INTERNAL UN 60°~ 1.5 x D INTERNAL UN 60°~ 2 x D2 INTERNAL METRIC 60°~ 1.5 x D2 INTERNAL METRIC 60°~ 2 x D2 NPT External / Internal NPTF External / Internal WHITWORTH External / Internal BSP (G) External / Internal BSPT External / Internal SOLID CARBIDE THREAD MILLS WITH COOLANT THRU HOLE HELICOOL FOR THREADS TPI D2 L1 L D MIN BORE PART #: VAR- UNC UNF UNEF #10-32 #12 to 3/8”-32 32 .150 .391 1.772 3/16 .157 80291 #12 to 3/8”-32 32 .173 .453 2.244 1/4 .185 80292 #12; 1/4”-28 7/16”; 1/2”-28 28 .169 .446 2.244 1/4 .181 80293 1/4”-28 7/16”; 1/2”-28 28 .203 .518 2.244 1/4 .216 80294 7/16”; 1/2”-28 28 .371 .875 2.874 3/8 .401 80295 #10-24 5/16”; 3/8”-24 9/16” to 11/16”-24 24 .141 .396 1.772 3/16 .150 80296 #12-24 5/16”; 3/8”-24 9/16” to 11/16”-24 24 .163 .437 2.244 1/4 .177 80297 5/16”; 3/8”-24 9/16” to 11/16”-24 24 .263 .646 2.402 5/16 .272 80298 3/8”-24 9/16” to 11/16”-24 24 .323 .771 2.874 3/8 .335 80299 9/16” to 11/16”-24 24 .496 1.145 3.150 1/2 .520 80300 1/4”-20 7/16”; 1/2”-20 3/4” to 1”-20 20 .192 .525 2.244 1/4 .201 80301 7/16”; 1/2”-20 3/4” to 1”-20 20 .362 .875 2.874 3/8 .390 80302 1/2”-20 3/4” to 1”-20 20 .437 1.025 3.150 1/2 .453 80303 3/4” to 1”-20 20 .685 1.525 4.016 3/4 .701 80304 5/16”-18 9/16”; 5/8”-18 11/16” to 1.11/16”-18 18 .242 .639 2.402 5/16 .260 80305 9/16”; 5/8”-18 11/16” to 1.11/16”-18 18 .492 1.139 3.150 1/2 .512 80306 5/8”-18 11/16” to 1.11/16”-18 18 .555 1.250 3.622 5/8 .575 80307 3/8”-16 3/4”-16 16 .301 .781 2.402 5/16 .315 80308 3/4”-16 16 .669 1.528 4.016 3/4 .689 80309 7/16”-14 7/8”-14 14 .354 .893 2.874 3/8 .370 80310 7/8”-14 14 .746 1.750 4.016 3/4 .807 80311 1/2”-13 13 .407 1.039 3.150 1/2 .430 80312 9/16”-12 1” to 1.1/2”-12 12 .465 1.125 3.150 1/2 .484 80313 1” to 1.1/2”-12 12 .746 2.042 4.016 3/4 .925 80314 5/8”-11 11 .516 1.318 3.622 5/8 .539 80315 3/4”-10 10 .622 1.550 3.622 5/8 .657 80316 7/8”-9 9 .746 1.833 4.016 3/4 .768 80317 1”-8 8 .746 2.063 4.016 3/4 .866 80318 FOR THREADS PITCH MM D2 L1 L D MIN BORE PART #: VAR- M COARSE M FINE M3x0.5 M3.5 to M16x0.5 0.5 .094 .187 1.772 3/16 .098 80337 M4x0.7 0.7 .124 .262 1.772 3/16 .129 80355 M5x0.8 0.8 .159 .299 2.244 3/16 .165 80356 M6x1.0 M8 to M40x1.0 1.0 .189 374 2.244 1/4 .197 80343 M8x1.25 1.25 .256 .524 2.402 5/16 .268 80357 M10x1.5 M12 to M48x1.5 1.5 .323 .620 2.874 3/8 .335 80346 M12x1.75 1.75 .370 .724 2.874 3/8 .405 80358 M14x2.0 M17 to M80x2.0 2.0 .457 .827 2.874 1/2 .472 80351 M16x2.0 M17 to M80x2.0 2.0 .535 .984 3.622 5/8 .551 80353 THREAD SIZE TPI D2 L1 L D BORE DIA PART #: VAR- 1/16”-27 27 .232 .389 2.244 1/4 .244 80321 1/8”-27 27 .301 .389 2.402 5/16 .330 80322 1/4”-18 18 .370 .583 2.874 3/8 .437 80323 3/8”-18 18 .439 .583 2.874 1/2 .562 80324 1/2”, 3/4”-14 14 .561 .750 3.150 5/8 .704, .905 80325 1”, 1.1/4”, 1.1/2”, 2”-11.5 11.5 .746 .913 4.016 3/4 1.411, 1.484, 1.732, 2.204 80326 2.1/2”-8, 3”-8 8 .746 1.313 4.016 3/4 2.625, 3.232 80327 FOR THREADS PITCH MM D2 L1 L D MIN BORE PART #: VAR- M COARSE M FINE M3x0.5 M3.5 to M16x0.5 0.5 .094 .246 1.772 3/16 .098 80336 M4x0.5 0.5 .126 .325 1.772 3/16 .138 80338 M5x0.5 0.5 .165 .404 2.244 1/4 .177 80339 M4x0.7 0.7 .124 .344 1.772 3/16 .129 80284 M6x0.75 0.75 .197 .487 2.244 1/4 .209 80340 M5x0.8 0.8 .159 .425 2.244 3/16 .165 80341 M6x1.0 M8 to M40x1.0 1.0 .189 .492 2.244 1/4 .197 80342 M8x1.0 1.0 .264 .650 2.402 5/16 .276 80344 M10x1.0 1.0 .343 .807 2.874 3/8 .354 80285 M12x1.0 1.0 .421 .965 2.874 1/2 .433 80286 M8x1.25 1.25 .256 .664 2.402 5/16 .268 80287 M10x1.25 1.25 .335 .812 2.874 3/8 .346 80345 M10x1.5 M12 to M48x1.5 1.5 .323 .797 2.874 3/8 .335 80288 M12x1.5 1.5 .370 .974 2.874 3/8 .413 80347 M14x1.5 1.5 .469 1.152 3.150 1/2 .492 80348 M16x1.5 1.5 .547 1.270 3.150 5/8 .571 80349 M12x1.75 1.75 .370 .999 2.874 3/8 .405 80350 M14x2.0 M17 to M80x2.0 2.0 .457 1.142 3.150 1/2 .472 80289 M16x2.0 M17 to M80x2.0 2.0 .535 1.299 3.622 5/8 .551 80352 M18x2.5 2.5 .583 1.427 3.622 5/8 .598 80354 M20x2.5 2.5 .673 1.624 4.016 3/4 .687 80290 M24x3.0 3.0 .746 1.949 4.016 3/4 .827 80359 THREAD SIZE TPI D2 L1 L D BORE DIA PART #: VAR- 1/16”-27 27 .232 .389 2.244 1/4 .240 80328 1/8”-27 27 .301 .389 2.402 5/16 .330 80329 1/4”-18 18 .370 .583 2.874 3/8 .437 80330 3/8”-18 18 .439 .583 2.874 1/2 .562 80331 1/2”, 3/4”-14 14 .561 .750 3.150 5/8 .704, .905 80332 1”, 1.1/4”, 1.1/2”, 2”-11.5 11.5 .746 .913 4.016 3/4 1.411, 1.484, 1.720, 2.188 80333 2.1/2”-8, 3”-8 8 .746 1.313 4.016 3/4 2.610, 3.232 80334 FOR THREADS TPI D2 L1 L D MIN BORE PART #: VAR- BSW BSF 1/4”-26 26 .197 .519 2.244 1/4 .209 80368 5/16”-22 22 .250 .659 2.402 5/16 .264 80369 1/4”-20 3/8”-20 20 .175 .525 2.244 1/4 .197 80370 3/8”-20 20 .301 .775 2.402 5/16 .323 80371 5/16”-18 7/16”-18 18 .230 .639 2.244 1/4 .256 80372 7/16”-18 18 .362 .917 2.874 3/8 .382 80373 3/8”-16 1/2”, 9/16”-16 16 .283 .781 2.402 5/16 .311 80374 1/2”, 9/16”-16 16 .413 1.031 2.874 1/2 .437 80375 9/16”-16 16 .478 1.156 3.150 1/2 .496 80376 7/16”-14 5/8”, 11/16”-14 14 .335 .893 2.874 3/8 .362 80377 5/8”, 11/16”-14 14 .528 1.250 3.150 5/8 .551 80378 11/16”-14 14 .591 1.393 3.622 5/8 .614 80379 1/2”-12 3/4”-12 12 .362 1.042 2.874 3/8 .413 80380 9/16”-12 3/4”-12 12 .444 1.125 3.150 1/2 .476 80381 3/4”-12 12 .622 1.542 3.622 5/8 .661 80382 5/8”-11 7/8”-11 11 .496 1.318 3.150 1/2 .528 80383 11/16”-11 11 .559 1.409 3.622 5/8 .591 80384 THREAD SIZE TPI D2 L1 L D MIN BORE PART #: VAR- 1/16”, 1/8”-28 28 .252 .480 2.402 5/16 .264 80386 1/16”, 1/8”-28 28 .252 .625 2.402 5/16 .264 80385 1/8”-28 28 .323 .591 2.874 3/8 .324 80388 1/8”-28 28 .323 .768 2.874 3/8 .324 80387 1/4”, 3/8”-19 19 .433 .815 2.874 1/2 .465 80389 1/4”, 3/8”-19 19 .433 1.079 3.150 1/2 .465 80319 3/8”-19 19 .571 1.028 3.622 5/8 .602 80391 3/8”-19 19 .571 1.342 3.622 5/8 .602 80390 1”-11 11 .746 1.681 4.016 3/4 .752 80393 1/2” to 7/8”-14 14 .705 1.678 4.016 3/4 .752 80392 THREAD SIZE TPI D2 L1 L D MIN BORE PART #: VAR- 1/16”-28 28 .232 .401 2402 1/4 .264 80394 1/8”-28 28 .301 .401 2.402 5/16 .342 80320 1/4”-19 19 .400 .605 2.874 1/2 .464 80395 3/8”-19 19 .439 .605 2.874 1/2 .598 80396 1/2”, 3/4”-14 14 .561 .893 3.150 5/8 .748 80397 1”, 1.1/2”, 2”, 2.1/2”-11 11 .746 1.136 4.016 3/4 1.209 80398 FOR THREADS TPI D2 L1 L D MIN BORE PART #: VAR- UNC UNF UNEF #10-24 5/16”; 3/8”-24 9/16” to 11/16”-24 24 .141 .312 1.772 3/16 .150 80360 #12-24 5/16”; 3/8”-24 9/16” to 11/16”-24 24 .163 .354 2.244 1/4 .177 80361 1/4”-20 7/16”; 1/2”-20 3/4” to 1”-20 20 .192 .375 2.244 1/4 .201 80362 5/16”-18 9/16”; 5/8”-18 11/16” to 1.11/16”-18 18 .242 .472 2.402 5/16 .260 80363 3/8”-16 3/4”-16 16 .301 .594 2.402 5/16 .315 80364 7/16”-14 7/8”-14 14 .354 .678 2.874 3/8 .370 80365 1/2”-13 13 .407 .808 3.150 1/2 .429 80366 9/16”-12 1” to 1.1/2”-12 12 .465 .875 3.150 1/2 .484 80367 - 910 - Bass Tool & Supply, Inc. 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