General Index INTRO 6 Alphanumeric Index 7 Tap Series classification 10 Catalogue Structure 16 Product Search System 20 Hardness conversion table 21 System Chart Index by ISO 513 Classification 45 Line up arranged by type of thread 70 Icons SP 73 Spiral fluted taps for blind hole SL 191 Left spiral fluted taps for through hole PO 207 Spiral pointed taps for through hole ST 259 Straight fluted taps for blind and through hole 347 ROLL Thread forming taps 391 CARBIDE Carbide taps 427 LONG Long shank taps 4