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Technical Data Sheet
PartsTable / COMPONENT / 1B643 1/2
1B643 1/2 ✓ 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

The 1B643 1/2 is a the manufacturer industrial component. This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 4820-00-843-2779, 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
1B643 1/2
NSN: 4820-00-843-2779
FSC: 4820
CAGE: 14448 — HAMMOND VALVE CORP (USA)
SPECIFICATIONS
Part Number1B643 1/2
NSN4820-00-843-2779
COMPONENT DIAGRAM
GATE VALVE — FULL OPEN OR FULL CLOSE ONLY Rising STEM BONNET FLOW → → FLOW SEATS — — SIZE: — · — · — PN: 1B643 1/2 · 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
•
INLET RELATIONSHIP WITH OUTLET: IDENTICAL
•
STEM TYPE: RISING
•
MAXIMUM OPERATING TEMP AND MEDIA FOR WHICH DESIGNED: 353.0 FAHRENHEIT STEAM AND 150.0 FAHRENHEIT WATER-OIL-GAS DEGF
•
MATERIAL DOCUMENT AND CLASSIFICATION: ASTMCU0836 ASSN STD SINGLE MATERIAL RESPONSE BODY
•
OPERATING PRESSURE AND TYPE: 125.0 POUNDS PER SQUARE INCH (PSI) STEAM MAXIMUM REQUIRED AND 200.0 POUNDS PER SQUARE INCH (PSI) WATER AND OTHER LIQUIDS MAXIMUM REQUIRED LOCATION NOT OTHERWISE SPECIFIED LBS
•
THREAD SERIES DESIGNATOR: NPT
•
MATERIAL: COPPER ALLOY 836 BODY
TECHNICAL CHARACTERISTICS (FLIS)
INLET RELATIONSHIP WITH OUTLETIDENTICAL
STEM TYPERISING
MAXIMUM OPERATING TEMP AND MEDIA FOR WHICH DESIGNED353.0 FAHRENHEIT STEAM AND 150.0 FAHRENHEIT WATER-OIL-GAS DEGF
MATERIAL DOCUMENT AND CLASSIFICATIONASTMCU0836 ASSN STD SINGLE MATERIAL RESPONSE BODY
OPERATING PRESSURE AND TYPE125.0 POUNDS PER SQUARE INCH (PSI) STEAM MAXIMUM REQUIRED AND 200.0 POUNDS PER SQUARE INCH (PSI) WATER AND OTHER LIQUIDS MAXIMUM REQUIRED LOCATION NOT OTHERWISE SPECIFIED LBS
THREAD SERIES DESIGNATORNPT
MATERIALCOPPER ALLOY 836 BODY
MATERIALCOPPER ALLOY 836 DISK
MATERIAL DOCUMENT AND CLASSIFICATIONASTMCU0836 ASSN STD SINGLE MATERIAL RESPONSE SEAT
MATERIALCOPPER ALLOY 836 SEAT
VERIFIED SUBSTITUTES & CROSS-REFERENCES 29
42366Interchangeable
interchangeable cross-reference
interchangeable
F910Interchangeable
interchangeable cross-reference
interchangeable
94289Interchangeable
interchangeable cross-reference
interchangeable
705-273111CInterchangeable
interchangeable cross-reference
interchangeable
030-0018Interchangeable
interchangeable cross-reference
interchangeable
44-012Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusCANCELLED
Availability—
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is 1B643 1/2?
1B643 1/2 is a 1B643 1/2.
What parts can replace 1B643 1/2?
There are 29 known substitutes for 1B643 1/2: 42366, F910, 94289 and 26 more. Substitute compatibility should be verified for your specific system.
Is 1B643 1/2 still available?
1B643 1/2 is currently cancelled.
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✓ Validated with multiple authoritative sources, including Government, OEM, and Certified sources.
PartsTable Design LLC · partstable.com
Last verified: July 2026