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C21-176 — DISK,VALVE

✓ Government record, cited
— · GATE VALVE
PRODUCT OVERVIEW

C21-176: DISK,VALVE.

The DISK,VALVE is a the manufacturer industrial component. Key specifications include material: COPPER ALLOY, outside_diameter: 1.022 INCHES NOMINAL IN, special_features: 2 HOLES 0.165 IN. DIA,0.433 IN.

C TO C; TWO 0.250 IN. RADIUS SLOTS ON PERJPHERY IN, style_designator: BUTTERFLY, material_document_and_classification: SAE 70, 1/2 HARD ASSN STD SINGLE MATERIAL RESPONSE. This part is cataloged in the U.S.

Government catalog under NSN 4820-00-358-5619, 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
C21-176
NSN: 4820-00-358-5619
FSC: 4820 — Valves, Nonpowered
CAGE: 79960 — ZENITH FUEL SYSTEMS LLC (USA)
SPECIFICATIONS
materialCOPPER ALLOY
outside_diameter1.022 INCHES NOMINAL IN
special_features2 HOLES 0.165 IN. DIA,0.433 IN. C TO C; TWO 0.250 IN. RADIUS SLOTS ON PERJPHERY IN
style_designatorBUTTERFLY
material_document_and_classificationSAE 70, 1/2 HARD ASSN STD SINGLE MATERIAL RESPONSE
NSN4820-00-358-5619
COMPONENT DIAGRAM
GATE VALVE — FULL OPEN OR FULL CLOSE ONLY Rising STEM BONNET FLOW → → FLOW SEATS — — SIZE: — · — · — PN: C21-176 · 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
•
OUTSIDE DIAMETER: 1.022 INCHES NOMINAL IN
•
STYLE DESIGNATOR: BUTTERFLY
•
MATERIAL DOCUMENT AND CLASSIFICATION: SAE 70, 1/2 HARD ASSN STD SINGLE MATERIAL RESPONSE
•
MATERIAL: COPPER ALLOY
TECHNICAL CHARACTERISTICS
OUTSIDE DIAMETER1.022 INCHES NOMINAL IN
STYLE DESIGNATORBUTTERFLY
MATERIAL DOCUMENT AND CLASSIFICATIONSAE 70, 1/2 HARD ASSN STD SINGLE MATERIAL RESPONSE
SPECIAL FEATURES2 HOLES 0.165 IN. DIA,0.433 IN. C TO C; TWO 0.250 IN. RADIUS SLOTS ON PERJPHERY IN
MATERIALCOPPER ALLOY
SUBSTITUTES & CROSS-REFERENCES 1
26803Same NSN cross-reference
Same NSN cross-reference
Also cataloged under this NSN
LIFECYCLE
NSN statusActive· U.S. Government catalog
Acquisition advice: Normally procured from the manufacturer (OEM)No demilitarization required
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FREQUENTLY ASKED QUESTIONS
What is C21-176?
C21-176 is a DISK,VALVE.
What parts can replace C21-176?
There is 1 known substitute for C21-176: 26803. Substitute compatibility should be verified for your specific system.
What is the NSN for C21-176?
C21-176 is cataloged in the U.S. Government catalog under NSN 4820-00-358-5619. This indicates validated use in U.S. government and defense supply chains.
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✓ PartsTable — the parts reference. Every fact cited to its source.
PartsTable Design LLC · partstable.com
U.S. Government catalog: edition PUBLOGDVD v12.0.0 (OCT 2026), edition date 2026-10-01, retrieved 2026-10-18.
PartsTable commercial catalog: edition Unified commercial catalog snapshot through 2026-09-28, edition date not on file, retrieved 2026-09-28.