b' STRAIGHT FLUTE TAP THUDERTAP Material:High Speed Steel TAP TROUBLESHOOTING GUIDE Size:Machine Screw Coating/Finish:Bronze OxideChamfer:Taper (7-10 threads long); Plug (3-5 threads long) Trouble Possible Cause Correction Bottoming (1-2 threads long)Oversize Pitch Diameter Incorrect tap Use correct H limitUse longer chamfered tapChip packing Use spiral pointed tapUse larger drill size SizePkg QtyThread Limit# of FlutesDrill SizeT62HDT TaperT62HDP Plug T62HDB BottomingShorten length of thread in blind holesGalling Reduce tapping speed 4-40 NC 12 H23 43 071040071090071140Use lubricants 6-32 NC 12 H3336 0710410710910711416-40 NF 12 H2333 071042071092071142Torn or Rough Threads Dull tap Resharpen or replace 8-32 NC 12 H3429 071043071093071143Chamfer too short Increase chamfer length 8-36 NF 12 H2429 071044071094071144 Galling Use lubricant 10-24 NC 12 H3425 071045071095071145Reduce speed 10-32 NF 12 H3421 071046071096071146Use larger drill 12-24 NC 12 H3416 07104707109707114712-28 NF 12 H3 4 15071048071098071148Breakage Incorrect tap selection Increase chamfer length Use spiral pointed taps in through holes Packaging: Snap PackTapping too deepExcessive tapping torque Increase hole sizeShorten thread lengthIncrease chamfer lengthOperating conditions Reduce tapping speed Material:High Speed Steel Avoid bottoming out the tap Size:FractionalChipping Incorrect tap selection Increase chamfer length Coating/Finish:Bronze Oxide Avoidchippackinginflutes Chamfer:Taper (7-10 threads long); Plug (3-5 threads long) TAPS & DIESOperating conditions Reduce tapping speed Bottoming (1-2 threads long) TAPS & DIESUse larger drillEnsure adequate lubricantExcessive Wear Incorrect tap selection Increase chamfer lengthOperating conditions Reduce tapping speed SizePkg QtyThread Limit# of FlutesDrill SizeT61HDT TaperT61HDP PlugT61HDB BottomingEnsure adequate lubricantUse larger drill 1/4-20 NC 6 H34 0710000710600711007 1/4-28 NF 6 H34 0710010710610711013 5/16-18 NC 6 H34 071002071062071102F 5/16-24 NF 6 H34 I071003071063071103 TAP SELECTION GUIDE 3/8-16 NC 6 H34 0710040710640711045/16 3/8-24 NF 6 H34 071005071065071105Q 7/16-14 NC 3 H34 071006071066071106UStraight Flute Tapscontainmostofthechipintheflutesandcan 7/16-20 NF 3 H34 07100707106707110725/64 1/2-13 NC 3 H34 07100807106807110827/64 be used for through or blind holes.1/2-20 NF 3 H34 07100907106907110929/64 9/16-12 NC 1 H34 07101007107007111031/64 9/16-18 NF 1 H34 07101107107107111133/64Spiral Point Taps push the chips forward and are recommended5/8-11 NC 1 H34 07101207107207111217/32 for through holes. 5/8-18 NF 1 H34 07101307107307111337/64 3/4-10 NC 1 H34 07101407107407111421/32 3/4-16 NF 1 H34 07101507107507111511/16Taper Taps are used for starting threads in tougher materials.7/8-9 NC 1 H34 07101607107607111649/64 7/8-14 NF 1 H34 07101707107707111713/16 1-8 NC 1 H34 0710180710780711187/8Bottoming Taps are used for blind holes, to obtain the maximum 1-12 NF 1 H34 07101907107907111959/64 1-1/8-7 NC 1 H3 4071020071080071120length of thread.63/64 Packaging: 1/4-20 through 1/2-20 = Snap Pack; 9/16-1/2 through1-1/8-7 = Tube Plug Taps are suitable for either through or blind holes, where ample clearance remains between the thread and the bottom of the hole. ToolStraightflutetapscanbeNC = National Course NF = National Fine Tip used in through orNS = National Special NPT = National Pipe Thread blind holes 800-942-1501 www.triumphtwistdrill.comwww.triumphtwistdrill.com800-942-150146 47'