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Technical Data Sheet
PartsTable / COMPONENT / 4M25-3L
4M25-3L ✓ 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: 0.032 INCHES NOMINAL IN, hole_diameter: 0.203 INCHES NOMINAL IN, overall_diameter: 0.438 INCHES NOMINAL IN, special_features: GREEN COLOR, peripheral_shape_style: ROUND. This product is currently in active production with full OEM support.

This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 5310-00-680-5457, 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
4M25-3L
NSN: 5310-00-680-5457
FSC: 5310
CAGE: 76301 — THE BOEING COMPANY DIV DEFENSE (USA)
SPECIFICATIONS
materialSTEEL OVERALL
thickness0.032 INCHES NOMINAL IN
hole_diameter0.203 INCHES NOMINAL IN
overall_diameter0.438 INCHES NOMINAL IN
special_featuresGREEN COLOR
peripheral_shape_styleROUND
center_hole_shape_styleROUND
cross-sectional_shape_styleRECTANGULAR
material_document_and_classification-1L-S-6721,TYPE 321 MIL SPEC SINGLE MATERIAL RESPONSE OVERALL
NSN5310-00-680-5457
COMPONENT DIAGRAM
NUT & WASHER — GRADE MATCHING REQUIRED Hex NUT CROSS-SECTION WASHER OD: — SIZE: — MATERIAL: — PN: 4M25-3L · 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
•
CROSS-SECTIONAL SHAPE STYLE: RECTANGULAR
•
PERIPHERAL SHAPE STYLE: ROUND
•
MATERIAL: STEEL OVERALL
•
MATERIAL DOCUMENT AND CLASSIFICATION: -1L-S-6721,TYPE 321 MIL SPEC SINGLE MATERIAL RESPONSE OVERALL
•
CENTER HOLE SHAPE STYLE: ROUND
•
OVERALL DIAMETER: 0.438 INCHES NOMINAL IN
•
HOLE DIAMETER: 0.203 INCHES NOMINAL IN
TECHNICAL CHARACTERISTICS (FLIS)
CROSS-SECTIONAL SHAPE STYLERECTANGULAR
SPECIAL FEATURESGREEN COLOR
PERIPHERAL SHAPE STYLEROUND
MATERIALSTEEL OVERALL
MATERIAL DOCUMENT AND CLASSIFICATION-1L-S-6721,TYPE 321 MIL SPEC SINGLE MATERIAL RESPONSE OVERALL
CENTER HOLE SHAPE STYLEROUND
OVERALL DIAMETER0.438 INCHES NOMINAL IN
HOLE DIAMETER0.203 INCHES NOMINAL IN
THICKNESS0.032 INCHES NOMINAL IN
VERIFIED SUBSTITUTES & CROSS-REFERENCES 4
820-5787500ITEM50Interchangeable
interchangeable cross-reference
interchangeable
5310PL0677566Interchangeable
interchangeable cross-reference
interchangeable
5310PL1368710Interchangeable
interchangeable cross-reference
interchangeable
LD153-0010-0007Interchangeable
Same NIIN cross-reference
interchangeable
LIFECYCLE
StatusACTIVE
AvailabilityOEM and secondary market
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is 4M25-3L?
4M25-3L is a WASHER,FLAT.
What parts can replace 4M25-3L?
There are 4 known substitutes for 4M25-3L: 820-5787500ITEM50, 5310PL0677566, 5310PL1368710 and 1 more. Substitute compatibility should be verified for your specific system.
What is the NSN for 4M25-3L?
4M25-3L is cataloged in the Federal Logistics Information System (FLIS) under NSN 5310-00-680-5457. 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