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Technical Data Sheet
PartsTable / COMPONENT / 21556N
21556N ✓ 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

RESISTOR,VARIABLE,WIRE WOUND,NON. Key specifications include material: STEEL CORROSION RESISTING OVERALL, overall_width: 12.6 MILLIMETERS MINIMUM AND 12.8 MILLIMETERS MAXIMUM MM, inside_diameter: 26.0 MILLIMETERS MINIMUM AND 50.0 MILLIMETERS MAXIMUM MM, style_designator: WIRE, fastening_device_type: SLOTTED HEXAGON HEAD SCREW, reliability_indicator: NOT ESTABLISHED. This product is currently in active production with full OEM support.

This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 4820-01-518-6578, 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
21556N
NSN: 4820-01-518-6578
FSC: 4820
CAGE: 35795 — LESLIE CONTROLS, INC. DBA LESLIE CONTROLS INC (USA)
SPECIFICATIONS
materialSTEEL CORROSION RESISTING OVERALL
overall_width12.6 MILLIMETERS MINIMUM AND 12.8 MILLIMETERS MAXIMUM MM
inside_diameter26.0 MILLIMETERS MINIMUM AND 50.0 MILLIMETERS MAXIMUM MM
section_quantity1
style_designatorWIRE
fastening_device_typeSLOTTED HEXAGON HEAD SCREW
reliability_indicatorNOT ESTABLISHED
NSN4820-01-518-6578
COMPONENT DIAGRAM
GATE VALVE — FULL OPEN OR FULL CLOSE ONLY Rising STEM BONNET FLOW → → FLOW SEATS — — SIZE: — · — · — PN: 21556N · 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
VERIFIED SUBSTITUTES & CROSS-REFERENCES 6
57240Interchangeable
interchangeable cross-reference
interchangeable
RVC2S359Interchangeable
interchangeable cross-reference
interchangeable
6204Interchangeable
interchangeable cross-reference
interchangeable
5724Interchangeable
interchangeable cross-reference
interchangeable
W10869-12Interchangeable
interchangeable cross-reference
interchangeable
21556N PC NO.2 57240Interchangeable
Same NIIN cross-reference
interchangeable
LIFECYCLE
StatusACTIVE
AvailabilityOEM and secondary market
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is 21556N?
21556N is a RESISTOR,VARIABLE,WIRE WOUND,NON.
What parts can replace 21556N?
There are 6 known substitutes for 21556N: 57240, RVC2S359, 6204 and 3 more. Substitute compatibility should be verified for your specific system.
What is the NSN for 21556N?
21556N is cataloged in the Federal Logistics Information System (FLIS) under NSN 4820-01-518-6578. 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