General Characteristics Item Description: SPRING STEEL,0.063 IN. DIA IN
Identification
NSN: 4240-00-300-6963
NIIN: 003006963
FSC: 4240 — Safety and Rescue Equipment
FSG: 42 — Fire Fighting, Rescue, and Safety Equipment
General Description
The Clamp,speaking Diaphragm, cataloged under National Stock Number 4240-00-300-6963, is classified within Federal Supply Class 4240 (Safety and Rescue Equipment) of the Fire Fighting, Rescue, and Safety Equipment group. Government technical data includes 1 specification, cited from the U.S. Government catalog. 2 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 8 items share a part number with this NSN in the catalog (possible match — not a government interchangeability claim). Current acquisition status: Active.
Technical Specifications
Parameter
Value
NSN
4240-00-300-6963
Item Name
Clamp,speaking Diaphragm
FSC / FSG
4240 / 42 — Safety and Rescue Equipment
Status
ACTIVE
General Characteristics Item Description
SPRING STEEL,0.063 IN. DIA IN
Lifecycle & Compliance
Acquisition Status
ACTIVE
DEMIL Code
DEMIL A — No Demilitarization Required
Hazard
Possible hazard — SDS may be required (DLA HMIC P)
Criticality Code
X
⇄Related Items8
Each row states its source: a government interchangeability/replacement code, or a possible match on a shared part number.
6130-00-392-5811SCD19447POSSIBLE MATCH
GUARD
Possible match (shared part number)Us Army Communications & Electronics Materiel Readiness Command Logistics Engineering Dir
6930-00-480-302040470POSSIBLE MATCH
DRUM ASSY,NUMBER 4
Possible match (shared part number)Curtiss-Wright Controls, Inc. Dba Curtiss Wright Div Actuation Division
8125-00-782-40008125007824000POSSIBLE MATCH
BOTTLE,APPLICATOR
Possible match (shared part number)General Services Administration Federal Supply Service
5950-01-181-457240470POSSIBLE MATCH
TRANSFORMER,RADIO FREQUENCY
Possible match (shared part number)University of Washington Div Applied Physics Laboratory
5360-01-195-831040-470POSSIBLE MATCH
SPRING,HELICAL,COMPRESSION
Possible match (shared part number)Goodrich Corporation Div Collins Aerospace, Landing Systems (wheels & Brakes)
6505-01-223-853640470POSSIBLE MATCH
CYANOCOBALAMIN TABLETS
Possible match (shared part number)Goldline Laboratories, Inc. Dba Goldline Laboratories
5998-01-642-185240470POSSIBLE MATCH
CIRCUIT CARD ASSEMBLY
Possible match (shared part number)The Connectivity Center, Inc.
4820-01-671-331840470POSSIBLE MATCH
STEM,FLUID VALVE
Possible match (shared part number)Hutchinson Industries, Inc Div Defense and Industry
Cross-Reference Index
No manufacturer part numbers on file in the U.S. Government catalog.
Reference documents
Reference
Meaning
40470
5/9Secondary reference
Mine Safety Appliances Company
S9300-921873PC131
3/2Design control — primary reference
U.S. Government activity
Related Parts
6130-00-392-5811POSSIBLE MATCH
GUARD
SCD19447
6930-00-480-3020POSSIBLE MATCH
DRUM ASSY,NUMBER 4
40470
8125-00-782-4000POSSIBLE MATCH
BOTTLE,APPLICATOR
8125007824000
5950-01-181-4572POSSIBLE MATCH
TRANSFORMER,RADIO FREQUENCY
40470
5360-01-195-8310POSSIBLE MATCH
SPRING,HELICAL,COMPRESSION
40-470
6505-01-223-8536POSSIBLE MATCH
CYANOCOBALAMIN TABLETS
40470
5998-01-642-1852POSSIBLE MATCH
CIRCUIT CARD ASSEMBLY
40470
4820-01-671-3318POSSIBLE MATCH
STEM,FLUID VALVE
40470
Frequently Asked Questions
What is NSN 4240-00-300-6963?
NSN 4240-00-300-6963 is a Clamp,speaking Diaphragm, classified under FSC 4240, Safety and Rescue Equipment. Status: active.
What NSN replaces 4240-00-300-6963?
8 possible matches (shared part number, not a government interchangeability claim): 6130-00-392-5811, 6930-00-480-3020, 8125-00-782-4000. Verify interchangeability with system specifications before substitution.
What are the specifications of 4240-00-300-6963?
Key specifications for 4240-00-300-6963: General Characteristics Item Description: SPRING STEEL,0.063 IN. DIA IN; End Item Identification: OXYGEN BREATHING APPARATUS,NAVY TYPE A-3. 1 specification is documented in the U.S. Government catalog.
Is NSN 4240-00-300-6963 hazardous material?
Possible hazard — SDS may be required (DLA HMIC P). 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.