技術資料 ユニファイ細目ねじ
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ユニファイ細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. 0-80 UNF 1.18 (100%) 1.30 (65%) 1.30 (65%)
  1-72 UNF 1.47 (〃) 1.61 (〃) 1.61 (〃)
  2-64 UNF 1.75 (〃) 1.90 (〃) 1.90 (〃)
  3-56 UNF 2.02 (〃) 2.17 (70%) 2.17 (70%)
  4-48 UNF 2.27 (〃) 2.44 (〃) 2.44 (〃)
  5-44 UNF 2.55 (〃) 2.74 (〃) 2.74 (〃)
  6-40 UNF 2.82 (〃) 2.99 (75%) 3.02 (〃)
  8-36 UNF 3.40 (〃) 3.59 (〃) 3.59 (75%)
  10-32 UNF 3.97 (〃) 4.14 (80%) 4.14 (80%)
  12-28 UNF 4.50 (〃) 4.70 (〃) 4.70 (〃)
  1/4-28 UNF 5.37 (〃) 5.56 (〃) 5.56 (〃)
  5/16-24 UNF 6.79 (〃) 6.96 (85%) 7.02 (〃)
  3/8-24 UNF 8.38 (〃) 8.55 (〃) 8.61 (〃)
  7/16-20 UNF 9.74 (〃) 9.94 (〃) 10.01 (〃)
  1/2-20 UNF 11.33 (〃) 11.46 (90%) 11.60 (〃)
  9/16-18 UNF 12.76 (〃) 12.91 (〃) 13.07 (〃)
  5/8-18 UNF 14.35 (〃) 14.50 (〃) 14.65 (〃)
  3/4-16 UNF 17.33 (〃) 17.50 (〃) 17.59 (85%)
  7/8-14 UNF 20.30 (〃) 20.40 (95%) 20.60 (〃)
  1 -12 UNF 23.10 (〃) 23.30 (90%) 23.50 (〃)
  1 1/8-12 UNF 26.30 (〃) 26.50 (〃) 26.70 (80%)
  1 1/4-12 UNF 29.50 (〃) 29.70 (〃) 29.90 (〃)
  1 3/8-12 UNF 32.60 (〃) 32.70 (95%) 33.00 (85%)
  1 1/2-12 UNF 35.80 (〃) 36.00 (90%) 36.20 (〃)


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