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81321-A PIECE 1 — SEAT,VALVE

✓ Government record, cited
— · GATE VALVE
PRODUCT OVERVIEW

81321-A PIECE 1: SEAT,VALVE.

The SEAT,VALVE is a the manufacturer industrial component. Key specifications include material: NICKEL OR COPPER ALLOY OVERALL, thread_length: 0.500 INCHES NOMINAL SINGLE THREADED PORTION IN, flange_diameter: 2.500 INCHES NOMINAL IN, style_designator: THREADED FLANGED, seat_angle_in_deg: 30.000 NOMINAL, nominal_thread_size: 2.307 INCHES SINGLE THREADED PORTION IN. This part is cataloged in the U.S.

Government catalog under NSN 4820-00-036-0914, 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
81321-A PIECE 1
NSN: 4820-00-036-0914
FSC: 4820 — Valves, Nonpowered
CAGE: 73475 — SCHNEIDER ELECTRIC SYSTEMS USA INC (USA)
SPECIFICATIONS
materialNICKEL OR COPPER ALLOY OVERALL
thread_length0.500 INCHES NOMINAL SINGLE THREADED PORTION IN
flange_diameter2.500 INCHES NOMINAL IN
style_designatorTHREADED FLANGED
seat_angle_in_deg30.000 NOMINAL
nominal_thread_size2.307 INCHES SINGLE THREADED PORTION IN
under_flange_height0.500 INCHES NOMINAL IN
body_inside_diameter1.873 INCHES MINIMUM AND 1.877 INCHES MAXIMUM IN
seating_surface_shapeANGULAR
thread_quantity_per_inch16 SINGLE THREADED PORTION
thread_series_designatorUNS SINGLE THREADED PORTION
flange_seat_to_disk_end_height0.188 INCHES NOMINAL IN
NSN4820-00-036-0914
COMPONENT DIAGRAM
GATE VALVE — FULL OPEN OR FULL CLOSE ONLY Rising STEM BONNET FLOW → → FLOW SEATS — — SIZE: — · — · — PN: 81321-A PIECE 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: 0.188 INCHES NOMINAL IN
•
FLANGE DIAMETER: 2.500 INCHES NOMINAL IN
•
THREAD LENGTH: 0.500 INCHES NOMINAL SINGLE THREADED PORTION IN
•
STYLE DESIGNATOR: THREADED FLANGED
•
BODY INSIDE DIAMETER: 1.873 INCHES MINIMUM AND 1.877 INCHES MAXIMUM IN
•
NOMINAL THREAD SIZE: 2.307 INCHES SINGLE THREADED PORTION IN
•
UNDER FLANGE HEIGHT: 0.500 INCHES NOMINAL IN
•
THREAD QUANTITY PER INCH: 16 SINGLE THREADED PORTION
TECHNICAL CHARACTERISTICS
FLANGE SEAT TO DISK END HEIGHT0.188 INCHES NOMINAL IN
FLANGE DIAMETER2.500 INCHES NOMINAL IN
THREAD LENGTH0.500 INCHES NOMINAL SINGLE THREADED PORTION IN
STYLE DESIGNATORTHREADED FLANGED
BODY INSIDE DIAMETER1.873 INCHES MINIMUM AND 1.877 INCHES MAXIMUM IN
NOMINAL THREAD SIZE2.307 INCHES SINGLE THREADED PORTION IN
UNDER FLANGE HEIGHT0.500 INCHES NOMINAL IN
THREAD QUANTITY PER INCH16 SINGLE THREADED PORTION
MATERIALNICKEL OR COPPER ALLOY OVERALL
SEAT ANGLE IN DEG30.000 NOMINAL
SUBSTITUTES & CROSS-REFERENCES 1
18774Reference document
Same NSN cross-reference
Reference document — Secondary reference
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 81321-A PIECE 1?
81321-A PIECE 1 is a SEAT,VALVE.
What parts can replace 81321-A PIECE 1?
There is 1 known substitute for 81321-A PIECE 1: 18774. Substitute compatibility should be verified for your specific system.
What is the NSN for 81321-A PIECE 1?
81321-A PIECE 1 is cataloged in the U.S. Government catalog under NSN 4820-00-036-0914. 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.