PartsTable
Technical Data Sheet
FF-B-561D ✓ 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 SCREW,LAG is a the manufacturer industrial component. Key specifications include material: STEEL OVERALL, head_style: HEXAGON, head_height: 0.378 INCHES MINIMUM AND 0.444 INCHES MAXIMUM IN, shoulder_shape: ROUND FIRST SHOULDER, fastener_length: 8.000 INCHES NOMINAL IN, hardness_rating: 60.0 ROCKWELL B MINIMUM OVERALL. This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 5305-00-177-5624, 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
FF-B-561D
NSN: 5305-00-177-5624
FSC: 5305
CAGE: 81348 — FEDERAL SPECIFICATIONS PROMULGATED BY GENERAL SERVICES ADMINISTRATION WASHINGTON DC (USA)
SPECIFICATIONS
materialSTEEL OVERALL
head_styleHEXAGON
head_height0.378 INCHES MINIMUM AND 0.444 INCHES MAXIMUM IN
shoulder_shapeROUND FIRST SHOULDER
fastener_length8.000 INCHES NOMINAL IN
hardness_rating60.0 ROCKWELL B MINIMUM OVERALL
shoulder_length0.312 INCHES MINIMUM FIRST SHOULDER IN
shoulder_diameter0.605 INCHES MINIMUM AND 0.642 INCHES MAXIMUM FIRST SHOULDER IN
surface_treatmentZINC OVERALL
width_between_flats0.906 INCHES MINIMUM AND 0.938 INCHES MAXIMUM IN
nonmachine_thread_styleGIMLET POINT (TYPE A, AB OR BA)
minimum_tensile_strength55000 POUNDS PER SQUARE INCH LBS
NSN5305-00-177-5624
COMPONENT DIAGRAM
BOLT / SCREW — THREAD VERIFICATION REQUIRED Hex HEAD LENGTH: — THREAD: — × — MATERIAL: — PN: FF-B-561D · 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
SHOULDER LENGTH: 0.312 INCHES MINIMUM FIRST SHOULDER IN
HEAD STYLE: HEXAGON
HARDNESS RATING: 60.0 ROCKWELL B MINIMUM OVERALL
NONDEFINITIVE SPEC/STD DATA: 1 TYPE AND 1 STYLE AND B GRADE
HEAD HEIGHT: 0.378 INCHES MINIMUM AND 0.444 INCHES MAXIMUM IN
NONMACHINE NOMINAL THREAD DIAMETER: 0.625 INCHES IN
WIDTH BETWEEN FLATS: 0.906 INCHES MINIMUM AND 0.937 INCHES MAXIMUM IN
SURFACE TREATMENT: ZINC OVERALL
TECHNICAL CHARACTERISTICS (FLIS)
SHOULDER LENGTH0.312 INCHES MINIMUM FIRST SHOULDER IN
HEAD STYLEHEXAGON
HARDNESS RATING60.0 ROCKWELL B MINIMUM OVERALL
NONDEFINITIVE SPEC/STD DATA1 TYPE AND 1 STYLE AND B GRADE
HEAD HEIGHT0.378 INCHES MINIMUM AND 0.444 INCHES MAXIMUM IN
NONMACHINE NOMINAL THREAD DIAMETER0.625 INCHES IN
WIDTH BETWEEN FLATS0.906 INCHES MINIMUM AND 0.937 INCHES MAXIMUM IN
SURFACE TREATMENTZINC OVERALL
FASTENER LENGTH5.000 INCHES NOMINAL IN
NONMACHINE THREAD STYLEGIMLET POINT (TYPE A, AB OR BA)
VERIFIED SUBSTITUTES & CROSS-REFERENCES 7
MS16992-566Interchangeable
interchangeable cross-reference
interchangeable
FF-B-561DInterchangeable
interchangeable cross-reference
interchangeable
FFB561TYPEVGRADECInterchangeable
interchangeable cross-reference
interchangeable
5371Interchangeable
interchangeable cross-reference
interchangeable
MS16992-610Interchangeable
interchangeable cross-reference
interchangeable
FFB561Interchangeable
Same NIIN cross-reference
interchangeable
LIFECYCLE
StatusCANCELLED
Availability
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is FF-B-561D?
FF-B-561D is a SCREW,LAG.
What parts can replace FF-B-561D?
There are 7 known substitutes for FF-B-561D: MS16992-566, FF-B-561D, FFB561TYPEVGRADEC and 4 more. Substitute compatibility should be verified for your specific system.
Is FF-B-561D still available?
FF-B-561D is currently cancelled.
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