PartsTable TECHNICAL DATA SHEET
JULY 2026Technical Data Sheet

R4530Respirator,air Filtering

Square D Co Monroe Plant · NSN 4240-01-251-1567 · FSC 4240 · No Item Name Available
Verified by PartsTable
NSN 4240-01-251-1567 — this item is cataloged by the U.S. Government under National Stock Number 4240-01-251-1567. Primary manufacturer part number: R4530.
Features
  • Respirator,air Filtering — FSC 4240
  • Adjustability: ADJUSTABLE
  • Filter Replaceability: REPLACEABLE
  • Mask Filter Quantity: 2
  • Material Type: ELASTIC
  • Filter Type: CARTRIDGE AND FILTER PAD
  • Exhaust Valve: INCLUDED
  • Material: RUBBER MASK
Applications
  • Applications requiring Rubber Mask construction
General Description

The Respirator,air Filtering, cataloged under National Stock Number 4240-01-251-1567, 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 10 verified specifications, sourced from the Federal Logistics Information System (FLIS). This item has 4 commercial cross-references from 2 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
NSN4240-01-251-1567
Primary Part NumberR4530
Item NameRespirator,air Filtering
FSC / FSG4240 / 42 — No Item Name Available
ManufacturerSquare D Co Monroe Plant
StatusACTIVE
AdjustabilityADJUSTABLE
Filter ReplaceabilityREPLACEABLE
Mask Filter Quantity2
Material TypeELASTIC
Filter TypeCARTRIDGE AND FILTER PAD
Exhaust ValveINCLUDED
MaterialRUBBER MASK
Criticality Code JustificationFEAT
Head HarnessINCLUDED
Mask TypeHALF FACEPIECE
Lifecycle & Compliance
Acquisition StatusACTIVE
HAZMATNo
Verified Substitutes 12
5133-00-222-9469 INTERCHANGEABLE
Drill,twist
1005-00-523-0039 INTERCHANGEABLE
Pin Hammer
4820-00-595-1175 INTERCHANGEABLE
Disk,valve
5331-00-811-16295145-006 INTERCHANGEABLE
O-Ring
Eaton Corporation Dba Jackson Plant
4720-01-012-1677SAE-20R1ECLTH-A-57X76 INTERCHANGEABLE
Hose,nonmetallic
Sae International Dba Sae International
5999-01-232-97891129-043-01 INTERCHANGEABLE
Shielding Gasket,electronic
Conax Florida Corporation
6110-01-270-6028 INTERCHANGEABLE
Contactor,magnetic
3455-01-330-259050401 INTERCHANGEABLE
Cutter,milling,end
Regal-Beloit Corp Durst Div
5998-01-369-3797504-01 INTERCHANGEABLE
Circuit Card Assembly
Pep Modular Computers Inc
6240-01-411-34075040-1 INTERCHANGEABLE
Sign,exit Retrofit
Northstar Technologies and Lighting
Cross-Reference Index
Part NumberManufacturer
R4530 PRIMARY Square D Co Monroe Plant (USA)
50401 Square D Co Monroe Plant (USA)
R4530 American Optical Co (USA)
50401 American Optical Co (USA)
Related Parts
5133-00-222-9469INTERCHANGEABLE
DRILL,TWIST
1005-00-523-0039INTERCHANGEABLE
PIN HAMMER
4820-00-595-1175INTERCHANGEABLE
DISK,VALVE
5331-00-811-1629INTERCHANGEABLE
O-RING
5145-006
4720-01-012-1677INTERCHANGEABLE
HOSE,NONMETALLIC
SAE-20R1ECLTH-A-57X76
5999-01-232-9789INTERCHANGEABLE
SHIELDING GASKET,ELECTRONIC
1129-043-01
6110-01-270-6028INTERCHANGEABLE
CONTACTOR,MAGNETIC
3455-01-330-2590INTERCHANGEABLE
CUTTER,MILLING,END
50401
5998-01-369-3797INTERCHANGEABLE
CIRCUIT CARD ASSEMBLY
504-01
6240-01-411-3407INTERCHANGEABLE
SIGN,EXIT RETROFIT
5040-1
5820-01-512-5215INTERCHANGEABLE
RECEIVER-TRANSMITTER,RADIO
50401
8150-01-603-9741INTERCHANGEABLE
CONTAINER,FREIGHT,UTILITY
5040-1

Frequently Asked Questions

What is NSN 4240-01-251-1567?

NSN 4240-01-251-1567 is a 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 4240-01-251-1567?

NSN 4240-01-251-1567 has 4 cross-referenced part numbers: R4530 (Square D Co Monroe Plant), 50401 (Square D Co Monroe Plant), R4530 (American Optical Co), 50401 (American Optical Co).

What NSN replaces 4240-01-251-1567?

There are 12 known substitutes for 4240-01-251-1567: 5133-00-222-9469, 1005-00-523-0039, 4820-00-595-1175 and 9 more. Verify interchangeability with system specifications before substitution.

What are the specifications of R4530?

Key specifications for R4530: Adjustability: ADJUSTABLE; Filter Replaceability: REPLACEABLE; Mask Filter Quantity: 2; 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.
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