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FFB571 ✓ 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 OVERALL, nut_style: HEXAGON, head_style: HEXAGON, neck_width: 0.375 INCHES NOMINAL IN, nut_height: 0.724 INCHES MINIMUM AND 0.776 INCHES MAXIMUM IN, grip_length: 2.000 INCHES NOMINAL IN. This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 5310-00-010-3025, 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
FFB571
NSN: 5310-00-010-3025
FSC: 5310
CAGE: 81348 — FEDERAL SPECIFICATIONS PROMULGATED BY GENERAL SERVICES ADMINISTRATION WASHINGTON DC (USA)
SPECIFICATIONS
materialSTEEL OVERALL
nut_styleHEXAGON
head_styleHEXAGON
neck_width0.375 INCHES NOMINAL IN
nut_height0.724 INCHES MINIMUM AND 0.776 INCHES MAXIMUM IN
grip_length2.000 INCHES NOMINAL IN
head_height0.365 INCHES MINIMUM AND 0.386 INCHES MAXIMUM IN
neck_length0.281 INCHES NOMINAL IN
thread_class2B
head_diameter0.813 INCHES NOMINAL IN
thread_length1.000 INCHES MINIMUM IN
thread_seriesUNF
NSN5310-00-010-3025
COMPONENT DIAGRAM
NUT & WASHER — GRADE MATCHING REQUIRED Hex NUT CROSS-SECTION WASHER OD: — SIZE: — MATERIAL: — PN: FFB571 · 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
TECHNICAL CHARACTERISTICS (FLIS)
SPECIAL FEATURESSQUARE NUT; HEAVY
VERIFIED SUBSTITUTES & CROSS-REFERENCES 25
10302-5Interchangeable
interchangeable cross-reference
interchangeable
10302Interchangeable
interchangeable cross-reference
interchangeable
7962Interchangeable
interchangeable cross-reference
interchangeable
7985Interchangeable
interchangeable cross-reference
interchangeable
25-115Interchangeable
interchangeable cross-reference
interchangeable
FFN836Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusCANCELLED
Availability—
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is FFB571?
FFB571 is a NUT,PLAIN,HEXAGON.
What parts can replace FFB571?
There are 25 known substitutes for FFB571: 10302-5, 10302, 7962 and 22 more. Substitute compatibility should be verified for your specific system.
Is FFB571 still available?
FFB571 is currently cancelled.
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✓ Validated with multiple authoritative sources, including Government, OEM, and Certified sources.
PartsTable Design LLC · partstable.com
Last verified: July 2026