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PartsTable / COMPONENT / 91251A718
91251A718 ✓ 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: STEEL OVERALL, head_style: FLAT FILLISTER, head_height: 0.50 INCHES NOMINAL IN, thread_class: 2A A, head_diameter: 0.75 INCHES NOMINAL IN, thread_length: 1.75 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 5305-01-620-4798, 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
91251A718
NSN: 5305-01-620-4798
FSC: 5305
CAGE: 39428 — MCMASTER-CARR SUPPLY CO (USA)
SPECIFICATIONS
materialSTEEL OVERALL
head_styleFLAT FILLISTER
head_height0.50 INCHES NOMINAL IN
thread_class2A A
head_diameter0.75 INCHES NOMINAL IN
thread_length1.75 INCHES NOMINAL IN
fastener_length1.75 INCHES NOMINAL IN
thread_directionRIGHT-HAND
width_across_flats0.375 INCHES NOMINAL IN
internal_drive_styleHEXAGON
nominal_thread_diameter0.50 INCHES IN
thread_quantity_per_inch13
NSN5305-01-620-4798
COMPONENT DIAGRAM
BOLT / SCREW — THREAD VERIFICATION REQUIRED Hex HEAD LENGTH: — THREAD: — × — MATERIAL: — PN: 91251A718 · 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
•
FASTENER LENGTH: 1.75 INCHES NOMINAL IN
•
THREAD QUANTITY PER INCH: 13
•
THREAD LENGTH: 1.75 INCHES NOMINAL IN
•
NOMINAL THREAD DIAMETER: 0.50 INCHES IN
•
HEAD HEIGHT: 0.50 INCHES NOMINAL IN
•
HEAD DIAMETER: 0.75 INCHES NOMINAL IN
•
THREAD DIRECTION: RIGHT-HAND
•
THREAD CLASS: 2A A
TECHNICAL CHARACTERISTICS (FLIS)
FASTENER LENGTH1.75 INCHES NOMINAL IN
THREAD QUANTITY PER INCH13
THREAD LENGTH1.75 INCHES NOMINAL IN
NOMINAL THREAD DIAMETER0.50 INCHES IN
HEAD HEIGHT0.50 INCHES NOMINAL IN
HEAD DIAMETER0.75 INCHES NOMINAL IN
THREAD DIRECTIONRIGHT-HAND
THREAD CLASS2A A
WIDTH ACROSS FLATS0.375 INCHES NOMINAL IN
INTERNAL DRIVE STYLEHEXAGON
VERIFIED SUBSTITUTES & CROSS-REFERENCES 17
889646PT5Interchangeable
interchangeable cross-reference
interchangeable
10534Interchangeable
interchangeable cross-reference
interchangeable
64137Interchangeable
interchangeable cross-reference
interchangeable
49744Interchangeable
interchangeable cross-reference
interchangeable
C08868Interchangeable
interchangeable cross-reference
interchangeable
51044Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusACTIVE
AvailabilityOEM and secondary market
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is 91251A718?
91251A718 is a SCREW,CAP,SOCKET HEAD.
What parts can replace 91251A718?
There are 17 known substitutes for 91251A718: 889646PT5, 10534, 64137 and 14 more. Substitute compatibility should be verified for your specific system.
What is the NSN for 91251A718?
91251A718 is cataloged in the Federal Logistics Information System (FLIS) under NSN 5305-01-620-4798. 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