PartsTable
Technical Data Sheet
FFB571A ✓ 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 BOLT,MACHINE is a the manufacturer industrial component. Key specifications include material: STEEL OVERALL, nut_style: HEXAGON, head_style: HEXAGON, nut_height: 0.212 INCHES MINIMUM AND 0.226 INCHES MAXIMUM IN, grip_length: 0.250 INCHES NOMINAL IN, head_height: 0.252 INCHES NOMINAL IN. This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 5310-00-012-0367, 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
FFB571A
NSN: 5310-00-012-0367
FSC: 5310
CAGE: 81348 — FEDERAL SPECIFICATIONS PROMULGATED BY GENERAL SERVICES ADMINISTRATION WASHINGTON DC (USA)
SPECIFICATIONS
materialSTEEL OVERALL
nut_styleHEXAGON
head_styleHEXAGON
nut_height0.212 INCHES MINIMUM AND 0.226 INCHES MAXIMUM IN
grip_length0.250 INCHES NOMINAL IN
head_height0.252 INCHES NOMINAL IN
thread_class2A A
thread_length0.750 INCHES MINIMUM IN
thread_seriesUNF
fastener_length1.000 INCHES NOMINAL IN
thread_directionRIGHT-HAND
features_providedFINISHED HEAD
NSN5310-00-012-0367
COMPONENT DIAGRAM
NUT & WASHER — GRADE MATCHING REQUIRED Hex NUT CROSS-SECTION WASHER OD: — SIZE: — MATERIAL: — PN: FFB571A · 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
THREAD CLASS: 2B
NUT HEIGHT: 0.212 INCHES MINIMUM AND 0.226 INCHES MAXIMUM IN
THREAD SERIES: UNF
THREAD QUANTITY PER INCH: 28
NOMINAL THREAD SIZE: 0.250 INCHES IN
BEARING SURFACE TYPE: CHAMFERED OR WASHER FACED
SURFACE TREATMENT: CADMIUM OR ZINC OVERALL
MATERIAL: STEEL OVERALL
TECHNICAL CHARACTERISTICS (FLIS)
THREAD CLASS2B
NUT HEIGHT0.212 INCHES MINIMUM AND 0.226 INCHES MAXIMUM IN
THREAD SERIESUNF
THREAD QUANTITY PER INCH28
NOMINAL THREAD SIZE0.250 INCHES IN
BEARING SURFACE TYPECHAMFERED OR WASHER FACED
SURFACE TREATMENTCADMIUM OR ZINC OVERALL
MATERIALSTEEL OVERALL
THREAD DIRECTIONRIGHT-HAND
SURFACE TREATMENT DOCUMENT AND CLASSIFICATIONQQ-P-416,TYPE 2,CLASS 3 FED SPEC SINGLE TREATMENT RESPONSE OR QQ-Z-325,TYPE 2,CLASS 3 FED SPEC SINGLE TREATMENT RESPONSE OVERALL
VERIFIED SUBSTITUTES & CROSS-REFERENCES 26
70398Interchangeable
interchangeable cross-reference
interchangeable
FFB571AInterchangeable
interchangeable cross-reference
interchangeable
A-A-2329Interchangeable
interchangeable cross-reference
interchangeable
GGG-F-325 TY27CL1STAInterchangeable
interchangeable cross-reference
interchangeable
19136Interchangeable
interchangeable cross-reference
interchangeable
60-6-10Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusCANCELLED
Availability
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is FFB571A?
FFB571A is a BOLT,MACHINE.
What parts can replace FFB571A?
There are 26 known substitutes for FFB571A: 70398, FFB571A, A-A-2329 and 23 more. Substitute compatibility should be verified for your specific system.
Is FFB571A still available?
FFB571A is currently cancelled.
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