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Technical Data Sheet
PartsTable / COMPONENT / 4801-521857PC78
4801-521857PC78 ✓ 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 BOLT,SHOULDER is a the manufacturer industrial component. Key specifications include material: STEEL OVERALL, head_style: HEXAGON, head_height: 0.125 INCHES NOMINAL IN, thread_class: 3A A, thread_length: 0.812 INCHES MINIMUM IN, shoulder_shape: ROUND ALL SHOULDERS. This product is currently in active production with full OEM support.

This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 5306-00-467-9865, 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
4801-521857PC78
NSN: 5306-00-467-9865
FSC: 5306
CAGE: 80064 — NAVAL SHIP SYSTEMS COMMAND (USA)
SPECIFICATIONS
materialSTEEL OVERALL
head_styleHEXAGON
head_height0.125 INCHES NOMINAL IN
thread_class3A A
thread_length0.812 INCHES MINIMUM IN
shoulder_shapeROUND ALL SHOULDERS
fastener_length2.688 INCHES NOMINAL IN
shoulder_length1.375 INCHES NOMINAL FIRST SHOULDER IN
thread_directionRIGHT-HAND
shoulder_diameter0.562 INCHES NOMINAL FIRST SHOULDER IN
width_between_flats0.875 INCHES NOMINAL IN
nominal_thread_diameter0.500 INCHES IN
NSN5306-00-467-9865
COMPONENT DIAGRAM
BOLT / SCREW — THREAD VERIFICATION REQUIRED Hex HEAD LENGTH: — THREAD: — × — MATERIAL: — PN: 4801-521857PC78 · 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 SHAPE: ROUND ALL SHOULDERS
•
SHOULDER DIAMETER: 0.562 INCHES NOMINAL FIRST SHOULDER IN
•
HEAD HEIGHT: 0.125 INCHES NOMINAL IN
•
THREAD DIRECTION: RIGHT-HAND
•
SHOULDER LENGTH: 0.500 INCHES NOMINAL SECOND SHOULDER IN
•
THREAD SERIES DESIGNATOR: UNIFIED NATIONAL COARSE (UNC)
•
WIDTH BETWEEN FLATS: 0.875 INCHES NOMINAL IN
•
THREAD QUANTITY PER INCH: 13
TECHNICAL CHARACTERISTICS (FLIS)
SHOULDER SHAPEROUND ALL SHOULDERS
SHOULDER DIAMETER0.562 INCHES NOMINAL FIRST SHOULDER IN
HEAD HEIGHT0.125 INCHES NOMINAL IN
THREAD DIRECTIONRIGHT-HAND
SHOULDER LENGTH0.500 INCHES NOMINAL SECOND SHOULDER IN
THREAD SERIES DESIGNATORUNIFIED NATIONAL COARSE (UNC)
WIDTH BETWEEN FLATS0.875 INCHES NOMINAL IN
THREAD QUANTITY PER INCH13
THREAD LENGTH0.812 INCHES MINIMUM IN
MATERIALSTEEL OVERALL
VERIFIED SUBSTITUTES & CROSS-REFERENCES 26
20908Interchangeable
interchangeable cross-reference
interchangeable
8170490Interchangeable
interchangeable cross-reference
interchangeable
H191PC25Interchangeable
interchangeable cross-reference
interchangeable
H1131PC11Interchangeable
interchangeable cross-reference
interchangeable
3101-0006Interchangeable
interchangeable cross-reference
interchangeable
PS373705Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusACTIVE
AvailabilityOEM and secondary market
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is 4801-521857PC78?
4801-521857PC78 is a BOLT,SHOULDER.
What parts can replace 4801-521857PC78?
There are 26 known substitutes for 4801-521857PC78: 20908, 8170490, H191PC25 and 23 more. Substitute compatibility should be verified for your specific system.
What is the NSN for 4801-521857PC78?
4801-521857PC78 is cataloged in the Federal Logistics Information System (FLIS) under NSN 5306-00-467-9865. 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