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Technical Data Sheet
PartsTable / COMPONENT / 6-40UNF3X5-16
6-40UNF3X5-16 ✓ 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 COMP 303 OVERALL, head_style: FLAT CHAMFER, head_height: 0.133 INCHES MINIMUM AND 0.138 INCHES MAXIMUM IN, thread_class: 3A A, head_diameter: 0.212 INCHES MINIMUM AND 0.217 INCHES MAXIMUM IN, thread_length: 0.312 INCHES MAXIMUM IN. This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 5305-00-286-2083, 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
6-40UNF3X5-16
NSN: 5305-00-286-2083
FSC: 5305
CAGE: 97852 — STAR STAINLESS SCREW CO (USA)
SPECIFICATIONS
materialSTEEL COMP 303 OVERALL
head_styleFLAT CHAMFER
head_height0.133 INCHES MINIMUM AND 0.138 INCHES MAXIMUM IN
thread_class3A A
head_diameter0.212 INCHES MINIMUM AND 0.217 INCHES MAXIMUM IN
thread_length0.312 INCHES MAXIMUM IN
fastener_length0.312 INCHES NOMINAL IN
thread_directionRIGHT-HAND
surface_treatmentPASSIVATE OVERALL
width_across_flats0.094 INCHES NOMINAL IN
internal_drive_styleHEXAGON
nominal_thread_diameter0.138 INCHES IN
NSN5305-00-286-2083
COMPONENT DIAGRAM
BOLT / SCREW — THREAD VERIFICATION REQUIRED Hex HEAD LENGTH: — THREAD: — × — MATERIAL: — PN: 6-40UNF3X5-16 · 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 QUANTITY PER INCH: 40
•
SURFACE TREATMENT: PASSIVATE OVERALL
•
THREAD SERIES DESIGNATOR: UNF
•
FASTENER LENGTH: 0.312 INCHES NOMINAL IN
•
INTERNAL DRIVE STYLE: HEXAGON
•
HEAD HEIGHT: 0.133 INCHES MINIMUM AND 0.138 INCHES MAXIMUM IN
•
THREAD CLASS: 3A A
•
HEAD STYLE: FLAT CHAMFER
TECHNICAL CHARACTERISTICS (FLIS)
THREAD QUANTITY PER INCH40
SURFACE TREATMENTPASSIVATE OVERALL
THREAD SERIES DESIGNATORUNF
FASTENER LENGTH0.312 INCHES NOMINAL IN
INTERNAL DRIVE STYLEHEXAGON
HEAD HEIGHT0.133 INCHES MINIMUM AND 0.138 INCHES MAXIMUM IN
THREAD CLASS3A A
HEAD STYLEFLAT CHAMFER
WIDTH ACROSS FLATS0.094 INCHES NOMINAL IN
MATERIAL DOCUMENT AND CLASSIFICATIONQQ-S-763 FED SPEC SINGLE MATERIAL RESPONSE OVERALL
VERIFIED SUBSTITUTES & CROSS-REFERENCES 20
22618Interchangeable
interchangeable cross-reference
interchangeable
N22618Interchangeable
interchangeable cross-reference
interchangeable
17390N PIECE 11Interchangeable
interchangeable cross-reference
interchangeable
1311Interchangeable
interchangeable cross-reference
interchangeable
1311SAInterchangeable
interchangeable cross-reference
interchangeable
AA59598Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusCANCELLED
Availability—
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is 6-40UNF3X5-16?
6-40UNF3X5-16 is a SCREW,CAP,SOCKET HEAD.
What parts can replace 6-40UNF3X5-16?
There are 20 known substitutes for 6-40UNF3X5-16: 22618, N22618, 17390N PIECE 11 and 17 more. Substitute compatibility should be verified for your specific system.
Is 6-40UNF3X5-16 still available?
6-40UNF3X5-16 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