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12399F18-177 — SCREW,CAP,HEXAGON HEAD

✓ Government record, cited
— · BOLT SCREW
PRODUCT OVERVIEW

12399F18-177: SCREW,CAP,HEXAGON HEAD.

The SCREW,CAP,HEXAGON HEAD is a the manufacturer industrial component. Key specifications include material: STEEL COMP 4140 OR STEEL COMP 4142 OR STEEL COMP 4145 OVERALL, head_style: HEXAGON, head_height: 0.480 INCHES NOMINAL IN, thread_class: 2A A, thread_length: 1.750 INCHES NOMINAL IN, fastener_length: 3.500 INCHES NOMINAL IN. This part is cataloged in the U.S.

Government catalog under NSN 5305-01-362-0716, 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
12399F18-177
NSN: 5305-01-362-0716
FSC: 5305 — Screws
CAGE: 88032 — CURTISS-WRIGHT ELECTRO-MECHANICAL CORPORATION DBA CURTISS WRIGHT ENGINEERED PUMP DIVISION USE CAGE CODE 0UBG9 FOR CATALOGING (USA)
SPECIFICATIONS
materialSTEEL COMP 4140 OR STEEL COMP 4142 OR STEEL COMP 4145 OVERALL
head_styleHEXAGON
head_height0.480 INCHES NOMINAL IN
thread_class2A A
thread_length1.750 INCHES NOMINAL IN
fastener_length3.500 INCHES NOMINAL IN
thread_directionRIGHT-HAND
width_between_flats1.120 INCHES NOMINAL IN
nominal_thread_diameter0.750 INCHES IN
thread_quantity_per_inch10
thread_series_designatorUNIFIED NATIONAL COARSE (UNC)
material_document_and_classificationASTMA193 ASSN STD ALL MATERIAL RESPONSES OVERALL
NSN5305-01-362-0716
COMPONENT DIAGRAM
BOLT / SCREW — THREAD VERIFICATION REQUIRED Hex HEAD LENGTH: — THREAD: — × — MATERIAL: — PN: 12399F18-177 · 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: 0.480 INCHES NOMINAL IN
•
FASTENER LENGTH: 3.500 INCHES NOMINAL IN
•
THREAD LENGTH: 1.750 INCHES NOMINAL IN
•
MATERIAL DOCUMENT AND CLASSIFICATION: ASTMA193 ASSN STD ALL MATERIAL RESPONSES OVERALL
•
NOMINAL THREAD DIAMETER: 0.750 INCHES IN
•
HEAD STYLE: HEXAGON
•
THREAD DIRECTION: RIGHT-HAND
•
WIDTH BETWEEN FLATS: 1.120 INCHES NOMINAL IN
TECHNICAL CHARACTERISTICS
HEAD HEIGHT0.480 INCHES NOMINAL IN
FASTENER LENGTH3.500 INCHES NOMINAL IN
THREAD LENGTH1.750 INCHES NOMINAL IN
MATERIAL DOCUMENT AND CLASSIFICATIONASTMA193 ASSN STD ALL MATERIAL RESPONSES OVERALL
NOMINAL THREAD DIAMETER0.750 INCHES IN
HEAD STYLEHEXAGON
THREAD DIRECTIONRIGHT-HAND
WIDTH BETWEEN FLATS1.120 INCHES NOMINAL IN
THREAD CLASS2A A
THREAD QUANTITY PER INCH10
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
12379C18AReference document
Same NSN cross-reference
Reference document — Design control — primary reference
12379C18Reference document
Same NSN cross-reference
Reference document — Secondary reference
LIFECYCLE
NSN statusActive· U.S. Government catalog
Acquisition advice: Insurance item — stocked against contingency demandNo demilitarization required
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FREQUENTLY ASKED QUESTIONS
What is 12399F18-177?
12399F18-177 is a SCREW,CAP,HEXAGON HEAD.
What parts can replace 12399F18-177?
There are 2 known substitutes for 12399F18-177: 12379C18A, 12379C18. Substitute compatibility should be verified for your specific system.
What is the NSN for 12399F18-177?
12399F18-177 is cataloged in the U.S. Government catalog under NSN 5305-01-362-0716. 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.