Spiral Flute - Semi Bottoming

Spiral Flute - Semi Bottoming

Atlas High Speed Steel (HSS) Spiral Flute - Semi Bottoming

General Purpose - Spiral Flute - Semi Bottoming - High Speed Steel

  • Optimized for relatively deep hole tapping in copper, brass, aluminum, and other soft ductile materials
  • ZrN coating offers increased speed rates and prolonged tool life
  • 52° Helix
  • Slightly longer chamfer distributes cutting over greater number of teeth for increased production
  • Can be used for plug or bottoming applications
  • Made in the USA

Speeds and Feed Info

Have a question or need help?

Call Customer Service at 908-98-ATLAS or email: Sales@atlascuttingtools.com
  • Compare SKU Vendor Size Shank Diameter Overall Length H Limit D Limit NC / NF Square Size Square Length Thread Length Number of Lube Grooves Number of Flutes Style Material Coating In Stock Price Quantity
    A55821 ACT 1/4-20 0.255 2-1/2 H3 3 High Spiral HSS Uncoated 73
    $18.43
  • A55822 ACT 1/4-28 0.255 2-1/2 H3 3 High Spiral HSS Uncoated 22
    $18.43
  • A77354 ACT 1/4-20 0.2550 2-1/2 H3 3 Semi Bottom HSS ZRN Available to Order*
    $23.44
  • A77355 ACT 1/4-28 0.2550 2-1/2 H3 3 Semi Bottom HSS ZRN Available to Order*
    $26.37
  • A55823 ACT 5/16-18 0.318 2-23/32 H3 3 High Spiral HSS Uncoated 4
    $23.05
  • A55824 ACT 5/16-24 0.318 2-23/32 H3 3 High Spiral HSS Uncoated 46
    $23.05
  • A77356 ACT 5/16-18 0.3180 2.7188" H3 3 Semi Bottom HSS ZRN Available to Order*
    $28.80
  • A77357 ACT 5/16-24 0.3180 2.7188" H3 3 Semi Bottom HSS ZRN Available to Order*
    $30.17
  • A55825 ACT 3/8-16 0.381 2-15/16 H3 3 High Spiral HSS Uncoated 36
    $26.56
  • A55826 ACT 3/8-24 0.381 2-15/16 H3 3 High Spiral HSS Uncoated 23
    $26.56
  • A77358 ACT 3/8-16 0.3810 2-15/16 H3 3 Semi Bottom HSS ZRN Available to Order*
    $33.22
  • A77359 ACT 3/8-24 0.3810 2-15/16 H3 3 Semi Bottom HSS ZRN Available to Order*
    $37.25
  • A55827 ACT 7/16-14 0.323 3-5/32 H3 3 High Spiral HSS Uncoated 19
    $39.83
  • A55828 ACT 7/16-20 0.323 3-5/32 H3 3 High Spiral HSS Uncoated 22
    $39.83
  • A77360 ACT 7/16-14 0.3230 3.1563" H3 3 Semi Bottom HSS ZRN Available to Order*
    $46.16
  • A77361 ACT 7/16-20 0.3230 3.1563" H3 3 Semi Bottom HSS ZRN Available to Order*
    $46.16
  • A55829 ACT 1/2-13 0.367 3-3/8 H3 3 High Spiral HSS Uncoated 14
    $47.54
  • A55830 ACT 1/2-20 0.367 3-3/8 H3 3 High Spiral HSS Uncoated 24
    $47.54
  • A77362 ACT 1/2-13 0.3670 3-3/8 H3 3 Semi Bottom HSS ZRN Available to Order*
    $56.71
  • A77363 ACT 1/2-20 0.3670 3-3/8 H3 3 Semi Bottom HSS ZRN Available to Order*
    $56.71
  • A55831 ACT 9/16-12 0.429 3-19/32 H3 4 High Spiral HSS Uncoated 29
    $79.29
  • A55832 ACT 9/16-18 0.429 3-19/32 H3 4 High Spiral HSS Uncoated 17
    $79.29
  • A77364 ACT 9/16-12 0.4290 3.5938" H3 4 Semi Bottom HSS ZRN Available to Order*
    $83.70
  • A77365 ACT 9/16-18 0.4290 3.5938" H3 4 Semi Bottom HSS ZRN Available to Order*
    $83.70
  • A55833 ACT 5/8-11 0.48 3-13/16 H3 4 High Spiral HSS Uncoated 22
    $104.07
  • A55834 ACT 5/8-18 0.48 3-13/16 H3 4 High Spiral HSS Uncoated 49
    $104.07
  • A77366 ACT 5/8-11 0.4800 3-13/16 H3 4 Semi Bottom HSS ZRN Available to Order*
    $108.93
  • A77367 ACT 5/8-18 0.4800 3-13/16 H3 4 Semi Bottom HSS ZRN Available to Order*
    $108.93
  • A55835 ACT 3/4-10 0.59 4-1/4 H3 4 High Spiral HSS Uncoated 23
    $133.14
  • A55836 ACT 3/4-16 0.59 4-1/4 H3 4 High Spiral HSS Uncoated 21
    $133.14
  • A77368 ACT 3/4-10 0.5900 4-1/4 H3 4 Semi Bottom HSS ZRN Available to Order*
    $146.89
  • A55807 ACT 3-48 0.141 1-13/16 H2 2 High Spiral HSS Uncoated 20
    $25.65
  • A55808 ACT 3-56 0.141 1-13/16 H2 2 High Spiral HSS Uncoated 16
    $25.65
  • A77420 ACT 3-48 0.1410 1-13/16 H2 2 Semi Bottom HSS ZRN Available to Order*
    $30.17
  • A77421 ACT 3-56 0.1410 1-13/16 H2 2 Semi Bottom HSS ZRN Available to Order*
    $30.17
  • A55809 ACT 4-40 0.141 1-7/8 H2 2 High Spiral HSS Uncoated 31
    $21.11
  • A55810 ACT 4-48 0.141 1-7/8 H2 2 High Spiral HSS Uncoated 41
    $21.11
  • A77342 ACT 4-40 0.1410 1-7/8 H2 2 Semi Bottom HSS ZRN Available to Order*
    $25.91
  • A77343 ACT 4-48 0.1410 1-7/8 H2 2 Semi Bottom HSS ZRN Available to Order*
    $25.91
  • A55811 ACT 5-40 0.141 1-15/16 H3 2 High Spiral HSS Uncoated 12
    $21.11
  • A55812 ACT 5-44 0.141 1-15/16 H3 2 High Spiral HSS Uncoated 9
    $21.07
  • A77344 ACT 5-40 0.1410 1-15/16 H3 2 Semi Bottom HSS ZRN Available to Order*
    $25.91
  • A77345 ACT 5-44 0.1410 1-15/16 H3 2 Semi Bottom HSS ZRN Available to Order*
    $24.23
  • A55813 ACT 6-32 0.141 2 H3 2 High Spiral HSS Uncoated 60
    $17.12
  • A55814 ACT 6-40 0.14 2 H3 2 High Spiral HSS Uncoated 100
    $17.12
  • A77346 ACT 6-32 0.1410 2 H3 2 Semi Bottom HSS ZRN Available to Order*
    $21.60
  • A77347 ACT 6-40 0.1410 2 H3 2 Semi Bottom HSS ZRN Available to Order*
    $22.06
  • A55815 ACT 8-32 0.168 2-1/8 H3 3 High Spiral HSS Uncoated 40
    $17.12
  • A55816 ACT 8-36 0.168 2-1/8 H3 3 High Spiral HSS Uncoated 21
    $17.12
  • A77348 ACT 8-32 0.1680 2-1/8 H3 3 Semi Bottom HSS ZRN Available to Order*
    $21.60
  • A77349 ACT 8-36 0.1680 2-1/8 H3 3 Semi Bottom HSS ZRN Available to Order*
    $21.60
  • A55817 ACT 10-24 0.194 2-3/8 H3 3 High Spiral HSS Uncoated 34
    $17.12
  • A55818 ACT 10-32 0.194 2-3/8 H3 3 High Spiral HSS Uncoated 50
    $17.12
  • A77350 ACT 10-24 0.1940 2-3/8 H3 3 Semi Bottom HSS ZRN Available to Order*
    $21.60
  • A77351 ACT 10-32 0.1940 2-3/8 H3 3 Semi Bottom HSS ZRN Available to Order*
    $21.60
  • A55819 ACT 12-24 0.22 2-3/8 H3 3 High Spiral HSS Uncoated 100
    $18.43
  • A55820 ACT 12-28 0.22 2-3/8 H3 3 High Spiral HSS Uncoated 20
    $18.43
  • A77352 ACT 12-24 0.2200 2-3/8 H3 3 Semi Bottom HSS ZRN Available to Order*
    $24.99
  • A77353 ACT 12-28 0.2200 2-3/8 H3 3 Semi Bottom HSS ZRN Available to Order*
    $24.99

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

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