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3903-018 — PIN,LOCK

✓ Government record, cited
— · NUT WASHER
PRODUCT OVERVIEW

3903-018: PIN,LOCK.

The PIN,LOCK is a the manufacturer industrial component. Key specifications include material: STEEL COMP 631 OVERALL, prong_length: 0.312 INCHES NOMINAL IN, special_features: PRONG END FACES CLOSED END OF BODY, surface_treatment: PASSIVATE OVERALL, wire_stock_diameter: 0.040 INCHES NOMINAL IN, material_document_and_classification: AMS 5673 ASSN STD SINGLE MATERIAL RESPONSE OVERALL. This part is cataloged in the U.S.

Government catalog under NSN 5315-00-781-0895, 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
3903-018
NSN: 5315-00-781-0895
FSC: 5315 — Nails, Machine Keys, and Pins
CAGE: 66503 — WOODWARD, INC. DIV FUEL SYSTEMS AND CONTROLS (USA)
SPECIFICATIONS
materialSTEEL COMP 631 OVERALL
prong_length0.312 INCHES NOMINAL IN
special_featuresPRONG END FACES CLOSED END OF BODY
surface_treatmentPASSIVATE OVERALL
wire_stock_diameter0.040 INCHES NOMINAL IN
material_document_and_classificationAMS 5673 ASSN STD SINGLE MATERIAL RESPONSE OVERALL
NSN5315-00-781-0895
COMPONENT DIAGRAM
NUT & WASHER — GRADE MATCHING REQUIRED Hex NUT CROSS-SECTION WASHER OD: — SIZE: — MATERIAL: — PN: 3903-018 · 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
•
WIRE STOCK DIAMETER: 0.040 INCHES NOMINAL IN
•
MATERIAL DOCUMENT AND CLASSIFICATION: AMS 5673 ASSN STD SINGLE MATERIAL RESPONSE OVERALL
•
PRONG LENGTH: 0.312 INCHES NOMINAL IN
•
SURFACE TREATMENT: PASSIVATE OVERALL
•
MATERIAL: STEEL COMP 631 OVERALL
TECHNICAL CHARACTERISTICS
WIRE STOCK DIAMETER0.040 INCHES NOMINAL IN
MATERIAL DOCUMENT AND CLASSIFICATIONAMS 5673 ASSN STD SINGLE MATERIAL RESPONSE OVERALL
PRONG LENGTH0.312 INCHES NOMINAL IN
SPECIAL FEATURESPRONG END FACES CLOSED END OF BODY
SURFACE TREATMENTPASSIVATE OVERALL
MATERIALSTEEL COMP 631 OVERALL
OTHER ITEMS IN FSC 5315 — Nails, Machine Keys, and Pins
Items in the same Federal Supply class. No interchangeability or substitution relationship is implied.
5315-00-000-1037 5315-00-000-1067 5315-00-000-1245 5315-00-000-1372 5315-00-000-1412 5315-00-001-1571 5315-00-001-1572 5315-00-001-1602
SUBSTITUTES & CROSS-REFERENCES

No substitute or cross-reference records for this part.

LIFECYCLE
NSN statusActive· U.S. Government catalog
Acquisition advice: Semi-active item — no replacement plannedNo demilitarization required
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FREQUENTLY ASKED QUESTIONS
What is 3903-018?
3903-018 is a PIN,LOCK.
What is the NSN for 3903-018?
3903-018 is cataloged in the U.S. Government catalog under NSN 5315-00-781-0895. This indicates validated use in U.S. government and defense supply chains.
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✓ PartsTable — the parts reference. Every fact cited to its source.
PartsTable Design LLC · partstable.com
U.S. Government catalog: edition PUBLOGDVD v12.0.0 (OCT 2026), edition date 2026-10-01, retrieved 2026-10-18.
PartsTable commercial catalog: edition Unified commercial catalog snapshot through 2026-09-28, edition date not on file, retrieved 2026-09-28.