NSN 4820-00-657-1523 — this item is cataloged by the U.S. Government under National Stock Number 4820-00-657-1523. Manufacturer of record part number: 1625.
Also searched as4820-00-657-1523 ·
4820006571523 ·
NIIN 006571523 ·
00-657-1523 ·
FSC 4820 Valves, Nonpowered · CAGE 75545 · 1625
Flange Seat to Disk End Height: 0.406 INCHES NOMINAL IN
Flange Diameter: 1.375 INCHES NOMINAL IN
Body Stepped Inside Diameter: 0.875 INCHES MINIMUM AND 0.880 INCHES MAXIMUM FIRST STEP IN
Body Stepped Inside Diameter: 1.000 INCHES NOMINAL SECOND STEP IN
Style Designator: THREADED FLANGED
Under Flange Height: 0.375 INCHES NOMINAL IN
Material: STEEL OVERALL
Identification
NSN: 4820-00-657-1523
NIIN: 006571523
FSC: 4820 — Valves, Nonpowered
FSG: 48 — Valves
Primary part number: 1625
Manufacturer: Lawler Manufacturing Company, Inc.
General Description
The Seat,valve, cataloged under National Stock Number 4820-00-657-1523, is classified within Federal Supply Class 4820 (Valves, Nonpowered) of the Valves group. The manufacturer of record is Lawler Manufacturing Company, Inc.. Government technical data includes 8 specifications, cited from the U.S. Government catalog. The record lists 1 manufacturer part number for this item, enabling identification through both NSN and commercial part number lookups. Current acquisition status: Active.
Technical Specifications
Parameter
Value
NSN
4820-00-657-1523
Primary Part Number
1625
Item Name
Seat,valve
FSC / FSG
4820 / 48 — Valves, Nonpowered
Manufacturer
Lawler Manufacturing Company, Inc.
Status
ACTIVE
Flange Seat to Disk End Height
0.406 INCHES NOMINAL IN
Flange Diameter
1.375 INCHES NOMINAL IN
Body Stepped Inside Diameter
0.875 INCHES MINIMUM AND 0.880 INCHES MAXIMUM FIRST STEP IN
Items in the same Federal Supply class. No interchangeability or substitution relationship is implied.
4820-00-000-0097
4820-00-000-0097 · Item name not on file
4820-00-001-0010
VALVE,ROTARY,SELECTOR
4820-00-001-0020
4820-00-001-0020 · Item name not on file
4820-00-001-0021
4820-00-001-0021 · Item name not on file
4820-00-001-0032
4820-00-001-0032 · Item name not on file
4820-00-001-0037
VALVE,SAFETY RELIEF
4820-00-001-0042
4820-00-001-0042 · Item name not on file
4820-00-001-1230
4820-00-001-1230 · Item name not on file
Frequently Asked Questions
What is NSN 4820-00-657-1523?
NSN 4820-00-657-1523 is a Seat,valve, manufactured by Lawler Manufacturing Company, Inc., classified under FSC 4820, Valves, Nonpowered. Status: active.
What part numbers are listed for NSN 4820-00-657-1523?
NSN 4820-00-657-1523 has 1 manufacturer part number on file: 1625 (Lawler Manufacturing Company, Inc.).
What are the specifications of 1625?
Key specifications for 1625: Flange Seat to Disk End Height: 0.406 INCHES NOMINAL IN; Flange Diameter: 1.375 INCHES NOMINAL IN; Body Stepped Inside Diameter: 0.875 INCHES MINIMUM AND 0.880 INCHES MAXIMUM FIRST STEP IN; Body Stepped Inside Diameter: 1.000 INCHES NOMINAL SECOND STEP IN. 8 specifications are documented in the U.S. Government catalog.
Is NSN 4820-00-657-1523 hazardous material?
No hazard code in the DLA record (HMIC N). Hazard information on this page is shown exactly as it appears in the DLA record.
Sources
U.S. Government catalog: edition PUBLOGDVD v12.0.0 (OCT 2026), edition date 2026-10-01, retrieved 2026-10-16.
U.S. Government catalog: edition PUBLOGDVD v12.0.0 (OCT 2026), edition date 2026-10-01, retrieved 2026-10-18.
✓ Data cited from the U.S. Government catalog; commercial cross-references from OEM and certified industry sources.