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FFS91 — SCREW,MACHINE

✓ Government record, cited
— · BOLT SCREW
PRODUCT OVERVIEW

FFS91: SCREW,MACHINE.

The SCREW,MACHINE is a the manufacturer industrial component. Key specifications include material: STEEL OVERALL, nut_style: HEXAGON, head_style: FLAT COUNTERSUNK, nut_height: 0.218 INCHES NOMINAL IN, head_height: 0.106 INCHES MINIMUM AND 0.113 INCHES MAXIMUM IN, thread_class: 2B. This part is cataloged in the U.S.

Government catalog under NSN 5305-00-150-9185, 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
FFS91
NSN: 5305-00-150-9185
NIINs: 001509185, 002065136, 002751706, 005967405
FSC: 5305 — Screws
CAGE: 81348 — FEDERAL SPECIFICATIONS PROMULGATED BY GENERAL SERVICES ADMINISTRATION WASHINGTON DC (USA)
SPECIFICATIONS
materialSTEEL OVERALL
nut_styleHEXAGON
head_styleFLAT COUNTERSUNK
nut_height0.218 INCHES NOMINAL IN
head_height0.106 INCHES MINIMUM AND 0.113 INCHES MAXIMUM IN
thread_class2B
head_diameter0.207 INCHES MINIMUM AND 0.225 INCHES MAXIMUM IN
thread_length0.308 INCHES MAXIMUM IN
thread_seriesUNF
screw_materialCOPPER ALLOY 360
fastener_length0.375 INCHES NOMINAL IN
thread_directionRIGHT-HAND
NSN5305-00-150-9185
COMPONENT DIAGRAM
BOLT / SCREW — THREAD VERIFICATION REQUIRED Hex HEAD LENGTH: — THREAD: — × — MATERIAL: — PN: FFS91 · 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 HEIGHT: 0.106 INCHES MINIMUM AND 0.113 INCHES MAXIMUM IN
•
FASTENER LENGTH: 0.719 INCHES MINIMUM AND 0.750 INCHES MAXIMUM IN
•
THREAD LENGTH: 0.719 INCHES MINIMUM AND 0.750 INCHES MAXIMUM IN
•
NOMINAL THREAD DIAMETER: 0.164 INCHES IN
•
HEAD STYLE: FILLISTER
•
THREAD DIRECTION: RIGHT-HAND
•
SCREW MATERIAL: COPPER ALLOY
•
MINIMUM TENSILE STRENGTH: 55000 POUNDS PER SQUARE INCH LBS
TECHNICAL CHARACTERISTICS
HEAD HEIGHT0.106 INCHES MINIMUM AND 0.113 INCHES MAXIMUM IN
FASTENER LENGTH0.719 INCHES MINIMUM AND 0.750 INCHES MAXIMUM IN
THREAD LENGTH0.719 INCHES MINIMUM AND 0.750 INCHES MAXIMUM IN
NOMINAL THREAD DIAMETER0.164 INCHES IN
HEAD STYLEFILLISTER
THREAD DIRECTIONRIGHT-HAND
SCREW MATERIALCOPPER ALLOY
MINIMUM TENSILE STRENGTH55000 POUNDS PER SQUARE INCH LBS
INTERNAL DRIVE STYLESLOT
THREAD CLASS2A A
SUBSTITUTES & CROSS-REFERENCES 1
AN500B8-12Same NSN cross-reference
Same NSN cross-reference
Also cataloged under this NSN
LIFECYCLE
NSN statusActive· U.S. Government catalog
No demilitarization required
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FREQUENTLY ASKED QUESTIONS
What is FFS91?
FFS91 is a SCREW,MACHINE.
What parts can replace FFS91?
There is 1 known substitute for FFS91: AN500B8-12. Substitute compatibility should be verified for your specific system.
What is the NSN for FFS91?
FFS91 is cataloged in the U.S. Government catalog under NSN 5305-00-150-9185. This indicates validated use in U.S. government and defense supply chains.
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✓ PartsTable — the parts reference. Every fact cited to its source.
PartsTable Design LLC · partstable.com
U.S. Government catalog: edition PUBLOGDVD v12.0.0 (OCT 2026), edition date 2026-10-01, retrieved 2026-10-18.
PartsTable commercial catalog: edition Unified commercial catalog snapshot through 2026-09-28, edition date not on file, retrieved 2026-09-28.