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91263A564 — SCREW,CAP,SOCKET HEAD

✓ Government record, cited
— · BOLT SCREW
PRODUCT OVERVIEW

91263A564: SCREW,CAP,SOCKET HEAD.

The SCREW,CAP,SOCKET HEAD is a the manufacturer industrial component. Key specifications include material: STEEL OVERALL, head_style: FLAT COUNTERSUNK UNDERCUT, head_height: 0.161 INCHES NOMINAL IN, thread_class: 3A A, head_diameter: 0.531 INCHES NOMINAL IN, thread_length: 1.339 INCHES NOMINAL IN. This part is cataloged in the U.S.

Government catalog under NSN 5305-01-641-6958, 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
91263A564
NSN: 5305-01-641-6958
FSC: 5305 — Screws
CAGE: 39428 — MCMASTER-CARR SUPPLY CO (USA)
SPECIFICATIONS
materialSTEEL OVERALL
head_styleFLAT COUNTERSUNK UNDERCUT
head_height0.161 INCHES NOMINAL IN
thread_class3A A
head_diameter0.531 INCHES NOMINAL IN
thread_length1.339 INCHES NOMINAL IN
fastener_length1.50 INCHES NOMINAL IN
special_featuresMATERIAL ALLOY STEEL
thread_directionRIGHT-HAND
countersink_angle82.0 DEGREES NOMINAL
surface_treatmentZINC OVERALL
width_across_flats0.1562 INCHES NOMINAL IN
NSN5305-01-641-6958
COMPONENT DIAGRAM
BOLT / SCREW — THREAD VERIFICATION REQUIRED Hex HEAD LENGTH: — THREAD: — × — MATERIAL: — PN: 91263A564 · 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: 0.1562 INCHES NOMINAL IN
•
HEAD HEIGHT: 0.161 INCHES NOMINAL IN
•
FASTENER LENGTH: 1.50 INCHES NOMINAL IN
•
THREAD LENGTH: 1.339 INCHES NOMINAL IN
•
NOMINAL THREAD DIAMETER: 0.250 INCHES IN
•
HEAD STYLE: FLAT COUNTERSUNK UNDERCUT
•
THREAD DIRECTION: RIGHT-HAND
TECHNICAL CHARACTERISTICS
WIDTH ACROSS FLATS0.1562 INCHES NOMINAL IN
HEAD HEIGHT0.161 INCHES NOMINAL IN
FASTENER LENGTH1.50 INCHES NOMINAL IN
THREAD LENGTH1.339 INCHES NOMINAL IN
NOMINAL THREAD DIAMETER0.250 INCHES IN
HEAD STYLEFLAT COUNTERSUNK UNDERCUT
THREAD DIRECTIONRIGHT-HAND
SPECIAL FEATURESMATERIAL ALLOY STEEL
SURFACE TREATMENTZINC OVERALL
MINIMUM TENSILE STRENGTH120000 POUNDS PER SQUARE INCH LBS
OTHER ITEMS IN FSC 5305 — Screws
Items in the same Federal Supply class. No interchangeability or substitution relationship is implied.
5305-00-001-5016 5305-00-001-9160 5305-00-001-9629 5305-00-001-9742 5305-00-001-9768 5305-00-003-4306 5305-00-003-6694 5305-00-003-6753
SUBSTITUTES & CROSS-REFERENCES

No substitute or cross-reference records for this part.

LIFECYCLE
NSN statusActive· U.S. Government catalog
Acquisition advice: Normally procured from the manufacturer (OEM)No demilitarization required
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FREQUENTLY ASKED QUESTIONS
What is 91263A564?
91263A564 is a SCREW,CAP,SOCKET HEAD.
What is the NSN for 91263A564?
91263A564 is cataloged in the U.S. Government catalog under NSN 5305-01-641-6958. 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.