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1998-00 — STEM,FLUID VALVE

✓ Government record, cited
— · GATE VALVE
PRODUCT OVERVIEW

1998-00: STEM,FLUID VALVE.

The STEM,FLUID VALVE is a the manufacturer industrial component. Key specifications include material: NICKEL ALLOY, special_features: LEVEL III; NEXT HIGHER ASSEMBLY: 4820-0530-7933 AND 4820-01-199-7933, end_item_identification: MARK TD-145 SSN 688, stem_actuating_end_type: THREADED EXTERNALLY, valve_size_for_which_designed: 0.250 INCHES IN, valve_type_for_which_designed: REGULATOR. This part is cataloged in the U.S.

Government catalog under NSN 4820-01-545-4092, 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
1998-00
NSN: 4820-01-545-4092
FSC: 4820 — Valves, Nonpowered
CAGE: 55378 — TRAC REGULATOR CO., INC. DBA TRAC REGULATOR CO INC (USA)
SPECIFICATIONS
materialNICKEL ALLOY
special_featuresLEVEL III; NEXT HIGHER ASSEMBLY: 4820-0530-7933 AND 4820-01-199-7933
end_item_identificationMARK TD-145 SSN 688
stem_actuating_end_typeTHREADED EXTERNALLY
valve_size_for_which_designed0.250 INCHES IN
valve_type_for_which_designedREGULATOR
valve_model_number_for_which_designed40741
NSN4820-01-545-4092
COMPONENT DIAGRAM
GATE VALVE — FULL OPEN OR FULL CLOSE ONLY Rising STEM BONNET FLOW → → FLOW SEATS — — SIZE: — · — · — PN: 1998-00 · OEM ⚠ VERIFY BEFORE ORDERING Gate valves = FULL OPEN or FULL CLOSE only — never throttle. Partial opening causes seat erosion and vibration. ✓ BROKER TIP Rising stem shows valve position visually — easier maintenance. Non-rising stem saves headroom. PARTSTABLE TECHNICAL DRAWING — NOT TO SCALE
KEY FEATURES
•
VALVE TYPE FOR WHICH DESIGNED: REGULATOR
•
STEM ACTUATING END TYPE: THREADED EXTERNALLY
•
VALVE MODEL NUMBER FOR WHICH DESIGNED: 40741
•
VALVE SIZE FOR WHICH DESIGNED: 0.250 INCHES IN
•
MATERIAL: NICKEL ALLOY
TECHNICAL CHARACTERISTICS
VALVE TYPE FOR WHICH DESIGNEDREGULATOR
STEM ACTUATING END TYPETHREADED EXTERNALLY
VALVE MODEL NUMBER FOR WHICH DESIGNED40741
VALVE SIZE FOR WHICH DESIGNED0.250 INCHES IN
SPECIAL FEATURESLEVEL III; NEXT HIGHER ASSEMBLY: 4820-0530-7933 AND 4820-01-199-7933
END ITEM IDENTIFICATIONMARK TD-145 SSN 688
MATERIALNICKEL ALLOY
OTHER ITEMS IN FSC 4820 — Valves, Nonpowered
Items in the same Federal Supply class. No interchangeability or substitution relationship is implied.
4820-00-000-0097 4820-00-001-0010 4820-00-001-0020 4820-00-001-0021 4820-00-001-0032 4820-00-001-0037 4820-00-001-0042 4820-00-001-1230
SUBSTITUTES & CROSS-REFERENCES 1
40741PC18Same NSN cross-reference
Same NSN cross-reference
Also cataloged under this NSN
LIFECYCLE
NSN statusActive· U.S. Government catalog
Acquisition advice: Normally procured from the manufacturer (OEM)No demilitarization required
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FREQUENTLY ASKED QUESTIONS
What is 1998-00?
1998-00 is a STEM,FLUID VALVE.
What parts can replace 1998-00?
There is 1 known substitute for 1998-00: 40741PC18. Substitute compatibility should be verified for your specific system.
What is the NSN for 1998-00?
1998-00 is cataloged in the U.S. Government catalog under NSN 4820-01-545-4092. This indicates validated use in U.S. government and defense supply chains.
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✓ PartsTable — the parts reference. Every fact cited to its source.
PartsTable Design LLC · partstable.com
U.S. Government catalog: edition PUBLOGDVD v12.0.0 (OCT 2026), edition date 2026-10-01, retrieved 2026-10-18.
PartsTable commercial catalog: edition Unified commercial catalog snapshot through 2026-09-28, edition date not on file, retrieved 2026-09-28.