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ST3M557-7-14 — SCREW,CLOSE TOLERANCE

✓ Government record, cited
— · BOLT SCREW
PRODUCT OVERVIEW

ST3M557-7-14: SCREW,CLOSE TOLERANCE.

The SCREW,CLOSE TOLERANCE is a the manufacturer industrial component. Key specifications include material: NICKEL ALLOY 718 OVERALL, head_style: FLAT COUNTERSUNK UNDERCUT, grip_length: 0.875 INCHES NOMINAL IN, head_height: 0.101 INCHES NOMINAL IN, thread_class: 3A A, grip_diameter: 0.4365 INCHES MINIMUM AND 0.4370 INCHES MAXIMUM IN. This part is cataloged in the U.S.

Government catalog under NSN 5305-01-514-0506, 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
ST3M557-7-14
NSN: 5305-01-514-0506
FSC: 5305 — Screws
CAGE: 76301 — THE BOEING COMPANY DIV DEFENSE (USA)
SPECIFICATIONS
materialNICKEL ALLOY 718 OVERALL
head_styleFLAT COUNTERSUNK UNDERCUT
grip_length0.875 INCHES NOMINAL IN
head_height0.101 INCHES NOMINAL IN
thread_class3A A
grip_diameter0.4365 INCHES MINIMUM AND 0.4370 INCHES MAXIMUM IN
head_diameter0.612 INCHES MINIMUM AND 0.672 INCHES MAXIMUM IN
thread_length0.656 INCHES NOMINAL IN
fastener_length1.546 INCHES NOMINAL IN
thread_directionRIGHT-HAND
countersink_angle99.0 DEGREES MINIMUM AND 101.0 DEGREES MAXIMUM
surface_treatmentPASSIVATE OVERALL
NSN5305-01-514-0506
COMPONENT DIAGRAM
BOLT / SCREW — THREAD VERIFICATION REQUIRED Hex HEAD LENGTH: — THREAD: — × — MATERIAL: — PN: ST3M557-7-14 · 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
•
HEAD HEIGHT: 0.101 INCHES NOMINAL IN
•
FASTENER LENGTH: 1.546 INCHES NOMINAL IN
•
SURFACE TREATMENT DOCUMENT AND CLASSIFICATION: QQ-P-35 FED SPEC SINGLE TREATMENT RESPONSE OVERALL
•
THREAD LENGTH: 0.656 INCHES NOMINAL IN
•
NOMINAL THREAD DIAMETER: 0.4375 INCHES IN
•
HEAD STYLE: FLAT COUNTERSUNK UNDERCUT
•
THREAD DIRECTION: RIGHT-HAND
•
GRIP LENGTH: 0.875 INCHES NOMINAL IN
TECHNICAL CHARACTERISTICS
HEAD HEIGHT0.101 INCHES NOMINAL IN
FASTENER LENGTH1.546 INCHES NOMINAL IN
SURFACE TREATMENT DOCUMENT AND CLASSIFICATIONQQ-P-35 FED SPEC SINGLE TREATMENT RESPONSE OVERALL
THREAD LENGTH0.656 INCHES NOMINAL IN
NOMINAL THREAD DIAMETER0.4375 INCHES IN
HEAD STYLEFLAT COUNTERSUNK UNDERCUT
THREAD DIRECTIONRIGHT-HAND
GRIP LENGTH0.875 INCHES NOMINAL IN
GRIP DIAMETER0.4365 INCHES MINIMUM AND 0.4370 INCHES MAXIMUM IN
SURFACE TREATMENTPASSIVATE OVERALL
OTHER ITEMS IN FSC 5305 — Screws
Items in the same Federal Supply class. No interchangeability or substitution relationship is implied.
5305-00-001-5016 5305-00-001-9160 5305-00-001-9629 5305-00-001-9742 5305-00-001-9768 5305-00-003-4306 5305-00-003-6694 5305-00-003-6753
SUBSTITUTES & CROSS-REFERENCES 2
HT4027-7-14Same NSN cross-reference
Same NSN cross-reference
Also cataloged under this NSN
WC4027-7-14Same NSN cross-reference
Same NSN cross-reference
Also cataloged under this NSN
LIFECYCLE
NSN statusActive· U.S. Government catalog
No demilitarization required
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FREQUENTLY ASKED QUESTIONS
What is ST3M557-7-14?
ST3M557-7-14 is a SCREW,CLOSE TOLERANCE.
What parts can replace ST3M557-7-14?
There are 2 known substitutes for ST3M557-7-14: HT4027-7-14, WC4027-7-14. Substitute compatibility should be verified for your specific system.
What is the NSN for ST3M557-7-14?
ST3M557-7-14 is cataloged in the U.S. Government catalog under NSN 5305-01-514-0506. 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.