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PartsTable / COMPONENT / 500051 ITEM NO 4
500051 ITEM NO 4 ✓ 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 RING,RETAINING 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 5325-01-644-2442, 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
500051 ITEM NO 4
NSN: 5325-01-644-2442
FSC: 5325
CAGE: 95169 — CURTISS-WRIGHT FLOW CONTROL CORPORATION DBA CURTISS-WRIGHT FLOW CONTROL CO DIV TARGET ROCK DIVISION (USA)
SPECIFICATIONS
Part Number500051 ITEM NO 4
NSN5325-01-644-2442
COMPONENT DIAGRAM
BOLT / SCREW — THREAD VERIFICATION REQUIRED Hex HEAD LENGTH: — THREAD: — × — MATERIAL: — PN: 500051 ITEM NO 4 · 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 11
500-051Interchangeable
interchangeable cross-reference
interchangeable
500005-1/BX-50FTInterchangeable
interchangeable cross-reference
interchangeable
342C195H06Interchangeable
interchangeable cross-reference
interchangeable
MIL-H-53076Interchangeable
interchangeable cross-reference
interchangeable
1978067-105Interchangeable
interchangeable cross-reference
interchangeable
ROM/PROM FAMILY 047Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusACTIVE
AvailabilityOEM and secondary market
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is 500051 ITEM NO 4?
500051 ITEM NO 4 is a RING,RETAINING.
What parts can replace 500051 ITEM NO 4?
There are 11 known substitutes for 500051 ITEM NO 4: 500-051, 500005-1/BX-50FT, 342C195H06 and 8 more. Substitute compatibility should be verified for your specific system.
What is the NSN for 500051 ITEM NO 4?
500051 ITEM NO 4 is cataloged in the Federal Logistics Information System (FLIS) under NSN 5325-01-644-2442. 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