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Technical Data Sheet
PartsTable / COMPONENT / 1A7653
1A7653 ✓ Verified by PartsTable
— · BOLT SCREW
WHAT YOU NEED TO KNOW
Grade/class stamped on head determines strength Metric and imperial threads look similar — measure pitch
Verify thread pitch — metric != imperial
PRODUCT OVERVIEW

SEAL,METALLIC,AIRCRAFT GAS TURBI. Key specifications include material: STEEL OVERALL, head_style: HEXAGON, head_height: 0.438 INCHES NOMINAL IN, thread_class: 2A A, thread_length: 1.000 INCHES MINIMUM IN, thread_series: UNF COUNTERBORE. This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 5306-00-637-8665, 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
1A7653
NSN: 5306-00-637-8665
FSC: 5306
CAGE: 95201 — NAPCO INTERNATIONAL LLC DBA NAPCO INTERNATIONAL INC (USA)
SPECIFICATIONS
materialSTEEL OVERALL
head_styleHEXAGON
head_height0.438 INCHES NOMINAL IN
thread_class2A A
thread_length1.000 INCHES MINIMUM IN
thread_seriesUNF COUNTERBORE
fastener_length2.875 INCHES NOMINAL IN
shoulder_length0.438 INCHES NOMINAL IN
special_featuresFURNISHED WITH 1.250 IN. DIA WASHER FACE ON HEAD 0.031 IN. THICK AND 0.062 IN W UNDERCUT 0.010 IN. DEEP BETWEEN HEAD AND SHOULDER IN
style_designatorCOUNTERBORE THREADED
thread_directionRIGHT-HAND
threads_per_inch18 COUNTERBORE
NSN5306-00-637-8665
COMPONENT DIAGRAM
BOLT / SCREW — THREAD VERIFICATION REQUIRED Hex HEAD LENGTH: — THREAD: — × — MATERIAL: — PN: 1A7653 · OEM ⚠ VERIFY BEFORE ORDERING Verify thread pitch before ordering — metric (M8×1.25) ≠ imperial (5/16-18). Wrong thread = wrong part. Grade/class stamped on bolt head determines tensile strength ✓ BROKER TIP Grade/class stamped on head determines tensile strength. Grade 8 > Grade 5 > Grade 2. Always confirm head marking matches specification requirement PARTSTABLE TECHNICAL DRAWING — NOT TO SCALE
KEY FEATURES
•
SHOULDER LENGTH: 0.438 INCHES NOMINAL IN
•
MATERIAL: STEEL OVERALL
•
NOMINAL THREAD DIAMETER: 0.750 INCHES IN
•
THREAD QUANTITY PER INCH: 10
•
HEAD STYLE: HEXAGON
•
THREADS PER INCH: 18 COUNTERBORE
•
STYLE DESIGNATOR: COUNTERBORE THREADED
•
WIDTH BETWEEN FLATS: 1.188 INCHES MINIMUM AND 1.375 INCHES MAXIMUM IN
TECHNICAL CHARACTERISTICS (FLIS)
SHOULDER LENGTH0.438 INCHES NOMINAL IN
MATERIALSTEEL OVERALL
NOMINAL THREAD DIAMETER0.750 INCHES IN
THREAD QUANTITY PER INCH10
HEAD STYLEHEXAGON
THREADS PER INCH18 COUNTERBORE
STYLE DESIGNATORCOUNTERBORE THREADED
WIDTH BETWEEN FLATS1.188 INCHES MINIMUM AND 1.375 INCHES MAXIMUM IN
THREAD LENGTH1.000 INCHES MINIMUM IN
THREAD SERIESUNF COUNTERBORE
VERIFIED SUBSTITUTES & CROSS-REFERENCES 21
11735Upgraded Successor
successor cross-reference
successor
6540NCM071416Upgraded Successor
successor cross-reference
successor
2579-4Interchangeable
interchangeable cross-reference
interchangeable
514467-1Interchangeable
interchangeable cross-reference
interchangeable
10S9131135Interchangeable
interchangeable cross-reference
interchangeable
112-536Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusCANCELLED
Availability—
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is 1A7653?
1A7653 is a SEAL,METALLIC,AIRCRAFT GAS TURBI.
What parts can replace 1A7653?
There are 21 known substitutes for 1A7653: 11735, 6540NCM071416, 2579-4 and 18 more. Substitute compatibility should be verified for your specific system.
Is 1A7653 still available?
1A7653 is currently cancelled.
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✓ Validated with multiple authoritative sources, including Government, OEM, and Certified sources.
PartsTable Design LLC · partstable.com
Last verified: July 2026