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9A991D — NUT,SELF-LOCKING,HEXAGON

✓ Government record, cited
— · NUT WASHER
PRODUCT OVERVIEW

9A991D: NUT,SELF-LOCKING,HEXAGON.

The NUT,SELF-LOCKING,HEXAGON is a the manufacturer industrial component. Key specifications include nut_style: HEXAGON, nut_height: 3.000 INCHES NOMINAL IN, width_across_flats: 0.200 INCHES NOMINAL IN, nut_counterbore_depth: 0.100 INCHES NOMINAL NUT IN. This part is cataloged in the U.S.

Government catalog under NSN 5310-01-560-0031, 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
9A991D
NSN: 5310-01-560-0031
FSC: 5310 — Nuts and Washers
CAGE: 14711 — RSA ENGINEERED PRODUCTS, LLC DBA RSA ENGINEERED PRODUCTS LLC (USA)
SPECIFICATIONS
nut_styleHEXAGON
nut_height3.000 INCHES NOMINAL IN
width_across_flats0.200 INCHES NOMINAL IN
nut_counterbore_depth0.100 INCHES NOMINAL NUT IN
NSN5310-01-560-0031
COMPONENT DIAGRAM
NUT & WASHER — GRADE MATCHING REQUIRED Hex NUT CROSS-SECTION WASHER OD: — SIZE: — MATERIAL: — PN: 9A991D · 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
•
WIDTH ACROSS FLATS: 0.200 INCHES NOMINAL IN
•
NUT COUNTERBORE DEPTH: 0.100 INCHES NOMINAL NUT IN
•
NUT HEIGHT: 3.000 INCHES NOMINAL IN
•
NUT STYLE: HEXAGON
TECHNICAL CHARACTERISTICS
WIDTH ACROSS FLATS0.200 INCHES NOMINAL IN
NUT COUNTERBORE DEPTH0.100 INCHES NOMINAL NUT IN
NUT HEIGHT3.000 INCHES NOMINAL IN
NUT STYLEHEXAGON
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
No demilitarization required
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FREQUENTLY ASKED QUESTIONS
What is 9A991D?
9A991D is a NUT,SELF-LOCKING,HEXAGON.
What is the NSN for 9A991D?
9A991D is cataloged in the U.S. Government catalog under NSN 5310-01-560-0031. 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.