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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