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3903-021 — PIN,LOCK

✓ Government record, cited
— · NUT WASHER
PRODUCT OVERVIEW

3903-021: PIN,LOCK.

The PIN,LOCK is a the manufacturer industrial component. Key specifications include material: STEEL OVERALL, prong_length: 0.250 INCHES NOMINAL IN, opening_width: 0.120 INCHES NOMINAL IN, style_designator: LOCK, surface_treatment: PASSIVATE OVERALL, wire_stock_diameter: 0.0285 INCHES NOMINAL IN. This part is cataloged in the U.S.

Government catalog under NSN 5315-01-004-4564, 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
3903-021
NSN: 5315-01-004-4564
FSC: 5315 — Nails, Machine Keys, and Pins
CAGE: 66503 — WOODWARD, INC. DIV FUEL SYSTEMS AND CONTROLS (USA)
SPECIFICATIONS
materialSTEEL OVERALL
prong_length0.250 INCHES NOMINAL IN
opening_width0.120 INCHES NOMINAL IN
style_designatorLOCK
surface_treatmentPASSIVATE OVERALL
wire_stock_diameter0.0285 INCHES NOMINAL IN
material_document_and_classificationAMS 5673 ASSN STD SINGLE MATERIAL RESPONSE OVERALL
surface_treatment_document_and_classificationSP-229,66503 MFR REF SINGLE TREATMENT RESPONSE OVERALL
NSN5315-01-004-4564
COMPONENT DIAGRAM
NUT & WASHER — GRADE MATCHING REQUIRED Hex NUT CROSS-SECTION WASHER OD: — SIZE: — MATERIAL: — PN: 3903-021 · 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: 0.0285 INCHES NOMINAL IN
•
SURFACE TREATMENT DOCUMENT AND CLASSIFICATION: SP-229,66503 MFR REF SINGLE TREATMENT RESPONSE OVERALL
•
STYLE DESIGNATOR: LOCK
•
OPENING WIDTH: 0.120 INCHES NOMINAL IN
•
MATERIAL DOCUMENT AND CLASSIFICATION: AMS 5673 ASSN STD SINGLE MATERIAL RESPONSE OVERALL
•
PRONG LENGTH: 0.250 INCHES NOMINAL IN
•
SURFACE TREATMENT: PASSIVATE OVERALL
•
MATERIAL: STEEL OVERALL
TECHNICAL CHARACTERISTICS
WIRE STOCK DIAMETER0.0285 INCHES NOMINAL IN
SURFACE TREATMENT DOCUMENT AND CLASSIFICATIONSP-229,66503 MFR REF SINGLE TREATMENT RESPONSE OVERALL
STYLE DESIGNATORLOCK
OPENING WIDTH0.120 INCHES NOMINAL IN
MATERIAL DOCUMENT AND CLASSIFICATIONAMS 5673 ASSN STD SINGLE MATERIAL RESPONSE OVERALL
PRONG LENGTH0.250 INCHES NOMINAL IN
SURFACE TREATMENTPASSIVATE OVERALL
MATERIALSTEEL 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: Insurance item — stocked against contingency demandNo demilitarization required
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FREQUENTLY ASKED QUESTIONS
What is 3903-021?
3903-021 is a PIN,LOCK.
What is the NSN for 3903-021?
3903-021 is cataloged in the U.S. Government catalog under NSN 5315-01-004-4564. 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.