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Technical Data Sheet
PartsTable / COMPONENT / 5-13-2512P31
5-13-2512P31 ✓ 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 WASHER,LOCK is a the manufacturer industrial component. This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 5310-00-933-8778, 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
5-13-2512P31
NSN: 5310-00-933-8778
FSC: 5310
CAGE: 81337 — W1D1 NATICK SOLDIER CENTER DBA US ARMY CCDC SOLDIER CENTER DIV COMBAT CAPABILITIES DEVELOPMENT COMMAND - SOLDIER CENTER (USA)
SPECIFICATIONS
Part Number5-13-2512P31
NSN5310-00-933-8778
COMPONENT DIAGRAM
NUT & WASHER — GRADE MATCHING REQUIRED Hex NUT CROSS-SECTION WASHER OD: — SIZE: — MATERIAL: — PN: 5-13-2512P31 · 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
VERIFIED SUBSTITUTES & CROSS-REFERENCES 25
187174Interchangeable
interchangeable cross-reference
interchangeable
MS35338-86Interchangeable
interchangeable cross-reference
interchangeable
UU-F-1206Interchangeable
interchangeable cross-reference
interchangeable
A-A-3071Interchangeable
interchangeable cross-reference
interchangeable
50488Interchangeable
interchangeable cross-reference
interchangeable
55-22368-68Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusCANCELLED
Availability—
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is 5-13-2512P31?
5-13-2512P31 is a WASHER,LOCK.
What parts can replace 5-13-2512P31?
There are 25 known substitutes for 5-13-2512P31: 187174, MS35338-86, UU-F-1206 and 22 more. Substitute compatibility should be verified for your specific system.
Is 5-13-2512P31 still available?
5-13-2512P31 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