The Seal,dome, cataloged under National Stock Number 4240-00-979-4040, is classified within Federal Supply Class 4240 (Safety and Rescue Equipment) of the Fire Fighting, Rescue, and Safety Equipment group. The manufacturer of record is Sae International Dba Sae International. Government technical data includes 1 specification, cited from the U.S. Government catalog. The record lists 2 manufacturer part numbers for this item, enabling identification through both NSN and commercial part number lookups. 7 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 1 item shares a part number with this NSN in the catalog (possible match — not a government interchangeability claim). Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 4240-00-979-4040 |
| Primary Part Number | QPL-AS23899-1 NOT 1 |
| Item Name | Seal,dome |
| FSC / FSG | 4240 / 42 — Safety and Rescue Equipment |
| Manufacturer | Sae International Dba Sae International |
| Status | ACTIVE |
| General Characteristics Item Description | REPLACEMENT SEAL,AURAL PROTECTOR,O-SHAPED,VINYLFILM COVER OVER POLYURETHANE,FURNISHED IN PAIRS ADAPTABLE TO HEARING PROTECTORS |
| Acquisition Status | ACTIVE |
| DEMIL Code | DEMIL A — No Demilitarization Required |
| Hazard | Possible hazard — SDS may be required (DLA HMIC P) |
| Criticality Code | X |
| Part Number | Manufacturer |
|---|---|
| QPL-AS23899-1 NOT 1 PRIMARY | Sae International Dba Sae International (USA) |
| 10253A PRIMARY | Astrocom Electronics Inc (USA) |
| Reference | Meaning |
|---|---|
| MIL-A-23899 | 5/9 Secondary reference U.S. Government activity |
| 12192G-09 | 5/9 Secondary reference David Clark Co Inc Div David Clark Company, Inc. |
| SP2014 | 5/9 Secondary reference U.S. Government activity |
| SP2014 | 5/9 Secondary reference David Clark Co Inc Div David Clark Company, Inc. |
| SAE-AS23899 | 3/1 Design control — primary reference Sae International Dba Sae International |
| QPL-AS23899-1 NOT 1 | 5/9 Secondary reference U.S. Government activity |
| SAE-AS23899 | 5/9 Secondary reference U.S. Government activity |
NSN 4240-00-979-4040 is a Seal,dome, manufactured by Sae International Dba Sae International, classified under FSC 4240, Safety and Rescue Equipment. Status: active.
NSN 4240-00-979-4040 has 2 manufacturer part numbers on file: QPL-AS23899-1 NOT 1 (Sae International Dba Sae International), 10253A (Astrocom Electronics Inc).
1 possible match (shared part number, not a government interchangeability claim): 5330-01-294-8484. Verify interchangeability with system specifications before substitution.
Key specifications for QPL-AS23899-1 NOT 1: General Characteristics Item Description: REPLACEMENT SEAL,AURAL PROTECTOR,O-SHAPED,VINYLFILM COVER OVER POLYURETHANE,FURNISHED IN PAIRS ADAPTABLE TO HEARING PROTECTORS. 1 specification is documented in the U.S. Government catalog.
Possible hazard — SDS may be required (DLA HMIC P). Hazard information on this page is shown exactly as it appears in the DLA record.
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.