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Technical Data Sheet
PartsTable / COMPONENT / M-1861A
M-1861A ✓ 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: NICKEL ALLOY, end_item_identification: MORELAND VALVE CO 4.000 IN. THREE WAY,THREE PORT 150 LB BALL VALVE MODEL M-1861A A, valve_size_for_which_designed: 4.000 INCHES IN, valve_type_for_which_designed: BALL, material_document_and_classification: MIL-B-24059 MIL SPEC SINGLE MATERIAL RESPONSE, valve_model_number_for_which_designed: M-1861A A.

This product is currently in active production with full OEM support. This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 4820-01-084-3584, 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
M-1861A
NSN: 4820-01-084-3584
FSC: 4820
CAGE: 27424 — MORLAND VALVE CO INC SUB OF SMITH VALVE CORP (USA)
SPECIFICATIONS
materialNICKEL ALLOY
end_item_identificationMORELAND VALVE CO 4.000 IN. THREE WAY,THREE PORT 150 LB BALL VALVE MODEL M-1861A A
valve_size_for_which_designed4.000 INCHES IN
valve_type_for_which_designedBALL
material_document_and_classificationMIL-B-24059 MIL SPEC SINGLE MATERIAL RESPONSE
valve_model_number_for_which_designedM-1861A A
NSN4820-01-084-3584
COMPONENT DIAGRAM
GATE VALVE — FULL OPEN OR FULL CLOSE ONLY Rising STEM BONNET FLOW → → FLOW SEATS — — SIZE: — · — · — PN: M-1861A · 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
•
SEAT ANGLE IN DEG: 45.000 NOMINAL
•
SEATING SURFACE SHAPE: ANGULAR
•
MATERIAL: PLASTIC POLYTETRAFLUOROETHYLENE OVERALL
•
STYLE DESIGNATOR: PLAIN
•
BODY INSIDE DIAMETER: 2.588 INCHES NOMINAL IN
•
BODY OUTSIDE DIAMETER: 3.265 INCHES NOMINAL IN
TECHNICAL CHARACTERISTICS (FLIS)
SEAT ANGLE IN DEG45.000 NOMINAL
SEATING SURFACE SHAPEANGULAR
MATERIALPLASTIC POLYTETRAFLUOROETHYLENE OVERALL
STYLE DESIGNATORPLAIN
OVERALL HEIGHT0.266 INCHES NOMINAL IN
BODY INSIDE DIAMETER2.588 INCHES NOMINAL IN
BODY OUTSIDE DIAMETER3.265 INCHES NOMINAL IN
VERIFIED SUBSTITUTES & CROSS-REFERENCES 10
B1948MVInterchangeable
interchangeable cross-reference
interchangeable
M-1861A SHEET 4 PIECE 10Interchangeable
interchangeable cross-reference
interchangeable
M-1861AInterchangeable
interchangeable cross-reference
interchangeable
S-1941Interchangeable
interchangeable cross-reference
interchangeable
M-1861A SHEET 5 PIECE 7Interchangeable
interchangeable cross-reference
interchangeable
S-1944Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusACTIVE
AvailabilityOEM and secondary market
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is M-1861A?
M-1861A is a SEAT,VALVE.
What parts can replace M-1861A?
There are 10 known substitutes for M-1861A: B1948MV, M-1861A SHEET 4 PIECE 10, M-1861A and 7 more. Substitute compatibility should be verified for your specific system.
What is the NSN for M-1861A?
M-1861A is cataloged in the Federal Logistics Information System (FLIS) under NSN 4820-01-084-3584. 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