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PartsTable / COMPONENT / MAI 587-9918
MAI 587-9918 ✓ 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 COMP 416 OVERALL, flange_diameter: 2.062 INCHES NOMINAL IN, style_designator: PLAIN FLANGED, seat_angle_in_deg: 45.000 NOMINAL, under_flange_height: 0.250 INCHES NOMINAL IN, body_inside_diameter: 1.187 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 4820-00-587-9918, 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
MAI 587-9918
NSN: 4820-00-587-9918
FSC: 4820
CAGE: 55084 — ARGUS MFG CORP (USA)
SPECIFICATIONS
materialSTEEL COMP 416 OVERALL
flange_diameter2.062 INCHES NOMINAL IN
style_designatorPLAIN FLANGED
seat_angle_in_deg45.000 NOMINAL
under_flange_height0.250 INCHES NOMINAL IN
body_inside_diameter1.187 INCHES NOMINAL IN
body_outside_diameter1.748 INCHES NOMINAL IN
seating_surface_shapeANGULAR
flange_seat_to_disk_end_height0.750 INCHES NOMINAL IN
NSN4820-00-587-9918
COMPONENT DIAGRAM
GATE VALVE — FULL OPEN OR FULL CLOSE ONLY Rising STEM BONNET FLOW → → FLOW SEATS — — SIZE: — · — · — PN: MAI 587-9918 · 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 INSIDE DIAMETER: 1.187 INCHES NOMINAL IN
•
SEATING SURFACE SHAPE: ANGULAR
•
MATERIAL: STEEL COMP 416 OVERALL
•
STYLE DESIGNATOR: PLAIN FLANGED
•
FLANGE SEAT TO DISK END HEIGHT: 0.750 INCHES NOMINAL IN
•
UNDER FLANGE HEIGHT: 0.250 INCHES NOMINAL IN
•
SEAT ANGLE IN DEG: 45.000 NOMINAL
•
FLANGE DIAMETER: 2.062 INCHES NOMINAL IN
TECHNICAL CHARACTERISTICS (FLIS)
BODY INSIDE DIAMETER1.187 INCHES NOMINAL IN
SEATING SURFACE SHAPEANGULAR
MATERIALSTEEL COMP 416 OVERALL
STYLE DESIGNATORPLAIN FLANGED
FLANGE SEAT TO DISK END HEIGHT0.750 INCHES NOMINAL IN
UNDER FLANGE HEIGHT0.250 INCHES NOMINAL IN
SEAT ANGLE IN DEG45.000 NOMINAL
FLANGE DIAMETER2.062 INCHES NOMINAL IN
BODY OUTSIDE DIAMETER1.748 INCHES NOMINAL IN
VERIFIED SUBSTITUTES & CROSS-REFERENCES 13
2781-4Interchangeable
interchangeable cross-reference
interchangeable
RH19B25Interchangeable
interchangeable cross-reference
interchangeable
11M600Interchangeable
interchangeable cross-reference
interchangeable
AWO-227-1Interchangeable
interchangeable cross-reference
interchangeable
32124Interchangeable
interchangeable cross-reference
interchangeable
D56243Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusACTIVE
AvailabilityOEM and secondary market
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is MAI 587-9918?
MAI 587-9918 is a SEAT,VALVE.
What parts can replace MAI 587-9918?
There are 13 known substitutes for MAI 587-9918: 2781-4, RH19B25, 11M600 and 10 more. Substitute compatibility should be verified for your specific system.
What is the NSN for MAI 587-9918?
MAI 587-9918 is cataloged in the Federal Logistics Information System (FLIS) under NSN 4820-00-587-9918. 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