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PartsTable / COMPONENT / N400P18
N400P18 ✓ 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 COMP 301 OR STEEL COMP 302 OR STEEL COMP 316 OVERALL, thickness: 0.108 INCHES MINIMUM AND 0.160 INCHES MAXIMUM IN, hole_diameter: 0.805 INCHES MINIMUM AND 0.842 INCHES MAXIMUM IN, overall_diameter: 1.462 INCHES MINIMUM AND 1.499 INCHES MAXIMUM IN, surface_treatment: PASSIVATE OVERALL, peripheral_shape_style: ROUND. This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 5310-00-584-7799, 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
N400P18
NSN: 5310-00-584-7799
FSC: 5310
CAGE: D9182 — ZF INDUSTRIEANTRIEBE WITTEN GMBH (DEU)
SPECIFICATIONS
materialSTEEL COMP 301 OR STEEL COMP 302 OR STEEL COMP 316 OVERALL
thickness0.108 INCHES MINIMUM AND 0.160 INCHES MAXIMUM IN
hole_diameter0.805 INCHES MINIMUM AND 0.842 INCHES MAXIMUM IN
overall_diameter1.462 INCHES MINIMUM AND 1.499 INCHES MAXIMUM IN
surface_treatmentPASSIVATE OVERALL
peripheral_shape_styleROUND
center_hole_shape_styleROUND
end_item_identificationMRAP BUFFALO MK2A2; MULTIPLE LAUNCH ROCKET SYSTEM (MLRS)
cross-sectional_shape_styleRECTANGULAR
nondefinitive_spec/std_dataA TYPE AND 1 GRADE AND B CLASS
material_document_and_classification66 FED STD ALL MATERIAL RESPONSES OVERALL
surface_treatment_document_and_classificationQQ-P-35 FED SPEC SINGLE TREATMENT RESPONSE OVERALL
NSN5310-00-584-7799
COMPONENT DIAGRAM
NUT & WASHER — GRADE MATCHING REQUIRED Hex NUT CROSS-SECTION WASHER OD: — SIZE: — MATERIAL: — PN: N400P18 · 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
•
SURFACE TREATMENT DOCUMENT AND CLASSIFICATION: QQ-P-35 FED SPEC SINGLE TREATMENT RESPONSE OVERALL
•
MATERIAL DOCUMENT AND CLASSIFICATION: 66 FED STD ALL MATERIAL RESPONSES OVERALL
•
OVERALL DIAMETER: 1.462 INCHES MINIMUM AND 1.499 INCHES MAXIMUM IN
•
MATERIAL: STEEL COMP 301 OR STEEL COMP 302 OR STEEL COMP 316 OVERALL
•
NONDEFINITIVE SPEC/STD DATA: A TYPE AND 1 GRADE AND B CLASS
•
CROSS-SECTIONAL SHAPE STYLE: RECTANGULAR
•
PERIPHERAL SHAPE STYLE: ROUND
TECHNICAL CHARACTERISTICS (FLIS)
SURFACE TREATMENT DOCUMENT AND CLASSIFICATIONQQ-P-35 FED SPEC SINGLE TREATMENT RESPONSE OVERALL
MATERIAL DOCUMENT AND CLASSIFICATION66 FED STD ALL MATERIAL RESPONSES OVERALL
OVERALL DIAMETER1.462 INCHES MINIMUM AND 1.499 INCHES MAXIMUM IN
MATERIALSTEEL COMP 301 OR STEEL COMP 302 OR STEEL COMP 316 OVERALL
END ITEM IDENTIFICATIONMRAP BUFFALO MK2A2; MULTIPLE LAUNCH ROCKET SYSTEM (MLRS)
NONDEFINITIVE SPEC/STD DATAA TYPE AND 1 GRADE AND B CLASS
CROSS-SECTIONAL SHAPE STYLERECTANGULAR
PERIPHERAL SHAPE STYLEROUND
HOLE DIAMETER0.805 INCHES MINIMUM AND 0.842 INCHES MAXIMUM IN
THICKNESS0.108 INCHES MINIMUM AND 0.160 INCHES MAXIMUM IN
VERIFIED SUBSTITUTES & CROSS-REFERENCES 18
MS51971-8 3/4-1 0UNC-2B CRESInterchangeable
interchangeable cross-reference
interchangeable
5310PL0682801Interchangeable
interchangeable cross-reference
interchangeable
MILS1222 3/4-10 UNC 2B CARBON SInterchangeable
interchangeable cross-reference
interchangeable
596-6391395 FIND 23Interchangeable
interchangeable cross-reference
interchangeable
FF-N-836Interchangeable
interchangeable cross-reference
interchangeable
NUT-S-032232Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusCANCELLED
Availability—
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is N400P18?
N400P18 is a WASHER,FLAT.
What parts can replace N400P18?
There are 18 known substitutes for N400P18: MS51971-8 3/4-1 0UNC-2B CRES, 5310PL0682801, MILS1222 3/4-10 UNC 2B CARBON S and 15 more. Substitute compatibility should be verified for your specific system.
Is N400P18 still available?
N400P18 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