The Lens,cover, cataloged under National Stock Number 4240-01-052-9901, 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 Mine Safety Appliances Company. Government technical data includes 1 specification, 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through both NSN and commercial part number lookups. 3 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 4240-01-052-9901 |
| Primary Part Number | 456975 |
| Item Name | Lens,cover |
| FSC / FSG | 4240 / 42 — Safety and Rescue Equipment |
| Manufacturer | Mine Safety Appliances Company |
| Status | ACTIVE |
| General Characteristics Item Description | CLEAR; CELLULOSE ACETATE; 7-3/4 IN. LG,3-7/8 IN. W IN |
| 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 |
|---|---|
| 456975 PRIMARY | Mine Safety Appliances Company (USA) |
| Reference | Meaning |
|---|---|
| B2-06-6000-67-0 | 5/9 Secondary reference Biomarine Inc |
| 639320-02 FIND 11 | 5/9 Secondary reference Naval Sea Systems Command |
| 639320-01 FIND 10 | 5/9 Secondary reference Naval Sea Systems Command |
NSN 4240-01-052-9901 is a Lens,cover, manufactured by Mine Safety Appliances Company, classified under FSC 4240, Safety and Rescue Equipment. Status: active.
NSN 4240-01-052-9901 has 1 manufacturer part number on file: 456975 (Mine Safety Appliances Company).
Key specifications for 456975: General Characteristics Item Description: CLEAR; CELLULOSE ACETATE; 7-3/4 IN. LG,3-7/8 IN. W IN; End Item Identification: MINE SAFETY APPLIANCES ULTRAVUE FACEPIECE. 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.