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663121-1 — SEAT,VALVE

✓ Government record, cited
— · GATE VALVE
PRODUCT OVERVIEW

663121-1: SEAT,VALVE.

The SEAT,VALVE is a the manufacturer industrial component. Key specifications include material: STEEL COMP 303 OVERALL, flange_diameter: 1.000 INCHES NOMINAL IN, special_features: TWO 0.1510 IN. DIA HOLES EQUALLY SPACED IN FLANGE IN, style_designator: FAUCET, under_flange_height: 0.095 INCHES NOMINAL IN, body_inside_diameter: 0.125 INCHES NOMINAL IN.

This part is cataloged in the U.S. Government catalog under NSN 4820-00-799-6575, 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
663121-1
NSN: 4820-00-799-6575
FSC: 4820 — Valves, Nonpowered
CAGE: 59364 — HONEYWELL INTERNATIONAL INC. DBA HONEYWELL INTERNATIONAL DIV AEROSPACE - TEMPE (WEST WARNER ROAD) (USA)
SPECIFICATIONS
materialSTEEL COMP 303 OVERALL
flange_diameter1.000 INCHES NOMINAL IN
special_featuresTWO 0.1510 IN. DIA HOLES EQUALLY SPACED IN FLANGE IN
style_designatorFAUCET
under_flange_height0.095 INCHES NOMINAL IN
body_inside_diameter0.125 INCHES NOMINAL IN
body_outside_diameter0.367 INCHES NOMINAL IN
seating_surface_shapeFLAT
flange_seat_to_disk_end_height0.305 INCHES NOMINAL IN
material_document_and_classificationMIL-S-7720 COND A MIL SPEC SINGLE MATERIAL RESPONSE OVERALL
NSN4820-00-799-6575
COMPONENT DIAGRAM
GATE VALVE — FULL OPEN OR FULL CLOSE ONLY Rising STEM BONNET FLOW → → FLOW SEATS — — SIZE: — · — · — PN: 663121-1 · 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: 0.305 INCHES NOMINAL IN
•
FLANGE DIAMETER: 1.000 INCHES NOMINAL IN
•
BODY OUTSIDE DIAMETER: 0.367 INCHES NOMINAL IN
•
STYLE DESIGNATOR: FAUCET
•
MATERIAL DOCUMENT AND CLASSIFICATION: MIL-S-7720 COND A MIL SPEC SINGLE MATERIAL RESPONSE OVERALL
•
BODY INSIDE DIAMETER: 0.125 INCHES NOMINAL IN
•
UNDER FLANGE HEIGHT: 0.095 INCHES NOMINAL IN
TECHNICAL CHARACTERISTICS
FLANGE SEAT TO DISK END HEIGHT0.305 INCHES NOMINAL IN
FLANGE DIAMETER1.000 INCHES NOMINAL IN
BODY OUTSIDE DIAMETER0.367 INCHES NOMINAL IN
STYLE DESIGNATORFAUCET
MATERIAL DOCUMENT AND CLASSIFICATIONMIL-S-7720 COND A MIL SPEC SINGLE MATERIAL RESPONSE OVERALL
BODY INSIDE DIAMETER0.125 INCHES NOMINAL IN
SPECIAL FEATURESTWO 0.1510 IN. DIA HOLES EQUALLY SPACED IN FLANGE IN
UNDER FLANGE HEIGHT0.095 INCHES NOMINAL IN
MATERIALSTEEL COMP 303 OVERALL
SEATING SURFACE SHAPEFLAT
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

No substitute or cross-reference records for this part.

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 663121-1?
663121-1 is a SEAT,VALVE.
What is the NSN for 663121-1?
663121-1 is cataloged in the U.S. Government catalog under NSN 4820-00-799-6575. 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.