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PartsTable / COMPONENT / USAF330-9
USAF330-9 ✓ 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 NUT,PLAIN,CASTELLATED,HEXAGON is a the manufacturer industrial component. Key specifications include material: STEEL OVERALL, nut_style: CASTELLATED, HEXAGON, nut_height: 0.620 INCHES NOMINAL IN, thread_class: 2B, thread_series: UNF, thread_direction: RIGHT-HAND. This product is currently in active production with full OEM support.

This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 5310-00-176-7902, 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
USAF330-9
NSN: 5310-00-176-7902
FSC: 5310
CAGE: 80049 — DEPARTMENT OF THE AIR FORCE (USA)
SPECIFICATIONS
materialSTEEL OVERALL
nut_styleCASTELLATED, HEXAGON
nut_height0.620 INCHES NOMINAL IN
thread_class2B
thread_seriesUNF
thread_directionRIGHT-HAND
surface_treatmentCADMIUM OR ZINC OVERALL
width_across_flats0.875 INCHES NOMINAL IN
nominal_thread_size0.562 INCHES IN
bearing_surface_typeCHAMFERED OR WASHER FACED
thread_quantity_per_inch18
nondefinitive_spec/std_dataA4 TYPE
NSN5310-00-176-7902
COMPONENT DIAGRAM
NUT & WASHER — GRADE MATCHING REQUIRED Hex NUT CROSS-SECTION WASHER OD: — SIZE: — MATERIAL: — PN: USAF330-9 · 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
•
THREAD SERIES: UNF
•
THREAD QUANTITY PER INCH: 18
•
MATERIAL: STEEL OVERALL
•
NONDEFINITIVE SPEC/STD DATA: A4 TYPE
•
NOMINAL THREAD SIZE: 0.562 INCHES IN
•
SURFACE TREATMENT: CADMIUM OR ZINC OVERALL
•
NUT HEIGHT: 0.620 INCHES NOMINAL IN
•
NUT STYLE: CASTELLATED, HEXAGON
TECHNICAL CHARACTERISTICS (FLIS)
THREAD SERIESUNF
THREAD QUANTITY PER INCH18
MATERIALSTEEL OVERALL
NONDEFINITIVE SPEC/STD DATAA4 TYPE
NOMINAL THREAD SIZE0.562 INCHES IN
SURFACE TREATMENTCADMIUM OR ZINC OVERALL
NUT HEIGHT0.620 INCHES NOMINAL IN
NUT STYLECASTELLATED, HEXAGON
THREAD CLASS2B
WIDTH ACROSS FLATS0.875 INCHES NOMINAL IN
VERIFIED SUBSTITUTES & CROSS-REFERENCES 21
427132Interchangeable
interchangeable cross-reference
interchangeable
131-309-3Interchangeable
interchangeable cross-reference
interchangeable
ST293Interchangeable
interchangeable cross-reference
interchangeable
USAF330-4Interchangeable
interchangeable cross-reference
interchangeable
330-4Interchangeable
interchangeable cross-reference
interchangeable
FFB571TYPEA4Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusACTIVE
AvailabilityOEM and secondary market
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is USAF330-9?
USAF330-9 is a NUT,PLAIN,CASTELLATED,HEXAGON.
What parts can replace USAF330-9?
There are 21 known substitutes for USAF330-9: 427132, 131-309-3, ST293 and 18 more. Substitute compatibility should be verified for your specific system.
What is the NSN for USAF330-9?
USAF330-9 is cataloged in the Federal Logistics Information System (FLIS) under NSN 5310-00-176-7902. This indicates validated use in U.S. government and defense supply chains.
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✓ Validated with multiple authoritative sources, including Government, OEM, and Certified sources.
PartsTable Design LLC · partstable.com
Last verified: July 2026