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PartsTable / COMPONENT / 5550509
5550509 ✓ 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_style: ROUND, fastener_length: 0.750 INCHES NOMINAL IN, nominal_thread_diameter: 0.190 INCHES IN, thread_quantity_per_inch: 32, thread_series_designator: UNF. This product is currently in active production with full OEM support.

This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 5305-01-155-9770, 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
5550509
NSN: 5305-01-155-9770
FSC: 5305
CAGE: 34623 — AM GENERAL LLC (USA)
SPECIFICATIONS
head_styleROUND
fastener_length0.750 INCHES NOMINAL IN
nominal_thread_diameter0.190 INCHES IN
thread_quantity_per_inch32
thread_series_designatorUNF
NSN5305-01-155-9770
COMPONENT DIAGRAM
BOLT / SCREW — THREAD VERIFICATION REQUIRED Hex HEAD LENGTH: — THREAD: — × — MATERIAL: — PN: 5550509 · 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
•
THREAD SERIES DESIGNATOR: UNF
•
FASTENER LENGTH: 0.750 INCHES NOMINAL IN
•
HEAD STYLE: ROUND
•
THREAD QUANTITY PER INCH: 32
•
NOMINAL THREAD DIAMETER: 0.190 INCHES IN
TECHNICAL CHARACTERISTICS (FLIS)
THREAD SERIES DESIGNATORUNF
FASTENER LENGTH0.750 INCHES NOMINAL IN
HEAD STYLEROUND
THREAD QUANTITY PER INCH32
NOMINAL THREAD DIAMETER0.190 INCHES IN
VERIFIED SUBSTITUTES & CROSS-REFERENCES 11
MILS3951Interchangeable
interchangeable cross-reference
interchangeable
4-4-91Interchangeable
interchangeable cross-reference
interchangeable
N13390PC4491Interchangeable
interchangeable cross-reference
interchangeable
76L75Interchangeable
interchangeable cross-reference
interchangeable
M3323Interchangeable
interchangeable cross-reference
interchangeable
4483Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusACTIVE
AvailabilityOEM and secondary market
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is 5550509?
5550509 is a SCREW,MACHINE.
What parts can replace 5550509?
There are 11 known substitutes for 5550509: MILS3951, 4-4-91, N13390PC4491 and 8 more. Substitute compatibility should be verified for your specific system.
What is the NSN for 5550509?
5550509 is cataloged in the Federal Logistics Information System (FLIS) under NSN 5305-01-155-9770. 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