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PartsTable / COMPONENT / 845-4558721 ITEM 10
845-4558721 ITEM 10 ✓ 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

The SCREW,CAP,SOCKET HEAD is a the manufacturer industrial component. Key specifications include material: NICKEL ALLOY R-405 OR NICKEL ALLOY 400 OVERALL, head_style: FLAT COUNTERSUNK, thread_class: 3A A, head_diameter: 1.251 INCHES MINIMUM AND 1.375 INCHES MAXIMUM IN, thread_length: 2.050 INCHES NOMINAL IN, fastener_length: 2.250 INCHES NOMINAL IN. This product is currently in active production with full OEM support.

This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 5305-01-324-8860, 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
845-4558721 ITEM 10
NSN: 5305-01-324-8860
FSC: 5305
CAGE: 80064 — NAVAL SHIP SYSTEMS COMMAND (USA)
SPECIFICATIONS
materialNICKEL ALLOY R-405 OR NICKEL ALLOY 400 OVERALL
head_styleFLAT COUNTERSUNK
thread_class3A A
head_diameter1.251 INCHES MINIMUM AND 1.375 INCHES MAXIMUM IN
thread_length2.050 INCHES NOMINAL IN
fastener_length2.250 INCHES NOMINAL IN
thread_directionRIGHT-HAND
countersink_angle82.0 DEGREES NOMINAL
width_across_flats0.625 INCHES NOMINAL IN
internal_drive_styleHEXAGON
nominal_thread_diameter0.750 INCHES IN
thread_quantity_per_inch10
NSN5305-01-324-8860
COMPONENT DIAGRAM
BOLT / SCREW — THREAD VERIFICATION REQUIRED Hex HEAD LENGTH: — THREAD: — × — MATERIAL: — PN: 845-4558721 ITEM 10 · 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
•
THREAD LENGTH: 2.050 INCHES NOMINAL IN
•
THREAD QUANTITY PER INCH: 10
•
THREAD SERIES DESIGNATOR: UNIFIED NATIONAL COARSE (UNC)
•
MATERIAL DOCUMENT AND CLASSIFICATION: QQ-N-281 FED SPEC ALL MATERIAL RESPONSES OVERALL
•
THREAD CLASS: 3A A
•
HEAD STYLE: FLAT COUNTERSUNK
•
INTERNAL DRIVE STYLE: HEXAGON
•
WIDTH ACROSS FLATS: 0.625 INCHES NOMINAL IN
TECHNICAL CHARACTERISTICS (FLIS)
THREAD LENGTH2.050 INCHES NOMINAL IN
THREAD QUANTITY PER INCH10
THREAD SERIES DESIGNATORUNIFIED NATIONAL COARSE (UNC)
MATERIAL DOCUMENT AND CLASSIFICATIONQQ-N-281 FED SPEC ALL MATERIAL RESPONSES OVERALL
THREAD CLASS3A A
HEAD STYLEFLAT COUNTERSUNK
INTERNAL DRIVE STYLEHEXAGON
WIDTH ACROSS FLATS0.625 INCHES NOMINAL IN
THREAD DIRECTIONRIGHT-HAND
FASTENER LENGTH2.250 INCHES NOMINAL IN
VERIFIED SUBSTITUTES & CROSS-REFERENCES 12
NASM24671-78Interchangeable
interchangeable cross-reference
interchangeable
MS24671-78Interchangeable
interchangeable cross-reference
interchangeable
FF-S-86 TYPE IVInterchangeable
interchangeable cross-reference
interchangeable
51480Interchangeable
interchangeable cross-reference
interchangeable
100A905078Interchangeable
interchangeable cross-reference
interchangeable
92197A244Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusACTIVE
AvailabilityOEM and secondary market
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is 845-4558721 ITEM 10?
845-4558721 ITEM 10 is a SCREW,CAP,SOCKET HEAD.
What parts can replace 845-4558721 ITEM 10?
There are 12 known substitutes for 845-4558721 ITEM 10: NASM24671-78, MS24671-78, FF-S-86 TYPE IV and 9 more. Substitute compatibility should be verified for your specific system.
What is the NSN for 845-4558721 ITEM 10?
845-4558721 ITEM 10 is cataloged in the Federal Logistics Information System (FLIS) under NSN 5305-01-324-8860. This indicates validated use in U.S. government and defense supply chains.
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✓ Validated with multiple authoritative sources, including Government, OEM, and Certified sources.
PartsTable Design LLC · partstable.com
Last verified: July 2026