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1、精度選定SNT 依母螺紋之等級(1、2、3級等)決定螺絲攻之精度表1. 公制螺紋(M) 表2. 美制螺紋(U)規 格牙距螺 絲 攻 精 度規 格牙數螺 絲 攻 精 度1級母螺紋2級母螺紋1級母螺紋2級母螺紋M3 M4 M4.5 M5 M5.50.5GH3GH4GH5GH6No.544GH3GH4GH5GH6M3 M3.50.35GH3GH4GH5GH6No.5 No.640GH3GH4GH5GH6M3.50.6GH3GH4GH5GH6No.836GH4GH5GH6M40.7GH4GH5GH6GH7No.6 No.8 No.10 32GH4GH5GH6M50.8GH4GH5GH6GH7No.10
2、 No.1224GH4GH5GH6M61GH4GH5GH6GH7No.1228GH4GH5GH6M4 M4.5 M60.75GH4GH5GH6GH7U 1/420GH4GH5GH6GH7M7 M8 M91GH4GH5GH6GH728GH4GH5GH6M10 M110.75GH4GH5GH6GH7U 5/1618GH5GH6GH7GH8M10 M11 M121GH4GH6GH7GH824GH5GH6GH7M8 M9 M10 M121.25GH5GH6GH7GH8U 3/816GH5GH6GH7GH8M10 M11 M121.5GH5GH6GH7GH824GH5GH6GH7M121.75GH5GH
3、7GH8GH9U 7/1614GH5GH6GH7GH8M14 M15 M161GH5GH6GH7GH820GH5GH6GH7GH8M17 M18 M20 M22 M24 1GH5GH6GH7GH8U 1/213GH6GH7GH8GH9M14 M15 M161.5GH5GH7GH8GH920GH5GH6GH7GH8M18 M20 M22 M24 1.5GH6GH7GH8GH9U 9/1612GH6GH7GH8GH9M14 M162GH6GH7GH8GH918GH6GH7GH8GH9M171.5GH6GH8GH9GH10U 5/811GH7GH8GH9GH10M18 M20 M22 2GH6GH8
4、GH9GH1018GH6GH7GH8GH9M18 M20 M22 2.5GH6GH8GH9GH10U 3/410GH7GH8GH9GH10M242GH6GH8GH9GH1016GH6GH7GH8GH9M243GH6GH8GH9GH10U 7/89GH7GH8GH9GH1014GH6GH7GH8GH9U 18GH8GH9GH10GH1112GH7GH8GH9GH10表3. 英制螺紋(W)規 格牙數螺 絲 攻 精 度備註:(1)各等級之文字大者為參考用標準精度，視加工材及作業條件之適用情況，可選擇前後項的精度而變更之。 (2)表1.2.3確定之絲攻精度其公差12.7um(0.0005)的階段狀公差
5、。 GH6時為12.76=77um為上限容許差，下限容許差則為77-12.7(13)=64um1級母螺紋2級母螺紋W 1/8 44GH3GH4GH5GH6W 5/3240GH3GH4GH5GH6W 3/2436GH4GH5GH6W 1/420GH4GH5GH6GH7W 5/1618GH5GH6GH7GH8W 3/816GH5GH6GH7GH8W 7/1614GH5GH6GH7GH8W 1/212GH6GH7GH8GH9W 9/1612GH6GH7GH8GH9W 5/811GH7GH8GH9GH10W 3/410GH7GH8GH9GH10W 7/89GH7GH8GH9GH10W 18GH8GH9
6、GH10GH112.加工材攻牙速度與攻牙油選定基準螺 帽 種 類切削速度 m/min切削油劑切削速度計算式：螺帽冷間成型軟材2535 V = D N硬材20301000螺帽熱間成型軟材2535不水溶性切削油硬材2030V：切削速度(m/min) 螺帽經熱處理調質2530HRC2535D：TAP外徑(mm)3036HRC1020N：迴轉速(r.p.m)不 銹 鋼 螺 帽15253.螺帽絲攻形狀 M7(U1/4)以下 M8(U5/16)以上表1.公制普通牙 表2.公制細牙規 格A(全長)B(牙長)C(柄徑)刃數規 格A(全長)B(牙長)C(柄徑)刃數25山30山(SUS)25山30山(SUS)M3
7、 0.558.712.5152.33M4 0.558.112.51533M3.5 0.658.515182.33M5 0.562.612.51543M4 0.758.317.52133M6 0.7567.218.822.54.53M4.5 0.755818.822.53.53M7 0.757018.822.55.53M5 0.862.820243.83M8 0.757618.822.56.55M6 167.425304.63M9 0.758918.822.57.55M7 17025305.63M8 17725306.65M8 1.257731.337.565M9 18925307.65M9 1
8、.258931.337.575M10 18925308.65M10 1.58937.54585M10 1.258931.337.585M11 1.510237.5458.85M12 1.2510231.337.5105M12 1.7510243.852.59.55M14 1.2511431.337.5125M14 2114506011.25M12 1.510237.5459.55M16 2127506013.15M14 1.511437.54511.25M18 2.513362.575145M16 1.512737.54513.15M20 2.513362.57516.55M18 1.5133
9、37.545155M22 2.514662.57517.55M20 1.513337.54516.55M24 3165759018.55M22 1.514637.545195M27 3165759021.55M24 1.516537.54521.55M18 21335060155表3.美制普通牙M20 2133506016.55M22 21465060195規 格A(全長)B(牙長)C(柄徑)刃數M24 2165506020525山30山(SUS)No. 4-40UNC58.815.919.123表4.美制細牙No. 5-40UNC58.715.919.12.23No. 6-32UNC58.619.823.82.43規 格A(全長)B(牙長)C(柄徑)刃數No. 8-32UNC58.21
