The Retainer-Lens,oxygen Mask, cataloged under National Stock Number 1660-01-068-0638, is classified within Federal Supply Class 1660 (Aircraft Air Conditioning, Heating, and Pressurizing Equipment) of the Aircraft Components and Accessories group. The manufacturer of record is Avox Systems Inc Dba Avox Systems Inc. Government technical data includes 2 specifications, cited from the U.S. Government catalog. The record lists 1 manufacturer part number for this item, enabling identification through both NSN and commercial part number lookups. 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 | 1660-01-068-0638 |
| Primary Part Number | 651-04 |
| Item Name | Retainer-Lens,oxygen Mask |
| FSC / FSG | 1660 / 16 — Aircraft Air Conditioning, Heating, and Pressurizing Equipment |
| Manufacturer | Avox Systems Inc Dba Avox Systems Inc |
| Status | ACTIVE |
| FSC Application Data | OXYGEN BREATHING SYSTEM,AIRCRAFT |
| General Characteristics Item Description | ALUMINUM ALLOY,A-38O,QQ-A-591B; 9.493 IN. LG; 2.875 IN. W. IN |
| Acquisition Status | ACTIVE |
| DEMIL Code | DEMIL A — No Demilitarization Required |
| Hazard | No hazard code in the DLA record (HMIC N) |
| Criticality Code | X |
| Part Number | Manufacturer |
|---|---|
| 651-04 PRIMARY | Avox Systems Inc Dba Avox Systems Inc (USA) |
NSN 1660-01-068-0638 is a Retainer-Lens,oxygen Mask, manufactured by Avox Systems Inc Dba Avox Systems Inc, classified under FSC 1660, Aircraft Air Conditioning, Heating, and Pressurizing Equipment. Status: active.
NSN 1660-01-068-0638 has 1 manufacturer part number on file: 651-04 (Avox Systems Inc Dba Avox Systems Inc).
1 possible match (shared part number, not a government interchangeability claim): 5315-01-436-3751. Verify interchangeability with system specifications before substitution.
Key specifications for 651-04: FSC Application Data: OXYGEN BREATHING SYSTEM,AIRCRAFT; General Characteristics Item Description: ALUMINUM ALLOY,A-38O,QQ-A-591B; 9.493 IN. LG; 2.875 IN. W. IN; End Item Identification: P/N 651-475-1 OXYGEN MASK. 2 specifications are documented in the U.S. Government catalog.
No hazard code in the DLA record (HMIC N). 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.