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PartsTable / COMPONENT / FFB571TYPEB1
FFB571TYPEB1 ✓ 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,SQUARE is a the manufacturer industrial component. Key specifications include material: STEEL OVERALL, nut_style: SQUARE, nut_height: 0.249 INCHES MINIMUM AND 0.283 INCHES MAXIMUM IN, thread_class: 2B, thread_series: UNIFIED NATIONAL COARSE (UNC), 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 5310-00-010-5605, 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
FFB571TYPEB1
NSN: 5310-00-010-5605
FSC: 5310
CAGE: 81348 — FEDERAL SPECIFICATIONS PROMULGATED BY GENERAL SERVICES ADMINISTRATION WASHINGTON DC (USA)
SPECIFICATIONS
materialSTEEL OVERALL
nut_styleSQUARE
nut_height0.249 INCHES MINIMUM AND 0.283 INCHES MAXIMUM IN
thread_class2B
thread_seriesUNIFIED NATIONAL COARSE (UNC)
thread_directionRIGHT-HAND
surface_treatmentCADMIUM OR ZINC OVERALL
width_across_flats0.547 INCHES MINIMUM AND 0.5625 INCHES MAXIMUM IN
nominal_thread_size0.312 INCHES IN
bearing_surface_typeWASHER FACED
thread_quantity_per_inch18
NSN5310-00-010-5605
COMPONENT DIAGRAM
NUT & WASHER — GRADE MATCHING REQUIRED Hex NUT CROSS-SECTION WASHER OD: — SIZE: — MATERIAL: — PN: FFB571TYPEB1 · 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: SQUARE
•
THREAD DIRECTION: RIGHT-HAND
•
NUT HEIGHT: 0.249 INCHES MINIMUM AND 0.283 INCHES MAXIMUM IN
•
THREAD SERIES: UNIFIED NATIONAL COARSE (UNC)
•
BEARING SURFACE TYPE: WASHER FACED
•
THREAD QUANTITY PER INCH: 18
•
NOMINAL THREAD SIZE: 0.312 INCHES IN
•
WIDTH ACROSS FLATS: 0.547 INCHES MINIMUM AND 0.5625 INCHES MAXIMUM IN
TECHNICAL CHARACTERISTICS (FLIS)
NUT STYLESQUARE
THREAD DIRECTIONRIGHT-HAND
NUT HEIGHT0.249 INCHES MINIMUM AND 0.283 INCHES MAXIMUM IN
THREAD SERIESUNIFIED NATIONAL COARSE (UNC)
BEARING SURFACE TYPEWASHER FACED
THREAD QUANTITY PER INCH18
NOMINAL THREAD SIZE0.312 INCHES IN
WIDTH ACROSS FLATS0.547 INCHES MINIMUM AND 0.5625 INCHES MAXIMUM IN
MATERIALSTEEL OVERALL
THREAD CLASS2B
VERIFIED SUBSTITUTES & CROSS-REFERENCES 15
900405Interchangeable
interchangeable cross-reference
interchangeable
105606Interchangeable
interchangeable cross-reference
interchangeable
105609Interchangeable
interchangeable cross-reference
interchangeable
FFB571TYPEB1Interchangeable
interchangeable cross-reference
interchangeable
105611Interchangeable
interchangeable cross-reference
interchangeable
125550Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusACTIVE
AvailabilityOEM and secondary market
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is FFB571TYPEB1?
FFB571TYPEB1 is a NUT,PLAIN,SQUARE.
What parts can replace FFB571TYPEB1?
There are 15 known substitutes for FFB571TYPEB1: 900405, 105606, 105609 and 12 more. Substitute compatibility should be verified for your specific system.
What is the NSN for FFB571TYPEB1?
FFB571TYPEB1 is cataloged in the Federal Logistics Information System (FLIS) under NSN 5310-00-010-5605. 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