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21251-1 ✓ 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 CONVERTER,LIQUID OXYGEN is a the manufacturer industrial component. Key specifications include material: STEEL COMP 4140 OVERALL, head_style: FLAT COUNTERSUNK, point_style: OVAL, thread_class: 2A A, head_diameter: 2.031 INCHES NOMINAL IN, fastener_length: 5.000 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 1660-00-912-3275, 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
21251-1
NSN: 1660-00-912-3275
FSC: 1660
CAGE: 04577 — MISSION SYSTEMS ORCHARD PARK INC (USA)
SPECIFICATIONS
materialSTEEL COMP 4140 OVERALL
head_styleFLAT COUNTERSUNK
point_styleOVAL
thread_class2A A
head_diameter2.031 INCHES NOMINAL IN
fastener_length5.000 INCHES NOMINAL IN
special_featuresONE DRILLED SLOT ON SIDE OF HEAD,0.188 INCH NOMINAL IN WIDTH IN
thread_directionRIGHT-HAND
countersink_angle78.0 DEGREES NOMINAL
internal_drive_styleW/O INTERNAL DRIVE
nominal_thread_diameter1.125 INCHES IN
thread_quantity_per_inch7
NSN1660-00-912-3275
COMPONENT DIAGRAM
COMPONENT MAIN IC EDGE CONNECTOR No detailed specs available CONVERTER,LIQUID OXYGEN TITLE COMPONENT PN 21251-1 MFR CONVERTER,LIQUID OXYGE
KEY FEATURES
•
REFERENCE DATA AND LITERATURE: T.O. 15X2-6-3-53
•
FSC APPLICATION DATA: BREATHING OXYGEN SYSTEM
TECHNICAL CHARACTERISTICS (FLIS)
REFERENCE DATA AND LITERATURET.O. 15X2-6-3-53
FSC APPLICATION DATABREATHING OXYGEN SYSTEM
END ITEM IDENTIFICATIONC-141A AIRCRAFT A
VERIFIED SUBSTITUTES & CROSS-REFERENCES 8
GCU20/AInterchangeable
interchangeable cross-reference
interchangeable
10C-0012-75Interchangeable
interchangeable cross-reference
interchangeable
MIL-C-27652Interchangeable
interchangeable cross-reference
interchangeable
M25666/6Interchangeable
interchangeable cross-reference
interchangeable
8148650Interchangeable
interchangeable cross-reference
interchangeable
21251-1Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusACTIVE
AvailabilityOEM and secondary market
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is 21251-1?
21251-1 is a CONVERTER,LIQUID OXYGEN.
What parts can replace 21251-1?
There are 8 known substitutes for 21251-1: GCU20/A, 10C-0012-75, MIL-C-27652 and 5 more. Substitute compatibility should be verified for your specific system.
What is the NSN for 21251-1?
21251-1 is cataloged in the Federal Logistics Information System (FLIS) under NSN 1660-00-912-3275. 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