PartsTable TECHNICAL DATA SHEET
JULY 2026Technical Data Sheet

923-01Diaphragm,valve,flat

Trac Regulator Co., Inc. Dba Trac Regulator Co Inc · NSN 4820-01-376-2749 · FSC 4820 · No Item Name Available
Verified by PartsTable
NSN 4820-01-376-2749 — this item is cataloged by the U.S. Government under National Stock Number 4820-01-376-2749. Primary manufacturer part number: 923-01.
Features
  • Diaphragm,valve,flat — FSC 4820
  • Center Hole Diameter: 0.250 INCHES NOMINAL IN
  • Bolt Hole Quantity: 8
  • Material: RUBBER
  • Bolt Circle Diameter: 4.312 INCHES NOMINAL IN
  • Media for Which Designed: WATER, SALT
  • Outside Diameter: 5.000 INCHES NOMINAL IN
  • Temp Rating: 250.0 FAHRENHEIT NOMINAL DEGF
Applications
  • Flow control in piping systems
  • Pressure regulation
  • Steam and fluid isolation
  • Applications requiring Rubber construction
General Description

The Diaphragm,valve,flat, cataloged under National Stock Number 4820-01-376-2749, 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. Government technical data includes 11 verified specifications, sourced from the Federal Logistics Information System (FLIS). This item has 4 commercial cross-references from 1 manufacturer, enabling identification through both NSN and commercial part number lookups. 11 verified substitutes exist in the FLIS interchangeability database. Current acquisition status: Active.

Technical Specifications
ParameterValue
NSN4820-01-376-2749
Primary Part Number923-01
Item NameDiaphragm,valve,flat
FSC / FSG4820 / 48 — No Item Name Available
ManufacturerTrac Regulator Co., Inc. Dba Trac Regulator Co Inc
StatusACTIVE
Center Hole Diameter0.250 INCHES NOMINAL IN
Bolt Hole Quantity8
MaterialRUBBER
Bolt Circle Diameter4.312 INCHES NOMINAL IN
Media for Which DesignedWATER, SALT
Outside Diameter5.000 INCHES NOMINAL IN
Temp Rating250.0 FAHRENHEIT NOMINAL DEGF
Hole Diameter0.312 INCHES NOMINAL IN
Material Thickness0.125 INCHES NOMINAL IN
Style DesignatorFLAT
Pressure Rating150.0 POUNDS PER SQUARE INCH (PSI) NOMINAL LBS
Lifecycle & Compliance
Acquisition StatusACTIVE
HAZMATNo
Verified Substitutes 11
3110-00-100-033712364377-2 INTERCHANGEABLE
Cup,tapered Roller Bearing
Rbc Aircraft Products, Inc.
5905-00-104-8350 INTERCHANGEABLE
Resistor,fixed,composition
7530-01-026-4702405069 INTERCHANGEABLE
Label
Telemechanics Inc
4820-01-175-1282937-00 INTERCHANGEABLE
Stem,fluid Valve
Trac Regulator Co., Inc. Dba Trac Regulator Co Inc
4920-01-300-197192301 INTERCHANGEABLE
Test Program Set
Textron Systems Corporation Dba Textron Systems Corp
4820-01-376-271240506-905 INTERCHANGEABLE
Valve,regulating,fluid Pressure
Trac Regulator Co., Inc. Dba Trac Regulator Co Inc
4820-01-376-2746931-01 INTERCHANGEABLE
Disk,valve
Trac Regulator Co., Inc. Dba Trac Regulator Co Inc
4820-01-377-939540506-902 INTERCHANGEABLE
Valve,regulating,fluid Pressure
Trac Regulator Co., Inc. Dba Trac Regulator Co Inc
2815-01-378-7483 INTERCHANGEABLE
Screw,adjusting,valve Tappet
5985-01-554-48099230-1 INTERCHANGEABLE
Antenna
A. T. Parker, Inc. Div Solar Electronics Company
Cross-Reference Index
Part NumberManufacturer
923 Trac Regulator Co., Inc. Dba Trac Regulator Co Inc (USA)
923-01 PRIMARY Trac Regulator Co., Inc. Dba Trac Regulator Co Inc (USA)
40506-9 ITEM 7 Trac Regulator Co., Inc. Dba Trac Regulator Co Inc (USA)
40506-9 Trac Regulator Co., Inc. Dba Trac Regulator Co Inc (USA)
Related Parts
3110-00-100-0337INTERCHANGEABLE
CUP,TAPERED ROLLER BEARING
12364377-2
5905-00-104-8350INTERCHANGEABLE
RESISTOR,FIXED,COMPOSITION
7530-01-026-4702INTERCHANGEABLE
LABEL
405069
4820-01-175-1282INTERCHANGEABLE
STEM,FLUID VALVE
937-00
4920-01-300-1971INTERCHANGEABLE
TEST PROGRAM SET
92301
4820-01-376-2712INTERCHANGEABLE
VALVE,REGULATING,FLUID PRESSURE
40506-905
4820-01-376-2746INTERCHANGEABLE
DISK,VALVE
931-01
4820-01-377-9395INTERCHANGEABLE
VALVE,REGULATING,FLUID PRESSURE
40506-902
2815-01-378-7483INTERCHANGEABLE
SCREW,ADJUSTING,VALVE TAPPET
5985-01-554-4809INTERCHANGEABLE
ANTENNA
9230-1
3750-01-615-8542INTERCHANGEABLE
RAKE,GARDEN
370000401N

Frequently Asked Questions

What is NSN 4820-01-376-2749?

NSN 4820-01-376-2749 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 4820-01-376-2749?

NSN 4820-01-376-2749 has 4 cross-referenced part numbers: 923 (Trac Regulator Co., Inc. Dba Trac Regulator Co Inc), 923-01 (Trac Regulator Co., Inc. Dba Trac Regulator Co Inc), 40506-9 ITEM 7 (Trac Regulator Co., Inc. Dba Trac Regulator Co Inc), 40506-9 (Trac Regulator Co., Inc. Dba Trac Regulator Co Inc).

What NSN replaces 4820-01-376-2749?

There are 11 known substitutes for 4820-01-376-2749: 3110-00-100-0337, 5905-00-104-8350, 7530-01-026-4702 and 8 more. Verify interchangeability with system specifications before substitution.

What are the specifications of 923-01?

Key specifications for 923-01: Center Hole Diameter: 0.250 INCHES NOMINAL IN; Bolt Hole Quantity: 8; Special Features: VALVE SIZE 0.250IN; STYL H IN; Material: RUBBER. 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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