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PartsTable / COMPONENT / FFB571ATYPEB1CLASSC
FFB571ATYPEB1CLASSC ✓ Verified by PartsTable
— · BOLT SCREW
WHAT YOU NEED TO KNOW
Grade/class stamped on head determines strength Metric and imperial threads look similar — measure pitch
Verify thread pitch — metric != imperial
PRODUCT OVERVIEW

The BOLT,MACHINE is a the manufacturer industrial component. Key specifications include material: STEEL OVERALL, head_style: HEXAGON, head_height: 0.317 INCHES NOMINAL IN, thread_class: 2A A, thread_length: 1.250 INCHES MINIMUM IN, fastener_length: 3.750 INCHES NOMINAL IN. This product is currently in active production with full OEM support.

This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 5306-00-150-9311, 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
FFB571ATYPEB1CLASSC
NSN: 5306-00-150-9311
FSC: 5306
CAGE: 81348 — FEDERAL SPECIFICATIONS PROMULGATED BY GENERAL SERVICES ADMINISTRATION WASHINGTON DC (USA)
SPECIFICATIONS
materialSTEEL OVERALL
head_styleHEXAGON
head_height0.317 INCHES NOMINAL IN
thread_class2A A
thread_length1.250 INCHES MINIMUM IN
fastener_length3.750 INCHES NOMINAL IN
thread_directionRIGHT-HAND
features_providedFINISHED HEAD
surface_treatmentCADMIUM OR ZINC OVERALL
width_between_flats0.750 INCHES NOMINAL IN
nominal_thread_diameter0.500 INCHES IN
thread_quantity_per_inch20
NSN5306-00-150-9311
COMPONENT DIAGRAM
BOLT / SCREW — THREAD VERIFICATION REQUIRED Hex HEAD LENGTH: — THREAD: — × — MATERIAL: — PN: FFB571ATYPEB1CLASSC · OEM ⚠ VERIFY BEFORE ORDERING Verify thread pitch before ordering — metric (M8×1.25) ≠ imperial (5/16-18). Wrong thread = wrong part. Grade/class stamped on bolt head determines tensile strength ✓ BROKER TIP Grade/class stamped on head determines tensile strength. Grade 8 > Grade 5 > Grade 2. Always confirm head marking matches specification requirement PARTSTABLE TECHNICAL DRAWING — NOT TO SCALE
KEY FEATURES
•
FASTENER LENGTH: 3.750 INCHES NOMINAL IN
•
THREAD SERIES DESIGNATOR: UNF
•
THREAD CLASS: 2A A
•
NONDEFINITIVE SPEC/STD DATA: B-2 TYPE AND C CLASS
•
HEAD STYLE: HEXAGON
•
MATERIAL: STEEL OVERALL
•
THREAD QUANTITY PER INCH: 20
•
HEAD HEIGHT: 0.317 INCHES NOMINAL IN
TECHNICAL CHARACTERISTICS (FLIS)
FASTENER LENGTH3.750 INCHES NOMINAL IN
THREAD SERIES DESIGNATORUNF
THREAD CLASS2A A
NONDEFINITIVE SPEC/STD DATAB-2 TYPE AND C CLASS
HEAD STYLEHEXAGON
MATERIALSTEEL OVERALL
THREAD QUANTITY PER INCH20
HEAD HEIGHT0.317 INCHES NOMINAL IN
THREAD DIRECTIONRIGHT-HAND
SURFACE TREATMENTCADMIUM OR ZINC OVERALL
VERIFIED SUBSTITUTES & CROSS-REFERENCES 15
MIL-DTL-1222JUpgraded Successor
successor cross-reference
successor
FFB571ANDTYPEB2ANDCLASSCUpgraded Successor
successor cross-reference
successor
60-9-12Upgraded Successor
successor cross-reference
successor
65-7-20Upgraded Successor
successor cross-reference
successor
FF-S-85 TY II STY 10P GR 2Upgraded Successor
successor cross-reference
successor
MILB857TYPE2GRADE2Upgraded Successor
successor cross-reference
successor
LIFECYCLE
StatusACTIVE
AvailabilityOEM and secondary market
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is FFB571ATYPEB1CLASSC?
FFB571ATYPEB1CLASSC is a BOLT,MACHINE.
What parts can replace FFB571ATYPEB1CLASSC?
There are 15 known substitutes for FFB571ATYPEB1CLASSC: MIL-DTL-1222J, FFB571ANDTYPEB2ANDCLASSC, 60-9-12 and 12 more. Substitute compatibility should be verified for your specific system.
What is the NSN for FFB571ATYPEB1CLASSC?
FFB571ATYPEB1CLASSC is cataloged in the Federal Logistics Information System (FLIS) under NSN 5306-00-150-9311. 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