General Characteristics Item Description: SOLE SOURCE REQUIRED BY STATUTE 6.302
Criticality Code Justification: TEXT
Identification
NSN: 4240-01-251-3281
NIIN: 012513281
FSC: 4240 — Safety and Rescue Equipment
FSG: 42 — Fire Fighting, Rescue, and Safety Equipment
General Description
The Cover,respirator, cataloged under National Stock Number 4240-01-251-3281, is classified within Federal Supply Class 4240 (Safety and Rescue Equipment) of the Fire Fighting, Rescue, and Safety Equipment group. Government technical data includes 2 specifications, cited from the U.S. Government catalog. 3 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 5 items share a part number with this NSN in the catalog (possible match — not a government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
4240-01-251-3281
Item Name
Cover,respirator
FSC / FSG
4240 / 42 — Safety and Rescue Equipment
Status
ACTIVE
General Characteristics Item Description
SOLE SOURCE REQUIRED BY STATUTE 6.302
Criticality Code Justification
TEXT
Lifecycle & Compliance
Acquisition Status
ACTIVE
DEMIL Code
DEMIL A — No Demilitarization Required
Hazard
Possible hazard — SDS may be required (DLA HMIC P)
Criticality Code
Y
⇄Related Items5
Each row states its source: a government interchangeability/replacement code, or a possible match on a shared part number.
2530-01-331-2992POSSIBLE MATCH
BRAKE LINING KIT
Possible match (shared part number)
4320-01-461-811314796N18POSSIBLE MATCH
RING,WEARING
Possible match (shared part number)Curtiss-Wright Electro-Mechanical Corporation Div Epd
4720-01-481-81185155-6POSSIBLE MATCH
HOSE,NONMETALLIC
Possible match (shared part number)Parker-Hannifin Corporation Dba Pneutronics Div Hose Products Division
7310-01-583-135351556POSSIBLE MATCH
RIGHT HAND INNER DOOR GLASS ASSY
Possible match (shared part number)G.s. Blodgett, Llc Div Blodgett
8345-01-590-3014POSSIBLE MATCH
FLAG,US ARMY DENTAC
Possible match (shared part number)
Cross-Reference Index
No manufacturer part numbers on file in the U.S. Government catalog.
Reference documents
Reference
Meaning
51556
3/9Design control — primary reference
Aearo Company 1 Dba Aearo Div Ao Safety Occupational Prescription Eyewear
51556
5/9Secondary reference
U.S. Government activity
51556
5/9Secondary reference
3m Company
Related Parts
2530-01-331-2992POSSIBLE MATCH
BRAKE LINING KIT
4320-01-461-8113POSSIBLE MATCH
RING,WEARING
14796N18
4720-01-481-8118POSSIBLE MATCH
HOSE,NONMETALLIC
5155-6
7310-01-583-1353POSSIBLE MATCH
RIGHT HAND INNER DOOR GLASS ASSY
51556
8345-01-590-3014POSSIBLE MATCH
FLAG,US ARMY DENTAC
Frequently Asked Questions
What is NSN 4240-01-251-3281?
NSN 4240-01-251-3281 is a Cover,respirator, classified under FSC 4240, Safety and Rescue Equipment. Status: active.
What NSN replaces 4240-01-251-3281?
5 possible matches (shared part number, not a government interchangeability claim): 2530-01-331-2992, 4320-01-461-8113, 4720-01-481-8118. Verify interchangeability with system specifications before substitution.
What are the specifications of 4240-01-251-3281?
Key specifications for 4240-01-251-3281: General Characteristics Item Description: SOLE SOURCE REQUIRED BY STATUTE 6.302; Criticality Code Justification: TEXT; End Item Identification: AMERICAN OPTICAL MODEL 7 STAR S7700 SERIES RESPIRATOR. 2 specifications are documented in the U.S. Government catalog.
Is NSN 4240-01-251-3281 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.