PartsTable TECHNICAL DATA SHEET
JULY 2026Technical Data Sheet

1648Seat,valve

Lawler Manufacturing Company, Inc. · NSN 4820-00-859-3789 · FSC 4820 · No Item Name Available
Verified by PartsTable
NSN 4820-00-859-3789 — this item is cataloged by the U.S. Government under National Stock Number 4820-00-859-3789. Primary manufacturer part number: 1648.
Features
  • Seat,valve — FSC 4820
  • Thread Quantity Per Inch: 18 SINGLE THREADED PORTION
  • Thread Series Designator: UNS SINGLE THREADED PORTION
  • Seat Angle in Deg: 32.000 NOMINAL
  • Thread Class: 2A SINGLE THREADED PORTION A
  • Material: STEEL OVERALL
  • Thread Length: 0.375 INCHES NOMINAL SINGLE THREADED PORTION IN
  • Style Designator: THREADED FLANGED
Applications
  • Flow control in piping systems
  • Pressure regulation
  • Steam and fluid isolation
  • Applications requiring Steel Overall construction
General Description

The Seat,valve, cataloged under National Stock Number 4820-00-859-3789, 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 13 verified specifications, sourced from the Federal Logistics Information System (FLIS). This item has 1 commercial cross-reference 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
NSN4820-00-859-3789
Primary Part Number1648
Item NameSeat,valve
FSC / FSG4820 / 48 — No Item Name Available
ManufacturerLawler Manufacturing Company, Inc.
StatusACTIVE
Thread Quantity Per Inch18 SINGLE THREADED PORTION
Thread Series DesignatorUNS SINGLE THREADED PORTION
Seat Angle in Deg32.000 NOMINAL
Thread Class2A SINGLE THREADED PORTION A
MaterialSTEEL OVERALL
Thread Length0.375 INCHES NOMINAL SINGLE THREADED PORTION IN
Style DesignatorTHREADED FLANGED
Seating Surface ShapeANGULAR
Flange Seat to Disk End Height0.375 INCHES NOMINAL IN
Body Inside Diameter1.500 INCHES NOMINAL IN
Under Flange Height2.500 INCHES NOMINAL IN
Flange Diameter2.125 INCHES NOMINAL IN
Nominal Thread Size1.875 INCHES SINGLE THREADED PORTION IN
Lifecycle & Compliance
Acquisition StatusACTIVE
HAZMATNo
Verified Substitutes 12
5310-00-021-97551045H INTERCHANGEABLE
Nut,plain,hexagon
Dorsey Trailers Inc
4820-00-172-83551648 INTERCHANGEABLE
Valve,safety Relief
Pneudraulics, Inc.
4310-00-173-52741648 INTERCHANGEABLE
Ring,piston
Quincy Compressor Division of Coltec Industries Inc Dba Quincy Compressor Div Quincy Compressor
8135-00-239-16481648 INTERCHANGEABLE
Tag,shipping
American Packaging I, Inc.
4730-00-391-37539A6033 INTERCHANGEABLE
Fitting,lubrication
Napco International Llc Dba Napco International Inc
4820-00-473-12991710 INTERCHANGEABLE
Valve,safety Relief
Pneudraulics, Inc.
5950-00-928-3254D0T48 INTERCHANGEABLE
Transformer,audio Frequency
Magnetika Inc
3441-00-982-1729 INTERCHANGEABLE
Press Brake,power Operated
5910-01-055-2737 INTERCHANGEABLE
Capacitor,fixed,plastic Dielectr
5935-01-196-7114 INTERCHANGEABLE
Clamp,cable,electrical Connector
Cross-Reference Index
Part NumberManufacturer
1648 PRIMARY Lawler Manufacturing Company, Inc. (USA)
Related Parts
5310-00-021-9755INTERCHANGEABLE
NUT,PLAIN,HEXAGON
1045H
4820-00-172-8355INTERCHANGEABLE
VALVE,SAFETY RELIEF
1648
4310-00-173-5274INTERCHANGEABLE
RING,PISTON
1648
8135-00-239-1648INTERCHANGEABLE
TAG,SHIPPING
1648
4730-00-391-3753INTERCHANGEABLE
FITTING,LUBRICATION
9A6033
4820-00-473-1299INTERCHANGEABLE
VALVE,SAFETY RELIEF
1710
5950-00-928-3254INTERCHANGEABLE
TRANSFORMER,AUDIO FREQUENCY
D0T48
3441-00-982-1729INTERCHANGEABLE
PRESS BRAKE,POWER OPERATED
5910-01-055-2737INTERCHANGEABLE
CAPACITOR,FIXED,PLASTIC DIELECTR
5935-01-196-7114INTERCHANGEABLE
CLAMP,CABLE,ELECTRICAL CONNECTOR
3810-01-498-0607INTERCHANGEABLE
CONNECTOR,ELECTRICAL,ROTARY
5616137
2540-01-576-6809INTERCHANGEABLE
LAV-R BALLISTIC INS
1648

Frequently Asked Questions

What is NSN 4820-00-859-3789?

NSN 4820-00-859-3789 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 4820-00-859-3789?

NSN 4820-00-859-3789 has 1 cross-referenced part number: 1648 (Lawler Manufacturing Company, Inc.).

What NSN replaces 4820-00-859-3789?

There are 12 known substitutes for 4820-00-859-3789: 5310-00-021-9755, 4820-00-172-8355, 4310-00-173-5274 and 9 more. Verify interchangeability with system specifications before substitution.

What are the specifications of 1648?

Key specifications for 1648: Thread Quantity Per Inch: 18 SINGLE THREADED PORTION; Thread Series Designator: UNS SINGLE THREADED PORTION; Seat Angle in Deg: 32.000 NOMINAL; Thread Class: 2A SINGLE THREADED PORTION A. 14 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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