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12991533B — WASHER,BEVEL

✓ Government record, cited
— · NUT WASHER
PRODUCT OVERVIEW

12991533B: WASHER,BEVEL.

The WASHER,BEVEL is a the manufacturer industrial component. Key specifications include special_features: USED FOR TIMING (POSITIONING) SUPPRESSOR AND MUZZLE BRAKE INSTALLATIONS; ONE TIME USE ONLY, style_designator: SPRING TENSION, end_item_identification: M4A3 CARBINE. This part is cataloged in the U.S.

Government catalog under NSN 5310-01-547-6483, 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
12991533B
NSN: 5310-01-547-6483
FSC: 5310 — Nuts and Washers
CAGE: 7Z500 — BUSHMASTER FIREARMS INTERNATIONAL, LLC (USA)
SPECIFICATIONS
special_featuresUSED FOR TIMING (POSITIONING) SUPPRESSOR AND MUZZLE BRAKE INSTALLATIONS; ONE TIME USE ONLY
style_designatorSPRING TENSION
end_item_identificationM4A3 CARBINE
NSN5310-01-547-6483
COMPONENT DIAGRAM
NUT & WASHER — GRADE MATCHING REQUIRED Hex NUT CROSS-SECTION WASHER OD: — SIZE: — MATERIAL: — PN: 12991533B · 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: SPRING TENSION
TECHNICAL CHARACTERISTICS
STYLE DESIGNATORSPRING TENSION
SPECIAL FEATURESUSED FOR TIMING (POSITIONING) SUPPRESSOR AND MUZZLE BRAKE INSTALLATIONS; ONE TIME USE ONLY
END ITEM IDENTIFICATIONM4A3 CARBINE
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

No substitute or cross-reference records for this part.

LIFECYCLE
NSN statusActive· U.S. Government catalog
Demilitarization required — mutilation
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FREQUENTLY ASKED QUESTIONS
What is 12991533B?
12991533B is a WASHER,BEVEL.
What is the NSN for 12991533B?
12991533B is cataloged in the U.S. Government catalog under NSN 5310-01-547-6483. 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.