PartsTable TECHNICAL DATA SHEET
JULY 2026Technical Data Sheet

R49AFilter,respirator,air Filtering

Square D Co Monroe Plant · NSN 4240-01-245-3331 · FSC 4240 · No Item Name Available
Verified by PartsTable
NSN 4240-01-245-3331 — this item is cataloged by the U.S. Government under National Stock Number 4240-01-245-3331. Primary manufacturer part number: R49A.
Features
  • Filter,respirator,air Filtering — FSC 4240
  • Criticality Code Justification: FEAT
  • Hazard Protection Feature: PAINT MIST
  • 4 verified cross-references
  • Primary manufacturer: Square D Co Monroe Plant
Applications
  • Fluid filtration and purification
  • Engine intake air cleaning
  • Hydraulic system protection
General Description

The Filter,respirator,air Filtering, cataloged under National Stock Number 4240-01-245-3331, 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 Square D Co Monroe Plant. Government technical data includes 2 verified specifications, sourced from the Federal Logistics Information System (FLIS). This item has 4 commercial cross-references from 3 manufacturers, enabling identification through both NSN and commercial part number lookups. 10 verified substitutes exist in the FLIS interchangeability database. Current acquisition status: Active.

Technical Specifications
ParameterValue
NSN4240-01-245-3331
Primary Part NumberR49A
Item NameFilter,respirator,air Filtering
FSC / FSG4240 / 42 — No Item Name Available
ManufacturerSquare D Co Monroe Plant
StatusACTIVE
Criticality Code JustificationFEAT
Hazard Protection FeaturePAINT MIST
Lifecycle & Compliance
Acquisition StatusACTIVE
HAZMATNo
Verified Substitutes 10
5315-00-188-0174MS24692-133 INTERCHANGEABLE
Pin,tapered,plain
National Aerospace Standards Committee Aerospace Industries Association of America Inc Not for Rfq or Solicitation Use
5133-00-236-4100 INTERCHANGEABLE
Drill,twist
2940-00-376-857651028 INTERCHANGEABLE
Filter Element,fluid
Wix Corp
4720-00-737-7853M1M215603 INTERCHANGEABLE
Hose Assembly,nonmetallic
Echelon Supply and Service, Inc.
7920-00-912-549900929 INTERCHANGEABLE
Brush,wire,tube
Schaefer Brush Mfg Co Inc
6150-01-108-388236885-9-HP INTERCHANGEABLE
Cable Assembly,special Purpose,e
Setra Systems, Inc. Dba Gems Sensors
5905-01-172-4113 INTERCHANGEABLE
Resistor Assembly
9150-01-222-199551028 INTERCHANGEABLE
Lubricant,solid Film
Federal-Mogul Corp Fel-Pro Gasket Div
5315-01-273-236351028 INTERCHANGEABLE
Pin,shoulder,headed
Woodward Hrt Inc
4730-01-629-97511G0170 INTERCHANGEABLE
Adapter,straight,pipe to Tube
Getz Fire Equipment Company Dba Getz Fire Equipment Co
Cross-Reference Index
Part NumberManufacturer
51028 American Optical Co (USA)
51028 Aearo Company (USA)
R49A American Optical Co (USA)
R49A PRIMARY Square D Co Monroe Plant (USA)
Related Parts
5315-00-188-0174INTERCHANGEABLE
PIN,TAPERED,PLAIN
MS24692-133
5133-00-236-4100INTERCHANGEABLE
DRILL,TWIST
2940-00-376-8576INTERCHANGEABLE
FILTER ELEMENT,FLUID
51028
4720-00-737-7853INTERCHANGEABLE
HOSE ASSEMBLY,NONMETALLIC
M1M215603
7920-00-912-5499INTERCHANGEABLE
BRUSH,WIRE,TUBE
00929
6150-01-108-3882INTERCHANGEABLE
CABLE ASSEMBLY,SPECIAL PURPOSE,E
36885-9-HP
5905-01-172-4113INTERCHANGEABLE
RESISTOR ASSEMBLY
9150-01-222-1995INTERCHANGEABLE
LUBRICANT,SOLID FILM
51028
5315-01-273-2363INTERCHANGEABLE
PIN,SHOULDER,HEADED
51028
4730-01-629-9751INTERCHANGEABLE
ADAPTER,STRAIGHT,PIPE TO TUBE
1G0170

Frequently Asked Questions

What is NSN 4240-01-245-3331?

NSN 4240-01-245-3331 is a Filter,respirator,air Filtering, manufactured by Square D Co Monroe Plant, classified under FSC 4240 (No Item Name Available). Status: active.

What are the part numbers for NSN 4240-01-245-3331?

NSN 4240-01-245-3331 has 4 cross-referenced part numbers: 51028 (American Optical Co), 51028 (Aearo Company), R49A (American Optical Co), R49A (Square D Co Monroe Plant).

What NSN replaces 4240-01-245-3331?

There are 10 known substitutes for 4240-01-245-3331: 5315-00-188-0174, 5133-00-236-4100, 2940-00-376-8576 and 7 more. Verify interchangeability with system specifications before substitution.

What are the specifications of R49A?

Key specifications for R49A: Criticality Code Justification: FEAT; Special Features: NIOSH APPROVAL NO. TC-23C-333; USED ON AMERICAN OPTICAL MODELS R/S4000,R/S5000,R/S6000 AND R/S7000 RESPIRATORS; SOLE SOURCE REQUIRED BY STATUTE 6.302; Hazard Protection Feature: PAINT MIST. 3 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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