Bass Tool & Supply, Inc. Houston Email Fax Toll Free www.basstool.com (713) 682-1889
[email protected] (713) 681-4931 800-442-0042 - 60 - SERIES DESCRIPTION ILLUSTRATION 301 Cobalt, RH 660 CO. TiN Coat, RH 303 Cobalt, LH EXTRA LONG PARABOLIC DRILLS 130° Point (GT-100) Guhring GT-100 Extra Length - A robust tool for drilling in difficult conditions in extremely deep holes. The GT-100’s 130° Point and special web thinning provide quick heat dissipation and accurate centering when drilling a wide variety of materials including low carbon, stainless and unalloyed steels, gray cast iron, hard cast iron and low silicon content aluminum. DIAMETER DEC. INCHES FRACTION/ WIRE/ LETTER MM PART # .0787 2.00 .0807 2.05 .0827 2.10 .0866 2.20 .0890 #43 2.26 .0906 2.30 .0925 2.35 .0933 #42 2.37 .0937 3/32 2.38 .0945 2.40 .0965 2.45 .0984 2.50 .1004 2.55 .1016 #38 2.58 .1024 2.60 .1063 2.70 .1094 7/64 2.78 .1102 2.80 .1122 2.85 .1130 #33 2.87 .1142 2.90 .1161 #32 2.95 .1181 3.00 .1193 3.03 .1201 #31 3.05 .1220 3.10 .1248 1/8 3.17 .1260 3.20 .1280 3.25 .1283 #30 3.26 .1299 3.30 .1319 3.35 .1339 3.40 .1358 #29 3.45 .1378 3.50 .1390 3.53 .1406 9/64-#28 3.57 .1417 3.60 .1457 3.70 .1476 3.75 .1496 #25 3.80 .1520 #24 3.86 .1535 3.90 .1555 3.95 .1563 5/32 3.97 .1575 4.00 .1591 #21 4.04 .1614 4.10 .1618 4.11 .1654 4.20 .1673 4.25 .1693 18 4.30 DIAMETER DEC. INCHES FRACTION/ WIRE/ LETTER MM PART # .1720 11/64 4.37 .1732 4.40 .1772 #16 4.50 .1799 #15 4.57 .1811 4.60 .1819 #14 4.62 .1850 #13 4.70 .1874 3/16 4.76 .1890 #12 4.80 .1909 #11 4.85 .1929 4.90 .1937 #10 4.92 .1969 5.00 .1992 #8 5.06 .2008 5.10 .2012 #7 5.11 .2031 13/64 5.16 .2047 5.20 .2087 5.30 .2126 5.40 .2165 5.50 .2189 7/32 5.56 .2205 5.60 .2209 #2 5.61 .2244 5.70 .2264 5.75 .2283 5.80 .2323 5.90 .2343 15/64 5.95 .2362 6.00 .2382 6.05 .2402 6.10 .2421 C 6.15 .2441 6.20 .2461 D 6.25 .2480 6.30 .2500 1/4-E 6.35 .2520 6.40 .2559 6.50 .2598 6.60 .2610 G 6.63 .2638 6.70 .2657 17/64-H 6.75 .2677 6.80 .2717 I 6.90 .2756 7.00 .2795 7.10 .2811 9/32-K 7.14 .2835 7.20 .2874 7.30 .2913 7.40 .2953 7.50 DIAMETER DEC. INCHES FRACTION/ WIRE/ LETTER MM PART # .2969 19/64 7.54 .2992 7.60 .3031 7.70 .3071 7.80 .3110 7.90 .3126 5/16 7.94 .3150 8.00 .3189 8.10 .3228 P 8.20 .3268 8.30 .3280 21/64 8.33 .3307 8.40 .3319 Q 8.43 .3346 8.50 .3386 8.60 .3425 8.70 .3437 11/32 8.73 .3465 8.80 .3504 8.90 .3543 9.00 .3583 9.10 .3594 23/64 9.13 .3622 9.20 .3661 9.30 .3701 9.40 .3740 9.50 .3748 3/8 9.52 .3772 V 9.58 .3780 9.60 .3819 9.70 .3858 W 9.80 .3898 9.90 .3906 25/64 9.92 .3937 10.00 .4016 10.20 .4063 13/32 10.32 .4134 10.50 .4220 27/64 10.72 .4331 11.00 .4374 7/16 11.11 .4409 11.20 .4488 11.40 .4528 11.50 .4531 29/64 11.51 .4685 11.90 .4689 15/32 11.91 .4724 12.00 .4764 12.10 .4843 31/64 12.30 .4921 12.50 .5000 1/2 12.70 .5118 13.00 ORDERING EXAMPLE: Part # Prefix = Series No. Part # Suffix = MM Size Example: Extra Length Series #2, HSS, 1/2” Part Number = 503-12.70 DIMENSIONS DRILL DIA. UP TO & INCLUDING EXTRA LENGTH DRILLS CLASS 1 CLASS 2 CLASS 3 FLUTE LENGTH OVERALL LENGTH FLUTE LENGTH OVERALL LENGTH FLUTE LENGTH OVERALL LENGTH .0835 3.11/32 4.29/32 .0929 3.17/32 5.5/16 .1043 3.3/4 5.1/2 .1181 3.15/16 5.7/8 5.1/8 7.15/32 .1319 4.1/8 6.1/8 5.5/16 7.7/8 .1476 4.17/32 6.1/2 5.23/32 8.9/32 7.3/32 10.7/16 .1673 4.3/4 6.7/8 5.29/32 8.21/32 7.15/32 11.1/32 .1870 4.29/32 7.9/32 6.5/16 9.1/4 7.7/8 11.5/8 .2087 5.5/16 7.11/16 6.11/16 9.21/32 8.9/32 12.13/32 .2362 5.1/2 8.1/16 7.3/32 10.1/4 8.27/32 13 .2638 5.29/32 8.15/32 7.15/32 10.13/16 9.1/4 13.25/32 .2953 6.3/32 8.27/32 7.7/8 11.13/32 9.27/32 14.9/16 .3346 6.1/2 9.7/16 8.9/32 12 10.7/16 15.11/32 .3740 6.7/8 9.27/32 8.21/32 12.19/32 11.1/32 16.5/32 .4173 7.9/32 10.7/16 9.1/4 13.3/8 11.5/8 16.15/16 .4646 7.11/16 11.1/32 9.27/32 14.3/8 12.3/16 17.15/16 .5197 8.1/16 11.5/8 10.1/4 14.3/4 13 18.7/8 GT-100 Parabolic Taper Shank Drills are also available in the following styles (up to 1.9/32” dia.) A B C SERIES NO. DESCRIPTION ILLUSTRATION HSS COBALT TiN HSS COBALT TiN 551 645 656 662 PARABOLIC, taper shank, GT 100, RH A 526 620 --- --- PARABOLIC, extra length 1, taper shank, GT 100, RH B 527 621 --- --- PARABOLIC, extra length 2, taper shank, GT 100, RH C MICRO-PRECISION DRILLS ● High Speed Cobalt increases production rates ● The oversize standard shank enhances tool rigidity ● Two shank diameters for the entire micro drill line simplifies drill indexing, 25 OAL ● Absolute tool concentricity ● Tolerance on all Diameters: +0.000 - 0.004 mm ● Tolerance on Shank: h8 (For P/N: Use Series No. as Prefix & MM Size as Suffix) Range: .050 mm (.0020”) - 1.6 mm (.0630”) in increments of .01mm (.0004”) TOLERANCE +0/0.004 mm All dimensions in mm WORKING LENGTH FLUTE LENGTH SHANK DIA. 0.05 0.06 0.07 0.4 0.3 1 0.08 0.09 0.5 0.4 1 0.10 0.11 0.12 0.7 0.5 1 0.13 0.14 0.15 1.0 0.8 1 0.16 0.17 0.18 0.19 1.4 1.1 1 0.20 0.21 0.22 0.23 0.24 1.8 1.5 1 0.25 0.26 0.27 0.28 0.29 0.30 2.2 1.9 1 0.31 0.32 0.33 0.34 0.35 0.36 0.37 0.38 2.8 2.4 1 0.39 0.40 0.41 0.42 0.43 0.44 0.45 0.46 0.47 0.48 3.6 3.0 1 0.49 0.50 0.51 0.52 0.53 4.0 3.4 1 0.54 0.55 0.56 0.57 0.58 0.59 0.60 4.5 3.9 1 0.61 0.62 0.63 0.64 0.65 0.66 0.67 5.0 4.2 1 0.68 0.69 0.70 0.71 0.72 0.73 0.74 0.75 5.6 4.8 1 0.76 0.77 0.78 0.79 6.3 5.3 1 0.80 0.85 6.3 5.3 1.5 0.90 0.95 7.1 6.0 1.5 1.00 1.05 8.0 6.8 1.5 1.10 1.15 9.0 7.6 1.5 1.20 1.25 1.30 10.0 8.5 1.5 1.35 1.40 1.45 11.2 9.5 1.5 CLASS NO. SERIES NO. DESCRIPTION ILLUSTRATION HSS HSS TiN COAT COBALT 1 502 670 618 PARABOLIC extra length, GT 100, RH 2 503 671 619 PARABOLIC extra length, GT 100, RH 3 504 --- --- PARABOLIC extra length, GT 100, RH
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