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12539C18B — WASHER,LOCK

✓ Government record, cited
— · NUT WASHER
PRODUCT OVERVIEW

12539C18B: WASHER,LOCK.

The WASHER,LOCK is a the manufacturer industrial component. Key specifications include material: STEEL COMP 303 OR STEEL COMP 304 OR STEEL COMP 305 OVERALL, hole_diameter: 0.253 INCHES NOMINAL IN, outside_diameter: 0.413 INCHES NOMINAL IN, style_designator: SPLIT HELICAL-RIGHT HAND, material_thickness: 0.040 INCHES MINIMUM AND 0.080 INCHES MAXIMUM IN. This part is cataloged in the U.S.

Government catalog under NSN 5310-01-362-0361, 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
12539C18B
NSN: 5310-01-362-0361
FSC: 5310 — Nuts and Washers
CAGE: 0UBG9 — CURTISS-WRIGHT ELECTRO-MECHANICAL CORPORATION DIV EPD (USA)
SPECIFICATIONS
materialSTEEL COMP 303 OR STEEL COMP 304 OR STEEL COMP 305 OVERALL
hole_diameter0.253 INCHES NOMINAL IN
outside_diameter0.413 INCHES NOMINAL IN
style_designatorSPLIT HELICAL-RIGHT HAND
material_thickness0.040 INCHES MINIMUM AND 0.080 INCHES MAXIMUM IN
NSN5310-01-362-0361
COMPONENT DIAGRAM
NUT & WASHER — GRADE MATCHING REQUIRED Hex NUT CROSS-SECTION WASHER OD: — SIZE: — MATERIAL: — PN: 12539C18B · 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
•
STYLE DESIGNATOR: SPLIT HELICAL-RIGHT HAND
•
OUTSIDE DIAMETER: 0.413 INCHES NOMINAL IN
•
MATERIAL THICKNESS: 0.040 INCHES MINIMUM AND 0.080 INCHES MAXIMUM IN
•
MATERIAL: STEEL COMP 303 OR STEEL COMP 304 OR STEEL COMP 305 OVERALL
•
HOLE DIAMETER: 0.253 INCHES NOMINAL IN
TECHNICAL CHARACTERISTICS
STYLE DESIGNATORSPLIT HELICAL-RIGHT HAND
OUTSIDE DIAMETER0.413 INCHES NOMINAL IN
MATERIAL THICKNESS0.040 INCHES MINIMUM AND 0.080 INCHES MAXIMUM IN
MATERIALSTEEL COMP 303 OR STEEL COMP 304 OR STEEL COMP 305 OVERALL
HOLE DIAMETER0.253 INCHES NOMINAL IN
OTHER ITEMS IN FSC 5310 — Nuts and Washers
Items in the same Federal Supply class. No interchangeability or substitution relationship is implied.
5310-00-000-0040 5310-00-000-0077 5310-00-000-0079 5310-00-000-1146 5310-00-000-3815 5310-00-000-4532 5310-00-000-4540
SUBSTITUTES & CROSS-REFERENCES 1
12539C18Same NSN cross-reference
Same NSN cross-reference
Also cataloged under this NSN
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 12539C18B?
12539C18B is a WASHER,LOCK.
What parts can replace 12539C18B?
There is 1 known substitute for 12539C18B: 12539C18. Substitute compatibility should be verified for your specific system.
What is the NSN for 12539C18B?
12539C18B is cataloged in the U.S. Government catalog under NSN 5310-01-362-0361. 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.