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Technical Data Sheet
PartsTable / COMPONENT / 337ZI
337ZI ✓ 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,SPECIAL 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 5305-01-275-3133, 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
337ZI
NSN: 5305-01-275-3133
FSC: 5305
CAGE: 51963 — WINDOW COMPONENTS MFG INC (USA)
SPECIFICATIONS
Part Number337ZI
NSN5305-01-275-3133
COMPONENT DIAGRAM
BOLT / SCREW — THREAD VERIFICATION REQUIRED Hex HEAD LENGTH: — THREAD: — × — MATERIAL: — PN: 337ZI · 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
VERIFIED SUBSTITUTES & CROSS-REFERENCES 7
WC73544Interchangeable
interchangeable cross-reference
interchangeable
3721Interchangeable
interchangeable cross-reference
interchangeable
F73544Interchangeable
interchangeable cross-reference
interchangeable
CH33721Interchangeable
interchangeable cross-reference
interchangeable
33721Interchangeable
interchangeable cross-reference
interchangeable
337CInterchangeable
Same NIIN cross-reference
interchangeable
LIFECYCLE
StatusACTIVE
AvailabilityOEM and secondary market
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is 337ZI?
337ZI is a SCREW,SPECIAL.
What parts can replace 337ZI?
There are 7 known substitutes for 337ZI: WC73544, 3721, F73544 and 4 more. Substitute compatibility should be verified for your specific system.
What is the NSN for 337ZI?
337ZI is cataloged in the Federal Logistics Information System (FLIS) under NSN 5305-01-275-3133. 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