FSG: 42 — Fire Fighting, Rescue, and Safety Equipment
General Description
The Mask,gas, cataloged under National Stock Number 4240-01-651-4164, 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1 specification, cited from the U.S. Government catalog. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog. Current acquisition status: Active.
Technical Specifications
Parameter
Value
NSN
4240-01-651-4164
Item Name
Mask,gas
FSC / FSG
4240 / 42 — Safety and Rescue Equipment
Status
ACTIVE
Facepiece Design
FULL
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
Cross-Reference Index
No manufacturer part numbers on file in the U.S. Government catalog.
Reference documents
Reference
Meaning
10161811
3/9Design control — primary reference
Mine Safety Appliances Company, Llc Dba M S a
No interchangeability data on file.
Other items in FSC 4240 — Safety and Rescue Equipment
Items in the same Federal Supply class. No interchangeability or substitution relationship is implied.
4240-00-001-1515
4240-00-001-1515 · Item name not on file
4240-00-001-2684
4240-00-001-2684 · Item name not on file
4240-00-006-0022
HOSE,EVACUATION
4240-00-007-4576
4240-00-007-4576 · Item name not on file
4240-00-007-8182
4240-00-007-8182 · Item name not on file
4240-00-007-8183
4240-00-007-8183 · Item name not on file
4240-00-007-8184
4240-00-007-8184 · Item name not on file
4240-00-007-8185
4240-00-007-8185 · Item name not on file
Frequently Asked Questions
What is NSN 4240-01-651-4164?
NSN 4240-01-651-4164 is a Mask,gas, classified under FSC 4240, Safety and Rescue Equipment. Status: active.
What are the specifications of 4240-01-651-4164?
Key specifications for 4240-01-651-4164: Facepiece Design: FULL; Special Features: APPLICATION FIRE; NOSECUP SIZE LARGE; 4-PT KEVLAR ADJUSTABLE HEAD HARNESS; CLOTH NECK STRAP; Part Name Assigned by Controlling Agency: G1 FACEPIECE. 1 specification is documented in the U.S. Government catalog.
Is NSN 4240-01-651-4164 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.