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PartsTable / COMPONENT / 810-2178000-6 ITEM 4
810-2178000-6 ITEM 4 ✓ 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: NICKEL ALLOY K-500 OVERALL, head_style: ROUND W/WRENCH FLATS, head_height: 0.375 INCHES NOMINAL IN, thread_class: 2A A, head_diameter: 2.750 INCHES NOMINAL IN, thread_length: 0.437 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 5306-01-115-2502, 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
810-2178000-6 ITEM 4
NSN: 5306-01-115-2502
FSC: 5306
CAGE: 53711 — NAVAL SEA SYSTEMS COMMAND (USA)
SPECIFICATIONS
materialNICKEL ALLOY K-500 OVERALL
head_styleROUND W/WRENCH FLATS
head_height0.375 INCHES NOMINAL IN
thread_class2A A
head_diameter2.750 INCHES NOMINAL IN
thread_length0.437 INCHES NOMINAL IN
shoulder_shapeROUND FIRST SHOULDER
fastener_length5.750 INCHES NOMINAL IN
shoulder_length5.188 INCHES NOMINAL FIRST SHOULDER IN
thread_directionRIGHT-HAND
shoulder_diameter1.749 INCHES MINIMUM AND 1.750 INCHES MAXIMUM FIRST SHOULDER IN
width_between_flats2.250 INCHES NOMINAL IN
NSN5306-01-115-2502
COMPONENT DIAGRAM
BOLT / SCREW — THREAD VERIFICATION REQUIRED Hex HEAD LENGTH: — THREAD: — × — MATERIAL: — PN: 810-2178000-6 ITEM 4 · 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 SERIES DESIGNATOR: UN
•
HEAD DIAMETER: 2.750 INCHES NOMINAL IN
•
THREAD QUANTITY PER INCH: 12
•
MATERIAL: NICKEL ALLOY K-500 OVERALL
•
SHOULDER DIAMETER: 1.749 INCHES MINIMUM AND 1.750 INCHES MAXIMUM FIRST SHOULDER IN
•
MATERIAL DOCUMENT AND CLASSIFICATION: QQ-N-286 FED SPEC SINGLE MATERIAL RESPONSE OVERALL
•
THREAD DIRECTION: RIGHT-HAND
•
SHOULDER LENGTH: 5.188 INCHES NOMINAL FIRST SHOULDER IN
TECHNICAL CHARACTERISTICS (FLIS)
THREAD SERIES DESIGNATORUN
HEAD DIAMETER2.750 INCHES NOMINAL IN
THREAD QUANTITY PER INCH12
MATERIALNICKEL ALLOY K-500 OVERALL
SHOULDER DIAMETER1.749 INCHES MINIMUM AND 1.750 INCHES MAXIMUM FIRST SHOULDER IN
MATERIAL DOCUMENT AND CLASSIFICATIONQQ-N-286 FED SPEC SINGLE MATERIAL RESPONSE OVERALL
THREAD DIRECTIONRIGHT-HAND
SHOULDER LENGTH5.188 INCHES NOMINAL FIRST SHOULDER IN
WIDTH BETWEEN FLATS2.250 INCHES NOMINAL IN
THREAD LENGTH0.437 INCHES NOMINAL IN
VERIFIED SUBSTITUTES & CROSS-REFERENCES 14
501681Interchangeable
interchangeable cross-reference
interchangeable
0664375Interchangeable
interchangeable cross-reference
interchangeable
01681Interchangeable
interchangeable cross-reference
interchangeable
20-150-3013-2Interchangeable
interchangeable cross-reference
interchangeable
14153Interchangeable
interchangeable cross-reference
interchangeable
R14153Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusACTIVE
AvailabilityOEM and secondary market
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is 810-2178000-6 ITEM 4?
810-2178000-6 ITEM 4 is a BOLT,SHOULDER.
What parts can replace 810-2178000-6 ITEM 4?
There are 14 known substitutes for 810-2178000-6 ITEM 4: 501681, 0664375, 01681 and 11 more. Substitute compatibility should be verified for your specific system.
What is the NSN for 810-2178000-6 ITEM 4?
810-2178000-6 ITEM 4 is cataloged in the Federal Logistics Information System (FLIS) under NSN 5306-01-115-2502. 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