（Reference）Counterbore hole / screw hole dimensions for socket head cap screwsUnit：mmNominal diameter（d）M3M4M5M6M8M10M12M14M16M20M24dhds（Reference）3D6.5dk（Reference）5.5H3.3k（Reference）3 lacnhceTDH ）k（iL（14）ataDs・tcudorP （15）Avoid using （M14）（dk）（ds）dh Unit：mmNominal lengthTable for socket head cap screwM3M4M5M6Incomplete threaded screw Ls min. and Lg max.LsLgMax.Min.LgMax.LsMin.LgMax.LsMin.LgMax.11.515 913 61116.52014181116 5.75121923162110.75175.5132428212615.752210.518263120.752715.52310.2519313625.753220.52815.252410203.430.753725.53320.252915 25 11 2135.754230.53825.253420 30 16 2645.755240.54835.254430 40 26 3615.5 2850.55845.255440 50 36 4625.5 38 15 3060.56855.256450 60 46 5635.5 48 25 4065.257460 70 56 6645.5 58 35 5075.258470 80 66 7655.5 68 45 6080 90 76 8665.5 78 55 7090100 86 9675.5 88 65 80 9610685.5 98 75 9010611695.5108 85100115.5128105120135.5148125140 6.6 61110 6.5 6 9 81413 8.6 8111017.51610.8105.559.58.55.454.54874.44M8M10M12（M14）（15）M16LsMin.LsMin.LsMin.LgMax.LgMax.LgMax.LgMax.13.5122018131215.514232115.21417.516262417.5162220323021.520M20LsMin.LsMin.LgMax.LsMin.LgMax.M24LsMin.LgMax.2624393625.5241133Nominal diameter（d）LsMin.Min.Max. 4.76 5.24 5.76 6.24 7.71 8.29 9.71 10.29 11.65 12.35 15.65 16.35 19.58 20.42 24.58 25.424.5 7 29.58 30.429.512 6.510 4 8 34.5 39.5 44.5 49.5 54.4 59.4 64.4 69.4 79.4 89.3 99.3109.3119.3129.2139.2149.2159.2179.2199.075200.925 5 6 810121620253035404550556065708090100110120130140150160180200 （14）（■■）is for commonly used nominal length, ■ is for full-threaded screw, incomplete threaded portion should be within 3P. 35.5 40.5 45.5 50.5 55.6 60.6 65.6 70.6 80.6 90.7100.7110.7120.7130.8140.8150.8160.8180.8
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