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PartsTable / COMPONENT / 181643
181643 ✓ 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,HEXAGON HEAD is a the manufacturer industrial component. Key specifications include head_style: HEXAGON, thread_length: 1.500 INCHES NOMINAL IN, thread_direction: RIGHT-HAND, nominal_thread_diameter: 0.375 INCHES IN, thread_series_designator: UNF. This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 5305-00-576-6987, 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
181643
NSN: 5305-00-576-6987
FSC: 5305
CAGE: 24617 — GENERAL MOTORS CORP (USA)
SPECIFICATIONS
head_styleHEXAGON
thread_length1.500 INCHES NOMINAL IN
thread_directionRIGHT-HAND
nominal_thread_diameter0.375 INCHES IN
thread_series_designatorUNF
NSN5305-00-576-6987
COMPONENT DIAGRAM
BOLT / SCREW — THREAD VERIFICATION REQUIRED Hex HEAD LENGTH: — THREAD: — × — MATERIAL: — PN: 181643 · 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
•
NOMINAL THREAD DIAMETER: 0.375 INCHES IN
•
MATERIAL: STEEL OVERALL
•
MINIMUM YIELD STRENGTH: 120000 POUNDS PER SQUARE INCH LBS
•
THREAD SERIES DESIGNATOR: UNF
•
HEAD STYLE: HEXAGON
•
HARDNESS RATING: 23.0 ROCKWELL C MINIMUM AND 30.0 ROCKWELL C MAXIMUM OVERALL
•
THREAD CLASS: 2A A
•
WIDTH BETWEEN FLATS: 0.551 INCHES MINIMUM AND 0.562 INCHES MAXIMUM IN
TECHNICAL CHARACTERISTICS (FLIS)
NOMINAL THREAD DIAMETER0.375 INCHES IN
MATERIALSTEEL OVERALL
MINIMUM YIELD STRENGTH120000 POUNDS PER SQUARE INCH LBS
THREAD SERIES DESIGNATORUNF
HEAD STYLEHEXAGON
HARDNESS RATING23.0 ROCKWELL C MINIMUM AND 30.0 ROCKWELL C MAXIMUM OVERALL
THREAD CLASS2A A
WIDTH BETWEEN FLATS0.551 INCHES MINIMUM AND 0.562 INCHES MAXIMUM IN
THREAD QUANTITY PER INCH24
THREAD LENGTH1.000 INCHES NOMINAL IN
VERIFIED SUBSTITUTES & CROSS-REFERENCES 12
S125Interchangeable
interchangeable cross-reference
interchangeable
S12603-119Interchangeable
interchangeable cross-reference
interchangeable
TF403-119Interchangeable
interchangeable cross-reference
interchangeable
S125-2Interchangeable
interchangeable cross-reference
interchangeable
6723-00310Interchangeable
interchangeable cross-reference
interchangeable
6723-00386Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusCANCELLED
Availability—
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is 181643?
181643 is a SCREW,CAP,HEXAGON HEAD.
What parts can replace 181643?
There are 12 known substitutes for 181643: S125, S12603-119, TF403-119 and 9 more. Substitute compatibility should be verified for your specific system.
Is 181643 still available?
181643 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