PartsTable
Technical Data Sheet

AT445E-4-1/4 — CUTTER,COUNTERSINK

✓ Government record, cited
— · COMPONENT
PRODUCT OVERVIEW

AT445E-4-1/4: CUTTER,COUNTERSINK.

The CUTTER,COUNTERSINK is a the manufacturer industrial component. Key specifications include shank_style: EXTERNALLY THREADED, body_diameter: 0.500 INCHES NOMINAL IN, included_angle: 100.0 DEGREES NOMINAL, pilot_diameter: 0.250 INCHES NOMINAL IN, thread_quantity: 28 PER INCH, cutting_end_style: STRAIGHT FLUTE BLUNT END. This part is cataloged in the U.S.

Government catalog under NSN 5133-01-397-3228, indicating validated use in U.S. government and defense logistics supply chains. Available through authorized enterprise resellers and TPM (Third Party Maintenance) channels.

Verify compatibility with your specific system configuration before ordering.

WHERE IT FITS
AT445E-4-1/4
NSN: 5133-01-397-3228
FSC: 5133 — Drill Bits, Counterbores, and Countersinks: Hand and Machine
CAGE: 00784 — SNAP-ON INCORPORATED DBA SNAP-ON TOOLS DIV SNAP-ON INDUSTRIAL, SPECIAL PRODUCTS DIVISION (USA)
SPECIFICATIONS
shank_styleEXTERNALLY THREADED
body_diameter0.500 INCHES NOMINAL IN
flute_quantity2
included_angle100.0 DEGREES NOMINAL
pilot_diameter0.250 INCHES NOMINAL IN
thread_quantity28 PER INCH
cutting_end_styleSTRAIGHT FLUTE BLUNT END
features_providedINTEGRAL PILOT
nominal_thread_diameter0.250 INCHES IN
thread_series_designatorUNF
nondefinitive_spec/std_data2 TYPE AND A STYLE
NSN5133-01-397-3228
COMPONENT DIAGRAM
COMPONENT MAIN IC EDGE CONNECTOR No detailed specs available CUTTER,COUNTERSINK TITLE COMPONENT PN AT445E-4-1/4 MFR CUTTER,COUNTERSINK
KEY FEATURES
•
BODY DIAMETER: 0.500 INCHES NOMINAL IN
•
CUTTING END STYLE: STRAIGHT FLUTE BLUNT END
•
NOMINAL THREAD DIAMETER: 0.250 INCHES IN
•
FEATURES PROVIDED: INTEGRAL PILOT
•
PILOT DIAMETER: 0.250 INCHES NOMINAL IN
•
NONDEFINITIVE SPEC/STD DATA: 2 TYPE AND A STYLE
•
SHANK STYLE: EXTERNALLY THREADED
•
FLUTE QUANTITY: 2
TECHNICAL CHARACTERISTICS
BODY DIAMETER0.500 INCHES NOMINAL IN
CUTTING END STYLESTRAIGHT FLUTE BLUNT END
NOMINAL THREAD DIAMETER0.250 INCHES IN
FEATURES PROVIDEDINTEGRAL PILOT
PILOT DIAMETER0.250 INCHES NOMINAL IN
NONDEFINITIVE SPEC/STD DATA2 TYPE AND A STYLE
SHANK STYLEEXTERNALLY THREADED
FLUTE QUANTITY2
INCLUDED ANGLE100.0 DEGREES NOMINAL
THREAD SERIES DESIGNATORUNF
SUBSTITUTES & CROSS-REFERENCES 3
ATI445E-4-1/4Same NSN cross-reference
Same NSN cross-reference
Also cataloged under this NSN
A-A-58076 TY2STAReference document
Same NSN cross-reference
Reference document — Secondary reference
A-A-58076Reference document
Same NSN cross-reference
Reference document — Identification reference
LIFECYCLE
NSN statusActive· U.S. Government catalog
Acquisition advice: Normally procured from the manufacturer (OEM)No demilitarization required
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FREQUENTLY ASKED QUESTIONS
What is AT445E-4-1/4?
AT445E-4-1/4 is a CUTTER,COUNTERSINK.
What parts can replace AT445E-4-1/4?
There are 3 known substitutes for AT445E-4-1/4: ATI445E-4-1/4, A-A-58076 TY2STA, A-A-58076. Substitute compatibility should be verified for your specific system.
What is the NSN for AT445E-4-1/4?
AT445E-4-1/4 is cataloged in the U.S. Government catalog under NSN 5133-01-397-3228. This indicates validated use in U.S. government and defense supply chains.
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✓ PartsTable — the parts reference. Every fact cited to its source.
PartsTable Design LLC · partstable.com
U.S. Government catalog: edition PUBLOGDVD v12.0.0 (OCT 2026), edition date 2026-10-01, retrieved 2026-10-18.
PartsTable commercial catalog: edition Unified commercial catalog snapshot through 2026-09-28, edition date not on file, retrieved 2026-09-28.