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Technical Data Sheet
PartsTable / COMPONENT / 1/4-20 X 3.50 GRADE 5 YELLOW ZI
1/4-20 X 3.50 GRADE 5 YELLOW ZI ✓ 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 1/4-20 X 3.50 GRADE 5 YELLOW ZI is a the manufacturer industrial component. Key specifications include Drive Bays: 20x 3.5" LFF. This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 5305-01-497-0397, 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
1/4-20 X 3.50 GRADE 5 YELLOW ZI
NSN: 5305-01-497-0397
FSC: 5305
CAGE: 05047 — THE AMERICAN SOCIETY OF MECHANICAL ENGINEERS (USA)
SPECIFICATIONS
Drive Bays20x 3.5" LFF
NSN5305-01-497-0397
COMPONENT DIAGRAM
BOLT / SCREW — THREAD VERIFICATION REQUIRED Hex HEAD LENGTH: — THREAD: — × — MATERIAL: — PN: 1/4-20 X 3.50 GRADE 5 YELLOW ZI · 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 DIRECTION: RIGHT-HAND
•
THREAD LENGTH: 0.750 INCHES NOMINAL IN
•
FASTENER LENGTH: 3.440 INCHES MINIMUM AND 3.500 INCHES MAXIMUM IN
•
HEAD STYLE: HEXAGON
•
THREAD SERIES DESIGNATOR: UNIFIED NATIONAL COARSE (UNC)
•
SURFACE TREATMENT: ZINC OVERALL
•
NOMINAL THREAD DIAMETER: 0.250 INCHES IN
•
THREAD QUANTITY PER INCH: 20
TECHNICAL CHARACTERISTICS (FLIS)
THREAD DIRECTIONRIGHT-HAND
THREAD LENGTH0.750 INCHES NOMINAL IN
FASTENER LENGTH3.440 INCHES MINIMUM AND 3.500 INCHES MAXIMUM IN
HEAD STYLEHEXAGON
THREAD SERIES DESIGNATORUNIFIED NATIONAL COARSE (UNC)
SURFACE TREATMENTZINC OVERALL
NOMINAL THREAD DIAMETER0.250 INCHES IN
THREAD QUANTITY PER INCH20
THREAD CLASS2A A
HEAD HEIGHT0.150 INCHES MINIMUM AND 0.163 INCHES MAXIMUM IN
VERIFIED SUBSTITUTES & CROSS-REFERENCES 6
95017Interchangeable
interchangeable cross-reference
interchangeable
40017Interchangeable
interchangeable cross-reference
interchangeable
SAW-12411637Interchangeable
interchangeable cross-reference
interchangeable
ASME B18.2.1Interchangeable
Same NIIN cross-reference
interchangeable
52843AXInterchangeable
Same NIIN cross-reference
interchangeable
12759-00233Interchangeable
Same NIIN cross-reference
interchangeable
LIFECYCLE
StatusCANCELLED
Availability—
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is 1/4-20 X 3.50 GRADE 5 YELLOW ZI?
1/4-20 X 3.50 GRADE 5 YELLOW ZI is a 1/4-20 X 3.50 GRADE 5 YELLOW ZI.
What parts can replace 1/4-20 X 3.50 GRADE 5 YELLOW ZI?
There are 6 known substitutes for 1/4-20 X 3.50 GRADE 5 YELLOW ZI: 95017, 40017, SAW-12411637 and 3 more. Substitute compatibility should be verified for your specific system.
Is 1/4-20 X 3.50 GRADE 5 YELLOW ZI still available?
1/4-20 X 3.50 GRADE 5 YELLOW ZI 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