PartsTable TECHNICAL DATA SHEET
JULY 2026Technical Data Sheet

657-02Diaphragm,valve,flat

Trac Regulator Co., Inc. Dba Trac Regulator Co Inc · NSN 4820-01-233-4946 · FSC 4820 · No Item Name Available
Verified by PartsTable
NSN 4820-01-233-4946 — this item is cataloged by the U.S. Government under National Stock Number 4820-01-233-4946. Primary manufacturer part number: 657-02.
Features
  • Diaphragm,valve,flat — FSC 4820
  • 2 verified cross-references
  • Primary manufacturer: Trac Regulator Co., Inc. Dba Trac Regulator Co Inc
Applications
  • Flow control in piping systems
  • Pressure regulation
  • Steam and fluid isolation
General Description

The Diaphragm,valve,flat, cataloged under National Stock Number 4820-01-233-4946, is classified within Federal Supply Class 4820 (No Item Name Available) of the Valves group. The primary manufacturer of record is Trac Regulator Co., Inc. Dba Trac Regulator Co Inc. This item has 2 commercial cross-references from 1 manufacturer, enabling identification through both NSN and commercial part number lookups. 2 verified substitutes exist in the FLIS interchangeability database. Current acquisition status: Active.

Catalog Facts
Item NameDiaphragm,valve,flat
FSC / FSG4820 — No Item Name Available (FSG 48)
ManufacturersTrac Regulator Co., Inc. Dba Trac Regulator Co Inc (CAGE 55378)
Technical Specifications
ParameterValue
NSN4820-01-233-4946
Primary Part Number657-02
Item NameDiaphragm,valve,flat
FSC / FSG4820 / 48 — No Item Name Available
ManufacturerTrac Regulator Co., Inc. Dba Trac Regulator Co Inc
StatusACTIVE
Lifecycle & Compliance
Acquisition StatusACTIVE
HAZMATNo
Verified Substitutes 2
5998-00-403-852965702 INTERCHANGEABLE
Circuit Card Assembly
Scientific Atlanta Inc
1005-01-166-194265702 INTERCHANGEABLE
Cover
Moog Inc.
Cross-Reference Index
Part NumberManufacturer
657-02 PRIMARY Trac Regulator Co., Inc. Dba Trac Regulator Co Inc (USA)
40478-1 PIECE 17 Trac Regulator Co., Inc. Dba Trac Regulator Co Inc (USA)
Related Parts
5998-00-403-8529INTERCHANGEABLE
CIRCUIT CARD ASSEMBLY
65702
1005-01-166-1942INTERCHANGEABLE
COVER
65702

Frequently Asked Questions

What is NSN 4820-01-233-4946?

NSN 4820-01-233-4946 is a Diaphragm,valve,flat, manufactured by Trac Regulator Co., Inc. Dba Trac Regulator Co Inc, classified under FSC 4820 (No Item Name Available). Status: active.

What are the part numbers for NSN 4820-01-233-4946?

NSN 4820-01-233-4946 has 2 cross-referenced part numbers: 657-02 (Trac Regulator Co., Inc. Dba Trac Regulator Co Inc), 40478-1 PIECE 17 (Trac Regulator Co., Inc. Dba Trac Regulator Co Inc).

What NSN replaces 4820-01-233-4946?

There are 2 known substitutes for 4820-01-233-4946: 5998-00-403-8529, 1005-01-166-1942. Verify interchangeability with system specifications before substitution.

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