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Technical Data Sheet
PartsTable / COMPONENT / 21820Q5
21820Q5 ✓ 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

VALVE,LINEAR,DIRECTIONAL CONTROL. Key specifications include width: 0.372 INCHES NOMINAL IN, length: 0.531 INCHES NOMINAL IN, radius: 0.688 INCHES NOMINAL IN, material: STEEL COMP 416, nut_style: HEXAGON, thickness: 0.570 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 4810-01-544-3952, 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
21820Q5
NSN: 4810-01-544-3952
FSC: 4810
CAGE: 03950 — NAVAL INVENTORY CONTROL POINT MECHANICSBURG (USA)
SPECIFICATIONS
width0.372 INCHES NOMINAL IN
length0.531 INCHES NOMINAL IN
radius0.688 INCHES NOMINAL IN
materialSTEEL COMP 416
nut_styleHEXAGON
thickness0.570 INCHES NOMINAL IN
top_styleFLAT
body_styleRECTANGULAR COMMUTATOR
nut_height0.043 INCHES MINIMUM AND 0.050 INCHES MAXIMUM IN
thread_size1/8 IN. - 27 LOCATION NOT OTHERWISE SPECIFIED IN
thread_class2B
overall_width0.807 INCHES NOMINAL IN
NSN4810-01-544-3952
COMPONENT DIAGRAM
GATE VALVE — FULL OPEN OR FULL CLOSE ONLY Rising STEM BONNET FLOW → → FLOW SEATS — — SIZE: — · — · — PN: 21820Q5 · 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 9
2-1820Interchangeable
interchangeable cross-reference
interchangeable
22108101Interchangeable
interchangeable cross-reference
interchangeable
AN345B1Interchangeable
interchangeable cross-reference
interchangeable
FC3511Interchangeable
interchangeable cross-reference
interchangeable
L14883Interchangeable
interchangeable cross-reference
interchangeable
21820 FN 14Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusACTIVE
AvailabilityOEM and secondary market
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is 21820Q5?
21820Q5 is a VALVE,LINEAR,DIRECTIONAL CONTROL.
What parts can replace 21820Q5?
There are 9 known substitutes for 21820Q5: 2-1820, 22108101, AN345B1 and 6 more. Substitute compatibility should be verified for your specific system.
What is the NSN for 21820Q5?
21820Q5 is cataloged in the Federal Logistics Information System (FLIS) under NSN 4810-01-544-3952. 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