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53251-A ✓ Verified by PartsTable
— · COMPONENT
WHAT YOU NEED TO KNOW
Verify manufacturer and server generation compatibility Check if Option PN or Spare PN — same part, different channel
Confirm exact part number — similar PNs may be different parts
PRODUCT OVERVIEW

The LOCK,VALVE SPRING RETAINER is a the manufacturer industrial component. Key specifications include material: STEEL, overall_height: 0.375 INCHES NOMINAL IN, special_features: WEAPON SYSTEM ESSENTIAL, style_designator: STRAIGHT BORE W/TWO GROOVES, thread_provision: UNTHREADED, first_groove_width: 0.031 INCHES NOMINAL IN. This product is currently in active production with full OEM support.

This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 2805-00-358-4631, 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
53251-A
NSN: 2805-00-358-4631
FSC: 2805
CAGE: 63728 — SEALCRAFT CORPORATION (USA)
SPECIFICATIONS
materialSTEEL
overall_height0.375 INCHES NOMINAL IN
special_featuresWEAPON SYSTEM ESSENTIAL
style_designatorSTRAIGHT BORE W/TWO GROOVES
thread_provisionUNTHREADED
first_groove_width0.031 INCHES NOMINAL IN
second_groove_width0.031 INCHES NOMINAL IN
casehardening_indicatorNOT CASEHARDENED
largest_inside_diameter0.344 INCHES NOMINAL IN
minimum_inside_diameter0.188 INCHES IN
outside_included_angle_in_deg15.0
criticality_code_justificationFEAT
NSN2805-00-358-4631
COMPONENT DIAGRAM
COMPONENT MAIN IC EDGE CONNECTOR No detailed specs available LOCK,VALVE SPRING RETAINER TITLE COMPONENT PN 53251-A MFR LOCK,VALVE SPRING RETA
KEY FEATURES
•
GENERAL CHARACTERISTICS ITEM DESCRIPTION: W/TEN 0.625 IN. DIA BALLS,UPPER AND LOWER RACE,STRAIGHT BORE,W/KEYWAY,TO BE CLAMPED TO 1.498 IN. DIA HUB IN
TECHNICAL CHARACTERISTICS (FLIS)
GENERAL CHARACTERISTICS ITEM DESCRIPTIONW/TEN 0.625 IN. DIA BALLS,UPPER AND LOWER RACE,STRAIGHT BORE,W/KEYWAY,TO BE CLAMPED TO 1.498 IN. DIA HUB IN
VERIFIED SUBSTITUTES & CROSS-REFERENCES 15
21-489Interchangeable
interchangeable cross-reference
interchangeable
H9515-650-3Interchangeable
interchangeable cross-reference
interchangeable
H650-3Interchangeable
interchangeable cross-reference
interchangeable
CTCVT3234Interchangeable
interchangeable cross-reference
interchangeable
53251-AInterchangeable
interchangeable cross-reference
interchangeable
4908574Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusACTIVE
AvailabilityOEM and secondary market
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is 53251-A?
53251-A is a LOCK,VALVE SPRING RETAINER.
What parts can replace 53251-A?
There are 15 known substitutes for 53251-A: 21-489, H9515-650-3, H650-3 and 12 more. Substitute compatibility should be verified for your specific system.
What is the NSN for 53251-A?
53251-A is cataloged in the Federal Logistics Information System (FLIS) under NSN 2805-00-358-4631. 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