Threading Technology – Clamping Technology 520

251 Thread Mills with Countersinking Step GSF UNC UNF UN M MF NPSF Rp (BSPP) G BGF W BSW, BSF NPT NPTF Rc (BSPT) STI SELF-LOCK Accessories Tech. Info v c / f z ZBGF GF(I), GF-Z GF-Vario-Z GF-H GF(I)-KEG ZGF(I) CIRC-GF Gigant FPC, FMC MoSys GSF (Aero) GSF-Z Product Finder Straight Flutes Right-Hand Spiral Flutes Right-Hand Spiral Flutes Right-Hand Spiral Flutes GSF GSF GSF Aero GSF-Z Metric Shank Metric Shank Metric Shank Metric Shank Page 252 253 UNC 254 255 UNF 256 257 M 258 259 MF 260 G (BSP) 261 LK-M Thread milling cycle 1 / 2 P 1 P 1 / 2 P 1 / 3 P Possible modifications Face chamfer with/without cutting face AZR/AZ (alternating teeth) Remove incomplete thread IKZN (internal coolant supply exiting in the flutes) Recessed neck Coolant grooves along the shank For a description of these modifications, see page 357