PartsTable
Technical Data Sheet
PartsTable / COMPONENT / 203921B
203921B ✓ 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 203921B 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 6685-00-527-6545, 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
203921B
NSN: 6685-00-527-6545
FSC: 6685
CAGE: 28265 — HERCULES ENGINE CO INC (USA)
SPECIFICATIONS
Part Number203921B
NSN6685-00-527-6545
COMPONENT DIAGRAM
COMPONENT MAIN IC EDGE CONNECTOR No detailed specs available 203921B TITLE COMPONENT PN 203921B MFR 203921B
KEY FEATURES
•
OPERATING TEMP RATING: 106.0 FAHRENHEIT NOMINAL DEGF
•
FLOW CONTROL DEVICE: CHOKE
•
INSIDE MOUNTING SURFACE TO VALVE SEAT DISTANCE: 2.120 INCHES IN
•
THREAD SIZE AND SERIES/TYPE DESIGNATOR: 1-1/2-18 UNEF
•
USAGE DESIGN: COOL WATER
•
SPRING OPERATED PRESSURE RELIEF: PROVIDED
•
MOUNTING METHOD: THREADED
•
ACCESSORY COMPONENTS AND QUANTITY: GASKET,MTG
TECHNICAL CHARACTERISTICS (FLIS)
OPERATING TEMP RATING106.0 FAHRENHEIT NOMINAL DEGF
FLOW CONTROL DEVICECHOKE
INSIDE MOUNTING SURFACE TO VALVE SEAT DISTANCE2.120 INCHES IN
THREAD SIZE AND SERIES/TYPE DESIGNATOR1-1/2-18 UNEF
USAGE DESIGNCOOL WATER
SPRING OPERATED PRESSURE RELIEFPROVIDED
MOUNTING METHODTHREADED
ACCESSORY COMPONENTS AND QUANTITYGASKET,MTG
CLOSING PRESSURE SETTING39.0 POUNDS PER SQUARE INCH NOMINAL LBS
OPENING TEMP RATING99.0 FAHRENHEIT NOMINAL DEGF
VERIFIED SUBSTITUTES & CROSS-REFERENCES 7
23516DInterchangeable
interchangeable cross-reference
interchangeable
854009Interchangeable
interchangeable cross-reference
interchangeable
16B854009Interchangeable
interchangeable cross-reference
interchangeable
3910811Interchangeable
interchangeable cross-reference
interchangeable
J910811Interchangeable
interchangeable cross-reference
interchangeable
208135Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusACTIVE
AvailabilityOEM and secondary market
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is 203921B?
203921B is a 203921B.
What parts can replace 203921B?
There are 7 known substitutes for 203921B: 23516D, 854009, 16B854009 and 4 more. Substitute compatibility should be verified for your specific system.
What is the NSN for 203921B?
203921B is cataloged in the Federal Logistics Information System (FLIS) under NSN 6685-00-527-6545. 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