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646439 — COCK,SHUTOFF,SCREW STEM

✓ Government record, cited
— · GATE VALVE
PRODUCT OVERVIEW

646439: COCK,SHUTOFF,SCREW STEM.

The COCK,SHUTOFF,SCREW STEM is a the manufacturer industrial component. Key specifications include flow_control_device: STEM, end_item_identification: 1983-1984 GMC VEHICLE, media_for_which_designed: FUEL/OIL, HYDROCARBON SINGLE RESPONSE. This part is cataloged in the U.S.

Government catalog under NSN 4820-01-309-1705, 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
646439
NSN: 4820-01-309-1705
FSC: 4820 — Valves, Nonpowered
CAGE: 7X677 — GENERAL MOTORS LLC DBA GENERAL MOTORS LLC (USA)
SPECIFICATIONS
flow_control_deviceSTEM
end_item_identification1983-1984 GMC VEHICLE
media_for_which_designedFUEL/OIL, HYDROCARBON SINGLE RESPONSE
NSN4820-01-309-1705
COMPONENT DIAGRAM
GATE VALVE — FULL OPEN OR FULL CLOSE ONLY Rising STEM BONNET FLOW → → FLOW SEATS — — SIZE: — · — · — PN: 646439 · 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
•
FLOW CONTROL DEVICE: STEM
•
MEDIA FOR WHICH DESIGNED: FUEL/OIL, HYDROCARBON SINGLE RESPONSE
TECHNICAL CHARACTERISTICS
FLOW CONTROL DEVICESTEM
MEDIA FOR WHICH DESIGNEDFUEL/OIL, HYDROCARBON SINGLE RESPONSE
END ITEM IDENTIFICATION1983-1984 GMC VEHICLE
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

No substitute or cross-reference records for this part.

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 646439?
646439 is a COCK,SHUTOFF,SCREW STEM.
What is the NSN for 646439?
646439 is cataloged in the U.S. Government catalog under NSN 4820-01-309-1705. 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.