PartsTable TECHNICAL DATA SHEET
JULY 2026Technical Data Sheet

2559M-12A-3000FBValve,cylinder,gas

Thermo Valves Corp · NSN 8120-00-142-9246 · FSC 8120 · No Item Name Available
Verified by PartsTable
NSN 8120-00-142-9246 — this item is cataloged by the U.S. Government under National Stock Number 8120-00-142-9246. Primary manufacturer part number: 2559M-12A-3000FB.
Features
  • Valve,cylinder,gas — FSC 8120
  • Second End Style Designator: PLAIN
  • First End Style Designator: HIGH PRESSURE FLARE
  • First End Thread Pitch Diameters: +0.9186 TO 0.9222 INCHES IN
  • End Connection Quantity: 2
  • Nondefinitive Spec/std Data: V26-591-2 TYPE
  • Operating Pressure: 2400.0 POUNDS PER SQUARE INCH (PSI) MAXIMUM LBS
  • Flow Control Device: DISK, FLAT
Applications
  • Flow control in piping systems
  • Pressure regulation
  • Steam and fluid isolation
  • Applications requiring Copper Alloy 377 Body construction
General Description

The Valve,cylinder,gas, cataloged under National Stock Number 8120-00-142-9246, is classified within Federal Supply Class 8120 (No Item Name Available) of the Containers, Packaging, and Packing Supplies group. The primary manufacturer of record is Thermo Valves Corp. Government technical data includes 15 verified specifications, sourced from the Federal Logistics Information System (FLIS). This item has 7 commercial cross-references from 3 manufacturers, enabling identification through both NSN and commercial part number lookups. 12 verified substitutes exist in the FLIS interchangeability database. Current acquisition status: Cancelled.

Technical Specifications
ParameterValue
NSN8120-00-142-9246
Primary Part Number2559M-12A-3000FB
Item NameValve,cylinder,gas
FSC / FSG8120 / 81 — No Item Name Available
ManufacturerThermo Valves Corp
StatusCANCELLED
Second End Style DesignatorPLAIN
First End Style DesignatorHIGH PRESSURE FLARE
First End Thread Pitch Diameters+0.9186 TO 0.9222 INCHES IN
End Connection Quantity2
Nondefinitive Spec/std DataV26-591-2 TYPE
Operating Pressure2400.0 POUNDS PER SQUARE INCH (PSI) MAXIMUM LBS
Flow Control DeviceDISK, FLAT
Second End Relationship with First EndNOT IDENTICAL
Valve Operation MethodWHEEL
MaterialCOPPER ALLOY 377 BODY
Special MarkingsINERT O.T.
Material Document and ClassificationQQ-B-626, ALLOY 377 FED SPEC SINGLE MATERIAL RESPONSE BODY
Body StyleANGLE GIVE "ADQM" AND "ADQN" ONLY IF FLANGED ONE OR TWO ENDS
MaterialCOPPER ALLOY SEAT
Temp Rating70.0 FAHRENHEIT DEGF
Lifecycle & Compliance
Acquisition StatusCANCELLED
HAZMATNo
Verified Substitutes 12
8120-00-216-6799 INTERCHANGEABLE
Cap,valve,gas Cylinder Outlet
8120-00-281-3798 INTERCHANGEABLE
Valve,cylinder,gas
8120-00-281-3799 INTERCHANGEABLE
Valve,cylinder,gas
8120-00-281-3802 INTERCHANGEABLE
Valve,cylinder,gas
8120-00-281-3805 INTERCHANGEABLE
Valve,cylinder,gas
8120-00-283-09251250C2 INTERCHANGEABLE
Valve,cylinder,gas
Superior Valve Co
8120-00-597-0888 INTERCHANGEABLE
Valve,cylinder,gas
8120-00-803-2172 INTERCHANGEABLE
Valve,cylinder,gas
8120-01-224-62041100-346B INTERCHANGEABLE
Valve,cylinder,gas
Superior Valve Co
8120-01-524-6760 INTERCHANGEABLE
Valve,cylinder,gas
Cross-Reference Index
Part NumberManufacturer
2559M-12A-3000FB Thermo Valves Corp (USA)
AA59860-065/063 Federal Commercial Item Description Promulgated by General Services Administration Washington DC (USA)
MIL-V-2/26 Military Specifications Promulgated by Military Departments/agencies Under Authority of Defense Standardization Manual 4120 3-M
V26-590-2/5 Military Specifications Promulgated by Military Departments/agencies Under Authority of Defense Standardization Manual 4120 3-M
MIL-DTL-2 Military Specifications Promulgated by Military Departments/agencies Under Authority of Defense Standardization Manual 4120 3-M
A-A-59860 Federal Commercial Item Description Promulgated by General Services Administration Washington DC (USA)
MIL-DTL-2/26 Military Specifications Promulgated by Military Departments/agencies Under Authority of Defense Standardization Manual 4120 3-M
Related Parts
8120-00-216-6799INTERCHANGEABLE
CAP,VALVE,GAS CYLINDER OUTLET
8120-00-281-3798INTERCHANGEABLE
VALVE,CYLINDER,GAS
8120-00-281-3799INTERCHANGEABLE
VALVE,CYLINDER,GAS
8120-00-281-3802INTERCHANGEABLE
VALVE,CYLINDER,GAS
8120-00-281-3805INTERCHANGEABLE
VALVE,CYLINDER,GAS
8120-00-283-0925INTERCHANGEABLE
VALVE,CYLINDER,GAS
1250C2
8120-00-597-0888INTERCHANGEABLE
VALVE,CYLINDER,GAS
8120-00-803-2172INTERCHANGEABLE
VALVE,CYLINDER,GAS
8120-01-224-6204INTERCHANGEABLE
VALVE,CYLINDER,GAS
1100-346B
8120-01-524-6760INTERCHANGEABLE
VALVE,CYLINDER,GAS
8120-01-524-6772INTERCHANGEABLE
VALVE,CYLINDER,GAS
8120-01-527-2850INTERCHANGEABLE
VALVE,CYLINDER,GAS

Frequently Asked Questions

What is NSN 8120-00-142-9246?

NSN 8120-00-142-9246 is a Valve,cylinder,gas, manufactured by Thermo Valves Corp, classified under FSC 8120 (No Item Name Available). Status: cancelled.

What are the part numbers for NSN 8120-00-142-9246?

NSN 8120-00-142-9246 has 7 cross-referenced part numbers: 2559M-12A-3000FB (Thermo Valves Corp), AA59860-065/063 (Federal Commercial Item Description Promulgated by General Services Administration Washington DC), MIL-V-2/26 (Military Specifications Promulgated by Military Departments/agencies Under Authority of Defense Standardization Manual 4120 3-M), V26-590-2/5 (Military Specifications Promulgated by Military Departments/agencies Under Authority of Defense Standardization Manual 4120 3-M), MIL-DTL-2 (Military Specifications Promulgated by Military Departments/agencies Under Authority of Defense Standardization Manual 4120 3-M) and 2 more.

What NSN replaces 8120-00-142-9246?

There are 12 known substitutes for 8120-00-142-9246: 8120-00-216-6799, 8120-00-281-3798, 8120-00-281-3799 and 9 more. Verify interchangeability with system specifications before substitution.

What are the specifications of 2559M-12A-3000FB?

Key specifications for 2559M-12A-3000FB: Second End Style Designator: PLAIN; First End Style Designator: HIGH PRESSURE FLARE; First End Thread Pitch Diameters: +0.9186 TO 0.9222 INCHES IN; End Connection Quantity: 2. 15 total characteristics are documented in the Federal Logistics Information System.

Is NSN 8120-00-142-9246 still in active supply?

NSN 8120-00-142-9246 is currently cancelled. Check with the Defense Logistics Agency for current availability and authorized substitutes.

Validated with multiple authoritative sources, including Government, OEM, and Certified sources.
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