PartsTable
Technical Data Sheet
PartsTable / COMPONENT / USAF330-4
USAF330-4 ✓ 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: 0.288 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 5310-00-176-7897, 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
USAF330-4
NSN: 5310-00-176-7897
FSC: 5310
CAGE: 80049 — DEPARTMENT OF THE AIR FORCE (USA)
SPECIFICATIONS
materialSTEEL OVERALL
nut_styleCASTELLATED, HEXAGON
nut_height0.288 INCHES NOMINAL IN
thread_class2B
thread_seriesUNF
thread_directionRIGHT-HAND
surface_treatmentCADMIUM OR ZINC OVERALL
width_across_flats0.438 INCHES NOMINAL IN
nominal_thread_size0.250 INCHES IN
bearing_surface_typeCHAMFERED OR WASHER FACED
thread_quantity_per_inch28
NSN5310-00-176-7897
COMPONENT DIAGRAM
NUT & WASHER — GRADE MATCHING REQUIRED Hex NUT CROSS-SECTION WASHER OD: — SIZE: — MATERIAL: — PN: USAF330-4 · 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
•
NOMINAL THREAD SIZE: 0.250 INCHES IN
•
THREAD CLASS: 2B
•
WIDTH ACROSS FLATS: 0.438 INCHES NOMINAL IN
•
NUT STYLE: CASTELLATED, HEXAGON
•
SURFACE TREATMENT: CADMIUM OR ZINC OVERALL
•
THREAD DIRECTION: RIGHT-HAND
•
MATERIAL: STEEL OVERALL
•
THREAD SERIES: UNF
TECHNICAL CHARACTERISTICS (FLIS)
NOMINAL THREAD SIZE0.250 INCHES IN
THREAD CLASS2B
WIDTH ACROSS FLATS0.438 INCHES NOMINAL IN
NUT STYLECASTELLATED, HEXAGON
SURFACE TREATMENTCADMIUM OR ZINC OVERALL
THREAD DIRECTIONRIGHT-HAND
MATERIALSTEEL OVERALL
THREAD SERIESUNF
NUT HEIGHT0.288 INCHES NOMINAL IN
BEARING SURFACE TYPECHAMFERED OR WASHER FACED
VERIFIED SUBSTITUTES & CROSS-REFERENCES 21
427132Interchangeable
interchangeable cross-reference
interchangeable
330-5Interchangeable
interchangeable cross-reference
interchangeable
FFB571TYPEA4Interchangeable
interchangeable cross-reference
interchangeable
USAF330-5Interchangeable
interchangeable cross-reference
interchangeable
330-6Interchangeable
interchangeable cross-reference
interchangeable
USAF330-6Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusACTIVE
AvailabilityOEM and secondary market
RoHS CompliantEAR99Not HAZMAT
Ready to buy USAF330-4?
Compare prices from verified sellers on eBay
Buy on eBay →
As an eBay Partner, PartsTable may earn a commission. Your price is not affected.
FREQUENTLY ASKED QUESTIONS
What is USAF330-4?
USAF330-4 is a NUT,PLAIN,CASTELLATED,HEXAGON.
What parts can replace USAF330-4?
There are 21 known substitutes for USAF330-4: 427132, 330-5, FFB571TYPEA4 and 18 more. Substitute compatibility should be verified for your specific system.
What is the NSN for USAF330-4?
USAF330-4 is cataloged in the Federal Logistics Information System (FLIS) under NSN 5310-00-176-7897. This indicates validated use in U.S. government and defense supply chains.
Community Feedback
Comments (0)
No comments yet. Be the first to share what you know.
Leave a Comment
Comments are reviewed before appearing. You will receive an email to verify before your comment appears.

Request a Quote — USAF330-4

✓ Validated with multiple authoritative sources, including Government, OEM, and Certified sources.
PartsTable Design LLC · partstable.com
Last verified: July 2026