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915D549H01 — SEAT,VALVE

✓ Government record, cited
— · GATE VALVE
PRODUCT OVERVIEW

915D549H01: SEAT,VALVE.

The SEAT,VALVE is a the manufacturer industrial component. Key specifications include material: STEEL BODY, seat_radius: 0.255 INCHES MINIMUM AND 0.259 INCHES MAXIMUM IN, thread_class: 3A SINGLE THREADED PORTION A, thread_length: 0.875 INCHES NOMINAL SINGLE THREADED PORTION IN, flange_diameter: 2.460 INCHES MINIMUM AND 2.480 INCHES MAXIMUM IN, style_designator: THREADED FLANGED. This part is cataloged in the U.S.

Government catalog under NSN 4820-00-992-0630, 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
915D549H01
NSN: 4820-00-992-0630
FSC: 4820 — Valves, Nonpowered
CAGE: 90099 — NORTHROP GRUMMAN SYSTEMS CORPORATION DIV MARINE SYSTEMS (USA)
SPECIFICATIONS
materialSTEEL BODY
seat_radius0.255 INCHES MINIMUM AND 0.259 INCHES MAXIMUM IN
thread_class3A SINGLE THREADED PORTION A
thread_length0.875 INCHES NOMINAL SINGLE THREADED PORTION IN
flange_diameter2.460 INCHES MINIMUM AND 2.480 INCHES MAXIMUM IN
style_designatorTHREADED FLANGED
nominal_thread_size2.000 INCHES SINGLE THREADED PORTION IN
under_flange_height0.875 INCHES NOMINAL IN
fsc_application_dataSTEAM TURBINE,ELECTRIC GENERATION
seating_surface_shapeRADIAL
thread_quantity_per_inch12 SINGLE THREADED PORTION
thread_series_designatorUN SINGLE THREADED PORTION
NSN4820-00-992-0630
COMPONENT DIAGRAM
GATE VALVE — FULL OPEN OR FULL CLOSE ONLY Rising STEM BONNET FLOW → → FLOW SEATS — — SIZE: — · — · — PN: 915D549H01 · 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
•
FLANGE SEAT TO DISK END HEIGHT: 1.000 INCHES NOMINAL IN
•
FLANGE DIAMETER: 2.460 INCHES MINIMUM AND 2.480 INCHES MAXIMUM IN
•
FSC APPLICATION DATA: STEAM TURBINE,ELECTRIC GENERATION
•
THREAD LENGTH: 0.875 INCHES NOMINAL SINGLE THREADED PORTION IN
•
BODY STEPPED INSIDE DIAMETER: 0.687 INCHES NOMINAL FIRST STEP IN
•
STYLE DESIGNATOR: THREADED FLANGED
•
MATERIAL DOCUMENT AND CLASSIFICATION: DE15-15B MFR REF SINGLE MATERIAL RESPONSE BODY
TECHNICAL CHARACTERISTICS
FLANGE SEAT TO DISK END HEIGHT1.000 INCHES NOMINAL IN
FLANGE DIAMETER2.460 INCHES MINIMUM AND 2.480 INCHES MAXIMUM IN
FSC APPLICATION DATASTEAM TURBINE,ELECTRIC GENERATION
THREAD LENGTH0.875 INCHES NOMINAL SINGLE THREADED PORTION IN
BODY STEPPED INSIDE DIAMETER0.687 INCHES NOMINAL FIRST STEP IN
BODY STEPPED INSIDE DIAMETER0.966 INCHES NOMINAL SECOND STEP IN
STYLE DESIGNATORTHREADED FLANGED
MATERIAL DOCUMENT AND CLASSIFICATIONDE15-15B MFR REF SINGLE MATERIAL RESPONSE BODY
MATERIAL DOCUMENT AND CLASSIFICATIONSTELLITE HAYNES 6 MFR REF SINGLE MATERIAL RESPONSE SEAT
NOMINAL THREAD SIZE2.000 INCHES SINGLE THREADED PORTION IN
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 2
915D549PC1Same NSN cross-reference
Same NSN cross-reference
Also cataloged under this NSN
667J658PC9Same NSN cross-reference
Same NSN cross-reference
Also cataloged under this NSN
LIFECYCLE
NSN statusActive· U.S. Government catalog
Acquisition advice: Semi-active item — no replacement plannedNo demilitarization required
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FREQUENTLY ASKED QUESTIONS
What is 915D549H01?
915D549H01 is a SEAT,VALVE.
What parts can replace 915D549H01?
There are 2 known substitutes for 915D549H01: 915D549PC1, 667J658PC9. Substitute compatibility should be verified for your specific system.
What is the NSN for 915D549H01?
915D549H01 is cataloged in the U.S. Government catalog under NSN 4820-00-992-0630. 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.