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Technical Data Sheet
PartsTable / COMPONENT / 2129X
2129X ✓ 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 VALVE ASSEMBLY is a the manufacturer industrial component. Key specifications include material: STEEL OVERALL, thread_class: 2A FIRST END A, connection_type: THREADED EXTERNAL BOSS FIRST END, connection_style: FLARED (TUBE) FIRST END, flow_control_device: DISK, nominal_thread_size: 1.250 INCHES FIRST END 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 4820-00-008-9941, 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
2129X
NSN: 4820-00-008-9941
FSC: 4820
CAGE: 75214 — KAHLENBERG INDUSTRIES, INC. DBA KAHLENBERG INDUSTRIES INC (USA)
SPECIFICATIONS
materialSTEEL OVERALL
thread_class2A FIRST END A
connection_typeTHREADED EXTERNAL BOSS FIRST END
connection_styleFLARED (TUBE) FIRST END
flow_control_deviceDISK
nominal_thread_size1.250 INCHES FIRST END IN
valve_operation_methodAUTOMATIC
thread_series_designatorUNF FIRST END
furnished_items_and_quantity1 GASKET
NSN4820-00-008-9941
COMPONENT DIAGRAM
GATE VALVE — FULL OPEN OR FULL CLOSE ONLY Rising STEM BONNET FLOW → → FLOW SEATS — — SIZE: — · — · — PN: 2129X · 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
•
VALVE OPERATION METHOD: AIR
TECHNICAL CHARACTERISTICS (FLIS)
SPECIAL FEATURESNAVY APPLICATION,DRAWING NR 2-1910
VALVE OPERATION METHODAIR
END ITEM IDENTIFICATIONAIR COMPRESSOR,LOW PRESSURE,KAHLENBERG BROTHERS
VERIFIED SUBSTITUTES & CROSS-REFERENCES 2
3578Interchangeable
interchangeable cross-reference
interchangeable
2129XInterchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusACTIVE
AvailabilityOEM and secondary market
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is 2129X?
2129X is a VALVE ASSEMBLY.
What parts can replace 2129X?
There are 2 known substitutes for 2129X: 3578, 2129X. Substitute compatibility should be verified for your specific system.
What is the NSN for 2129X?
2129X is cataloged in the Federal Logistics Information System (FLIS) under NSN 4820-00-008-9941. 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