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21758742 ✓ 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 DIAPHRAGM,VALVE,FLAT is a the manufacturer industrial component. Key specifications include material: NICKEL ALLOY OVERALL, flange_diameter: 2.000 INCHES NOMINAL IN, style_designator: THREADED FLANGED, under_flange_height: 0.188 INCHES NOMINAL IN, body_inside_diameter: 1.516 INCHES NOMINAL IN, seating_surface_shape: FLAT. This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 4820-01-269-4752, 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
21758742
NSN: 4820-01-269-4752
FSC: 4820
CAGE: 35795 — LESLIE CONTROLS, INC. DBA LESLIE CONTROLS INC (USA)
SPECIFICATIONS
materialNICKEL ALLOY OVERALL
flange_diameter2.000 INCHES NOMINAL IN
style_designatorTHREADED FLANGED
under_flange_height0.188 INCHES NOMINAL IN
body_inside_diameter1.516 INCHES NOMINAL IN
seating_surface_shapeFLAT
flange_seat_to_disk_end_height0.125 INCHES NOMINAL IN
NSN4820-01-269-4752
COMPONENT DIAGRAM
GATE VALVE — FULL OPEN OR FULL CLOSE ONLY Rising STEM BONNET FLOW → → FLOW SEATS — — SIZE: — · — · — PN: 21758742 · 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
•
STYLE DESIGNATOR: THREADED FLANGED
•
MATERIAL: NICKEL ALLOY OVERALL
•
UNDER FLANGE HEIGHT: 0.188 INCHES NOMINAL IN
•
BODY INSIDE DIAMETER: 1.516 INCHES NOMINAL IN
•
FLANGE SEAT TO DISK END HEIGHT: 0.125 INCHES NOMINAL IN
•
FLANGE DIAMETER: 2.000 INCHES NOMINAL IN
TECHNICAL CHARACTERISTICS (FLIS)
SEATING SURFACE SHAPEFLAT
STYLE DESIGNATORTHREADED FLANGED
MATERIALNICKEL ALLOY OVERALL
UNDER FLANGE HEIGHT0.188 INCHES NOMINAL IN
BODY INSIDE DIAMETER1.516 INCHES NOMINAL IN
FLANGE SEAT TO DISK END HEIGHT0.125 INCHES NOMINAL IN
FLANGE DIAMETER2.000 INCHES NOMINAL IN
VERIFIED SUBSTITUTES & CROSS-REFERENCES 13
N580Interchangeable
interchangeable cross-reference
interchangeable
40401-408Interchangeable
interchangeable cross-reference
interchangeable
ASTM F1370Interchangeable
interchangeable cross-reference
interchangeable
329-662-79Interchangeable
interchangeable cross-reference
interchangeable
N-731Interchangeable
interchangeable cross-reference
interchangeable
NB32966279Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusCANCELLED
Availability—
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is 21758742?
21758742 is a DIAPHRAGM,VALVE,FLAT.
What parts can replace 21758742?
There are 13 known substitutes for 21758742: N580, 40401-408, ASTM F1370 and 10 more. Substitute compatibility should be verified for your specific system.
Is 21758742 still available?
21758742 is currently cancelled.
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✓ Validated with multiple authoritative sources, including Government, OEM, and Certified sources.
PartsTable Design LLC · partstable.com
Last verified: July 2026