PartsTable TECHNICAL DATA SHEET
JULY 2026Technical Data Sheet

S4500Respirator,air Filtering

3m Company · NSN 4240-01-251-1574 · FSC 4240 · No Item Name Available
Verified by PartsTable
NSN 4240-01-251-1574 — this item is cataloged by the U.S. Government under National Stock Number 4240-01-251-1574. Primary manufacturer part number: S4500.
Features
  • Respirator,air Filtering — FSC 4240
  • Filter Type: CARTRIDGE AND FILTER PAD
  • Mask Filter Quantity: 2
  • Material Type: ELASTIC
  • Criticality Code Justification: FEAT
  • Head Harness: INCLUDED
  • Material: RUBBER SILICONE CLASS Q MASK
  • Mask Type: HALF FACEPIECE
Applications
  • Applications requiring Rubber Silicone Class Q Mask construction
General Description

The Respirator,air Filtering, cataloged under National Stock Number 4240-01-251-1574, is classified within Federal Supply Class 4240 (No Item Name Available) of the Fire Fighting, Rescue, and Safety Equipment group. The primary manufacturer of record is 3m Company. Government technical data includes 10 verified specifications, sourced from the Federal Logistics Information System (FLIS). This item has 6 commercial cross-references from 4 manufacturers, enabling identification through both NSN and commercial part number lookups. 7 verified substitutes exist in the FLIS interchangeability database. Current acquisition status: Active.

Technical Specifications
ParameterValue
NSN4240-01-251-1574
Primary Part NumberS4500
Item NameRespirator,air Filtering
FSC / FSG4240 / 42 — No Item Name Available
Manufacturer3m Company
StatusACTIVE
Filter TypeCARTRIDGE AND FILTER PAD
Mask Filter Quantity2
Material TypeELASTIC
Criticality Code JustificationFEAT
Head HarnessINCLUDED
MaterialRUBBER SILICONE CLASS Q MASK
Mask TypeHALF FACEPIECE
AdjustabilityADJUSTABLE
Exhaust ValveINCLUDED
Filter ReplaceabilityREPLACEABLE
Lifecycle & Compliance
Acquisition StatusACTIVE
HAZMATNo
Verified Substitutes 7
5360-00-383-3187 INTERCHANGEABLE
Spring,helical,compression
3120-00-771-6618 INTERCHANGEABLE
Bearing,washer,thrust
5120-01-004-168750445 INTERCHANGEABLE
Removal Tool
Ducommun Labarge Technologies, Inc Dba Ducommun Labarge Technologies, Inc
2930-01-044-90638445 INTERCHANGEABLE
Pump,coolant,engine
Elgin Industries Inc. Dba
4520-01-331-656650445 INTERCHANGEABLE
Heating Element,electrical,nonim
Indeeco Llc Dba Indeeco
7025-01-497-1764S4500 INTERCHANGEABLE
Printer,automatic Data Processin
National Instruments Corp
3950-01-527-6019S4500 INTERCHANGEABLE
Winch,drum,power Operated
Superwinch, Llc
Cross-Reference Index
Part NumberManufacturer
S4500 3m Company (USA)
50445 Aearo Company (USA)
S4500 Aearo Company (USA)
S4500 Aearo Company 1 Dba Aearo Div Ao Safety Occupational Prescription Eyewear (USA)
50445 American Optical Co (USA)
S4500 American Optical Co (USA)
Related Parts
5360-00-383-3187INTERCHANGEABLE
SPRING,HELICAL,COMPRESSION
3120-00-771-6618INTERCHANGEABLE
BEARING,WASHER,THRUST
5120-01-004-1687INTERCHANGEABLE
REMOVAL TOOL
50445
2930-01-044-9063INTERCHANGEABLE
PUMP,COOLANT,ENGINE
8445
4520-01-331-6566INTERCHANGEABLE
HEATING ELEMENT,ELECTRICAL,NONIM
50445
7025-01-497-1764INTERCHANGEABLE
PRINTER,AUTOMATIC DATA PROCESSIN
S4500
3950-01-527-6019INTERCHANGEABLE
WINCH,DRUM,POWER OPERATED
S4500

Frequently Asked Questions

What is NSN 4240-01-251-1574?

NSN 4240-01-251-1574 is a Respirator,air Filtering, manufactured by 3m Company, classified under FSC 4240 (No Item Name Available). Status: active.

What are the part numbers for NSN 4240-01-251-1574?

NSN 4240-01-251-1574 has 6 cross-referenced part numbers: S4500 (3m Company), 50445 (Aearo Company), S4500 (Aearo Company), S4500 (Aearo Company 1 Dba Aearo Div Ao Safety Occupational Prescription Eyewear), 50445 (American Optical Co) and 1 more.

What NSN replaces 4240-01-251-1574?

There are 7 known substitutes for 4240-01-251-1574: 5360-00-383-3187, 3120-00-771-6618, 5120-01-004-1687 and 4 more. Verify interchangeability with system specifications before substitution.

What are the specifications of S4500?

Key specifications for S4500: Filter Type: CARTRIDGE AND FILTER PAD; Mask Filter Quantity: 2; Material Type: ELASTIC; Criticality Code Justification: FEAT. 11 total characteristics are documented in the Federal Logistics Information System.

Validated with multiple authoritative sources, including Government, OEM, and Certified sources.
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