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PartsTable / COMPONENT / 91772A551
91772A551 ✓ 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,MACHINE is a the manufacturer industrial component. Key specifications include head_height: 0.162 INCHES MINIMUM AND 0.175 INCHES MAXIMUM IN, thread_class: 2A A, head_diameter: 0.473 INCHES MINIMUM AND 0.492 INCHES MAXIMUM IN, screw_material: STEEL CORROSION RESISTING, fastener_length: 2.25 INCHES NOMINAL IN, internal_drive_style: TORQUE-SET RIBBED. This product is currently in active production with full OEM support.

This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 5305-01-672-1384, 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
91772A551
NSN: 5305-01-672-1384
FSC: 5305
CAGE: 39428 — MCMASTER-CARR SUPPLY CO (USA)
SPECIFICATIONS
head_height0.162 INCHES MINIMUM AND 0.175 INCHES MAXIMUM IN
thread_class2A A
head_diameter0.473 INCHES MINIMUM AND 0.492 INCHES MAXIMUM IN
screw_materialSTEEL CORROSION RESISTING
fastener_length2.25 INCHES NOMINAL IN
internal_drive_styleTORQUE-SET RIBBED
end_item_identificationMRAP - M-ATV UI W/OGPK
thread_series_designatorUNIFIED NATIONAL COARSE (UNC)
part_name_assigned_by_controlling_agencySCR,PAN HEAD CROSS-RECESSED
NSN5305-01-672-1384
COMPONENT DIAGRAM
BOLT / SCREW — THREAD VERIFICATION REQUIRED Hex HEAD LENGTH: — THREAD: — × — MATERIAL: — PN: 91772A551 · 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: 2.25 INCHES NOMINAL IN
•
HEAD DIAMETER: 0.473 INCHES MINIMUM AND 0.492 INCHES MAXIMUM IN
•
HEAD HEIGHT: 0.162 INCHES MINIMUM AND 0.175 INCHES MAXIMUM IN
•
THREAD CLASS: 2A A
•
THREAD SERIES DESIGNATOR: UNIFIED NATIONAL COARSE (UNC)
•
INTERNAL DRIVE STYLE: TORQUE-SET RIBBED
TECHNICAL CHARACTERISTICS (FLIS)
FASTENER LENGTH2.25 INCHES NOMINAL IN
HEAD DIAMETER0.473 INCHES MINIMUM AND 0.492 INCHES MAXIMUM IN
HEAD HEIGHT0.162 INCHES MINIMUM AND 0.175 INCHES MAXIMUM IN
END ITEM IDENTIFICATIONMRAP - M-ATV UI W/OGPK
THREAD CLASS2A A
PART NAME ASSIGNED BY CONTROLLING AGENCYSCR,PAN HEAD CROSS-RECESSED
THREAD SERIES DESIGNATORUNIFIED NATIONAL COARSE (UNC)
INTERNAL DRIVE STYLETORQUE-SET RIBBED
SCREW MATERIALSTEEL CORROSION RESISTING
VERIFIED SUBSTITUTES & CROSS-REFERENCES 3
253418Interchangeable
interchangeable cross-reference
interchangeable
3253418Interchangeable
interchangeable cross-reference
interchangeable
81158S4105-1010247Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusACTIVE
AvailabilityOEM and secondary market
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is 91772A551?
91772A551 is a SCREW,MACHINE.
What parts can replace 91772A551?
There are 3 known substitutes for 91772A551: 253418, 3253418, 81158S4105-1010247. Substitute compatibility should be verified for your specific system.
What is the NSN for 91772A551?
91772A551 is cataloged in the Federal Logistics Information System (FLIS) under NSN 5305-01-672-1384. 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