PartsTable TECHNICAL DATA SHEET
JULY 2026Technical Data Sheet

3381Seat,valve

Lawler Manufacturing Company, Inc. · NSN 4820-00-074-8012 · FSC 4820 · No Item Name Available
Verified by PartsTable
NSN 4820-00-074-8012 — this item is cataloged by the U.S. Government under National Stock Number 4820-00-074-8012. Primary manufacturer part number: 3381.
Features
  • Seat,valve — FSC 4820
  • Nominal Thread Size: 1.625 INCHES SINGLE THREADED PORTION IN
  • Thread Series Designator: UNEF SINGLE THREADED PORTION
  • Thread Class: 2A SINGLE THREADED PORTION A
  • Flange Seat to Disk End Height: 0.375 INCHES NOMINAL IN
  • Under Flange Height: 0.250 INCHES NOMINAL IN
  • Seating Surface Shape: FLAT
  • Flange Diameter: 1.750 INCHES NOMINAL IN
Applications
  • Flow control in piping systems
  • Pressure regulation
  • Steam and fluid isolation
  • Applications requiring Copper Alloy Overall construction
General Description

The Seat,valve, cataloged under National Stock Number 4820-00-074-8012, is classified within Federal Supply Class 4820 (No Item Name Available) of the Valves group. The primary manufacturer of record is Lawler Manufacturing Company, Inc.. Government technical data includes 12 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
NSN4820-00-074-8012
Primary Part Number3381
Item NameSeat,valve
FSC / FSG4820 / 48 — No Item Name Available
ManufacturerLawler Manufacturing Company, Inc.
StatusACTIVE
Nominal Thread Size1.625 INCHES SINGLE THREADED PORTION IN
Thread Series DesignatorUNEF SINGLE THREADED PORTION
Thread Class2A SINGLE THREADED PORTION A
Flange Seat to Disk End Height0.375 INCHES NOMINAL IN
Under Flange Height0.250 INCHES NOMINAL IN
Seating Surface ShapeFLAT
Flange Diameter1.750 INCHES NOMINAL IN
Seal Accommodation TypeGROOVED
MaterialCOPPER ALLOY OVERALL
Style DesignatorTHREADED FLANGED
Body Inside Diameter1.313 INCHES NOMINAL IN
Thread Length0.156 INCHES NOMINAL SINGLE THREADED PORTION IN
Lifecycle & Compliance
Acquisition StatusACTIVE
HAZMATNo
Verified Substitutes 12
3110-00-100-07661B3963 INTERCHANGEABLE
Cone and Rollers,tapered Roller
Caterpillar Inc Div Caterpillar Defense
5910-00-186-84123-381 INTERCHANGEABLE
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Bae Systems Information and Electronic Systems Integration Inc.
6105-00-284-09743-381 INTERCHANGEABLE
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Electric Boat Corporation Div General Dynamics Electric Boat
5950-00-318-2668 INTERCHANGEABLE
Transformer,power
2910-00-373-156533381 INTERCHANGEABLE
Filter,fluid
Wix Corp
4730-00-542-4266SAE J513 4 010109B INTERCHANGEABLE
Plug,tube Fitting,threaded
Sae International Dba Sae International
5950-00-648-0428 INTERCHANGEABLE
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5935-00-789-246733-81 INTERCHANGEABLE
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Te Connectivity Corporation Dba Microdot Products
5998-00-828-9152 INTERCHANGEABLE
Circuit Card Assembly
6510-00-926-90823352 INTERCHANGEABLE
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Cross-Reference Index
Part NumberManufacturer
1356DPC19 Lawler Manufacturing Company, Inc. (USA)
3381 PRIMARY Lawler Manufacturing Company, Inc. (USA)
Related Parts
3110-00-100-0766INTERCHANGEABLE
CONE AND ROLLERS,TAPERED ROLLER
1B3963
5910-00-186-8412INTERCHANGEABLE
CAPACITOR,FIXED,PAPER DIELECTRIC
3-381
6105-00-284-0974INTERCHANGEABLE
ARMATURE,MOTOR
3-381
5950-00-318-2668INTERCHANGEABLE
TRANSFORMER,POWER
2910-00-373-1565INTERCHANGEABLE
FILTER,FLUID
33381
4730-00-542-4266INTERCHANGEABLE
PLUG,TUBE FITTING,THREADED
SAE J513 4 010109B
5950-00-648-0428INTERCHANGEABLE
TRANSFORMER,RADIO FREQUENCY
5935-00-789-2467INTERCHANGEABLE
CONNECTOR,PLUG,ELECTRICAL
33-81
5998-00-828-9152INTERCHANGEABLE
CIRCUIT CARD ASSEMBLY
6510-00-926-9082INTERCHANGEABLE
SPONGE,SURGICAL
3352
6140-01-070-7367INTERCHANGEABLE
BATTERY,STORAGE
405118-000
6505-01-127-8721INTERCHANGEABLE
AMILORIDE HYDROCHLORIDE TABLETS
3381

Frequently Asked Questions

What is NSN 4820-00-074-8012?

NSN 4820-00-074-8012 is a Seat,valve, manufactured by Lawler Manufacturing Company, Inc., classified under FSC 4820 (No Item Name Available). Status: active.

What are the part numbers for NSN 4820-00-074-8012?

NSN 4820-00-074-8012 has 2 cross-referenced part numbers: 1356DPC19 (Lawler Manufacturing Company, Inc.), 3381 (Lawler Manufacturing Company, Inc.).

What NSN replaces 4820-00-074-8012?

There are 12 known substitutes for 4820-00-074-8012: 3110-00-100-0766, 5910-00-186-8412, 6105-00-284-0974 and 9 more. Verify interchangeability with system specifications before substitution.

What are the specifications of 3381?

Key specifications for 3381: Nominal Thread Size: 1.625 INCHES SINGLE THREADED PORTION IN; Thread Series Designator: UNEF SINGLE THREADED PORTION; Thread Class: 2A SINGLE THREADED PORTION A; Flange Seat to Disk End Height: 0.375 INCHES NOMINAL IN. 12 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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