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Technical Data Sheet
PartsTable / COMPONENT / FFB561TYPEVGRADEC
FFB561TYPEVGRADEC ✓ 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 COMP 302 OR STEEL COMP 303 OR STEEL COMP 304 OR STEEL COMP 305 OR STEEL COMP 310 OR STEEL COMP 316 OVERALL, head_style: HEXAGON, head_height: 0.328 INCHES NOMINAL IN, fastener_length: 4.500 INCHES NOMINAL IN, surface_treatment: PASSIVATE OVERALL, width_between_flats: 0.750 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 5305-00-407-6543, 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
FFB561TYPEVGRADEC
NSN: 5305-00-407-6543
FSC: 5305
CAGE: 81348 — FEDERAL SPECIFICATIONS PROMULGATED BY GENERAL SERVICES ADMINISTRATION WASHINGTON DC (USA)
SPECIFICATIONS
materialSTEEL COMP 302 OR STEEL COMP 303 OR STEEL COMP 304 OR STEEL COMP 305 OR STEEL COMP 310 OR STEEL COMP 316 OVERALL
head_styleHEXAGON
head_height0.328 INCHES NOMINAL IN
fastener_length4.500 INCHES NOMINAL IN
surface_treatmentPASSIVATE OVERALL
width_between_flats0.750 INCHES NOMINAL IN
nonmachine_thread_styleGIMLET POINT (TYPE A, AB OR BA)
nondefinitive_spec/std_data3 TYPE AND C GRADE
nonmachine_nominal_thread_diameter0.500 INCHES IN
material_document_and_classification66 FED STD ALL MATERIAL RESPONSES OVERALL
NSN5305-00-407-6543
COMPONENT DIAGRAM
BOLT / SCREW — THREAD VERIFICATION REQUIRED Hex HEAD LENGTH: — THREAD: — × — MATERIAL: — PN: FFB561TYPEVGRADEC · 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
•
NONMACHINE THREAD STYLE: GIMLET POINT (TYPE A, AB OR BA)
•
NONMACHINE NOMINAL THREAD DIAMETER: 0.500 INCHES IN
•
MATERIAL DOCUMENT AND CLASSIFICATION: 66 FED STD ALL MATERIAL RESPONSES OVERALL
•
WIDTH BETWEEN FLATS: 0.750 INCHES NOMINAL IN
•
HEAD HEIGHT: 0.328 INCHES NOMINAL IN
•
HEAD STYLE: HEXAGON
•
FASTENER LENGTH: 4.500 INCHES NOMINAL IN
•
SURFACE TREATMENT: PASSIVATE OVERALL
TECHNICAL CHARACTERISTICS (FLIS)
NONMACHINE THREAD STYLEGIMLET POINT (TYPE A, AB OR BA)
NONMACHINE NOMINAL THREAD DIAMETER0.500 INCHES IN
MATERIAL DOCUMENT AND CLASSIFICATION66 FED STD ALL MATERIAL RESPONSES OVERALL
WIDTH BETWEEN FLATS0.750 INCHES NOMINAL IN
HEAD HEIGHT0.328 INCHES NOMINAL IN
HEAD STYLEHEXAGON
FASTENER LENGTH4.500 INCHES NOMINAL IN
SURFACE TREATMENTPASSIVATE OVERALL
NONDEFINITIVE SPEC/STD DATA3 TYPE AND C GRADE
TEST DATA DOCUMENT81348-STDNO151 DRAWING (THIS IS THE BASIC GOVERNING DRAWING, SUCH AS A CONTRACTOR DRAWING, ORIGINAL EQUIPMENT MANUFACTURER DRAWING, ETC.; EXCLUDES ANY SPECIFICATION, STANDARD OR OTHER DOCUMENT THAT MAY BE REFERENCED IN A BASIC GOVERNING DRAWING)
VERIFIED SUBSTITUTES & CROSS-REFERENCES 18
5371Interchangeable
interchangeable cross-reference
interchangeable
NE9163Interchangeable
interchangeable cross-reference
interchangeable
C2281Interchangeable
interchangeable cross-reference
interchangeable
10688212Interchangeable
interchangeable cross-reference
interchangeable
FFB561Interchangeable
interchangeable cross-reference
interchangeable
MS16992-606Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusACTIVE
AvailabilityOEM and secondary market
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is FFB561TYPEVGRADEC?
FFB561TYPEVGRADEC is a SCREW,LAG.
What parts can replace FFB561TYPEVGRADEC?
There are 18 known substitutes for FFB561TYPEVGRADEC: 5371, NE9163, C2281 and 15 more. Substitute compatibility should be verified for your specific system.
What is the NSN for FFB561TYPEVGRADEC?
FFB561TYPEVGRADEC is cataloged in the Federal Logistics Information System (FLIS) under NSN 5305-00-407-6543. 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