Tap Internal Threading Internal Threading DRILLTAP Work Material Tap Drill

Types of Taps with respect to Flute Right hand, Left hand Right hand, Left hand Straight, Spiral Flute, Gun Nose, Forming Straight, Spiral Flute, Gun Nose, Forming

Taps Respective to Use Hand Taps Hand Taps Machine Taps Machine Taps

Use of Taps –Internal Threads

◈ TYPES of HOLES BIND HOLE BOTTOMING HOLE OPEN HOLE THROUGH HOLE RECRSSED HOLE STEPPED HOLE OBSTRUCTED HOLE

Material Carbon Steel Carbon Steel HSS HSS Carbide Carbide Insert Insert Thread Milling Cutters Thread Milling Cutters

Tap Terminology

Details of Thread Part Major Diameter – The largest diameter of a straight thread Minor Diameter – The smallest diameter of a straight thread Pitch Diameter – On a straight screw thread, the diameter of an imaginary cylinder, the surface of pitch would pass through the threads at such points as to make equal the width of the threads and the width of the spaces cut by the surface of the cylinder. Pitch – The distance from a point on a screw thread to a corresponding point on the next thread measured parallel to the axis. Lead Angle – The angle made by the helex of a thread at the pitch diameter with a line perpendicular to the axis. NUT a – HALF ANGLE MINOR DIA. MAJOR DIA. PITCH DIA. LEAD ANGLE AT PITCH DIA. PITCH A a a SCREW AXIS A – INCLUDED THREAD ANGLE DIAMETER OF IMAGINARY CYLINDER PITCH DIAMETER WIDTH OF THREAD WIDTH OF SPACE =

Effective Ø Tolerances

Technical Descriptions of Blank

Details of Flute Area

Chamfer forms ( Entry Angle ) Form A Form A Form B,Gun Nose Form B,Gun Nose Form C Form C Form D Form D Form E Form E

Thread Forms Metric Metric Coarse, Fine BSW BSWBSF,BSW,BA,BScy,BSP,BSPT, ANSI ANSIUNC,UNF,UNEF,NPT,NPSF,UNJC,NGT Special Forms Special Forms Acme,Stub Acme,PG,VG,

Manufacturing Process Turning Turning Milling ( flute, square ) Milling ( flute, square ) Centering / cone Centering / cone Heat Treatment Heat Treatment Cylindrical Grinding Cylindrical Grinding Square, Flute, Thread, Lead (Chamfer ) Square, Flute, Thread, Lead (Chamfer ) Coating,Surface treatment Coating,Surface treatment Marking Marking