
AT-1 Advanced Performance One Pass Thread Mill List 16620/16625 - A Brand® AT-1 List 16630/16631 - A Brand® AT-1 NPT/NPTF Work Material Cutting Speed Feed RateSFM(in/t) Low Carbon Steel ~C0.25% 260 - 525 0.0004 - 0.002 Medium Carbon Steel C0.25%~0.45% 260 - 525 0.0004 - 0.002 High Carbon Steel C0.45%~ 260 - 525 0.0004 - 0.002 Alloy Steel SCM 200 - 400 0.0004 - 0.002 25-45 HRC 260 - 650 0.0004 - 0.002 Hardened Steel 45-55 HRC - - 50-60 HRC - - Stainless Steel SUS 200 - 400 0.0004 - 0.002 Tool Steel SKD - - Cast Steel SC 200 - 400 0.0004 - 0.002 Cast Iron FC 260 - 525 0.0004 - 0.002 Ductile Cast Iron FCD 200 - 400 0.0004 - 0.002 Copper Cu 260 - 525 0.001 - 0.004 Brass Bs 260 - 525 0.001 - 0.004 Brass Casting BsC 260 - 525 0.001 - 0.004 Bronze PB 260 - 525 0.001 - 0.004 Aluminum Al 260 - 525 0.001 - 0.004 Aluminum Alloy Casting AD, ADC 330 - 1000 0.002 - 0.008 Magnesium Alloy Casting MC 330 - 1000 0.002 - 0.008 Zinc Alloy Casting ZDC 330 - 1000 0.002 - 0.008 Titanium Alloy Ti-6Al-4V - - Nickel Alloy Inconel - - Thermosetting Plastic - 260 - 525 0.001 - 0.004 Thermo Plastic - 260 - 525 0.001 - 0.004 1. The indicated speeds and feeds are for water-soluble coolant. 2. Water-soluble coolant is not suitable for threading magnesium alloy. 3. Please adjust the cutting conditions depending on the rigidity of the machine, tool holders, and workpiece clamping. 4. If the threading length is long, or when machining a large-pitch thread, reduce the feed rate and take multiple passes. 5. If a machined parallel internal thread is tapered and prevents the go-gauge from going through, add a zero cut/spring pass. WWW.OSGTOOL.COM Threading Technical 679