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PartsTable / COMPONENT / 25555R1
25555R1 ✓ 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,FLAT is a the manufacturer industrial component. Key specifications include material: STEEL OVERALL, thickness: 0.188 INCHES NOMINAL IN, hole_diameter: 0.531 INCHES NOMINAL IN, overall_diameter: 1.250 INCHES NOMINAL IN, surface_treatment: ZINC OVERALL, peripheral_shape_style: ROUND. This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 5310-01-556-5377, 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
25555R1
NSN: 5310-01-556-5377
FSC: 5310
CAGE: 338X5 — ND DEFENSE LLC (USA)
SPECIFICATIONS
materialSTEEL OVERALL
thickness0.188 INCHES NOMINAL IN
hole_diameter0.531 INCHES NOMINAL IN
overall_diameter1.250 INCHES NOMINAL IN
surface_treatmentZINC OVERALL
peripheral_shape_styleROUND
center_hole_shape_styleROUND
end_item_identificationMINE RESISTANT AMBUSH PROTECTED VEHICLE - MRAP; MRAP MAXXPRO DASH ISS W/OGPK AND W/CROWS
cross-sectional_shape_styleRECTANGULAR
part_name_assigned_by_controlling_agencyWASHER,.531 X 1.250 X .188 HD
NSN5310-01-556-5377
COMPONENT DIAGRAM
NUT & WASHER — GRADE MATCHING REQUIRED Hex NUT CROSS-SECTION WASHER OD: — SIZE: — MATERIAL: — PN: 25555R1 · 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
VERIFIED SUBSTITUTES & CROSS-REFERENCES 20
40255Interchangeable
interchangeable cross-reference
interchangeable
AC4307-67Interchangeable
interchangeable cross-reference
interchangeable
657913Interchangeable
interchangeable cross-reference
interchangeable
351A7Interchangeable
interchangeable cross-reference
interchangeable
73019Interchangeable
interchangeable cross-reference
interchangeable
2387006Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusCANCELLED
Availability—
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is 25555R1?
25555R1 is a WASHER,FLAT.
What parts can replace 25555R1?
There are 20 known substitutes for 25555R1: 40255, AC4307-67, 657913 and 17 more. Substitute compatibility should be verified for your specific system.
Is 25555R1 still available?
25555R1 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: July 2026