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PartsTable / COMPONENT / AN381-4-18
AN381-4-18 ✓ 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: 0.118 INCHES NOMINAL IN, material: STEEL CORROSION RESISTING OVERALL, style_designator: STANDARD, underloop_length: 1.125 INCHES NOMINAL IN, surface_treatment: PASSIVATE OVERALL. This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 5315-00-844-4035, 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
AN381-4-18
NSN: 5315-00-844-4035
FSC: 5315
CAGE: 88044 — AERONAUTICAL STANDARDS GROUP DEPT OF NAVY AND AIR FORCE (USA)
SPECIFICATIONS
diameter0.118 INCHES NOMINAL IN
materialSTEEL CORROSION RESISTING OVERALL
style_designatorSTANDARD
underloop_length1.125 INCHES NOMINAL IN
surface_treatmentPASSIVATE OVERALL
NSN5315-00-844-4035
COMPONENT DIAGRAM
NUT & WASHER — GRADE MATCHING REQUIRED Hex NUT CROSS-SECTION WASHER OD: — SIZE: — MATERIAL: — PN: AN381-4-18 · 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
•
UNDERLOOP LENGTH: 1.125 INCHES NOMINAL IN
•
DIAMETER: 0.118 INCHES NOMINAL IN
•
STYLE DESIGNATOR: STANDARD
•
SURFACE TREATMENT: PASSIVATE OVERALL
•
MATERIAL: STEEL CORROSION RESISTING OVERALL
TECHNICAL CHARACTERISTICS (FLIS)
UNDERLOOP LENGTH1.125 INCHES NOMINAL IN
DIAMETER0.118 INCHES NOMINAL IN
STYLE DESIGNATORSTANDARD
SURFACE TREATMENTPASSIVATE OVERALL
MATERIALSTEEL CORROSION RESISTING OVERALL
VERIFIED SUBSTITUTES & CROSS-REFERENCES 8
59D12Interchangeable
interchangeable cross-reference
interchangeable
12Z5056-16Interchangeable
interchangeable cross-reference
interchangeable
MR36-10Interchangeable
interchangeable cross-reference
interchangeable
812 0529Interchangeable
interchangeable cross-reference
interchangeable
1556398Interchangeable
interchangeable cross-reference
interchangeable
1450808Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusCANCELLED
Availability—
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is AN381-4-18?
AN381-4-18 is a PIN,COTTER.
What parts can replace AN381-4-18?
There are 8 known substitutes for AN381-4-18: 59D12, 12Z5056-16, MR36-10 and 5 more. Substitute compatibility should be verified for your specific system.
Is AN381-4-18 still available?
AN381-4-18 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