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1855613 ✓ 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: RUBBER SYNTHETIC OVERALL, thickness: 0.015 INCHES MINIMUM AND 0.025 INCHES MAXIMUM IN, hole_diameter: 0.552 INCHES MINIMUM AND 0.582 INCHES MAXIMUM IN, hardness_rating: 60.0 DUROMETER NOMINAL, overall_diameter: 0.875 INCHES NOMINAL IN, peripheral_shape_style: ROUND. This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 5310-00-618-6270, 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
1855613
NSN: 5310-00-618-6270
FSC: 5310
CAGE: 10001 — NAVAIR AND NAVSEA MANAGED ORIGINAL DESIGN ACTIVITY DWG NOT MATERIAL/PARTS SUPPLIER (USA)
SPECIFICATIONS
materialRUBBER SYNTHETIC OVERALL
thickness0.015 INCHES MINIMUM AND 0.025 INCHES MAXIMUM IN
hole_diameter0.552 INCHES MINIMUM AND 0.582 INCHES MAXIMUM IN
hardness_rating60.0 DUROMETER NOMINAL
overall_diameter0.875 INCHES NOMINAL IN
peripheral_shape_styleROUND
center_hole_shape_styleROUND
cross-sectional_shape_styleRECTANGULAR
material_document_and_classificationMIL-S-6855,CL 2,GR 60 MIL SPEC SINGLE MATERIAL RESPONSE OVERALL
NSN5310-00-618-6270
COMPONENT DIAGRAM
NUT & WASHER — GRADE MATCHING REQUIRED Hex NUT CROSS-SECTION WASHER OD: — SIZE: — MATERIAL: — PN: 1855613 · 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
•
HOLE DIAMETER: 0.552 INCHES MINIMUM AND 0.582 INCHES MAXIMUM IN
•
PERIPHERAL SHAPE STYLE: ROUND
•
MATERIAL DOCUMENT AND CLASSIFICATION: MIL-S-6855,CL 2,GR 60 MIL SPEC SINGLE MATERIAL RESPONSE OVERALL
•
MATERIAL: RUBBER SYNTHETIC OVERALL
•
CROSS-SECTIONAL SHAPE STYLE: RECTANGULAR
•
HARDNESS RATING: 60.0 DUROMETER NOMINAL
•
OVERALL DIAMETER: 0.875 INCHES NOMINAL IN
•
CENTER HOLE SHAPE STYLE: ROUND
TECHNICAL CHARACTERISTICS (FLIS)
HOLE DIAMETER0.552 INCHES MINIMUM AND 0.582 INCHES MAXIMUM IN
PERIPHERAL SHAPE STYLEROUND
MATERIAL DOCUMENT AND CLASSIFICATIONMIL-S-6855,CL 2,GR 60 MIL SPEC SINGLE MATERIAL RESPONSE OVERALL
MATERIALRUBBER SYNTHETIC OVERALL
CROSS-SECTIONAL SHAPE STYLERECTANGULAR
HARDNESS RATING60.0 DUROMETER NOMINAL
OVERALL DIAMETER0.875 INCHES NOMINAL IN
CENTER HOLE SHAPE STYLEROUND
THICKNESS0.015 INCHES MINIMUM AND 0.025 INCHES MAXIMUM IN
VERIFIED SUBSTITUTES & CROSS-REFERENCES 4
MIL-R-10509/7Interchangeable
interchangeable cross-reference
interchangeable
C4-8251FInterchangeable
interchangeable cross-reference
interchangeable
RN55D8201FInterchangeable
interchangeable cross-reference
interchangeable
341388Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusCANCELLED
Availability—
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is 1855613?
1855613 is a WASHER,FLAT.
What parts can replace 1855613?
There are 4 known substitutes for 1855613: MIL-R-10509/7, C4-8251F, RN55D8201F and 1 more. Substitute compatibility should be verified for your specific system.
Is 1855613 still available?
1855613 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