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Technical Data Sheet
PartsTable / COMPONENT / A-7551-18CC
A-7551-18CC ✓ Verified by PartsTable
— · NUT WASHER
WHAT YOU NEED TO KNOW
Match nut grade to bolt grade for full strength Lock nuts prevent loosening under vibration
Don't mix grades — weakens the joint
PRODUCT OVERVIEW

The NUT,PLAIN,HEXAGON is a the manufacturer industrial component. Key specifications include material: STEEL OVERALL, nut_style: HEXAGON, nut_height: 0.220 INCHES NOMINAL IN, thread_class: 2B, thread_series: UNIFIED NATIONAL COARSE (UNC), thread_direction: RIGHT-HAND. This product is currently in active production with full OEM support.

This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 5310-01-533-7574, 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
A-7551-18CC
NSN: 5310-01-533-7574
FSC: 5310
CAGE: 38151 — MARATHON ELECTRIC, LLC (USA)
SPECIFICATIONS
materialSTEEL OVERALL
nut_styleHEXAGON
nut_height0.220 INCHES NOMINAL IN
thread_class2B
thread_seriesUNIFIED NATIONAL COARSE (UNC)
thread_directionRIGHT-HAND
width_across_flats0.440 INCHES NOMINAL IN
nominal_thread_size0.250 INCHES IN
end_item_identification6115-01-296-1463; GENERATOR SET, DIESEL ENGINE
thread_quantity_per_inch20
part_name_assigned_by_controlling_agencyHEX NUT-ASA STANDARD
NSN5310-01-533-7574
COMPONENT DIAGRAM
NUT & WASHER — GRADE MATCHING REQUIRED Hex NUT CROSS-SECTION WASHER OD: — SIZE: — MATERIAL: — PN: A-7551-18CC · OEM ⚠ VERIFY BEFORE ORDERING Grade matters for torque spec — don't mix grades. A Grade 5 nut on a Grade 8 bolt weakens the joint. Lock nuts, wing nuts, and castle nuts are NOT interchangeable with standard hex ✓ BROKER TIP Match nut to bolt thread class and material. Stainless bolt + zinc nut = galvanic corrosion. Always verify finish matches (plain, zinc, hot-dip galvanized) PARTSTABLE TECHNICAL DRAWING — NOT TO SCALE
KEY FEATURES
•
THREAD DIRECTION: RIGHT-HAND
•
WIDTH ACROSS FLATS: 0.440 INCHES NOMINAL IN
•
NUT HEIGHT: 0.220 INCHES NOMINAL IN
•
NOMINAL THREAD SIZE: 0.250 INCHES IN
•
MATERIAL: STEEL OVERALL
•
THREAD CLASS: 2B
TECHNICAL CHARACTERISTICS (FLIS)
THREAD DIRECTIONRIGHT-HAND
WIDTH ACROSS FLATS0.440 INCHES NOMINAL IN
NUT HEIGHT0.220 INCHES NOMINAL IN
NOMINAL THREAD SIZE0.250 INCHES IN
MATERIALSTEEL OVERALL
THREAD CLASS2B
PART NAME ASSIGNED BY CONTROLLING AGENCYHEX NUT-ASA STANDARD
END ITEM IDENTIFICATION6115-01-296-1463; GENERATOR SET, DIESEL ENGINE
NUT STYLEHEXAGON
THREAD QUANTITY PER INCH20
VERIFIED SUBSTITUTES & CROSS-REFERENCES 3
A7551Interchangeable
interchangeable cross-reference
interchangeable
T42Interchangeable
interchangeable cross-reference
interchangeable
4920H21-000Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusACTIVE
AvailabilityOEM and secondary market
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is A-7551-18CC?
A-7551-18CC is a NUT,PLAIN,HEXAGON.
What parts can replace A-7551-18CC?
There are 3 known substitutes for A-7551-18CC: A7551, T42, 4920H21-000. Substitute compatibility should be verified for your specific system.
What is the NSN for A-7551-18CC?
A-7551-18CC is cataloged in the Federal Logistics Information System (FLIS) under NSN 5310-01-533-7574. 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