ATI444 SERIES, Microstops

ATI441 Series Premium Microstops have been superceeded with the new ATI444 Series Microstops.

Part number conversion chart below. Old numbers shown with 'ATI' prefix. 'AT' prefixes also apply accordingly.

  • For high volume, accurate countersinking in a production environment.
  • Full ball bearing shaft support for increased life.
  • Heavy duty ball thrust bearing ensures depth repeatability.
  • Fail-safe design accomplished with integrated shoulder on shaft.
  • Debris filter prevents chips and dust from contaminating bearings.
  • .0005" depth adjustment
  • 5/16" shaft travel
  • Right-hand threaded lock nut prevents jamming of adjustment mechanism.
  • Multiple skirt configuration options.
  • Multiple shaft configuration options.

Recognized throughout the industry as a leading producer of quality cutting tools, ATI Tools give the industry tools that are designed for high-rate production in the full range of metals used in aircraft manufacturing and maintenance.

The tools contained in this section are made of the finest tool steel and carbides. The cutters are carefully heat-treated, precision ground for correct cutting angles and proper clearance, then thoroughly checked to ensure accurate cutting without chatter. After final inspection, all tools are dipped in a protective plastic coating for shipment and storage.

A variety of microstop countersink units and accessories have been designed to present a versatile selection of tools for all working surfaces and areas.

OLD MICROSTOP NUMBER NEW MICROSTOP NUMBER DESCRIPTION
ATI441HSS, ATI441HSGS05 ATI444S1 MICROSTOP ASSY-BALL-STD-.0005-RD SHAFT
ATI441HSBS, ATI441HSBS05, ATI441HSBS5 ATI444S2 MICROSTOP ASSY-BALL-STD-.0005-3F SHAFT 
ATI441HSBQS ATI444S3 MICROSTOP ASSY-BALL-STD-.0005-QC SHAFT 
ATI441HSS-M6 ATI444S4 MICROSTOP ASSY-BALL-STD-.0005-M6 SHAFT 
ATI441HSA ATI444A1 MICROSTOP ASSY-BALL-INS CL-.0005-RD SHAFT
ATI441HSBA ATI444A2 MICROSTOP ASSY-BALL-INS CL-.0005-3F SHAFT
ATI441HSA-M6 ATI444A4 MICROSTOP ASSY-BALL-INS CL-.0005-M6 SHAFT
ATI441HSB ATI444B1  MICROSTOP ASSY-BALL-2LG-.0005-RD SHAFT
ATI441HSBB ATI444B2  MICROSTOP ASSY-BALL-2LG-.0005-3F SHAFT
ATI441HSC ATI444C1  MICROSTOP ASSY-BALL-CLSD-.0005-RD SHAFT
ATI441HSD ATI444D1  MICROSTOP ASSY-BALL-BELL-.0005-RD SHAFT
ATI441HSBD ATI444D2  MICROSTOP ASSY-BALL-BELL.0005-3F SHAFT
ATI441HSE ATI444E1  MICROSTOP ASSY-BALL-CUT-0005-RD SHAFT
ATI441HSBE ATI444E2  MICROSTOP ASSY-BALL-CUT-.0005-3F SHAFT
ATI441HSF ATI444F1  MICROSTOP ASSY-BALL-FLG-.0005-RD SHAFT
ATI441HSBF, ATI441HSBF-5 ATI444F2  MICROSTOP ASSY-BALL-FLG-.0005-3F SHAFT
ATI441HSBQF, ATI441HSBQF5 ATI444F3  MICROSTOP ASSY-BALL-FLG-.0005-QC SHAFT
ATI441HSAW13 ATI444N1  MICROSTOP ASSY-BALL-INS CL NYL-.0005-RD SHAFT
ATI441HSBA13 ATI444N2  MICROSTOP ASSY-BALL-INS CL NYL-.0005-3F SHAFT
ATI441HSAA13 ATI444N4  MICROSTOP ASSY-BALL-INS CL NYL-.0005-M6 SHAFT
ATI441SAW14 ATI444H1  MICROSTOP ASSY-BALL-INS CL FLG-.0005-RD SHAFT
ATI441HSBA14 ATI444H2  MICROSTOP ASSY-BALL-INS CL FLG-.0005-3F SHAFT
ATI441HSAA14 ATI444H4  MICROSTOP ASSY-BALL-INS CL FLG-.0005-M6 SHAFT
ATI441HSSPCA, ATI441HSBSA5 ATI444LA1  MICROSTOP ASSY-BALL-EXT SKT A-.0005-RD SHAFT
ATI441HSSPCB ATI444LB1  MICROSTOP ASSY-BALL-EXT SKT B-.0005-RD SHAFT
ATI441HSSPCC, ATI441HSBSC5 ATI444LC1  MICROSTOP ASSY-BALL-EXT SKT C-.0005-RD SHAFT
ATI441HSBC5F ATI444LC2  MICROSTOP ASSY-BALL-EXT SKT C-.0005-3F SHAFT
ATI441HSSPCD ATI444LD1  MICROSTOP ASSY-BALL-EXT SKT D-.0005-RD SHAFT
ATI441332532 ATI444J1  MICROSTOP ASSY-BALL-332-532-.0005-3F SHAFT
ATI441400600 ATI444K1  MICROSTOP ASSY-BALL-400-600-.0005-3F SHAFT
ATI441HSW ATI444W1  MICROSTOP ASSY-BALL-BELL FLG-.0005-RD SHAFT
ATI441HSBW ATI444W2  MICROSTOP ASSY-BALL-BELL FLG-.0005-3F SHAFT

 

PART # SKIRT DESCRIPTION
SKIRT CAPACITY SHAFT THREAD SHAFT SHANK
ATI444A1 PHENOLIC INSERT 3/4" 1/4-28 FEMALE 1/4" ROUND
ATI444A2 PHENOLIC INSERT 3/4" 1/4-28 FEMALE 3 CHUCK FLATS
ATI444A3 PHENOLIC INSERT 3/4" 1/4-28 FEMALE QUICK CHANGE
ATI444B1 2-LEGGED 3/4" 1/4-28 FEMALE 1/4" ROUND
ATI444B2 2-LEGGED 3/4" 1/4-28 FEMALE 3 CHUCK FLATS
ATI444B3 2-LEGGED 3/4" 1/4-28 FEMALE QUICK CHANGE
ATI444C1 CLOSE 5/16" 1/4-28 FEMALE 1/4" ROUND
ATI444C2 CLOSE 5/16" 1/4-28 FEMALE 3 CHUCK FLATS
ATI444C3 CLOSE 5/16" 1/4-28 FEMALE QUICK CHANGE
ATI444D1 BELL 1" 1/4-28 FEMALE 1/4" ROUND
ATI444D2 BELL 1" 1/4-28 FEMALE 3 CHUCK FLATS
ATI444D3 BELL 1" 1/4-28 FEMALE QUICK CHANGE
ATI444E1 STRAIGHT CUTAWAY 3/4" 1/4-28 FEMALE 1/4" ROUND
ATI444E2 STRAIGHT CUTAWAY 3/4" 1/4-28 FEMALE 3 CHUCK FLATS
ATI444E3 STRAIGHT CUTAWAY 3/4" 1/4-28 FEMALE QUICK CHANGE
ATI444F1 FLANGED 3/4" 1/4-28 FEMALE 1/4" ROUND
ATI444F2 FLANGED 3/4" 1/4-28 FEMALE 3 CHUCK FLATS
ATI444F3 FLANGED 3/4" 1/4-28 FEMALE QUICK CHANGE
ATI444G1 FLANGED CUTAWAY 3/4" 1/4-28 FEMALE 1/4" ROUND
ATI444G2 FLANGED CUTAWAY 3/4" 1/4-28 FEMALE 3 CHUCK FLATS
ATI444G3 FLANGED CUTAWAY 3/4" 1/4-28 FEMALE QUICK CHANGE
ATI444H1 NYLON FLANGE INSERT 3/4" 1/4-28 FEMALE 1/4" ROUND
ATI444H2 NYLON FLANGE INSERT 3/4" 1/4-28 FEMALE 3 CHUCK FLATS
ATI444H3 NYLON FLANGE INSERT 3/4" 1/4-28 FEMALE QUICK CHANGE
ATI444J1 .532 OD .332 1/4-28 FEMALE 1/4" ROUND
ATI444K1 .600 OD .400 1/4-28 FEMALE 1/4" ROUND
ATI444LA1 2-3/4" EXTENSION, 3/8" OD 1/4" 10-32 FEMALE 1/4" ROUND
ATI444LA2 2-3/4" EXTENSION, 3/8" OD 1/4" 10-32 FEMALE 3 CHUCK FLATS
ATI444LB1 2-3/4" EXTENSION, 7/16" OD 5/16" 1/4-28 FEMALE 1/4" ROUND
ATI444LB2 2-3/4" EXTENSION, 7/16" OD 5/16" 1/4-28 FEMALE 3 CHUCK FLATS
ATI444LC1 2-3/4" EXTENSION, 1/2" OD 3/8" 1/4-28 FEMALE 1/4" ROUND
ATI444LC2 2-3/4" EXTENSION, 1/2" OD 3/8" 1/4-28 FEMALE 3 CHUCK FLATS
ATI444LD1 2-3/4" EXTENSION, 3/4" OD 5/8" 1/4-28 FEMALE 1/4" ROUND
ATI444LD2 2-3/4" EXTENSION, 3/4" OD 5/8" 1/4-28 FEMALE 3 CHUCK FLATS
ATI444N1 NYLON INSERT 3/4" 1/4-28 FEMALE 1/4" ROUND
ATI444N2 NYLON INSERT 3/4" 1/4-28 FEMALE 3 CHUCK FLATS
ATI444N3 NYLON INSERT 3/4" 1/4-28 FEMALE QUICK CHANGE
ATI444S1 STRAIGHT 3/4" 1/4-28 FEMALE 1/4" ROUND
ATI444S2 STRAIGHT 3/4" 1/4-28 FEMALE 3 CHUCK FLATS
ATI444S3 STRAIGHT 3/4" 1/4-28 FEMALE QUICK CHANGE
ATI444W1 FLANGED BELL 1" 1/4-28 FEMALE 1/4" ROUND
ATI444W2 FLANGED BELL 1" 1/4-28 FEMALE 3 CHUCK FLATS
ATI444W3 FLANGED BELL 1" 1/4-28 FEMALE QUICK CHANGE

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  1. ATI444A1

    ATI444A1

    $61.87

    • ATI444A1
    • Supercedes ATI441HSA / AT441HSA
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  2. ATI444A2

    ATI444A2

    $61.96

    • ATI444A2
    • Supercedes ATI441HSBA / AT441HSBA
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  3. ATI444A3

    ATI444A3

    $63.69

    • ATI444A3
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  4. ATI444B1

    ATI444B1

    $63.69

    • ATI444B1
    • Supercedes ATI441HSB / AT441HSB
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  5. ATI444B2

    ATI444B2

    $64.33

    • ATI444B2
    • Supercedes ATI441HSBB / AT441HSBB
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  6. ATI444B3

    ATI444B3

    $63.69

    • ATI444B3
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  7. ATI444C1

    ATI444C1

    $63.69

    • ATI444C1
    • Supercedes ATI441HSC / AT441HSC
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  8. ATI444C2

    ATI444C2

    $64.33

    • ATI444C2
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  9. ATI444C3

    ATI444C3

    $63.69

    • ATI444C3
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  10. ATI444D1

    ATI444D1

    $63.69

    • ATI444D1
    • Supercedes ATI441HSD / AT441HSD
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  11. ATI444D2

    ATI444D2

    $64.33

    • ATI444D2
    • Supercedes ATI441HSBD / AT441HSBD
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  12. ATI444D3

    ATI444D3

    $63.69

    • ATI444D3
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  13. ATI444E1

    ATI444E1

    $63.69

    • ATI444E1
    • Supercedes ATI441HSE / AT441HSE
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  14. ATI444E2

    ATI444E2

    $64.33

    • ATI444E2
    • Supercedes ATI441HSBE / AT441HSBE
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  15. ATI444E3

    ATI444E3

    $63.69

    • ATI444E3
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  16. ATI444F1

    ATI444F1

    $59.38

    • ATI444F1
    • Supercedes ATI441HSF / AT441HSF
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  17. ATI444F2

    ATI444F2

    $59.38

    • ATI444F2
    • Supercedes ATI441HSBF / AT441HSBF
    • Supercedes ATI441HSBF-5 / AT441HSBF-5
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  18. ATI444F3

    ATI444F3

    $61.09

    • ATI444F3
    • Supercedes ATI441HSBQF / AT441HSBQF
    • Supercedes ATI441HSBQF5 / AT441HSBQF-5
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  19. ATI444G1

    ATI444G1

    $63.69

    • ATI444G1
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  20. ATI444G2

    ATI444G2

    $63.69

    • ATI444G2
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  21. ATI444G3

    ATI444G3

    $63.69

    • ATI444G3
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  22. ATI444H1

    ATI444H1

    $63.69

    • ATI444H1
    • Supercedes ATI441HSAW14 / AT441HSAW14
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  23. ATI444H2

    ATI444H2

    $63.69

    • ATI444H2
    • Supercedes ATI441HSBA14 / AT441HSBA14
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  24. ATI444H3

    ATI444H3

    $63.69

    • ATI444H3
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