PartsTable TECHNICAL DATA SHEET
JULY 2026Technical Data Sheet

A-04Head,diaphragm

Bay State Controls Corporation · NSN 4820-01-387-5702 · FSC 4820 · No Item Name Available
Verified by PartsTable
NSN 4820-01-387-5702 — this item is cataloged by the U.S. Government under National Stock Number 4820-01-387-5702. Primary manufacturer part number: A-04.
Features
  • Head,diaphragm — FSC 4820
  • General Characteristics Item Description: ALUMINUM
  • 1 verified cross-reference
  • Primary manufacturer: Bay State Controls Corporation
Applications
  • Flow control in piping systems
  • Water treatment infrastructure
  • Industrial process control
General Description

The Head,diaphragm, cataloged under National Stock Number 4820-01-387-5702, is classified within Federal Supply Class 4820 (No Item Name Available) of the Valves group. The primary manufacturer of record is Bay State Controls Corporation. Government technical data includes 1 verified specification, 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. 1 verified substitute exists in the FLIS interchangeability database. Current acquisition status: Active.

Technical Specifications
ParameterValue
NSN4820-01-387-5702
Primary Part NumberA-04
Item NameHead,diaphragm
FSC / FSG4820 / 48 — No Item Name Available
ManufacturerBay State Controls Corporation
StatusACTIVE
General Characteristics Item DescriptionALUMINUM
Lifecycle & Compliance
Acquisition StatusACTIVE
HAZMATNo
Verified Substitutes 1
6685-00-682-74591-4 1112BG INTERCHANGEABLE
Dampener,fluid Pressure
Ashcroft Inc Dba Heise
Cross-Reference Index
Part NumberManufacturer
A-04 Bay State Controls Corporation (USA)
Related Parts
6685-00-682-7459INTERCHANGEABLE
DAMPENER,FLUID PRESSURE
1-4 1112BG

Frequently Asked Questions

What is NSN 4820-01-387-5702?

NSN 4820-01-387-5702 is a Head,diaphragm, manufactured by Bay State Controls Corporation, classified under FSC 4820 (No Item Name Available). Status: active.

What are the part numbers for NSN 4820-01-387-5702?

NSN 4820-01-387-5702 has 1 cross-referenced part number: A-04 (Bay State Controls Corporation).

What NSN replaces 4820-01-387-5702?

There is 1 known substitute for 4820-01-387-5702: 6685-00-682-7459. Verify interchangeability with system specifications before substitution.

What are the specifications of A-04?

Key specifications for A-04: General Characteristics Item Description: ALUMINUM. 1 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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