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PartsTable / COMPONENT / DD421S55-280ALT1PC14
DD421S55-280ALT1PC14 ✓ 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,STEP 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 5305-00-334-9046, 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
DD421S55-280ALT1PC14
NSN: 5305-00-334-9046
FSC: 5305
CAGE: 80064 — NAVAL SHIP SYSTEMS COMMAND (USA)
SPECIFICATIONS
Part NumberDD421S55-280ALT1PC14
NSN5305-00-334-9046
COMPONENT DIAGRAM
BOLT / SCREW — THREAD VERIFICATION REQUIRED Hex HEAD LENGTH: — THREAD: — × — MATERIAL: — PN: DD421S55-280ALT1PC14 · 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 26
15005Interchangeable
interchangeable cross-reference
interchangeable
SU970Interchangeable
interchangeable cross-reference
interchangeable
639361-108Interchangeable
interchangeable cross-reference
interchangeable
LYC505-05Interchangeable
interchangeable cross-reference
interchangeable
509964-1Interchangeable
interchangeable cross-reference
interchangeable
8-74-21-25-016Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusACTIVE
AvailabilityOEM and secondary market
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is DD421S55-280ALT1PC14?
DD421S55-280ALT1PC14 is a SCREW,STEP.
What parts can replace DD421S55-280ALT1PC14?
There are 26 known substitutes for DD421S55-280ALT1PC14: 15005, SU970, 639361-108 and 23 more. Substitute compatibility should be verified for your specific system.
What is the NSN for DD421S55-280ALT1PC14?
DD421S55-280ALT1PC14 is cataloged in the Federal Logistics Information System (FLIS) under NSN 5305-00-334-9046. 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