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Technical Data Sheet
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2521-01 — Technical Data Sheet

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— · 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 LINING,FRICTION is a the manufacturer industrial component. Key specifications include end_item_identification: REEL ASSEMBLY, STATIC DISCHARGE RMU-40A A, part_name_assigned_by_controlling_agency: (INAVY)REEL AY, STATIC DISC. This part is cataloged in the Federal Logistics Information System under NSN 5310-00-269-6340, 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
2521-01
NSN: 5310-00-269-6340
FSC: 5310
CAGE: 11083 — CATERPILLAR INC DIV CATERPILLAR DEFENSE (USA)
SPECIFICATIONS
end_item_identificationREEL ASSEMBLY, STATIC DISCHARGE RMU-40A A
part_name_assigned_by_controlling_agency(INAVY)REEL AY, STATIC DISC
NSN5310-00-269-6340
COMPONENT DIAGRAM
NUT & WASHER — GRADE MATCHING REQUIRED Hex NUT CROSS-SECTION WASHER OD: — SIZE: — MATERIAL: — PN: 2521-01 · 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
•
LOCKING FEATURE: PREVAILING TORQUE ALL METAL DESIGN
•
THREAD SERIES: UNIFIED NATIONAL COARSE (UNC)
•
BEARING SURFACE TYPE: CHAMFERED
•
THREAD QUANTITY PER INCH: 10
•
NOMINAL THREAD SIZE: 0.750 INCHES IN
•
MATERIAL: STEEL OVERALL
•
THREAD CLASS: 2B
TECHNICAL CHARACTERISTICS
LOCKING FEATUREPREVAILING TORQUE ALL METAL DESIGN
THREAD SERIESUNIFIED NATIONAL COARSE (UNC)
BEARING SURFACE TYPECHAMFERED
THREAD QUANTITY PER INCH10
NOMINAL THREAD SIZE0.750 INCHES IN
MATERIALSTEEL OVERALL
THREAD CLASS2B
END ITEM IDENTIFICATIONNSN 2320-01-097-0260 HEMTT (HEAVY EXPANDED MOBILITY TACTICAL TRUCK); NSN 2320-01-304-2277 PLS (PALLETIZED LOADING SYSTEM)
WIDTH ACROSS FLATS1.125 INCHES NOMINAL IN
THREAD DIRECTIONRIGHT-HAND
VERIFIED SUBSTITUTES & CROSS-REFERENCES 4
25210InterchangeableGOVERNMENT REGISTRY
interchangeable cross-reference
interchangeable
4HS872InterchangeableGOVERNMENT REGISTRY
Same NIIN cross-reference
interchangeable
RAILR0ADASR3-4-10InterchangeableGOVERNMENT REGISTRY
Same NIIN cross-reference
interchangeable
ER0009InterchangeableGOVERNMENT REGISTRY
Same NIIN cross-reference
interchangeable
LIFECYCLE
StatusCANCELLEDGOVERNMENT REGISTRY
Availability—
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is 2521-01?
2521-01 is a LINING,FRICTION.
What parts can replace 2521-01?
There are 4 known substitutes for 2521-01: 25210, 4HS872, RAILR0ADASR3-4-10 and 1 more. Substitute compatibility should be verified for your specific system.
Is 2521-01 still available?
2521-01 is currently cancelled.
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✓ Validated with multiple authoritative sources, including Government, OEM, and Certified sources.
PartsTable Design LLC · partstable.com
Last verified: September 2026