268 TECHNICAL INFORMATION S e Ødf Ødp t d t t ℓ 90° (1) or120° Approx.45°(2) Drill Bottom Round Bottom The inlet of hexagon socket may be rounded or chamfered Bottom of Cone Incomplete Threaded Portion (2P or Less) Note (3): when e min.=1.14×s(min.) Excluding nominal of thread M25 or less for screws. (4): The values in Column 1 for t min. are applicable to the nominal lengths ( ℓ ) shorter than values indicated with the dotted border, and the values in Column 2 to the nominal lengths beyond the border. (5): Min.rand max. are based on JIS B 1021. They are rounded to the first digit below zero. Reference 1. Recommended nominal lengths ( ℓ ) for individual nominal of thread are enclosed with thick lines. If the required ℓ-value is not given in the table, it should be specified by the ordering side. 2. The shape and dimensions of the flat end of the screw are based on JIS B 1003 (shape and dimensions of the end of the screw). 3. The shape of the hexagon socket bottom may be a conical, drill or round bottom. The shape and dimensions indicated in the reference table are based on ISO 4026-1977. 1. Shape and Dimension of Hexagon Socket Set Screws and Its Flat End (JIS B 1177-1997) Note (1): Should be chamfered to 120˚ if ℓ is shorter than values indicated with dotted line in a stair case pattern (2): 45˚ is applied to the slanted portion below the trough diameter line of the male thread. Nominal of Thread(d) M2 M3 M4 M5 M6 M8 M10 M12 M16 M20 M24 Pitch(P) 0.4 0.5 0.7 0.8 1.0 1.25 1.5 1.75 2.0 2.5 3.0 dp Max.(Reference Dimension) 1.0 2.0 2.5 3.5 4.0 5.5 7.0 8.5 12.0 15.0 18.0 Min. 0.75 1.75 2.25 3.2 3.7 5.2 6.64 8.14 11.57 14.57 17.57 df Approx. Thread Bottom Diameter of Male Thread e Min.(3) 1.003 1.73 2.30 2.87 3.44 4.58 5.72 6.86 9.15 11.43 13.72 s Nominal(Reference Dimension) 0.9 1.5 2.0 2.5 3.0 4.0 5.0 6.0 8.0 10.0 12.0 Max. 0.902 1.545 2.045 2.560 3.080 4.095 5.095 6.095 8.115 10.115 12.142 Min. 0.889 1.520 2.020 2.520 3.020 4.020 5.020 6.020 8.025 10.025 12.032 t Min.(4) Column 1 0.8 1.2 1.5 2.0 2.0 3.0 4.0 4.8 6.4 8.0 10.0 Column 2 1.7 2.0 2.5 3.0 3.5 5.0 6.0 8.0 10.0 12.0 15.0 ℓ(5) Approx. Mass Per 1000 Units Unit:kg (Density:7.85kg/dm3) Nominal Length (Reference Dimension) Min. Max. 2 1.8 2.2 0.029 0.059 2.5 2.3 2.7 0.037 0.08 0.099 3 2.8 3.2 0.044 0.1 0.14 0.2 4 3.7 4.3 0.059 0.14 0.22 0.32 0.41 5 4.7 5.3 0.074 0.18 0.3 0.44 0.585 0.945 6 5.7 6.3 0.089 0.22 0.38 0.56 0.76 1.26 1.77 8 7.7 8.3 0.119 0.3 0.54 0.8 1.11 1.89 2.78 4 10 9.7 10.3 0.148 0.38 0.7 1.04 1.46 2.52 3.78 5.4 8.5 12 11.6 12.4 0.46 0.86 1.28 1.81 3.15 4.78 6.8 11.1 15.8 16 15.6 16.4 0.62 1.18 1.76 2.51 4.41 6.78 9.6 16.3 24.1 30 20 19.6 20.4 1.49 2.24 3.21 5.67 8.76 12.4 21.5 32.3 42 25 24.6 25.4 2.84 4.09 7.25 11.2 15.9 28 42.6 57 30 29.6 30.4 4.97 8.82 13.7 19.4 34.6 52.9 72 35 34.5 35.5 10.4 16.2 22.9 41.1 63.2 87 40 39.5 40.5 12 18.7 26.4 47.7 73.5 102 45 44.5 45.5 21.2 29.9 54.2 83.8 117 50 49.5 50.5 23.7 33.4 60.7 94.1 132 55 54.4 55.6 36.8 67.3 104 147 60 59.4 60.6 40.3 73.7 115 162 GeneralTechnical Information Hexagon Socket Set Screws FlatType
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