|
| ねじの呼び | 推奨下穴径 | 最小下穴径 |
| M1 X 0.25 | 0.75 | 0.73 |
| M1.1 X 0.25 | 0.85 | 0.83 |
| M1.2 X 0.25 | 0.95 | 0.93 |
| M1.4 X 0.3 | 1.1 | 1.08 |
| M1.6 X 0.35 | 1.25 | 1.23 |
| M1.8 X 0.35 | 1.45 | 1.43 |
| M2 X 0.4 | 1.6 | 1.57 |
| M2.2 X 0.45 | 1.75 | 1.72 |
| M3 X 0.5 | 2.05 | 2.02 |
| M3.5 X 0.6 | 2.5 | 2.46 |
| M4 X 0.7 | 3.3 | 3.25 |
| M4.5 X 0.75 | 3.75 | 3.69 |
| M5 X 0.8 | 4.2 | 4.14 |
| M6 X 1 | 5 | 4.92 |
| M7 X 1 | 6 | 5.92 |
| M8 X 1.25 | 6.75 | 6.65 |
| M9 X 1.25 | 7.75 | 7.65 |
| M10 X 1.5 | 8.5 | 8.38 |
| M11 X 1.5 | 9.5 | 9.38 |
| M12 X 1.75 | 10.25 | 10.11 |
| M14 X 2 | 12 | 11.84 |
| M16 X 2 | 14 | 13.9 |
| M18 X 2.5 | 15.5 | 15.3 |
| M20 X 2.5 | 17.5 | 17.3 |
| M22 X 2.5 | 19.5 | 19.3 |
| M24 X 3 | 21 | 20.8 |
| M27 X 3 | 24 | 23.8 |
| M30 X 2.5 | 26.5 | 26.3 |
| M33 X 3.5 | 29.5 | 29.3 |
| M36 X 4 | 32 | 31.7 |
| M39 X 4 | 35 | 34.7 |
| M42 X 4.5 | 37.5 | 37.2 |
| M45 X 4.5 | 40.5 | 40.2 |
| M48 X 5 | 43 | 42.6 |
| M52 X 5 | 47 | 46.6 |
| M56 X 5.5 | 50.5 | 50.1 |
| M60 X 5.5 | 54.5 | 54.1 |
| M64 X 6 | 58 | 57.6 |
| M68 X 6 | 62 | 61.6 |
※推奨下穴径は、旧JIS2級目ねじ用です。
| メートル細目ねじ | ||
|---|---|---|
| ねじの呼び | 推奨下穴径 | 最小下穴径 |
| M2.5 X 0.35 | 21.5 | 2.13 |
| M3 X 0.35 | 2.65 | 2.63 |
| M3.5 X 0.35 | 3.15 | 3.13 |
| M4 X 0.75 | 3.25 | 3.19 |
| M4 X 0.5 | 3.5 | 3.46 |
| M4.5 X 0.5 | 4 | 3.96 |
| M5 X 0.5 | 4.5 | 4.46 |
| M6 X 0.75 | 5.25 | 5.19 |
| M7 X 0.75 | 6.25 | 6.19 |
| M8 X 1 | 7 | 6.92 |
| M8 X 0.75 | 7.25 | 7.19 |
| M9 X 1 | 8 | 7.92 |
| M9 X 0.75 | 8.25 | 8.19 |
| M10 X 1.25 | 8.75 | 8.65 |
| M10 X 1 | 9 | 8.92 |
| M10 X 0.75 | 9.25 | 9.19 |
| M11 X 1.25 | 9.75 | 9.65 |
| M11 X 1 | 10 | 9.92 |
| M11 X 0.75 | 10.25 | 10.19 |
| M12 X 1.5 | 10.5 | 10.38 |
| M12 X 1.25 | 10.75 | 10.65 |
| M12 X 1 | 11 | 10.92 |
| M14 X 1.5 | 12.5 | 12.38 |
| M14 X 1.25 | 12.75 | 12.65 |
| M14 X 1 | 13 | 12.92 |
| M15 X 1.5 | 13.5 | 13.4 |
| M15 X 1.25 | 13.8 | 13.7 |
| M15 X 1 | 14 | 13.95 |
| M16 X 1.5 | 14.5 | 14.4 |
| M16 X 1 | 15 | 14.95 |
| M16 X 0.5 | 15.5 | 15.46 |
| M17 X 1.5 | 15.5 | 15.4 |
| M17 X 1 | 16 | 15.95 |
| M18 X 2 | 16 | 15.9 |
| M18 X 1.5 | 16.5 | 16.4 |
| M18 X 1 | 17 | 16.95 |
| M18 X 0.5 | 17.5 | 17.46 |
| M20 X 2 | 18 | 17.9 |
| M20 X 1.5 | 18.5 | 18.4 |
| M20 X 1 | 19 | 18.95 |
| M20 X 0.5 | 19.5 | 19.46 |
| M22 X 2 | 20 | 19.9 |
| M22 X 1.5 | 20.5 | 20.4 |
| M22 X 1 | 21 | 20.95 |
| M22 X 0.5 | 21.5 | 21.46 |
| M24 X 2 | 22 | 21.9 |
| M24 X 1.5 | 22.5 | 22.4 |
| M24 X 1 | 23 | 22.95 |
| M25 X 2 | 23 | 22.9 |
| M25 X 1.5 | 23.5 | 23.4 |
| M25 X 1 | 24 | 23.95 |
| M26 X 1.5 | 24.5 | 24.4 |
| M26 X 1 | 25 | 24.95 |
| M27 X 2 | 25 | 24.9 |
| M27 X 1.5 | 25.5 | 25.4 |
| M27 X 1 | 26 | 25.95 |
| M28 X 2 | 26 | 25.9 |
| M28 X 1.5 | 26.5 | 26.4 |
| M28 X 1 | 27 | 26.95 |
| M30 X 3 | 27 | 26.8 |
| M30 X 2 | 28 | 27.9 |
| M30 X 1.5 | 28.5 | 28.4 |
| M30 X 1 | 29 | 28.95 |
| M32 X 2 | 30 | 29.9 |
| M32 X 1.5 | 30.5 | 30.4 |
| M32 X 1 | 31 | 30.95 |
| M33 X 3 | 30 | 29.8 |
| M33 X 2 | 31 | 30.9 |
| M33 X 1.5 | 31.5 | 31.4 |
| M35 X 1.5 | 33.5 | 33.4 |
| M36 X 3 | 33 | 32.8 |
| M36 X 2 | 34 | 33.9 |
| M36 X 1.5 | 34.5 | 34.4 |
| M38 X 1.5 | 36.5 | 36.4 |
| M38 X 1 | 37 | 36.95 |
| M39 X 3 | 36 | 35.8 |
| M39 X 2 | 37 | 36.9 |
| M39 X 1.5 | 37.5 | 37.4 |
| M40 X 3 | 37 | 36.8 |
| M40 X 2 | 38 | 37.9 |
| M40 X 1.5 | 38.5 | 38.4 |
| M42 X 4 | 38 | 37.7 |
| M42 X 3 | 39 | 38.8 |
| M42 X 2 | 40 | 39.9 |
| M42 X 1.5 | 40.5 | 40.4 |
| M42 X 1 | 41 | 40.95 |
| M45 X 4 | 41 | 40.7 |
| M45 X 3 | 42 | 41.8 |
| M45 X 2 | 43 | 42.9 |
| M45 X 1.5 | 43.5 | 43.4 |
| M48 X 4 | 44 | 43.7 |
| M48 X 3 | 45 | 44.8 |
| M48 X 2 | 46 | 45.9 |
| M48 X 1.5 | 46.5 | 46.4 |
| M50 X 3 | 47 | 46.8 |
| M50 X 2 | 48 | 47.9 |
| M50 X 1.5 | 48.5 | 48.4 |
| M52 X 4 | 48 | 47.7 |
| M52 X 3 | 49 | 48.8 |
| M52 X 2 | 50 | 49.9 |
| M52 X 1.5 | 50.5 | 50.4 |
| M55 X 4 | 51 | 50.7 |
| M55 X 3 | 52 | 51.8 |
| M55 X 2 | 52 | 51.9 |
| M55 X 1.5 | 53.5 | 53.4 |
| M56 X 4 | 52 | 51.7 |
| M56 X 3 | 53 | 52.8 |
| M56 X 2 | 54 | 53.9 |
| M56 X 1.5 | 54.5 | 54.4 |
| M58 X 4 | 54 | 53.7 |
| M58 X 3 | 55 | 54.8 |
| M58 X 2 | 56 | 55.9 |
| M58 X 1.5 | 56.5 | 56.4 |
| M60 X 4 | 56 | 55.7 |
| M60 X 3 | 57 | 56.8 |
| M60 X 2 | 58 | 57.9 |
| M60 X 1.5 | 58.5 | 58.4 |
| M62 X 4 | 58 | 57.7 |
| M62 X 3 | 59 | 58.8 |
| M62 X 2 | 60 | 59.9 |
| M62 X 1.5 | 60.5 | 60.4 |
| M64 X 4 | 60 | 59.7 |
| M64 X 3 | 61 | 60.8 |
| M64 X 2 | 62 | 61.9 |
| M64 X 1.5 | 62.5 | 62.4 |
| M65 X 4 | 61 | 60.7 |
| M65 X 3 | 62 | 61.8 |
| M65 X 2 | 63 | 62.9 |
| M65 X 1.5 | 63.5 | 63.4 |
| M68 X 4 | 64 | 63.7 |
| M68 X 3 | 65 | 64.8 |
| M68 X 2 | 66 | 65.9 |
| M68 X 1.5 | 66.5 | 66.4 |
| ユニファイねじ | |||
|---|---|---|---|
| ねじの呼び | 推奨下穴径 | 最小下穴径 | 最大下穴径 |
| No.0 – 80UNF | 1.25 | 1.19 | 1.3 |
| No.1 – 64UNC | 1.5 | 1.43 | 1.57 |
| No.1 – 72UNF | 1.55 | 1.48 | 1.61 |
| No.2 – 56UNC | 1.79 | 1.7 | 1.87 |
| No.2 – 64UNF | 1.84 | 1.76 | 1.91 |
| No.3 – 48UNC | 2.05 | 1.95 | 2.14 |
| No.3 – 56UNF | 2.11 | 2.03 | 2.19 |
| No.4 – 40UNC | 2.27 | 2.16 | 2.38 |
| No.4 – 48UNF | 2.37 | 2.28 | 2.45 |
| No.5 – 40UNC | 2.59 | 2.49 | 2.69 |
| No.5 – 44UNF | 2.65 | 2.56 | 2.74 |
| No.6 – 32UNC | 2.77 | 2.65 | 2.89 |
| No.6 – 40UNF | 2.92 | 2.82 | 3.02 |
| No.8 – 32UNC | 3.42 | 3.31 | 3.53 |
| No.8 – 36UNF | 3.51 | 3.41 | 3.6 |
| No.10 – 24UNC | 3.81 | 3.69 | 3.93 |
| No.10 – 32UNF | 4.07 | 3.97 | 4.16 |
| No.12 – 24UNC | 4.47 | 4.35 | 4.59 |
| No.12 – 28UNF | 4.61 | 4.5 | 4.72 |
| 1/4 – 20UNC | 5.12 | 4.98 | 5.25 |
| 1/4 – 28UNF | 5.47 | 5.36 | 5.58 |
| 5/16 – 18UNC | 6.57 | 6.41 | 6.73 |
| 5/16 – 24UNF | 6.91 | 6.79 | 7.03 |
| 3/8 – 16UNC | 7.98 | 7.8 | 8.15 |
| 3/8 – 24UNF | 8.51 | 8.39 | 8.63 |
| 7/16 – 14UNC | 9.35 | 9.15 | 9.55 |
| 7/16 – 20UNF | 9.38 | 9.73 | 10.03 |
| 1/2 – 13UNC | 10.81 | 10.6 | 11.02 |
| 1/2 – 20UNF | 11.47 | 11.33 | 11.6 |
| 9/16 – 12UNC | 12.2 | 12 | 12.4 |
| 9/16 – 18UNF | 12.9 | 12.8 | 13 |
| 5/8 – 11UNC | 13.6 | 13.4 | 13.8 |
| 5/8 – 18UNF | 14.5 | 14.4 | 14.6 |
| 3/4 – 10UNC | 16.6 | 16.4 | 16.8 |
| 3/4 – 16UNF | 17.5 | 17.4 | 17.6 |
| 7/8 – 9UNC | 19.5 | 19.2 | 19.7 |
| 7/8 – 14UNF | 20.5 | 20.3 | 20.6 |
| 1 – 8UNC | 22.3 | 22 | 22.4 |
| 1 – 12UNF | 23.4 | 23.2 | 23.5 |
| 1 1/8 – 8UNC | 25 | 24.7 | 25.3 |
| 1 1/8 – 12UNF | 26.5 | 26.3 | 26.7 |
| 1 1/4 – 7UNC | 28.2 | 27.9 | 28.5 |
| 1 1/4 – 12UNF | 29.7 | 29.5 | 29.9 |
| 1 3/8 – 6UNC | 30.8 | 30.4 | 31.1 |
| 1 3/8 – 12UNF | 32.9 | 32.7 | 33 |
| 1 1/2 – 6UNC | 33.9 | 33.6 | 34.2 |
| 1 1/2 – 12UNF | 36.1 | 35.9 | 36.2 |
| 1 3/4 – 5UNC | 39.4 | 39 | 39.8 |
| 2 – 4.5UNC | 45.1 | 44.7 | 45.5 |
| 2 1/4 – 4.5UNC | 51.5 | 51.1 | 51.9 |
| 2 1/2 – 4UNC | 57.1 | 56.7 | 57.5 |
| 2 3/4 – 4UNC | 63.5 | 63 | 63.9 |
| 3 – 4UNC | 69.8 | 69.4 | 70.2 |
| 3 1/4 – 4UNC | 76.2 | 75.7 | 76.6 |
| 3 1/2 – 4UNC | 82.5 | 82.1 | 82.9 |
| 3 3/4 – 4UNC | 88.9 | 88.4 | 89.3 |