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8528181 ✓ 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: PLASTIC POLYAMIDE NYLON OVERALL, overall_height: 0.125 INCHES NOMINAL IN, style_designator: PLAIN, body_inside_diameter: 0.188 INCHES NOMINAL IN, body_outside_diameter: 0.446 INCHES NOMINAL IN, seating_surface_shape: FLAT. This product is currently in active production with full OEM support.

This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 4820-00-622-1637, 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
8528181
NSN: 4820-00-622-1637
FSC: 4820
CAGE: 18876 — US ARMY AVIATION AND MISSILE COMMAND (USA)
SPECIFICATIONS
materialPLASTIC POLYAMIDE NYLON OVERALL
overall_height0.125 INCHES NOMINAL IN
style_designatorPLAIN
body_inside_diameter0.188 INCHES NOMINAL IN
body_outside_diameter0.446 INCHES NOMINAL IN
seating_surface_shapeFLAT
NSN4820-00-622-1637
COMPONENT DIAGRAM
GATE VALVE — FULL OPEN OR FULL CLOSE ONLY Rising STEM BONNET FLOW → → FLOW SEATS — — SIZE: — · — · — PN: 8528181 · 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: FLAT
•
BODY OUTSIDE DIAMETER: 0.446 INCHES NOMINAL IN
•
STYLE DESIGNATOR: PLAIN
•
BODY INSIDE DIAMETER: 0.188 INCHES NOMINAL IN
•
MATERIAL: PLASTIC POLYAMIDE NYLON OVERALL
TECHNICAL CHARACTERISTICS (FLIS)
SEATING SURFACE SHAPEFLAT
BODY OUTSIDE DIAMETER0.446 INCHES NOMINAL IN
STYLE DESIGNATORPLAIN
BODY INSIDE DIAMETER0.188 INCHES NOMINAL IN
OVERALL HEIGHT0.125 INCHES NOMINAL IN
MATERIALPLASTIC POLYAMIDE NYLON OVERALL
VERIFIED SUBSTITUTES & CROSS-REFERENCES 5
AS31545Interchangeable
interchangeable cross-reference
interchangeable
31545Interchangeable
interchangeable cross-reference
interchangeable
PA3247Interchangeable
interchangeable cross-reference
interchangeable
17730Interchangeable
interchangeable cross-reference
interchangeable
AMS-QQ-A-200/11Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusACTIVE
AvailabilityOEM and secondary market
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is 8528181?
8528181 is a SEAT,VALVE.
What parts can replace 8528181?
There are 5 known substitutes for 8528181: AS31545, 31545, PA3247 and 2 more. Substitute compatibility should be verified for your specific system.
What is the NSN for 8528181?
8528181 is cataloged in the Federal Logistics Information System (FLIS) under NSN 4820-00-622-1637. 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