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PartsTable / COMPONENT / FF-S-86 TYPE IV
FF-S-86 TYPE IV ✓ 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,CAP,SOCKET HEAD is a the manufacturer industrial component. Key specifications include material: COPPER ALLOY OVERALL, head_style: FLAT COUNTERSUNK, head_height: 0.185 INCHES MINIMUM AND 0.190 INCHES MAXIMUM IN, thread_class: 2A A, head_diameter: 1.251 INCHES MINIMUM AND 1.375 INCHES MAXIMUM IN, thread_length: 2.050 INCHES NOMINAL IN. This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 5305-00-849-2853, 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-S-86 TYPE IV
NSN: 5305-00-849-2853
FSC: 5305
CAGE: 81348 — FEDERAL SPECIFICATIONS PROMULGATED BY GENERAL SERVICES ADMINISTRATION WASHINGTON DC (USA)
SPECIFICATIONS
materialCOPPER ALLOY OVERALL
head_styleFLAT COUNTERSUNK
head_height0.185 INCHES MINIMUM AND 0.190 INCHES MAXIMUM IN
thread_class2A A
head_diameter1.251 INCHES MINIMUM AND 1.375 INCHES MAXIMUM IN
thread_length2.050 INCHES NOMINAL IN
surface_finish125.0 MICROINCHES OVERALL
fastener_length0.500 INCHES NOMINAL IN
hardness_rating80.0 ROCKWELL B MINIMUM OVERALL
thread_directionRIGHT-HAND
countersink_angle82.0 DEGREES NOMINAL
surface_treatmentPASSIVATE OVERALL
NSN5305-00-849-2853
COMPONENT DIAGRAM
BOLT / SCREW — THREAD VERIFICATION REQUIRED Hex HEAD LENGTH: — THREAD: — × — MATERIAL: — PN: FF-S-86 TYPE IV · 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
•
WIDTH ACROSS FLATS: 0.312 INCHES MINIMUM AND 0.316 INCHES MAXIMUM IN
•
THREAD QUANTITY PER INCH: 13
•
HEAD DIAMETER: 0.872 INCHES MINIMUM AND 0.937 INCHES MAXIMUM IN
•
HEAD STYLE: FLAT COUNTERSUNK
•
COUNTERSINK ANGLE: 82.0 DEGREES NOMINAL
•
SURFACE FINISH: 125.0 MICROINCHES OVERALL
•
MATERIAL: STEEL COMP 302 OR STEEL COMP 304 OR STEEL COMP 305 OR STEEL COMP 316 OR STEEL COMP 384 OR STEEL COMP XM-7 OVERALL
•
HARDNESS RATING: 80.0 ROCKWELL B MINIMUM OVERALL
TECHNICAL CHARACTERISTICS (FLIS)
WIDTH ACROSS FLATS0.312 INCHES MINIMUM AND 0.316 INCHES MAXIMUM IN
THREAD QUANTITY PER INCH13
HEAD DIAMETER0.872 INCHES MINIMUM AND 0.937 INCHES MAXIMUM IN
HEAD STYLEFLAT COUNTERSUNK
COUNTERSINK ANGLE82.0 DEGREES NOMINAL
SURFACE FINISH125.0 MICROINCHES OVERALL
MATERIALSTEEL COMP 302 OR STEEL COMP 304 OR STEEL COMP 305 OR STEEL COMP 316 OR STEEL COMP 384 OR STEEL COMP XM-7 OVERALL
HARDNESS RATING80.0 ROCKWELL B MINIMUM OVERALL
MINIMUM YIELD STRENGTH30000 POUNDS PER SQUARE INCH LBS
THREAD SERIES DESIGNATORUNIFIED NATIONAL COARSE (UNC)
VERIFIED SUBSTITUTES & CROSS-REFERENCES 14
51480Interchangeable
interchangeable cross-reference
interchangeable
FF-S-86 TYPE IVInterchangeable
interchangeable cross-reference
interchangeable
100A905078Interchangeable
interchangeable cross-reference
interchangeable
92197A244Interchangeable
interchangeable cross-reference
interchangeable
0.750-10UNC-3A2.250 LGInterchangeable
interchangeable cross-reference
interchangeable
845-4558721 ITEM 10Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusCANCELLED
Availability—
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is FF-S-86 TYPE IV?
FF-S-86 TYPE IV is a SCREW,CAP,SOCKET HEAD.
What parts can replace FF-S-86 TYPE IV?
There are 14 known substitutes for FF-S-86 TYPE IV: 51480, FF-S-86 TYPE IV, 100A905078 and 11 more. Substitute compatibility should be verified for your specific system.
Is FF-S-86 TYPE IV still available?
FF-S-86 TYPE IV 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