PartsTable TECHNICAL DATA SHEET
JULY 2026Technical Data Sheet

12131-42Seat,valve

Leslie Controls, Inc. Dba Leslie Controls Inc · NSN 4820-01-039-5995 · FSC 4820 · No Item Name Available
Verified by PartsTable
NSN 4820-01-039-5995 — this item is cataloged by the U.S. Government under National Stock Number 4820-01-039-5995. Primary manufacturer part number: 12131-42.
Features
  • Seat,valve — FSC 4820
  • Flange Diameter: 3.125 INCHES NOMINAL IN
  • Style Designator: THREADED FLANGED
  • Material: NICKEL ALLOY OVERALL
  • Thread Series Designator: UNS SINGLE THREADED PORTION
  • Body Inside Diameter: 2.515 INCHES NOMINAL IN
  • Thread Quantity Per Inch: 14 SINGLE THREADED PORTION
  • Seat Radius: 0.125 INCHES NOMINAL IN
Applications
  • Flow control in piping systems
  • Pressure regulation
  • Steam and fluid isolation
  • Applications requiring Nickel Alloy Overall construction
General Description

The Seat,valve, cataloged under National Stock Number 4820-01-039-5995, is classified within Federal Supply Class 4820 (No Item Name Available) of the Valves group. The primary manufacturer of record is Leslie Controls, Inc. Dba Leslie Controls Inc. Government technical data includes 13 verified specifications, sourced from the Federal Logistics Information System (FLIS). This item has 3 commercial cross-references from 1 manufacturer, enabling identification through both NSN and commercial part number lookups. 12 verified substitutes exist in the FLIS interchangeability database. Current acquisition status: Active.

Technical Specifications
ParameterValue
NSN4820-01-039-5995
Primary Part Number12131-42
Item NameSeat,valve
FSC / FSG4820 / 48 — No Item Name Available
ManufacturerLeslie Controls, Inc. Dba Leslie Controls Inc
StatusACTIVE
Flange Diameter3.125 INCHES NOMINAL IN
Style DesignatorTHREADED FLANGED
MaterialNICKEL ALLOY OVERALL
Thread Series DesignatorUNS SINGLE THREADED PORTION
Body Inside Diameter2.515 INCHES NOMINAL IN
Thread Quantity Per Inch14 SINGLE THREADED PORTION
Seat Radius0.125 INCHES NOMINAL IN
Thread Length0.375 INCHES NOMINAL SINGLE THREADED PORTION IN
Flange Seat to Disk End Height0.375 INCHES NOMINAL IN
Seating Surface ShapeRADIAL
Nominal Thread Size2.937 INCHES SINGLE THREADED PORTION IN
Under Flange Height0.562 INCHES NOMINAL IN
Thread Class3A SINGLE THREADED PORTION A
Lifecycle & Compliance
Acquisition StatusACTIVE
HAZMATNo
Verified Substitutes 12
5133-00-227-9674 INTERCHANGEABLE
Drill,twist
5950-00-237-72112687 INTERCHANGEABLE
Coil,radio Frequency
Ohmite Holding, L.l.c. Dba Ohmite Manufacturing
5950-00-645-554711266 INTERCHANGEABLE
Transformer,power
Electronic Transformer Corp Div Electronic Transformer Corporation
3020-00-867-051812-13-1 INTERCHANGEABLE
Gear,spur
Carbonara Labs Inc
5355-00-937-368912131 INTERCHANGEABLE
Pointer
Aerosonic Llc
4820-00-950-7966HSRV-1-80 INTERCHANGEABLE
Valve,safety Relief
The Electric Heater Co Dba Hubbell Electric Heater Co.
5985-01-093-5609121-3-1 INTERCHANGEABLE
Antenna,uhf,los
Allard Nazarian Group, Inc. Dba Granite State Manufacturing
2925-01-103-6922 INTERCHANGEABLE
Point Set,breaker
2920-01-244-612812131 INTERCHANGEABLE
Contact Set,distributor
Stone Construction Equipment, Inc.
5342-01-293-951112131 INTERCHANGEABLE
Bracket,engine Accessory
Westerbeke Corporation
Cross-Reference Index
Part NumberManufacturer
12131 Leslie Controls, Inc. Dba Leslie Controls Inc (USA)
12131-2 Leslie Controls, Inc. Dba Leslie Controls Inc (USA)
12131-42 PRIMARY Leslie Controls, Inc. Dba Leslie Controls Inc (USA)
Related Parts
5133-00-227-9674INTERCHANGEABLE
DRILL,TWIST
5950-00-237-7211INTERCHANGEABLE
COIL,RADIO FREQUENCY
2687
5950-00-645-5547INTERCHANGEABLE
TRANSFORMER,POWER
11266
3020-00-867-0518INTERCHANGEABLE
GEAR,SPUR
12-13-1
5355-00-937-3689INTERCHANGEABLE
POINTER
12131
4820-00-950-7966INTERCHANGEABLE
VALVE,SAFETY RELIEF
HSRV-1-80
5985-01-093-5609INTERCHANGEABLE
ANTENNA,UHF,LOS
121-3-1
2925-01-103-6922INTERCHANGEABLE
POINT SET,BREAKER
2920-01-244-6128INTERCHANGEABLE
CONTACT SET,DISTRIBUTOR
12131
5342-01-293-9511INTERCHANGEABLE
BRACKET,ENGINE ACCESSORY
12131
7530-01-316-4455INTERCHANGEABLE
INDEX SHEET SET,LOOSE-LEAF BINDE
25187
3040-01-391-3913INTERCHANGEABLE
SHAFT,SHOULDERED
1213-12

Frequently Asked Questions

What is NSN 4820-01-039-5995?

NSN 4820-01-039-5995 is a Seat,valve, manufactured by Leslie Controls, Inc. Dba Leslie Controls Inc, classified under FSC 4820 (No Item Name Available). Status: active.

What are the part numbers for NSN 4820-01-039-5995?

NSN 4820-01-039-5995 has 3 cross-referenced part numbers: 12131 (Leslie Controls, Inc. Dba Leslie Controls Inc), 12131-2 (Leslie Controls, Inc. Dba Leslie Controls Inc), 12131-42 (Leslie Controls, Inc. Dba Leslie Controls Inc).

What NSN replaces 4820-01-039-5995?

There are 12 known substitutes for 4820-01-039-5995: 5133-00-227-9674, 5950-00-237-7211, 5950-00-645-5547 and 9 more. Verify interchangeability with system specifications before substitution.

What are the specifications of 12131-42?

Key specifications for 12131-42: Flange Diameter: 3.125 INCHES NOMINAL IN; Style Designator: THREADED FLANGED; Material: NICKEL ALLOY OVERALL; Thread Series Designator: UNS SINGLE THREADED PORTION. 13 total characteristics are documented in the Federal Logistics Information System.

Validated with multiple authoritative sources, including Government, OEM, and Certified sources.
PartsTable Design LLC · partstable.com