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AN381-3-18 ✓ 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 PIN,COTTER is a the manufacturer industrial component. Key specifications include diameter: 0.094 INCHES NOMINAL IN, style_designator: STANDARD, underloop_length: 1.125 INCHES NOMINAL IN, surface_treatment: PASSIVATE OVERALL. This product is currently in active production with full OEM support.

This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 5315-00-282-1451, 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
AN381-3-18
NSN: 5315-00-282-1451
FSC: 5315
CAGE: 88044 — AERONAUTICAL STANDARDS GROUP DEPT OF NAVY AND AIR FORCE (USA)
SPECIFICATIONS
diameter0.094 INCHES NOMINAL IN
style_designatorSTANDARD
underloop_length1.125 INCHES NOMINAL IN
surface_treatmentPASSIVATE OVERALL
NSN5315-00-282-1451
COMPONENT DIAGRAM
NUT & WASHER — GRADE MATCHING REQUIRED Hex NUT CROSS-SECTION WASHER OD: — SIZE: — MATERIAL: — PN: AN381-3-18 · 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
•
DIAMETER: 0.094 INCHES NOMINAL IN
•
STYLE DESIGNATOR: STANDARD
•
UNDERLOOP LENGTH: 1.125 INCHES NOMINAL IN
•
SURFACE TREATMENT: PASSIVATE OVERALL
TECHNICAL CHARACTERISTICS (FLIS)
DIAMETER0.094 INCHES NOMINAL IN
STYLE DESIGNATORSTANDARD
UNDERLOOP LENGTH1.125 INCHES NOMINAL IN
SURFACE TREATMENTPASSIVATE OVERALL
VERIFIED SUBSTITUTES & CROSS-REFERENCES 6
AN381-3-20Interchangeable
interchangeable cross-reference
interchangeable
293-1014P19Interchangeable
interchangeable cross-reference
interchangeable
MS24665-304Interchangeable
interchangeable cross-reference
interchangeable
MS24665-303Interchangeable
interchangeable cross-reference
interchangeable
FFP386Interchangeable
interchangeable cross-reference
interchangeable
AS123795Interchangeable
Same NIIN cross-reference
interchangeable
LIFECYCLE
StatusACTIVE
AvailabilityOEM and secondary market
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is AN381-3-18?
AN381-3-18 is a PIN,COTTER.
What parts can replace AN381-3-18?
There are 6 known substitutes for AN381-3-18: AN381-3-20, 293-1014P19, MS24665-304 and 3 more. Substitute compatibility should be verified for your specific system.
What is the NSN for AN381-3-18?
AN381-3-18 is cataloged in the Federal Logistics Information System (FLIS) under NSN 5315-00-282-1451. 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