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Technical Data Sheet
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RT88 ✓ 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 WASHER,LOCK is a the manufacturer industrial component. Key specifications include end_item_identification: 6230-01-530-8890, part_name_assigned_by_controlling_agency: WASHER,M4 EXT STAR. This product is currently in active production with full OEM support.

This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 5310-01-538-1787, 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
RT88
NSN: 5310-01-538-1787
FSC: 5310
CAGE: 1SE17 — ENDRIES INTERNATIONAL, INC. DBA SERVTONICS, AN ENDRIES INTERNATIONAL, INC. (USA)
SPECIFICATIONS
end_item_identification6230-01-530-8890
part_name_assigned_by_controlling_agencyWASHER,M4 EXT STAR
NSN5310-01-538-1787
COMPONENT DIAGRAM
NUT & WASHER — GRADE MATCHING REQUIRED Hex NUT CROSS-SECTION WASHER OD: — SIZE: — MATERIAL: — PN: RT88 · 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
TECHNICAL CHARACTERISTICS (FLIS)
PART NAME ASSIGNED BY CONTROLLING AGENCYWASHER,M4 EXT STAR
END ITEM IDENTIFICATION6230-01-530-8890
VERIFIED SUBSTITUTES & CROSS-REFERENCES 11
60-7-22Interchangeable
interchangeable cross-reference
interchangeable
FFB571ANDCLASSCInterchangeable
interchangeable cross-reference
interchangeable
00-S-550Interchangeable
interchangeable cross-reference
interchangeable
428696Interchangeable
interchangeable cross-reference
interchangeable
B1010 15991Interchangeable
interchangeable cross-reference
interchangeable
5305PL0718218Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusACTIVE
AvailabilityOEM and secondary market
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is RT88?
RT88 is a WASHER,LOCK.
What parts can replace RT88?
There are 11 known substitutes for RT88: 60-7-22, FFB571ANDCLASSC, 00-S-550 and 8 more. Substitute compatibility should be verified for your specific system.
What is the NSN for RT88?
RT88 is cataloged in the Federal Logistics Information System (FLIS) under NSN 5310-01-538-1787. 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