PartsTable TECHNICAL DATA SHEET
JULY 2026Technical Data Sheet

C0181CSeat,valve

Griswold Industries Dba Cla-Val Co · NSN 4820-00-343-5999 · FSC 4820 · No Item Name Available
Verified by PartsTable
NSN 4820-00-343-5999 — this item is cataloged by the U.S. Government under National Stock Number 4820-00-343-5999. Primary manufacturer part number: C0181C.
Features
  • Seat,valve — FSC 4820
  • Thread Series Designator: UN SINGLE THREADED PORTION
  • Material: NICKEL ALLOY OVERALL
  • Style Designator: THREADED FLANGED
  • Thread Length: 0.100 INCHES NOMINAL SINGLE THREADED PORTION IN
  • Flange Diameter: 1.380 INCHES NOMINAL IN
  • Seat Angle in Deg: 45.000 NOMINAL
  • Body Inside Diameter: 1.000 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 4820-00-343-5999, is classified within Federal Supply Class 4820 (No Item Name Available) of the Valves group. The primary manufacturer of record is Griswold Industries Dba Cla-Val Co. Government technical data includes 13 verified specifications, sourced from the Federal Logistics Information System (FLIS). This item has 2 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
NSN4820-00-343-5999
Primary Part NumberC0181C
Item NameSeat,valve
FSC / FSG4820 / 48 — No Item Name Available
ManufacturerGriswold Industries Dba Cla-Val Co
StatusACTIVE
Thread Series DesignatorUN SINGLE THREADED PORTION
MaterialNICKEL ALLOY OVERALL
Style DesignatorTHREADED FLANGED
Thread Length0.100 INCHES NOMINAL SINGLE THREADED PORTION IN
Flange Diameter1.380 INCHES NOMINAL IN
Seat Angle in Deg45.000 NOMINAL
Body Inside Diameter1.000 INCHES NOMINAL IN
Nominal Thread Size1.250 INCHES SINGLE THREADED PORTION IN
Seating Surface ShapeANGULAR
Under Flange Height0.394 INCHES NOMINAL IN
Flange Seat to Disk End Height0.154 INCHES MINIMUM AND 0.158 INCHES MAXIMUM IN
Thread Class2A SINGLE THREADED PORTION A
Thread Quantity Per Inch14 SINGLE THREADED PORTION
Lifecycle & Compliance
Acquisition StatusACTIVE
HAZMATNo
Verified Substitutes 12
6135-00-043-0021 INTERCHANGEABLE
Battery,nonrechargeable
6135-00-043-4312 INTERCHANGEABLE
Battery,nonrechargeable
6135-00-087-0333VS149 INTERCHANGEABLE
Battery,nonrechargeable
L3 Technologies, Inc. Div Communication Systems-East
6135-00-112-8637BA305U INTERCHANGEABLE
Battery,nonrechargeable
Us Army Communications & Electronics Materiel Readiness Command Logistics Engineering Dir
6135-00-178-9527 INTERCHANGEABLE
Battery,nonrechargeable
6135-00-269-5843RM1R INTERCHANGEABLE
Battery,nonrechargeable
Duracell Inc
6135-00-412-1687 INTERCHANGEABLE
Battery,nonrechargeable
6135-00-557-8874119-104 INTERCHANGEABLE
Battery,nonrechargeable
Gow-Mac Instrument Co Div Gow-Mac Instrument Company
4920-00-590-0145C181 INTERCHANGEABLE
Table,tilting,gyro Instrument Te
Genisco Technology Corporation
6135-00-643-1306 INTERCHANGEABLE
Battery,nonrechargeable
Cross-Reference Index
Part NumberManufacturer
C0181C PRIMARY Griswold Industries Dba Cla-Val Co (USA)
C181 Griswold Industries Dba Cla-Val Co (USA)
Related Parts
6135-00-043-0021INTERCHANGEABLE
BATTERY,NONRECHARGEABLE
6135-00-043-4312INTERCHANGEABLE
BATTERY,NONRECHARGEABLE
6135-00-087-0333INTERCHANGEABLE
BATTERY,NONRECHARGEABLE
VS149
6135-00-112-8637INTERCHANGEABLE
BATTERY,NONRECHARGEABLE
BA305U
6135-00-178-9527INTERCHANGEABLE
BATTERY,NONRECHARGEABLE
6135-00-269-5843INTERCHANGEABLE
BATTERY,NONRECHARGEABLE
RM1R
6135-00-412-1687INTERCHANGEABLE
BATTERY,NONRECHARGEABLE
6135-00-557-8874INTERCHANGEABLE
BATTERY,NONRECHARGEABLE
119-104
4920-00-590-0145INTERCHANGEABLE
TABLE,TILTING,GYRO INSTRUMENT TE
C181
6135-00-643-1306INTERCHANGEABLE
BATTERY,NONRECHARGEABLE
6135-00-643-1310INTERCHANGEABLE
BATTERY,NONRECHARGEABLE
6135-00-643-1311INTERCHANGEABLE
BATTERY,NONRECHARGEABLE
R40

Frequently Asked Questions

What is NSN 4820-00-343-5999?

NSN 4820-00-343-5999 is a Seat,valve, manufactured by Griswold Industries Dba Cla-Val Co, classified under FSC 4820 (No Item Name Available). Status: active.

What are the part numbers for NSN 4820-00-343-5999?

NSN 4820-00-343-5999 has 2 cross-referenced part numbers: C0181C (Griswold Industries Dba Cla-Val Co), C181 (Griswold Industries Dba Cla-Val Co).

What NSN replaces 4820-00-343-5999?

There are 12 known substitutes for 4820-00-343-5999: 6135-00-043-0021, 6135-00-043-4312, 6135-00-087-0333 and 9 more. Verify interchangeability with system specifications before substitution.

What are the specifications of C0181C?

Key specifications for C0181C: Thread Series Designator: UN SINGLE THREADED PORTION; Material: NICKEL ALLOY OVERALL; Style Designator: THREADED FLANGED; Thread Length: 0.100 INCHES NOMINAL SINGLE THREADED PORTION IN. 13 total characteristics are documented in the Federal Logistics Information System.

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