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Technical Data Sheet
PartsTable / COMPONENT / 25255-5
25255-5 ✓ 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 HUB,FAN CLUTCH is a the manufacturer thermal management component critical for maintaining optimal operating temperatures in enterprise hardware. Key specifications include material: ALUMINUM ALLOY, overall_length: 1.310 INCHES NOMINAL IN, overall_diameter: 1.375 INCHES NOMINAL IN, special_features: MATERIAL SPEC QQ-A-200/8, T6;SURFACE SPEC MIL-A-8625, TYPE LL, CLASS 1;NEXT HIGHER ASSEMBLY IS BRAKE, DRAG ASSEMBLY, surface_treatment: ANODIZE, end_item_identification: MK 104 MOD 3;RH/MH-53 HELICOPTER. This product is currently in active production with full OEM support.

This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 5315-01-141-0884, 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
25255-5
NSN: 5315-01-141-0884
FSC: 5315
CAGE: 19220 — EASTERN CO DIV EBERHARD MANUFACTURING (USA)
SPECIFICATIONS
materialALUMINUM ALLOY
overall_length1.310 INCHES NOMINAL IN
overall_diameter1.375 INCHES NOMINAL IN
special_featuresMATERIAL SPEC QQ-A-200/8, T6;SURFACE SPEC MIL-A-8625, TYPE LL, CLASS 1;NEXT HIGHER ASSEMBLY IS BRAKE, DRAG ASSEMBLY
surface_treatmentANODIZE
end_item_identificationMK 104 MOD 3;RH/MH-53 HELICOPTER
NSN5315-01-141-0884
COMPONENT DIAGRAM
NUT & WASHER — GRADE MATCHING REQUIRED Hex NUT CROSS-SECTION WASHER OD: — SIZE: — MATERIAL: — PN: 25255-5 · 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
•
PIN CENTER TO HANDLE END DISTANCE: 2.530 INCHES NOMINAL IN
•
PIN ATTACHMENT TYPE: RETAINING CHAIN
•
ACTUATION METHOD: PUSH BUTTON
•
MATERIAL: STEEL OVERALL
•
SHANK DIAMETER: 0.620 INCHES NOMINAL IN
•
GRIP LENGTH: 2.870 INCHES NOMINAL IN
•
DETENT QUANTITY: 2
•
STYLE DESIGNATOR: L HANDLE
TYPICAL APPLICATIONS
  • Server thermal management and cooling
  • Hot-swap fan replacement in production environments
  • Redundant cooling for high-availability systems
TECHNICAL CHARACTERISTICS (FLIS)
PIN CENTER TO HANDLE END DISTANCE2.530 INCHES NOMINAL IN
PIN ATTACHMENT TYPERETAINING CHAIN
ACTUATION METHODPUSH BUTTON
MATERIALSTEEL OVERALL
SHANK DIAMETER0.620 INCHES NOMINAL IN
GRIP LENGTH2.870 INCHES NOMINAL IN
DETENT QUANTITY2
STYLE DESIGNATORL HANDLE
ACTUATION TYPEPUSH
SHOULDER TO HEAD END DISTANCE1.180 INCHES NOMINAL IN
VERIFIED SUBSTITUTES & CROSS-REFERENCES 4
25255Interchangeable
interchangeable cross-reference
interchangeable
25255-5Interchangeable
interchangeable cross-reference
interchangeable
B4032810-004Interchangeable
Same NIIN cross-reference
interchangeable
12308021Interchangeable
Same NIIN cross-reference
interchangeable
LIFECYCLE
StatusACTIVE
AvailabilityOEM and secondary market
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is 25255-5?
25255-5 is a HUB,FAN CLUTCH.
What parts can replace 25255-5?
There are 4 known substitutes for 25255-5: 25255, 25255-5, B4032810-004 and 1 more. Substitute compatibility should be verified for your specific system.
What is the NSN for 25255-5?
25255-5 is cataloged in the Federal Logistics Information System (FLIS) under NSN 5315-01-141-0884. 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