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NAS8603-9 — SCREW,CLOSE TOLERANCE

✓ Government record, cited
— · BOLT SCREW
PRODUCT OVERVIEW

NAS8603-9: SCREW,CLOSE TOLERANCE.

The SCREW,CLOSE TOLERANCE is a the manufacturer industrial component. Key specifications include material: STEEL COMP 4340 AND STEEL COMP 8740 OVERALL, head_style: FLAT COUNTERSUNK, grip_length: 0.562 INCHES NOMINAL IN, point_style: FLAT, thread_class: 3A A, grip_diameter: 0.1885 INCHES MINIMUM AND 0.1895 INCHES MAXIMUM IN. This part is cataloged in the U.S.

Government catalog under NSN 5305-01-680-5937, 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
NAS8603-9
NSN: 5305-01-680-5937
FSC: 5305 — Screws
CAGE: 1TBU5 — GENUINE AIRCRAFT HARDWARE CO (USA)
SPECIFICATIONS
materialSTEEL COMP 4340 AND STEEL COMP 8740 OVERALL
head_styleFLAT COUNTERSUNK
grip_length0.562 INCHES NOMINAL IN
point_styleFLAT
thread_class3A A
grip_diameter0.1885 INCHES MINIMUM AND 0.1895 INCHES MAXIMUM IN
head_diameter0.266 INCHES MINIMUM AND 0.303 INCHES MAXIMUM IN
thread_length0.323 INCHES NOMINAL IN
fastener_length0.885 INCHES NOMINAL IN
thread_directionRIGHT-HAND
countersink_angle99.0 DEGREES MINIMUM AND 101.00 DEGREES MAXIMUM
surface_treatmentCADMIUM OVERALL
NSN5305-01-680-5937
COMPONENT DIAGRAM
BOLT / SCREW — THREAD VERIFICATION REQUIRED Hex HEAD LENGTH: — THREAD: — × — MATERIAL: — PN: NAS8603-9 · 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
•
FASTENER LENGTH: 0.885 INCHES NOMINAL IN
•
THREAD LENGTH: 0.323 INCHES NOMINAL IN
•
SHANK UNTHREADED HOLE DIAMETER: 0.070 INCHES NOMINAL OVERALL IN
•
NOMINAL THREAD DIAMETER: 0.1900 INCHES IN
•
HEAD STYLE: FLAT COUNTERSUNK
•
THREAD DIRECTION: RIGHT-HAND
•
POINT STYLE: FLAT
•
SPECIFICATION/STANDARD DATA: 80205-NAS8603 PROFESSIONAL/INDUSTRIAL ASSOCIATION STANDARD
TECHNICAL CHARACTERISTICS
FASTENER LENGTH0.885 INCHES NOMINAL IN
THREAD LENGTH0.323 INCHES NOMINAL IN
SHANK UNTHREADED HOLE DIAMETER0.070 INCHES NOMINAL OVERALL IN
NOMINAL THREAD DIAMETER0.1900 INCHES IN
HEAD STYLEFLAT COUNTERSUNK
THREAD DIRECTIONRIGHT-HAND
POINT STYLEFLAT
SPECIFICATION/STANDARD DATA80205-NAS8603 PROFESSIONAL/INDUSTRIAL ASSOCIATION STANDARD
GRIP LENGTH0.562 INCHES NOMINAL IN
GRIP DIAMETER0.1885 INCHES MINIMUM AND 0.1895 INCHES MAXIMUM IN
SUBSTITUTES & CROSS-REFERENCES 1
NAS8603Reference document
Same NSN cross-reference
Reference document — Secondary reference
LIFECYCLE
NSN statusActive· U.S. Government catalog
No demilitarization required
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FREQUENTLY ASKED QUESTIONS
What is NAS8603-9?
NAS8603-9 is a SCREW,CLOSE TOLERANCE.
What parts can replace NAS8603-9?
There is 1 known substitute for NAS8603-9: NAS8603. Substitute compatibility should be verified for your specific system.
What is the NSN for NAS8603-9?
NAS8603-9 is cataloged in the U.S. Government catalog under NSN 5305-01-680-5937. 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.