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PartsTable / COMPONENT / USAF325-7
USAF325-7 ✓ 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,HEXAGON is a the manufacturer industrial component. Key specifications include material: STEEL COMP 1010 OVERALL, nut_style: HEXAGON, nut_height: 0.365 INCHES MINIMUM AND 0.385 INCHES MAXIMUM 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 5310-00-176-8169, 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
USAF325-7
NSN: 5310-00-176-8169
FSC: 5310
CAGE: 80049 — DEPARTMENT OF THE AIR FORCE (USA)
SPECIFICATIONS
materialSTEEL COMP 1010 OVERALL
nut_styleHEXAGON
nut_height0.365 INCHES MINIMUM AND 0.385 INCHES MAXIMUM IN
thread_class2B
thread_seriesUNF
thread_directionRIGHT-HAND
surface_treatmentCADMIUM OR ZINC OVERALL
width_across_flats0.675 INCHES MINIMUM AND 0.687 INCHES MAXIMUM IN
nominal_thread_size0.438 INCHES IN
bearing_surface_typeCHAMFERED OR WASHER FACED
thread_quantity_per_inch20
material_document_and_classificationQQ-S-630 FED SPEC SINGLE MATERIAL RESPONSE OVERALL
NSN5310-00-176-8169
COMPONENT DIAGRAM
NUT & WASHER — GRADE MATCHING REQUIRED Hex NUT CROSS-SECTION WASHER OD: — SIZE: — MATERIAL: — PN: USAF325-7 · 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: 0.675 INCHES MINIMUM AND 0.687 INCHES MAXIMUM IN
•
THREAD SERIES: UNF
•
THREAD QUANTITY PER INCH: 20
•
BEARING SURFACE TYPE: CHAMFERED OR WASHER FACED
•
NOMINAL THREAD SIZE: 0.438 INCHES IN
•
MATERIAL: STEEL COMP 1010 OVERALL
•
THREAD CLASS: 2B
•
MATERIAL DOCUMENT AND CLASSIFICATION: QQ-S-630 FED SPEC SINGLE MATERIAL RESPONSE OVERALL
TECHNICAL CHARACTERISTICS (FLIS)
WIDTH ACROSS FLATS0.675 INCHES MINIMUM AND 0.687 INCHES MAXIMUM IN
THREAD SERIESUNF
THREAD QUANTITY PER INCH20
BEARING SURFACE TYPECHAMFERED OR WASHER FACED
NOMINAL THREAD SIZE0.438 INCHES IN
MATERIALSTEEL COMP 1010 OVERALL
THREAD CLASS2B
MATERIAL DOCUMENT AND CLASSIFICATIONQQ-S-630 FED SPEC SINGLE MATERIAL RESPONSE OVERALL
NUT STYLEHEXAGON
SURFACE TREATMENTCADMIUM OR ZINC OVERALL
VERIFIED SUBSTITUTES & CROSS-REFERENCES 18
571242Interchangeable
interchangeable cross-reference
interchangeable
FFB571TYPEA2Interchangeable
interchangeable cross-reference
interchangeable
MILB857Interchangeable
interchangeable cross-reference
interchangeable
43-N-3938-4610Interchangeable
interchangeable cross-reference
interchangeable
H114AInterchangeable
interchangeable cross-reference
interchangeable
FFN836GRADEBTYPE3STYLE4Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusACTIVE
AvailabilityOEM and secondary market
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is USAF325-7?
USAF325-7 is a NUT,PLAIN,HEXAGON.
What parts can replace USAF325-7?
There are 18 known substitutes for USAF325-7: 571242, FFB571TYPEA2, MILB857 and 15 more. Substitute compatibility should be verified for your specific system.
What is the NSN for USAF325-7?
USAF325-7 is cataloged in the Federal Logistics Information System (FLIS) under NSN 5310-00-176-8169. 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