PartsTable TECHNICAL DATA SHEET
JULY 2026Technical Data Sheet

R1050Mask,air Filtering

Square D Co Monroe Plant · NSN 4240-01-250-7480 · FSC 4240 · No Item Name Available
Verified by PartsTable
NSN 4240-01-250-7480 — this item is cataloged by the U.S. Government under National Stock Number 4240-01-250-7480. Primary manufacturer part number: R1050.
Features
  • Mask,air Filtering — FSC 4240
  • Material Type: ELASTIC
  • Head Harness: INCLUDED
  • 4 verified cross-references
  • Primary manufacturer: Square D Co Monroe Plant
Applications
  • Industrial maintenance and repair
  • Government and military logistics
  • Equipment overhaul and refurbishment
General Description

The Mask,air Filtering, cataloged under National Stock Number 4240-01-250-7480, 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
NSN4240-01-250-7480
Primary Part NumberR1050
Item NameMask,air Filtering
FSC / FSG4240 / 42 — No Item Name Available
ManufacturerSquare D Co Monroe Plant
StatusACTIVE
Material TypeELASTIC
Head HarnessINCLUDED
Lifecycle & Compliance
Acquisition StatusACTIVE
HAZMATNo
Verified Substitutes 10
5315-00-017-7923 INTERCHANGEABLE
Pin,cotter
5330-00-178-3100 INTERCHANGEABLE
Seal,plain Encased
5315-00-343-703759063 INTERCHANGEABLE
Pin,squeeze Grip Locking
Harold D Hard Co
5315-00-392-7759SM-B-148434 INTERCHANGEABLE
Pin,eccentric
Us Army Communications & Electronics Materiel Readiness Command Logistics Engineering Dir
5310-00-873-3194M45938/11-10CL INTERCHANGEABLE
Nut,self-Locking,clinch
National Aerospace Standards Committee Aerospace Industries Association of America Inc Not for Rfq or Solicitation Use
5985-01-085-9317R1050 INTERCHANGEABLE
Antenna Elevator Group
Naval Air Warfare Ctr Aircraft Div
5330-01-223-556670-74012-020 INTERCHANGEABLE
Retainer,packing
Gardner Denver Water Jetting Systems, Inc. Div Engineered Package Group
5950-01-358-8788R1050 INTERCHANGEABLE
Transformer,audio Frequency
Rauland-Borg Corp
5340-01-419-125850208 INTERCHANGEABLE
Catch,clamping
Griffith Rubber Mills
5220-01-549-439250208 INTERCHANGEABLE
Gage,headspace
American Apex Corporation
Cross-Reference Index
Part NumberManufacturer
R1050 American Optical Co (USA)
R1050 PRIMARY Square D Co Monroe Plant (USA)
50208 American Optical Co (USA)
50208 Aearo Company (USA)
Related Parts
5315-00-017-7923INTERCHANGEABLE
PIN,COTTER
5330-00-178-3100INTERCHANGEABLE
SEAL,PLAIN ENCASED
5315-00-343-7037INTERCHANGEABLE
PIN,SQUEEZE GRIP LOCKING
59063
5315-00-392-7759INTERCHANGEABLE
PIN,ECCENTRIC
SM-B-148434
5310-00-873-3194INTERCHANGEABLE
NUT,SELF-LOCKING,CLINCH
M45938/11-10CL
5985-01-085-9317INTERCHANGEABLE
ANTENNA ELEVATOR GROUP
R1050
5330-01-223-5566INTERCHANGEABLE
RETAINER,PACKING
70-74012-020
5950-01-358-8788INTERCHANGEABLE
TRANSFORMER,AUDIO FREQUENCY
R1050
5340-01-419-1258INTERCHANGEABLE
CATCH,CLAMPING
50208
5220-01-549-4392INTERCHANGEABLE
GAGE,HEADSPACE
50208

Frequently Asked Questions

What is NSN 4240-01-250-7480?

NSN 4240-01-250-7480 is a Mask,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 4240-01-250-7480?

NSN 4240-01-250-7480 has 4 cross-referenced part numbers: R1050 (American Optical Co), R1050 (Square D Co Monroe Plant), 50208 (American Optical Co), 50208 (Aearo Company).

What NSN replaces 4240-01-250-7480?

There are 10 known substitutes for 4240-01-250-7480: 5315-00-017-7923, 5330-00-178-3100, 5315-00-343-7037 and 7 more. Verify interchangeability with system specifications before substitution.

What are the specifications of R1050?

Key specifications for R1050: Material Type: ELASTIC; Head Harness: INCLUDED; Special Features: NIOSH APPROVAL NO. TC-21C-147; SOLE SOURCE REQUIRED BY STATUTE 6.302, PLEATED; TAPERED ANGEL DESIGN; WOVEN ELASTIC HEADBAND; STITCHED; SOFT ROLYESTER BINDING; CONCEALED NOSEBAND. 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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