Thread Mills

Thread Mills

Made in USA since 1992

Which thread do you need?

NPS Pipe Threads
NPS Pipe Threads
UN Threads
UN Threads Unified inch threads, coarse and fine 3, 4 and 5 flute options Best for Standard inch threading, blind or through
UN Threads - Single Form
UN Threads - Single Form
UN Threads - Coolant Through
UN Threads - Coolant Through Same UN threads, coolant fed to the cut Clears chips in deep and blind holes Best for Deep holes and lights-out production
NPT Pipe Threads
NPT Pipe Threads Standard tapered pipe thread Sealed with tape or thread compound Best for General pipe and fitting work
NPTF Pipe Threads
NPTF Pipe Threads Dryseal variant of NPT Crests crush to seal metal-to-metal Best for Hydraulic and fuel lines, no sealant
Metric Threads
Metric Threads ISO metric, multiple pitches per diameter 3, 4 and 5 flute options Best for Metric threading from M4 upward

Thread mills cut internal or external threads using a helical milling path rather than a traditional tap, which reduces the risk of tool breakage in blind holes and hardened materials while allowing one tool to cut multiple thread sizes when paired with the right program. We stock thread mills for UN Threads (including coolant-through versions for improved chip evacuation), NPT Pipe Threads, NPTF Pipe Threads, and Metric Threads.

Because thread milling doesn't rely on axial tap pressure to form threads, it's often the preferred method for hardened steels, thin-walled parts, and large-diameter threads where tapping risks breakage. All thread mills are manufactured in the USA.

  • Compare SKU Vendor Cutter Diameter Thread Size (D1) Shank Diameter (D2) Thread Length (L2) Overall Length (L1) Thread Type Number of Flutes Coating In Stock Price Quantity
    A50078 ACT .495 1/2-14 1/2 .875 3-1/2 NPT Pipe Thread 4 ALTiN 54
    $357.76
  • A50086 ACT .495 3/4-14 1/2 .875 3-1/2 NPTF Pipe Thread 4 ALTiN 4
    $357.76
  • A50079 ACT .495 3/4-14 1/2 .875 3-1/2 NPT Pipe Thread 4 ALTiN 31
    $357.76
  • A50101 ACT .470 M16 x 2.00 1/2 1.250 3-1/2 Metric Thread 5 ALTiN 13
    $357.76
  • A50102 ACT .470 M18 x 2.50 1/2 1.250 3-1/2 Metric Thread 5 ALTiN 10
    $357.76
  • A42787 ACT .470 M20 x 3.00 5/8 1.250 3-1/2 Metric Thread 5 Uncoated 12
    $357.80
  • A50066 ACT .470 5/8-11 1/2 1.250 3-1/2 UN Thread 5 ALTiN 26
    $357.76
  • A50067 ACT .470 5/8-18 1/2 1.250 3-1/2 UN Thread 5 ALTiN 34
    $357.76
  • A50068 ACT .495 3/4-10 1/2 1.250 3-1/2 UN Thread 5 ALTiN 18
    $357.76
  • A50069 ACT .495 3/4-16 1/2 1.250 3-1/2 UN Thread 5 ALTiN 22
    $357.76
  • Total: items /

Adding your products to cart

View Cart Continue Shopping