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21F-C8M4-SC ITEM 18 — NUT,VALVE DISK

✓ Government record, cited
— · GATE VALVE
PRODUCT OVERVIEW

21F-C8M4-SC ITEM 18: NUT,VALVE DISK.

The NUT,VALVE DISK is a the manufacturer industrial component. Key specifications include material: STEEL CORROSION RESISTING, special_features: USED ON NPS 1 CLASS 150 NEWCO 43 STAINLESS STEEL GLOBE VALVE; NEWCO FIG 21F-C8M4-SC, end_item_identification: STRATEGIC SEALIFT CONVERSION SHIPS CLASS. This part is cataloged in the U.S.

Government catalog under NSN 4820-01-423-0016, 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
21F-C8M4-SC ITEM 18
NSN: 4820-01-423-0016
FSC: 4820 — Valves, Nonpowered
CAGE: 61661 — NEWMANS INC NEW JERSEY DIV (USA)
SPECIFICATIONS
materialSTEEL CORROSION RESISTING
special_featuresUSED ON NPS 1 CLASS 150 NEWCO 43 STAINLESS STEEL GLOBE VALVE; NEWCO FIG 21F-C8M4-SC
end_item_identificationSTRATEGIC SEALIFT CONVERSION SHIPS CLASS
NSN4820-01-423-0016
COMPONENT DIAGRAM
GATE VALVE — FULL OPEN OR FULL CLOSE ONLY Rising STEM BONNET FLOW → → FLOW SEATS — — SIZE: — · — · — PN: 21F-C8M4-SC ITEM 18 · 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
•
MATERIAL: STEEL CORROSION RESISTING
TECHNICAL CHARACTERISTICS
SPECIAL FEATURESUSED ON NPS 1 CLASS 150 NEWCO 43 STAINLESS STEEL GLOBE VALVE; NEWCO FIG 21F-C8M4-SC
END ITEM IDENTIFICATIONSTRATEGIC SEALIFT CONVERSION SHIPS CLASS
MATERIALSTEEL CORROSION RESISTING
OTHER ITEMS IN FSC 4820 — Valves, Nonpowered
Items in the same Federal Supply class. No interchangeability or substitution relationship is implied.
4820-00-000-0097 4820-00-001-0010 4820-00-001-0020 4820-00-001-0021 4820-00-001-0032 4820-00-001-0037 4820-00-001-0042 4820-00-001-1230
SUBSTITUTES & CROSS-REFERENCES 2
A0637-00 IT18Reference document
Same NSN cross-reference
Reference document — Secondary reference
A0637-00Reference document
Same NSN cross-reference
Reference document — Drawing number reference only
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 21F-C8M4-SC ITEM 18?
21F-C8M4-SC ITEM 18 is a NUT,VALVE DISK.
What parts can replace 21F-C8M4-SC ITEM 18?
There are 2 known substitutes for 21F-C8M4-SC ITEM 18: A0637-00 IT18, A0637-00. Substitute compatibility should be verified for your specific system.
What is the NSN for 21F-C8M4-SC ITEM 18?
21F-C8M4-SC ITEM 18 is cataloged in the U.S. Government catalog under NSN 4820-01-423-0016. 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.