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PartsTable / COMPONENT / 1/4-28X3/8UNF SS 18-8
1/4-28X3/8UNF SS 18-8 ✓ 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 1/4-28X3/8UNF SS 18-8 is a the manufacturer industrial component. This product is currently in active production with full OEM support. This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 5305-01-485-8822, 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
1/4-28X3/8UNF SS 18-8
NSN: 5305-01-485-8822
FSC: 5305
CAGE: 6F724 — TACOMA SCREW PRODUCTS, INC. DBA TACOMA SCREW PRODUCTS INC (USA)
SPECIFICATIONS
Part Number1/4-28X3/8UNF SS 18-8
NSN5305-01-485-8822
COMPONENT DIAGRAM
BOLT / SCREW — THREAD VERIFICATION REQUIRED Hex HEAD LENGTH: — THREAD: — × — MATERIAL: — PN: 1/4-28X3/8UNF SS 18-8 · 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
•
NOMINAL THREAD DIAMETER: 0.250 INCHES IN
•
THREAD SERIES DESIGNATOR: UNF
•
THREAD QUANTITY PER INCH: 28
•
WIDTH ACROSS FLATS: 0.156 INCHES NOMINAL IN
•
FASTENER LENGTH: 0.375 INCHES NOMINAL IN
•
INTERNAL DRIVE STYLE: HEXAGON
•
MATERIAL: STEEL COMP 302 OVERALL
TECHNICAL CHARACTERISTICS (FLIS)
NOMINAL THREAD DIAMETER0.250 INCHES IN
THREAD SERIES DESIGNATORUNF
THREAD QUANTITY PER INCH28
WIDTH ACROSS FLATS0.156 INCHES NOMINAL IN
FASTENER LENGTH0.375 INCHES NOMINAL IN
END ITEM IDENTIFICATIONSIMA ACTUATOR
INTERNAL DRIVE STYLEHEXAGON
MATERIALSTEEL COMP 302 OVERALL
VERIFIED SUBSTITUTES & CROSS-REFERENCES 5
73766Interchangeable
interchangeable cross-reference
interchangeable
NL2111-1Interchangeable
interchangeable cross-reference
interchangeable
73405Interchangeable
interchangeable cross-reference
interchangeable
4806-036Interchangeable
Same NIIN cross-reference
interchangeable
1254022Interchangeable
Same NIIN cross-reference
interchangeable
LIFECYCLE
StatusACTIVE
AvailabilityOEM and secondary market
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is 1/4-28X3/8UNF SS 18-8?
1/4-28X3/8UNF SS 18-8 is a 1/4-28X3/8UNF SS 18-8.
What parts can replace 1/4-28X3/8UNF SS 18-8?
There are 5 known substitutes for 1/4-28X3/8UNF SS 18-8: 73766, NL2111-1, 73405 and 2 more. Substitute compatibility should be verified for your specific system.
What is the NSN for 1/4-28X3/8UNF SS 18-8?
1/4-28X3/8UNF SS 18-8 is cataloged in the Federal Logistics Information System (FLIS) under NSN 5305-01-485-8822. 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