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PartsTable / COMPONENT / USAF330-20
USAF330-20 ✓ 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: 1.272 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 5310-00-176-8091, 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
USAF330-20
NSN: 5310-00-176-8091
FSC: 5310
CAGE: 80049 — DEPARTMENT OF THE AIR FORCE (USA)
SPECIFICATIONS
materialSTEEL OVERALL
nut_styleCASTELLATED, HEXAGON
nut_height1.272 INCHES NOMINAL IN
thread_class2B
thread_seriesUNF
thread_directionRIGHT-HAND
surface_treatmentCADMIUM AND ZINC OVERALL
width_across_flats1.875 INCHES NOMINAL IN
nominal_thread_size1.250 INCHES IN
bearing_surface_typeCHAMFERED OR WASHER FACED
thread_quantity_per_inch12
nondefinitive_spec/std_dataA4 TYPE
NSN5310-00-176-8091
COMPONENT DIAGRAM
NUT & WASHER — GRADE MATCHING REQUIRED Hex NUT CROSS-SECTION WASHER OD: — SIZE: — MATERIAL: — PN: USAF330-20 · 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
•
NUT STYLE: CASTELLATED, HEXAGON
•
THREAD QUANTITY PER INCH: 12
•
NOMINAL THREAD SIZE: 1.250 INCHES IN
•
THREAD CLASS: 2B
•
NONDEFINITIVE SPEC/STD DATA: A4 TYPE
•
BEARING SURFACE TYPE: CHAMFERED OR WASHER FACED
•
WIDTH ACROSS FLATS: 1.875 INCHES NOMINAL IN
•
THREAD DIRECTION: RIGHT-HAND
TECHNICAL CHARACTERISTICS (FLIS)
NUT STYLECASTELLATED, HEXAGON
THREAD QUANTITY PER INCH12
NOMINAL THREAD SIZE1.250 INCHES IN
THREAD CLASS2B
NONDEFINITIVE SPEC/STD DATAA4 TYPE
BEARING SURFACE TYPECHAMFERED OR WASHER FACED
WIDTH ACROSS FLATS1.875 INCHES NOMINAL IN
THREAD DIRECTIONRIGHT-HAND
SURFACE TREATMENTCADMIUM AND ZINC OVERALL
THREAD SERIESUNF
VERIFIED SUBSTITUTES & CROSS-REFERENCES 21
427132Interchangeable
interchangeable cross-reference
interchangeable
USAF330-4Interchangeable
interchangeable cross-reference
interchangeable
330-4Interchangeable
interchangeable cross-reference
interchangeable
FFB571TYPEA4Interchangeable
interchangeable cross-reference
interchangeable
330-5Interchangeable
interchangeable cross-reference
interchangeable
USAF330-5Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusACTIVE
AvailabilityOEM and secondary market
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is USAF330-20?
USAF330-20 is a NUT,PLAIN,CASTELLATED,HEXAGON.
What parts can replace USAF330-20?
There are 21 known substitutes for USAF330-20: 427132, USAF330-4, 330-4 and 18 more. Substitute compatibility should be verified for your specific system.
What is the NSN for USAF330-20?
USAF330-20 is cataloged in the Federal Logistics Information System (FLIS) under NSN 5310-00-176-8091. 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