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Technical Data Sheet
PartsTable / COMPONENT / 4-40NCX3-8SKTFLHDCRES
4-40NCX3-8SKTFLHDCRES ✓ 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 CORROSION RESISTING OVERALL, head_style: FLAT COUNTERSUNK, thread_class: 3A A, head_diameter: 0.218 INCHES MINIMUM AND 0.255 INCHES MAXIMUM IN, thread_length: 0.375 INCHES NOMINAL IN, fastener_length: 0.375 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 5305-01-199-1331, 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
4-40NCX3-8SKTFLHDCRES
NSN: 5305-01-199-1331
FSC: 5305
CAGE: 70276 — ALLEN MFG CO SUB OF CHICAGO PNEUMATIC TOOL CO (USA)
SPECIFICATIONS
materialSTEEL CORROSION RESISTING OVERALL
head_styleFLAT COUNTERSUNK
thread_class3A A
head_diameter0.218 INCHES MINIMUM AND 0.255 INCHES MAXIMUM IN
thread_length0.375 INCHES NOMINAL IN
fastener_length0.375 INCHES NOMINAL IN
thread_directionRIGHT-HAND
countersink_angle80.0 DEGREES MINIMUM AND 84.0 DEGREES MAXIMUM
width_across_flats0.062 INCHES NOMINAL IN
internal_drive_styleHEXAGON
nominal_thread_diameter0.112 INCHES IN
thread_quantity_per_inch40
NSN5305-01-199-1331
COMPONENT DIAGRAM
BOLT / SCREW — THREAD VERIFICATION REQUIRED Hex HEAD LENGTH: — THREAD: — × — MATERIAL: — PN: 4-40NCX3-8SKTFLHDCRES · 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: 0.375 INCHES NOMINAL IN
•
INTERNAL DRIVE STYLE: HEXAGON
•
NOMINAL THREAD DIAMETER: 0.112 INCHES IN
•
THREAD LENGTH: 0.375 INCHES NOMINAL IN
•
COUNTERSINK ANGLE: 80.0 DEGREES MINIMUM AND 84.0 DEGREES MAXIMUM
•
MATERIAL: STEEL CORROSION RESISTING OVERALL
•
THREAD CLASS: 3A A
•
WIDTH ACROSS FLATS: 0.062 INCHES NOMINAL IN
TECHNICAL CHARACTERISTICS (FLIS)
FASTENER LENGTH0.375 INCHES NOMINAL IN
INTERNAL DRIVE STYLEHEXAGON
NOMINAL THREAD DIAMETER0.112 INCHES IN
THREAD LENGTH0.375 INCHES NOMINAL IN
COUNTERSINK ANGLE80.0 DEGREES MINIMUM AND 84.0 DEGREES MAXIMUM
MATERIALSTEEL CORROSION RESISTING OVERALL
THREAD CLASS3A A
WIDTH ACROSS FLATS0.062 INCHES NOMINAL IN
HEAD DIAMETER0.218 INCHES MINIMUM AND 0.255 INCHES MAXIMUM IN
HEAD STYLEFLAT COUNTERSUNK
VERIFIED SUBSTITUTES & CROSS-REFERENCES 5
MS51068-40Interchangeable
interchangeable cross-reference
interchangeable
44210Interchangeable
interchangeable cross-reference
interchangeable
MIL-DTL-11040Interchangeable
interchangeable cross-reference
interchangeable
732185-1Interchangeable
interchangeable cross-reference
interchangeable
12488879Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusACTIVE
AvailabilityOEM and secondary market
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is 4-40NCX3-8SKTFLHDCRES?
4-40NCX3-8SKTFLHDCRES is a SCREW,CAP,SOCKET HEAD.
What parts can replace 4-40NCX3-8SKTFLHDCRES?
There are 5 known substitutes for 4-40NCX3-8SKTFLHDCRES: MS51068-40, 44210, MIL-DTL-11040 and 2 more. Substitute compatibility should be verified for your specific system.
What is the NSN for 4-40NCX3-8SKTFLHDCRES?
4-40NCX3-8SKTFLHDCRES is cataloged in the Federal Logistics Information System (FLIS) under NSN 5305-01-199-1331. 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