PartsTable TECHNICAL DATA SHEET
JULY 2026Technical Data Sheet

S5500Respirator,air Filtering

3m Company · NSN 4240-01-251-1577 · FSC 4240 · No Item Name Available
Verified by PartsTable
NSN 4240-01-251-1577 — this item is cataloged by the U.S. Government under National Stock Number 4240-01-251-1577. Primary manufacturer part number: S5500.
Features
  • Respirator,air Filtering — FSC 4240
  • Adjustability: ADJUSTABLE
  • Exhaust Valve: INCLUDED
  • Filter Type: CARTRIDGE AND FILTER PAD
  • Material Type: ELASTIC
  • Mask Filter Quantity: 2
  • Filter Replaceability: REPLACEABLE
  • Mask Type: HALF FACEPIECE
Applications
  • Applications requiring Rubber Silicone Class Q Mask construction
General Description

The Respirator,air Filtering, cataloged under National Stock Number 4240-01-251-1577, 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. 12 verified substitutes exist in the FLIS interchangeability database. Current acquisition status: Active.

Technical Specifications
ParameterValue
NSN4240-01-251-1577
Primary Part NumberS5500
Item NameRespirator,air Filtering
FSC / FSG4240 / 42 — No Item Name Available
Manufacturer3m Company
StatusACTIVE
AdjustabilityADJUSTABLE
Exhaust ValveINCLUDED
Filter TypeCARTRIDGE AND FILTER PAD
Material TypeELASTIC
Mask Filter Quantity2
Filter ReplaceabilityREPLACEABLE
Mask TypeHALF FACEPIECE
Criticality Code JustificationFEAT
Head HarnessINCLUDED
MaterialRUBBER SILICONE CLASS Q MASK
Lifecycle & Compliance
Acquisition StatusACTIVE
HAZMATNo
Verified Substitutes 12
5950-00-118-288450099 INTERCHANGEABLE
Transformer,radio Frequency
Creating Technology Solutions, Llc Dba Technology Research Corp Div Technology Research Corp
6810-00-281-6934 INTERCHANGEABLE
Sucrose
5330-00-292-1593102039 INTERCHANGEABLE
Seal,plain Encased
Aqua-Chem, Inc. Dba Aqua-Chem Inc
4210-00-394-3209S2500 INTERCHANGEABLE
Nozzle Assembly,monitor Type,fir
Tyco Fire Products Lp
5306-00-405-26585009-9 INTERCHANGEABLE
Bolt,internally Relieved Body
Goodrich Aerospace Canada Ltd
2805-00-554-9255 INTERCHANGEABLE
Piston,internal Combustion Engin
6240-00-660-8159500-99-130V INTERCHANGEABLE
Lamp,incandescent
Lamp Industry for Use with Industry Designations and Abbreviations for Lamps
5360-00-804-481050099 INTERCHANGEABLE
Spring,helical,compression
Hydro-Aire Aerospace Corp
5310-01-019-2042 INTERCHANGEABLE
Nut,plain,hexagon
4820-01-157-63672C5660 INTERCHANGEABLE
Valve,check
Crissair Inc Div Esco Technologies
Cross-Reference Index
Part NumberManufacturer
S5500 3m Company (USA)
S5500 Aearo Company (USA)
50099 American Optical Co (USA)
S5500 American Optical Co (USA)
50099 Aearo Company (USA)
S5500 Aearo Company 1 Dba Aearo Div Ao Safety Occupational Prescription Eyewear (USA)
Related Parts
5950-00-118-2884INTERCHANGEABLE
TRANSFORMER,RADIO FREQUENCY
50099
6810-00-281-6934INTERCHANGEABLE
SUCROSE
5330-00-292-1593INTERCHANGEABLE
SEAL,PLAIN ENCASED
102039
4210-00-394-3209INTERCHANGEABLE
NOZZLE ASSEMBLY,MONITOR TYPE,FIR
S2500
5306-00-405-2658INTERCHANGEABLE
BOLT,INTERNALLY RELIEVED BODY
5009-9
2805-00-554-9255INTERCHANGEABLE
PISTON,INTERNAL COMBUSTION ENGIN
6240-00-660-8159INTERCHANGEABLE
LAMP,INCANDESCENT
500-99-130V
5360-00-804-4810INTERCHANGEABLE
SPRING,HELICAL,COMPRESSION
50099
5310-01-019-2042INTERCHANGEABLE
NUT,PLAIN,HEXAGON
4820-01-157-6367INTERCHANGEABLE
VALVE,CHECK
2C5660
5325-01-270-8348INTERCHANGEABLE
RING,RETAINING
5310-01-298-7690INTERCHANGEABLE
NUT,PLAIN,HEXAGON
22702

Frequently Asked Questions

What is NSN 4240-01-251-1577?

NSN 4240-01-251-1577 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 4240-01-251-1577?

NSN 4240-01-251-1577 has 6 cross-referenced part numbers: S5500 (3m Company), S5500 (Aearo Company), 50099 (American Optical Co), S5500 (American Optical Co), 50099 (Aearo Company) and 1 more.

What NSN replaces 4240-01-251-1577?

There are 12 known substitutes for 4240-01-251-1577: 5950-00-118-2884, 6810-00-281-6934, 5330-00-292-1593 and 9 more. Verify interchangeability with system specifications before substitution.

What are the specifications of S5500?

Key specifications for S5500: Adjustability: ADJUSTABLE; Exhaust Valve: INCLUDED; Filter Type: CARTRIDGE AND FILTER PAD; Material Type: ELASTIC. 11 total characteristics are documented in the Federal Logistics Information System.

Validated with multiple authoritative sources, including Government, OEM, and Certified sources.
PartsTable Design LLC · partstable.com