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
    A42780 ACT .300 M10 x 1.50 5/16 .750 3 Metric Thread 4 Uncoated 100
    $220.74
  • A42753 ACT .340 7/16-20 3/8 .875 3 UN Thread Coolant Through 4 Uncoated 8
    $306.22
  • A42726 ACT .180 1/4-28 3/16 .500 2-1/2 UN Thread 3 Uncoated 100
    $156.83
  • A78991 ACT 0.3880 1/2 1/2 3/4 3 UN Thread 4 Uncoated 58
    $195.22
  • A71248 ACT .340 7/16-20 3/8 .875 3 UN Thread Coolant Through 4 ALTiN 10
    $316.85
  • A50096 ACT .300 M10 x 1.50 5/16 .750 3 Metric Thread 4 ALTiN 13
    $229.69
  • A50055 ACT .180 1/4-28 3/16 .500 2-1/2 UN Thread 3 ALTiN 66
    $163.02
  • A78992 ACT 0.3880 1/2 1/2 1-1/4 3 UN Thread 4 Uncoated 3
    $199.67
  • A42781 ACT .360 M12 x 1.00 3/8 .875 3-1/2 Metric Thread 4 Uncoated 100
    $237.15
  • A42754 ACT .350 1/2-13 3/8 .875 3-1/2 UN Thread Coolant Through 4 Uncoated 61
    $315.66
  • A42727 ACT .240 5/16-18 1/4 .625 2-1/2 UN Thread 3 Uncoated 100
    $185.28
  • 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
  • A50097 ACT .360 M12 x 1.00 3/8 .875 3-1/2 Metric Thread 4 ALTiN 18
    $249.11
  • A50056 ACT .240 5/16-18 1/4 .625 2-1/2 UN Thread 3 ALTiN 100
    $192.76
  • A78994 ACT 0.4950 3/4 1/2 1-3/8 3 UN Thread 6 Uncoated Available to Order*
    $271.75
  • A42782 ACT .360 M12 x 1.25 3/8 .875 3-1/2 Metric Thread 4 Uncoated 85
    $237.15
  • A42755 ACT .350 1/2-20 3/8 .875 3-1/2 UN Thread Coolant Through 4 Uncoated Available to Order*
    $315.66
  • A42728 ACT .240 5/16-24 1/4 .625 2-1/2 UN Thread 3 Uncoated 100
    $185.28
  • A78995 ACT 0.0640 2 1/8 5/32 1-1/2 UN Thread 3 ALTiN 15
    $93.59
  • A71250 ACT .350 1/2-20 3/8 .875 3-1/2 UN Thread Coolant Through 4 ALTiN 37
    $326.99
  • A50098 ACT .360 M12 x 1.25 3/8 .875 3-1/2 Metric Thread 4 ALTiN 17
    $249.11
  • A50057 ACT .240 5/16-24 1/4 .625 2-1/2 UN Thread 3 ALTiN 22
    $192.76
  • A78996 ACT 0.0720 3 1/8 5/32 1-1/2 UN Thread 3 ALTiN 21
    $93.59
  • A42783 ACT .360 M12 x 1.75 3/8 .875 3-1/2 Metric Thread 4 Uncoated 38
    $237.15
  • A42756 ACT .495 3/4-10 1/2 1.250 3-1/2 UN Thread Coolant Through 4 Uncoated 11
    $466.15
  • A42729 ACT .290 3/8-16 5/16 .750 3 UN Thread 4 Uncoated 100
    $220.74
  • A78997 ACT 0.0800 4 1/8 1/8 2 UN Thread 3 ALTiN 27
    $98.21
  • A71251 ACT .495 3/4-10 1/2 1.250 3-1/2 UN Thread Coolant Through 4 ALTiN 18
    $351.69
  • A50099 ACT .360 M12 x 1.75 3/8 .875 3-1/2 Metric Thread 4 ALTiN 11
    $249.11
  • A50058 ACT .290 3/8-16 5/16 .750 3 UN Thread 4 ALTiN 100
    $229.69
  • A78998 ACT 0.0800 4 1/8 1/4 2 UN Thread 3 ALTiN 10
    $98.21
  • A42784 ACT .360 M14 x 1.50 3/8 .875 3-1/2 Metric Thread 4 Uncoated 28
    $237.15
  • A42757 ACT .495 3/4-16 1/2 1.250 3-1/2 UN Thread Coolant Through 4 Uncoated 31
    $466.15
  • A42730 ACT .290 3/8-24 5/16 .750 3 UN Thread 4 Uncoated 100
    $220.74
  • A78999 ACT 0.0980 (2.5 mm) 6 1/8 1/4 2 UN Thread 4 ALTiN 17
    $95.08
  • A71252 ACT .495 3/4-16 1/2 1.250 3-1/2 UN Thread Coolant Through 4 ALTiN 12
    $484.00
  • A50100 ACT .360 M14 x 1.50 3/8 .875 3-1/2 Metric Thread 4 ALTiN 13
    $249.11
  • A50059 ACT .290 3/8-24 5/16 .750 3 UN Thread 4 ALTiN 43
    $229.69
  • A79000 ACT 0.0980 (2.5 mm) 6 1/8 3/8 2 UN Thread 4 ALTiN 3
    $98.50
  • A42785 ACT .470 M16 x 2.00 1/2 1.250 3-1/2 Metric Thread 5 Uncoated 44
    $339.07
  • A42731 ACT .340 7/16-14 3/8 .875 3 UN Thread 4 Uncoated 100
    $237.03
  • A79001 ACT 0.1200 8 1/8 5/16 2 UN Thread 4 ALTiN 20
    $95.08
  • A50101 ACT .470 M16 x 2.00 1/2 1.250 3-1/2 Metric Thread 5 ALTiN 13
    $357.76
  • A50060 ACT .340 7/16-14 3/8 .875 3 UN Thread 4 ALTiN 30
    $247.67
  • A79002 ACT 0.1200 8 1/8 1/2 2 UN Thread 4 ALTiN 17
    $98.50
  • A42786 ACT .470 M18 x 2.50 1/2 1.250 3-1/2 Metric Thread 5 Uncoated 12
    $339.07
  • A42732 ACT .340 7/16-20 3/8 .875 3 UN Thread 4 Uncoated 100
    $237.03
  • A79003 ACT 0.1380 (3.5 mm) 10 3/16 3/8 2 UN Thread 4 ALTiN 8
    $92.65
  • A50102 ACT .470 M18 x 2.50 1/2 1.250 3-1/2 Metric Thread 5 ALTiN 10
    $357.76
  • A50061 ACT .340 7/16-20 3/8 .875 3 UN Thread 4 ALTiN 20
    $247.67
  • A79004 ACT 0.1380 (3.5 mm) 10 3/16 5/8 2 UN Thread 4 ALTiN 20
    $96.44
  • A42787 ACT .470 M20 x 3.00 5/8 1.250 3-1/2 Metric Thread 5 Uncoated 12
    $357.80
  • A42733 ACT .350 1/2-13 3/8 .875 3-1/2 UN Thread 4 Uncoated 100
    $236.13
  • A79005 ACT 0.1600 12 3/16 5/8 2 UN Thread 4 ALTiN 23
    $96.44
  • A50103 ACT .470 M20 x 3.00 5/8 1.250 3-1/2 Metric Thread 5 ALTiN 2
    $276.40
  • A50062 ACT .350 1/2-13 3/8 .875 3-1/2 UN Thread 4 ALTiN 45
    $247.50
  • A79006 ACT 0.1800 1/4 3/16 1/2 2 UN Thread 4 ALTiN 2
    $100.07
  • A42734 ACT .350 1/2-20 3/8 .875 3-1/2 UN Thread 4 Uncoated 69
    $236.13
  • A79007 ACT 0.1800 1/4 3/16 3/4 2 UN Thread 4 ALTiN 8
    $102.21
  • A50063 ACT .350 1/2-20 3/8 .875 3-1/2 UN Thread 4 ALTiN 49
    $247.50
  • A79008 ACT 0.2400 5/16 1/4 1/2 2-1/2 UN Thread 4 ALTiN 21
    $118.49
  • A42735 ACT .370 9/16-12 1/2 .875 3-1/2 UN Thread 4 Uncoated 60
    $267.37
  • A79009 ACT 0.2400 5/16 1/4 3/4 2-1/2 UN Thread 4 ALTiN 14
    $123.98
  • A50064 ACT .370 9/16-12 1/2 .875 3-1/2 UN Thread 4 ALTiN 12
    $285.98
  • A79010 ACT 0.3000 3/8 3/8 3/4 2-1/2 UN Thread 4 ALTiN 11
    $148.59
  • A42736 ACT .370 9/16-18 1/2 .875 3-1/2 UN Thread 4 Uncoated 20
    $267.37
  • A79011 ACT 0.3000 3/8 3/8 1 2-1/2 UN Thread 4 ALTiN 13
    $155.18
  • A50065 ACT .370 9/16-18 1/2 .875 3-1/2 UN Thread 4 ALTiN 68
    $285.98
  • A79012 ACT 0.3880 1/2 1/2 3/4 3 UN Thread 4 ALTiN 18
    $212.55
  • A42737 ACT .470 5/8-11 1/2 1.250 3-1/2 UN Thread 5 Uncoated 100
    $339.07
  • A79013 ACT 0.3880 1/2 1/2 1-1/4 3 UN Thread 4 ALTiN 13
    $217.69
  • A50066 ACT .470 5/8-11 1/2 1.250 3-1/2 UN Thread 5 ALTiN 26
    $357.76
  • 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
  • A50067 ACT .470 5/8-18 1/2 1.250 3-1/2 UN Thread 5 ALTiN 34
    $357.76
  • A42739 ACT .495 3/4-10 1/2 1.250 3-1/2 UN Thread 5 Uncoated 62
    $339.07
  • A50068 ACT .495 3/4-10 1/2 1.250 3-1/2 UN Thread 5 ALTiN 18
    $357.76
  • A42740 ACT .495 3/4-16 1/2 1.250 3-1/2 UN Thread 5 Uncoated 100
    $339.07
  • A50069 ACT .495 3/4-16 1/2 1.250 3-1/2 UN Thread 5 ALTiN 22
    $357.76
  • A42741 ACT .620 7/8-9 5/8 1.250 3-1/2 UN Thread 5 Uncoated 81
    $456.00
  • A50070 ACT .620 7/8-9 5/8 1.250 3-1/2 UN Thread 5 ALTiN 13
    $478.11
  • A42742 ACT .620 7/8-14 5/8 1.250 3-1/2 UN Thread 5 Uncoated 89
    $456.00
  • A50071 ACT .620 7/8-14 5/8 1.250 3-1/2 UN Thread 5 ALTiN 8
    $478.11
  • A42743 ACT .620 1-8 3/4 1.375 4 UN Thread 5 Uncoated 100
    $451.59
  • A50072 ACT .620 1-8 3/4 1.375 4 UN Thread 5 ALTiN 14
    $479.09
  • A42744 ACT .620 1-12 3/4 1.375 4 UN Thread 5 Uncoated 100
    $451.59
  • A50073 ACT .620 1-12 3/4 1.375 4 UN Thread 5 ALTiN 18
    $479.09

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

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