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Technical Data Sheet
PartsTable / COMPONENT / FFB584TYPE1CLASS1TYPEA
FFB584TYPE1CLASS1TYPEA ✓ 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,SQUARE NECK is a the manufacturer industrial component. Key specifications include material: STEEL OVERALL, head_style: BUTTON, neck_width: 0.616 INCHES MINIMUM AND 0.642 INCHES MAXIMUM IN, head_height: 0.313 INCHES MINIMUM AND 0.344 INCHES MAXIMUM IN, neck_length: 0.313 INCHES MINIMUM AND 0.344 INCHES MAXIMUM IN, thread_class: 2A A. This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 5306-00-248-8700, 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
FFB584TYPE1CLASS1TYPEA
NSN: 5306-00-248-8700
FSC: 5306
CAGE: 81348 — FEDERAL SPECIFICATIONS PROMULGATED BY GENERAL SERVICES ADMINISTRATION WASHINGTON DC (USA)
SPECIFICATIONS
materialSTEEL OVERALL
head_styleBUTTON
neck_width0.616 INCHES MINIMUM AND 0.642 INCHES MAXIMUM IN
head_height0.313 INCHES MINIMUM AND 0.344 INCHES MAXIMUM IN
neck_length0.313 INCHES MINIMUM AND 0.344 INCHES MAXIMUM IN
thread_class2A A
head_diameter1.219 INCHES MINIMUM AND 1.344 INCHES MAXIMUM IN
thread_length1.750 INCHES MINIMUM IN
fastener_length8.000 INCHES NOMINAL IN
hardness_rating95.0 ROCKWELL B MAXIMUM OVERALL
thread_directionRIGHT-HAND
surface_treatmentZINC OVERALL
NSN5306-00-248-8700
COMPONENT DIAGRAM
BOLT / SCREW — THREAD VERIFICATION REQUIRED Hex HEAD LENGTH: — THREAD: — × — MATERIAL: — PN: FFB584TYPE1CLASS1TYPEA · 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
•
HEAD DIAMETER: 1.219 INCHES MINIMUM AND 1.344 INCHES MAXIMUM IN
•
HARDNESS RATING: 95.0 ROCKWELL B MAXIMUM OVERALL
•
NONDEFINITIVE SPEC/STD DATA: 1 TYPE AND A STYLE AND 1 CLASS
•
MATERIAL DOCUMENT AND CLASSIFICATION: FF-B-584 FED SPEC SINGLE MATERIAL RESPONSE OVERALL
•
THREAD SERIES DESIGNATOR: UNIFIED NATIONAL COARSE (UNC)
•
NECK WIDTH: 0.616 INCHES MINIMUM AND 0.642 INCHES MAXIMUM IN
•
THREAD QUANTITY PER INCH: 11
•
THREAD DIRECTION: RIGHT-HAND
TECHNICAL CHARACTERISTICS (FLIS)
HEAD DIAMETER1.219 INCHES MINIMUM AND 1.344 INCHES MAXIMUM IN
HARDNESS RATING95.0 ROCKWELL B MAXIMUM OVERALL
NONDEFINITIVE SPEC/STD DATA1 TYPE AND A STYLE AND 1 CLASS
MATERIAL DOCUMENT AND CLASSIFICATIONFF-B-584 FED SPEC SINGLE MATERIAL RESPONSE OVERALL
THREAD SERIES DESIGNATORUNIFIED NATIONAL COARSE (UNC)
NECK WIDTH0.616 INCHES MINIMUM AND 0.642 INCHES MAXIMUM IN
THREAD QUANTITY PER INCH11
THREAD DIRECTIONRIGHT-HAND
FASTENER LENGTH8.000 INCHES NOMINAL IN
NOMINAL THREAD DIAMETER0.625 INCHES IN
VERIFIED SUBSTITUTES & CROSS-REFERENCES 10
MS35751-53Upgraded Successor
successor cross-reference
successor
FFB584Upgraded Successor
successor cross-reference
successor
119430Upgraded Successor
successor cross-reference
successor
21260Upgraded Successor
successor cross-reference
successor
120231Upgraded Successor
successor cross-reference
successor
NASM35751Upgraded Successor
successor cross-reference
successor
LIFECYCLE
StatusCANCELLED
Availability—
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is FFB584TYPE1CLASS1TYPEA?
FFB584TYPE1CLASS1TYPEA is a BOLT,SQUARE NECK.
What parts can replace FFB584TYPE1CLASS1TYPEA?
There are 10 known substitutes for FFB584TYPE1CLASS1TYPEA: MS35751-53, FFB584, 119430 and 7 more. Substitute compatibility should be verified for your specific system.
Is FFB584TYPE1CLASS1TYPEA still available?
FFB584TYPE1CLASS1TYPEA 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