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PartsTable / COMPONENT / H-8413 PIECE 181
H-8413 PIECE 181 ✓ 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 SEAT, flange_diameter: 1.998 INCHES NOMINAL IN, style_designator: PLAIN FLANGED, under_flange_height: 0.250 INCHES NOMINAL IN, body_inside_diameter: 1.000 INCHES NOMINAL IN, body_outside_diameter: 1.8765 INCHES NOMINAL IN. This product is currently in active production with full OEM support.

This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 4820-01-261-9742, 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
H-8413 PIECE 181
NSN: 4820-01-261-9742
FSC: 4820
CAGE: 8FGX3 — CURTISS-WRIGHT ELECTRO-MECHANICAL CORP DBA STEAM & AIR SOLUTIONS DIV CURTISS-WRIGHT STEAM AND AIR SOLUTIONS (USA)
SPECIFICATIONS
materialSTEEL SEAT
flange_diameter1.998 INCHES NOMINAL IN
style_designatorPLAIN FLANGED
under_flange_height0.250 INCHES NOMINAL IN
body_inside_diameter1.000 INCHES NOMINAL IN
body_outside_diameter1.8765 INCHES NOMINAL IN
seating_surface_shapeO-RING
seal_accommodation_typeGROOVED
flange_seat_to_disk_end_height0.375 INCHES NOMINAL IN
material_document_and_classificationMIL-S-890 CLASS C MIL SPEC SINGLE MATERIAL RESPONSE SEAT
NSN4820-01-261-9742
COMPONENT DIAGRAM
GATE VALVE — FULL OPEN OR FULL CLOSE ONLY Rising STEM BONNET FLOW → → FLOW SEATS — — SIZE: — · — · — PN: H-8413 PIECE 181 · 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
•
BODY OUTSIDE DIAMETER: 1.8765 INCHES NOMINAL IN
•
FLANGE SEAT TO DISK END HEIGHT: 0.375 INCHES NOMINAL IN
•
UNDER FLANGE HEIGHT: 0.250 INCHES NOMINAL IN
•
SEATING SURFACE SHAPE: O-RING
•
MATERIAL DOCUMENT AND CLASSIFICATION: MIL-S-890 CLASS C MIL SPEC SINGLE MATERIAL RESPONSE SEAT
•
STYLE DESIGNATOR: PLAIN FLANGED
•
MATERIAL: STEEL SEAT
•
FLANGE DIAMETER: 1.998 INCHES NOMINAL IN
TECHNICAL CHARACTERISTICS (FLIS)
BODY OUTSIDE DIAMETER1.8765 INCHES NOMINAL IN
FLANGE SEAT TO DISK END HEIGHT0.375 INCHES NOMINAL IN
UNDER FLANGE HEIGHT0.250 INCHES NOMINAL IN
SEATING SURFACE SHAPEO-RING
MATERIAL DOCUMENT AND CLASSIFICATIONMIL-S-890 CLASS C MIL SPEC SINGLE MATERIAL RESPONSE SEAT
STYLE DESIGNATORPLAIN FLANGED
MATERIALSTEEL SEAT
FLANGE DIAMETER1.998 INCHES NOMINAL IN
SEAL ACCOMMODATION TYPEGROOVED
BODY INSIDE DIAMETER1.000 INCHES NOMINAL IN
VERIFIED SUBSTITUTES & CROSS-REFERENCES 8
H8-4-13Interchangeable
interchangeable cross-reference
interchangeable
1621NA69028Interchangeable
interchangeable cross-reference
interchangeable
120005Interchangeable
interchangeable cross-reference
interchangeable
H-8413 PIECE 201Interchangeable
interchangeable cross-reference
interchangeable
6705255SH52Interchangeable
interchangeable cross-reference
interchangeable
700204Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusACTIVE
AvailabilityOEM and secondary market
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is H-8413 PIECE 181?
H-8413 PIECE 181 is a SEAT,VALVE.
What parts can replace H-8413 PIECE 181?
There are 8 known substitutes for H-8413 PIECE 181: H8-4-13, 1621NA69028, 120005 and 5 more. Substitute compatibility should be verified for your specific system.
What is the NSN for H-8413 PIECE 181?
H-8413 PIECE 181 is cataloged in the Federal Logistics Information System (FLIS) under NSN 4820-01-261-9742. 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