284 Acme St andard Screw Thread Gage HARDENED 29º ThisgageisastandardforgrindingandsettingtoolswhencuttingAcme threads.Acme threads have the same depth as square threads but the sides of the threads are at an inclination of 14-1/2º (29º included angle).This form of thread is used extensively and has in many instances replaced the square thread in machine construction.The advantages of theAcme thread are its strength and the ease by which it can be cut compared with square threads.The angles and edges of this gage are hardened,ground and carefully tested. In use, the angle on the thread cutting tool is checked on the large precision-ground V at the end of the gage.The tool is then ground on the end to the width of the slot of whatever pitch is being turned. It is then set in the lathe using the half angle. St andards for Sheet and Wire Gages with Corresponding St arrett Gages Dimensions of Sizes in Decimal Parts of an Inch No. of Wire Gage 281 188 and 245 287 280 Stubs' Steel Wire 283 American or Brown & Sharpe Birmingham or Stubs' Iron Wire Washburn & Moen, Worcester, MA* American S. & W. Co's. Music Wire Gage U.S. Standard Gage for Sheet and Plate Iron and Steel 00000000 0.7314 0000000 0.6514 000000 0.5800 0.004 0.4688 00000 0.5165 0.005 0.4375 0000 0.46 0.454 0.3938 0.006 0.4063 000 0.4096 0.425 0.3625 0.007 0.375 00 0.3648 0.38 0.331 0.008 0.3438 0 0.3249 0.34 0.3065 0.009 0.3125 1 0.2893 0.3 0.283 0.01 0.227 0.2813 2 0.2576 0.284 0.2625 0.011 0.219 0.2656 3 0.2294 0.259 0.2437 0.012 0.212 0.25 4 0.2043 0.238 0.2253 0.013 0.207 0.2344 5 0.1819 0.22 0.207 0.014 0.204 0.2188 6 0.1620 0.203 0.192 0.016 0.201 0.2031 7 0.1443 0.18 0.177 0.018 0.199 0.1875 8 0.1285 0.165 0.162 0.02 0.197 0.1719 9 0.1144 0.148 0.1483 0.022 0.194 0.1563 10 0.1019 0.134 0.135 0.024 0.191 0.1406 11 0.0907 0.12 0.1205 0.026 0.188 0.125 12 0.0808 0.109 0.1055 0.029 0.185 0.1094 13 0.0720 0.095 0.0915 0.031 0.182 0.0938 14 0.0641 0.083 0.08 0.033 0.18 0.0781 15 0.0571 0.072 0.072 0.035 0.178 0.0703 16 0.0508 0.065 0.0625 0.037 0.175 0.0625 17 0.0453 0.058 0.054 0.039 0.172 0.0563 18 0.0403 0.049 0.0475 0.041 0.168 0.05 19 0.0359 0.042 0.041 0.043 0.164 0.0438 20 0.0320 0.035 0.0348 0.045 0.161 0.0375 21 0.0285 0.032 0.0318 0.047 0.157 0.0344 22 0.0253 0.028 0.0286 0.049 0.155 0.0313 23 0.0226 0.025 0.0258 0.051 0.153 0.0281 24 0.0201 0.022 0.023 0.055 0.151 0.025 25 0.0179 0.02 0.0204 0.059 0.148 0.0219 26 0.0159 0.018 0.0181 0.063 0.146 0.0188 27 0.0142 0.016 0.0173 0.067 0.143 0.0172 28 0.0126 0.014 0.0162 0.071 0.139 0.0156 29 0.0113 0.013 0.015 0.075 0.134 0.0141 30 0.0100 0.012 0.014 0.08 0.127 0.0125 31 0.0089 0.01 0.0132 0.085 0.12 0.0109 32 0.0080 0.009 0.0128 0.09 0.115 0.0102 33 0.0071 0.008 0.0118 0.095 0.112 0.0094 34 0.0063 0.007 0.0104 0.11 0.0086 35 0.0056 0.005 0.0095 0.108 0.0078 36 0.005 0.004 0.009 0.106 0.0070 37 0.0045 0.103 0.0066 38 0.0040 0.101 0.0063 39 0.0035 0.099 40 0.0031 0.097 * Also called the U.S. Steel Wire Gage 284 Fixed Gages Cat. No. EDP Description 284 51319 Acme Standard Screw Thread Gage 329 starrett.com F ixed G age S t andards