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PartsTable / COMPONENT / 4-40NC3AX1-8
4-40NC3AX1-8 ✓ 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 SETSCREW is a the manufacturer industrial component. Key specifications include material: STEEL OVERALL, head_style: HEADLESS (SETSCREW), point_style: CUP, thread_class: 3A A, thread_length: 0.115 INCHES MINIMUM AND 0.135 INCHES MAXIMUM IN, fastener_length: 0.115 INCHES MINIMUM AND 0.135 INCHES MAXIMUM 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 5305-00-255-4465, 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
4-40NC3AX1-8
NSN: 5305-00-255-4465
FSC: 5305
CAGE: 19451 — PERINE MACHINE TOOL CORP (USA)
SPECIFICATIONS
materialSTEEL OVERALL
head_styleHEADLESS (SETSCREW)
point_styleCUP
thread_class3A A
thread_length0.115 INCHES MINIMUM AND 0.135 INCHES MAXIMUM IN
fastener_length0.115 INCHES MINIMUM AND 0.135 INCHES MAXIMUM IN
thread_directionRIGHT-HAND
width_across_flats0.050 INCHES MINIMUM AND 0.051 INCHES MAXIMUM IN
internal_drive_styleHEXAGON
nominal_thread_diameter0.112 INCHES IN
thread_quantity_per_inch40
thread_series_designatorUNIFIED NATIONAL COARSE (UNC)
NSN5305-00-255-4465
COMPONENT DIAGRAM
BOLT / SCREW — THREAD VERIFICATION REQUIRED Hex HEAD LENGTH: — THREAD: — × — MATERIAL: — PN: 4-40NC3AX1-8 · 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: UNIFIED NATIONAL COARSE (UNC)
•
MATERIAL: STEEL OVERALL
•
WIDTH ACROSS FLATS: 0.050 INCHES MINIMUM AND 0.051 INCHES MAXIMUM IN
•
THREAD CLASS: 3A A
•
THREAD DIRECTION: RIGHT-HAND
•
THREAD LENGTH: 0.115 INCHES MINIMUM AND 0.135 INCHES MAXIMUM IN
•
INTERNAL DRIVE STYLE: HEXAGON
•
POINT STYLE: CUP
TECHNICAL CHARACTERISTICS (FLIS)
THREAD SERIES DESIGNATORUNIFIED NATIONAL COARSE (UNC)
MATERIALSTEEL OVERALL
WIDTH ACROSS FLATS0.050 INCHES MINIMUM AND 0.051 INCHES MAXIMUM IN
THREAD CLASS3A A
THREAD DIRECTIONRIGHT-HAND
THREAD LENGTH0.115 INCHES MINIMUM AND 0.135 INCHES MAXIMUM IN
INTERNAL DRIVE STYLEHEXAGON
POINT STYLECUP
FASTENER LENGTH0.115 INCHES MINIMUM AND 0.135 INCHES MAXIMUM IN
NOMINAL THREAD DIAMETER0.112 INCHES IN
VERIFIED SUBSTITUTES & CROSS-REFERENCES 7
MS21919WDG3Interchangeable
interchangeable cross-reference
interchangeable
5CInterchangeable
interchangeable cross-reference
interchangeable
SAE-AS21919Interchangeable
interchangeable cross-reference
interchangeable
1-15105Interchangeable
interchangeable cross-reference
interchangeable
2056903-1Interchangeable
interchangeable cross-reference
interchangeable
2056903-4Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusACTIVE
AvailabilityOEM and secondary market
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is 4-40NC3AX1-8?
4-40NC3AX1-8 is a SETSCREW.
What parts can replace 4-40NC3AX1-8?
There are 7 known substitutes for 4-40NC3AX1-8: MS21919WDG3, 5C, SAE-AS21919 and 4 more. Substitute compatibility should be verified for your specific system.
What is the NSN for 4-40NC3AX1-8?
4-40NC3AX1-8 is cataloged in the Federal Logistics Information System (FLIS) under NSN 5305-00-255-4465. 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