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
    A42769 ACT .495 1/2-14 1/2 .875 3-1/2 NPTF Pipe Thread 4 Uncoated 100
    $339.07
  • A42762 ACT .495 1/2-14 1/2 .875 3-1/2 NPT Pipe Thread 4 Uncoated 100
    $339.07
  • A50085 ACT .495 1/2-14 1/2 .875 3-1/2 NPTF Pipe Thread 4 ALTiN 15
    $356.48
  • A42770 ACT .495 3/4-14 1/2 .875 3-1/2 NPTF Pipe Thread 4 Uncoated 41
    $339.07
  • A42763 ACT .495 3/4-14 1/2 .875 3-1/2 NPT Pipe Thread 4 Uncoated 35
    $339.07
  • A71245 ACT .290 3/8-16 5/16 .750 3 UN Thread Coolant Through 4 ALTiN 14
    $272.08
  • A71246 ACT .290 3/8-24 5/16 .750 3 UN Thread Coolant Through 4 ALTiN 3
    $272.08
  • A42752 ACT .340 7/16-14 3/8 .875 3 UN Thread Coolant Through 4 Uncoated 15
    $304.57
  • A42753 ACT .340 7/16-20 3/8 .875 3 UN Thread Coolant Through 4 Uncoated 8
    $306.22
  • A71248 ACT .340 7/16-20 3/8 .875 3 UN Thread Coolant Through 4 ALTiN 10
    $316.85
  • A42754 ACT .350 1/2-13 3/8 .875 3-1/2 UN Thread Coolant Through 4 Uncoated 61
    $315.66
  • A78993 ACT 0.4950 3/4 1/2 1 3 UN Thread 6 Uncoated 18
    $267.29
  • A71249 ACT .350 1/2-13 3/8 .875 3-1/2 UN Thread Coolant Through 4 ALTiN 10
    $326.99
  • A78994 ACT 0.4950 3/4 1/2 1-3/8 3 UN Thread 6 Uncoated Available to Order*
    $271.75
  • A42755 ACT .350 1/2-20 3/8 .875 3-1/2 UN Thread Coolant Through 4 Uncoated Available to Order*
    $315.66
  • A71250 ACT .350 1/2-20 3/8 .875 3-1/2 UN Thread Coolant Through 4 ALTiN 37
    $326.99
  • A71251 ACT .495 3/4-10 1/2 1.250 3-1/2 UN Thread Coolant Through 4 ALTiN 18
    $351.69
  • A42785 ACT .470 M16 x 2.00 1/2 1.250 3-1/2 Metric Thread 5 Uncoated 44
    $339.07
  • A42786 ACT .470 M18 x 2.50 1/2 1.250 3-1/2 Metric Thread 5 Uncoated 12
    $339.07
  • A50103 ACT .470 M20 x 3.00 5/8 1.250 3-1/2 Metric Thread 5 ALTiN 2
    $276.40
  • A42735 ACT .370 9/16-12 1/2 .875 3-1/2 UN Thread 4 Uncoated 60
    $267.37
  • A50064 ACT .370 9/16-12 1/2 .875 3-1/2 UN Thread 4 ALTiN 12
    $285.98
  • A42736 ACT .370 9/16-18 1/2 .875 3-1/2 UN Thread 4 Uncoated 20
    $267.37
  • A50065 ACT .370 9/16-18 1/2 .875 3-1/2 UN Thread 4 ALTiN 68
    $285.98
  • A42737 ACT .470 5/8-11 1/2 1.250 3-1/2 UN Thread 5 Uncoated 100
    $339.07
  • A79014 ACT 0.4950 3/4 1/2 1 3 UN Thread 6 ALTiN 24
    $284.61
  • A42738 ACT .470 5/8-18 1/2 1.250 3-1/2 UN Thread 5 Uncoated 100
    $339.07
  • A79015 ACT 0.4950 3/4 1/2 1-3/8 3 UN Thread 6 ALTiN Available to Order*
    $289.14
  • A42739 ACT .495 3/4-10 1/2 1.250 3-1/2 UN Thread 5 Uncoated 62
    $339.07
  • A42740 ACT .495 3/4-16 1/2 1.250 3-1/2 UN Thread 5 Uncoated 100
    $339.07

* Lead times can vary from 1–10 business days. Call (908) 98-ATLAS or email sales@atlascuttingtools.com for details.

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