技術資料 ユニファイ並目ねじ
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ユニファイ並目ねじの呼びと下穴径 mm
ねじの呼び 下穴径最小
(ひっかかり率)
下穴径最大(%)
3B 2B 1B
No. 1-64 UNC 1.42 (100%) 1.57 (65%) 1.57 (65%)
  2-56 UNC 1.69 (〃) 1.86 (〃) 1.86 (〃)
  3-48 UNC 1.94 (〃) 2.14 (〃) 2.14 (〃)
  4-40 UNC 2.16 (〃) 2.36 (70%) 2.36 (70%)
  5-40 UNC 2.49 (〃) 2.69 (〃) 2.69 (〃)
  6-32 UNC 2.65 (〃) 2.86 (70%) 2.86 (75%)
  8-32 UNC 3.31 (〃) 3.52 (〃) 3.52 (〃)
  10-24 UNC 3.68 (〃) 3.91 (80%) 3.91 (80%)
  12-24 UNC 4.34 (〃) 4.51 (85%) 4.57 (〃)
  1/4-20 UNC 4.98 (〃) 5.25 (80%) 5.25 (〃)
  5/16-18 UNC 6.41 (〃) 6.64 (85%) 6.72 (〃)
  3/8-16 UNC 7.81 (〃) 8.06 (〃) 8.15 (〃)
  7/16-14 UNC 9.15 (〃) 9.40 (〃) 9.50 (〃)
  1/2-13 UNC 10.60 (〃) 10.80 (90%) 11.00 (〃)
  9/16-12 UNC 12.00 (〃) 12.30 (85%) 12.30 (85%)
  5/8-11 UNC 13.40 (〃) 13.60 (90%) 13.80 (〃)
  3/4-10 UNC 16.30 (〃) 16.60 (〃) 16.80 (80%)
  7/8- 9 UNC 19.20 (〃) 19.50 (〃) 19.60 (85%)
  1 - 8 UNC 22.00 (〃) 22.30 (〃) 22.50 (〃)
  1 1/8- 7 UNC 24.60 (〃) 25.00 (〃) 25.20 (〃)
  1 1/4- 7 UNC 27.80 (〃) 28.20 (〃) 28.40 (〃)
  1 3/8 - 6 UNC 30.30 (〃) 30.80 (〃) 31.00 (〃)
  1 1/2- 6 UNC 33.50 (〃) 34.00 (〃) 34.20 (〃)
  1 3/4- 5 UNC 39.00 (〃) 39.50 (〃) 39.80 (〃)
  2 - 4 1/2 UNC 44.70 (〃) 45.30 (〃) 45.30 (90%)


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