184 Каталог KYOCERA 2016 Твердосплавный вращающийся режущий инструмент ENG Стр.182

Catalog KYOCERA 2016 Solid carbide cutting tools Стр. 182 0184 ENG Lab2u

INDEX TECHNICAL SAWS REAMERS BORING BARS ENGRAVERS THREAD nMJLLS ROUTERS END MILLS DRILLS & TAPS TAPS ENGINEERING DATA TAP MARKING SYSTEM STANDARD SYSTEM OF TAP MARKING Taps, dies and other types of threading tools are marked according to the Standard System of Marking Ground Thread Taps. Tools are marked with the nominal size, number of threads per inch (pitch), and the appropriate thread form symbol and pitch diameter symbol. Symbols typically used are listed. PITCH DIAMETER LIMIT SYMBOLS All standard ground thread taps are marked with the letter “G” to designate Ground Thread. The letter G will be followed by the letter “H” to designate above basic; or the letter “L” to designate below basic. The number following H or L signifies the number of .0005” steps above or below the basic pitch diameter. For instance, the tap pictured above is a 3/8” dia. tap with 20 threads per inch (pitch), and has a NS (American National Special Thread) thread form. The tap is made from High Speed Steel, and the GH-3 pitch diameter limit symbol indicates a Ground Thread tap with pitch diameter limits .0010 to .0015 over basic. Pitch Diameter Limits for taps to 1” diameter inclusive: L1 = Basic to Basic minus .0005 H1 = Basic to Basic plus .0005 H2 = Basic plus .0005 to Basic plus .0010 H3 = Basic plus .0010 to Basic plus .0015 H4 = Basic plus .0015 to Basic plus .0020 H5 = Basic plus .0020 to Basic plus .0025 H6 = Basic plus .0025 to Basic plus .0030 Taps larger than 1” dia. are ground to a .0010” tolerance on the pitch diameter and are, for example, H4 (Basic plus .0010” to Basic plus .0020” ). THREAD FORM SYMBOLS ACME-C Acme Thread-Centralizing ACME-G Acme Thread-General Purpose AMO American Standard Microscope Objective Thread ANPT Aeronautical National Form Taper Pipe Thread (Ground thread tap marked NPT) BA British Association Standard Thread BSF British Standard Fine Thread Series BSP British Standard Pipe BSPP British Standard Pipe (Parallel) Thread BSPT British Standard Taper Pipe Thread BSW British Standard Whitworth Coarse Thread Series M Metric ScrewThread Series N American National 8, 12 and 16 Thread Series (8N, 12N, 16N) NBUTT American Buttress Screw Thread NC American National Coarse Thread Series NEF American National Extra Fine Thread Series NF American National Fine Thread Series NGO National Gas Outlet Thread NGT National Gas Taper Thread (see “SGT”) NH American National Hose Coupling and Fire Hose Coupling Threads NPS For tap marking only (See NPSC, NPSM) NPSC American National Standard Straight Pipe Thread in Pipe Couplings (Tap marked NPS) NPSF Dryseal American National Standard Fuel Internal Straight Pipe Thread NPSH American National Standard Straight Pipe Thread for Hose Couplings NPSI Dryseal American National Standard Intermediate Internal Straight Pipe Thread NPSL American National Standard Straight Pipe Thread for Loose Fitting Mechanical Joints with Locknuts NPSM American National Standard Straight Pipe Threads for Free-Fitting Mechanical Joints for Fixtures (Tap marked NPS) NPT American National Standard Taper Pipe Thread (See ANPT, NPTR) NPTF Dryseal American National Standard Taper Pipe Thread NPTR American National Standard Taper Pipe Thread for Railing Joints (Tap marked NPT) NS American National Thread-Special PG Panzer Gewinde PTF Dryseal SAE Short Taper Pipe Thread SGT Special Gas Taper Thread SPL-PTF Dryseal Special Taper Pipe Thread STI Special Thread for Helical Coil Wire Screw Thread Inserts Stub Acme Stub Acme Thread UN Unified Constant Pitch Thread Series UNC Unified Coarse Thread Series UNEF Unified Extra Fine Thread Series UNF Unified Fine Thread Series UNJ Unified Thread Series with a 0.15011P to 0.18042P Controlled Root Radius on External Thread only. UNJC Unified Coarse Thread Series with a 0.15011P to 0.18042P Controlled Root Radius on External Thread only. UNJF Unified Fine Thread Series with a 0.15011P to 0.18042P Controlled Root Radius on External Thread only. UNM Unified Miniature Thread Series UNR Unified Constant Pitch Thread Series with a 0.108P to 0.144P Controlled Root Radius; Ext. thread only. UNRC Unified Coarse Thread Series with a 0.108P to 0.144P Controlled Root Radius; Ext. thread only. UNRF Unified Fine Thread Series with a 0.108P to 0.144P Controlled Root Radius; External thread only. UNS Unified Thread-Special V A 60° “V” thread with Truncated Crest and Root. The theoretical “V” Form is usually flatted to the user's specifications. WHIT British Standard Whitworth Special Thread Taps are not marked with “U” but with the symbol for the corresponding American Standard thread form with which it is compatible. See page 183 for additional information on UNJ taps. 182 Kyocera