PartsTable
Technical Data Sheet
FFB571ATYPEB1 ✓ 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: 0.356 INCHES MINIMUM AND 0.394 INCHES MAXIMUM IN, thread_class: 2B, thread_series: UNIFIED NATIONAL COARSE (UNC), thread_direction: RIGHT-HAND. This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 5310-00-010-5604, 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
FFB571ATYPEB1
NSN: 5310-00-010-5604
FSC: 5310
CAGE: 81348 — FEDERAL SPECIFICATIONS PROMULGATED BY GENERAL SERVICES ADMINISTRATION WASHINGTON DC (USA)
SPECIFICATIONS
materialSTEEL OVERALL
nut_styleSQUARE
nut_height0.356 INCHES MINIMUM AND 0.394 INCHES MAXIMUM IN
thread_class2B
thread_seriesUNIFIED NATIONAL COARSE (UNC)
thread_directionRIGHT-HAND
width_across_flats0.728 INCHES MINIMUM AND 0.750 INCHES MAXIMUM IN
nominal_thread_size0.438 INCHES IN
bearing_surface_typeWASHER FACED
thread_quantity_per_inch20
nondefinitive_spec/std_data1 TYPE AND 1 STYLE AND A GRADE
NSN5310-00-010-5604
COMPONENT DIAGRAM
NUT & WASHER — GRADE MATCHING REQUIRED Hex NUT CROSS-SECTION WASHER OD: — SIZE: — MATERIAL: — PN: FFB571ATYPEB1 · 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
BEARING SURFACE TYPE: WASHER FACED
THREAD QUANTITY PER INCH: 20
THREAD SERIES: UNIFIED NATIONAL COARSE (UNC)
NOMINAL THREAD SIZE: 0.250 INCHES IN
WIDTH ACROSS FLATS: 0.425 INCHES MINIMUM AND 0.4375 INCHES MAXIMUM IN
MATERIAL: STEEL OVERALL
THREAD DIRECTION: RIGHT-HAND
THREAD CLASS: 2B
TECHNICAL CHARACTERISTICS (FLIS)
BEARING SURFACE TYPEWASHER FACED
THREAD QUANTITY PER INCH20
THREAD SERIESUNIFIED NATIONAL COARSE (UNC)
NOMINAL THREAD SIZE0.250 INCHES IN
WIDTH ACROSS FLATS0.425 INCHES MINIMUM AND 0.4375 INCHES MAXIMUM IN
MATERIALSTEEL OVERALL
THREAD DIRECTIONRIGHT-HAND
THREAD CLASS2B
NUT STYLESQUARE
NUT HEIGHT0.203 INCHES MINIMUM AND 0.235 INCHES MAXIMUM IN
VERIFIED SUBSTITUTES & CROSS-REFERENCES 10
105607Interchangeable
interchangeable cross-reference
interchangeable
FFB571ATYPEB1Interchangeable
interchangeable cross-reference
interchangeable
105-0604-001Interchangeable
interchangeable cross-reference
interchangeable
105-604-1Interchangeable
interchangeable cross-reference
interchangeable
20149AInterchangeable
interchangeable cross-reference
interchangeable
105604Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusCANCELLED
Availability
RoHS CompliantEAR99Not HAZMAT
Ready to buy FFB571ATYPEB1?
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 FFB571ATYPEB1?
FFB571ATYPEB1 is a NUT,PLAIN,SQUARE.
What parts can replace FFB571ATYPEB1?
There are 10 known substitutes for FFB571ATYPEB1: 105607, FFB571ATYPEB1, 105-0604-001 and 7 more. Substitute compatibility should be verified for your specific system.
Is FFB571ATYPEB1 still available?
FFB571ATYPEB1 is currently cancelled.
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 — FFB571ATYPEB1