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PartsTable / COMPONENT / N15521
N15521 ✓ Verified by PartsTable
— · GATE VALVE
WHAT YOU NEED TO KNOW
Full open or full close only — never throttle Rising stem shows position visually
Throttling a gate valve erodes seats
PRODUCT OVERVIEW

The SEAT,VALVE is a the manufacturer industrial component. Key specifications include material: STEEL OVERALL, thread_class: 2A SINGLE THREADED PORTION A, thread_length: 0.750 INCHES NOMINAL SINGLE THREADED PORTION IN, flange_diameter: 2.500 INCHES NOMINAL IN, style_designator: THREADED FLANGED, seat_angle_in_deg: 45.000 NOMINAL. This product is currently in active production with full OEM support.

This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 4820-01-117-7483, 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
N15521
NSN: 4820-01-117-7483
FSC: 4820
CAGE: 35795 — LESLIE CONTROLS, INC. DBA LESLIE CONTROLS INC (USA)
SPECIFICATIONS
materialSTEEL OVERALL
thread_class2A SINGLE THREADED PORTION A
thread_length0.750 INCHES NOMINAL SINGLE THREADED PORTION IN
flange_diameter2.500 INCHES NOMINAL IN
style_designatorTHREADED FLANGED
seat_angle_in_deg45.000 NOMINAL
nominal_thread_size2.250 INCHES SINGLE THREADED PORTION IN
under_flange_height1.500 INCHES NOMINAL IN
body_inside_diameter1.250 INCHES NOMINAL IN
seating_surface_shapeANGULAR
thread_quantity_per_inch14 SINGLE THREADED PORTION
thread_series_designatorUNS SINGLE THREADED PORTION
NSN4820-01-117-7483
COMPONENT DIAGRAM
GATE VALVE — FULL OPEN OR FULL CLOSE ONLY Rising STEM BONNET FLOW → → FLOW SEATS — — SIZE: — · — · — PN: N15521 · 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
•
SEATING SURFACE SHAPE: ANGULAR
•
MATERIAL: STEEL OVERALL
•
STYLE DESIGNATOR: THREADED FLANGED
•
THREAD SERIES DESIGNATOR: UNS SINGLE THREADED PORTION
•
FLANGE DIAMETER: 2.500 INCHES NOMINAL IN
•
THREAD QUANTITY PER INCH: 14 SINGLE THREADED PORTION
•
FLANGE SEAT TO DISK END HEIGHT: 0.375 INCHES NOMINAL IN
•
NOMINAL THREAD SIZE: 2.250 INCHES SINGLE THREADED PORTION IN
TECHNICAL CHARACTERISTICS (FLIS)
SEATING SURFACE SHAPEANGULAR
MATERIALSTEEL OVERALL
STYLE DESIGNATORTHREADED FLANGED
THREAD SERIES DESIGNATORUNS SINGLE THREADED PORTION
FLANGE DIAMETER2.500 INCHES NOMINAL IN
THREAD QUANTITY PER INCH14 SINGLE THREADED PORTION
FLANGE SEAT TO DISK END HEIGHT0.375 INCHES NOMINAL IN
NOMINAL THREAD SIZE2.250 INCHES SINGLE THREADED PORTION IN
SEAT ANGLE IN DEG45.000 NOMINAL
UNDER FLANGE HEIGHT1.500 INCHES NOMINAL IN
VERIFIED SUBSTITUTES & CROSS-REFERENCES 13
15521Interchangeable
interchangeable cross-reference
interchangeable
8180000045Interchangeable
interchangeable cross-reference
interchangeable
3382Interchangeable
interchangeable cross-reference
interchangeable
K3382Interchangeable
interchangeable cross-reference
interchangeable
30215Interchangeable
interchangeable cross-reference
interchangeable
GGG-R-180 TY8CL2GRASZ1Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusACTIVE
AvailabilityOEM and secondary market
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is N15521?
N15521 is a SEAT,VALVE.
What parts can replace N15521?
There are 13 known substitutes for N15521: 15521, 8180000045, 3382 and 10 more. Substitute compatibility should be verified for your specific system.
What is the NSN for N15521?
N15521 is cataloged in the Federal Logistics Information System (FLIS) under NSN 4820-01-117-7483. 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