PartsTable TECHNICAL DATA SHEET
JULY 2026Technical Data Sheet

B250Respirator,air Filtering

Pro-Tech Respirators Inc · NSN 4240-01-249-9170 · FSC 4240 · No Item Name Available
Verified by PartsTable
NSN 4240-01-249-9170 — this item is cataloged by the U.S. Government under National Stock Number 4240-01-249-9170. Primary manufacturer part number: B250.
Features
  • Respirator,air Filtering — FSC 4240
  • 2 verified cross-references
  • Primary manufacturer: Pro-Tech Respirators Inc
Applications
  • Industrial maintenance and repair
  • Government and military logistics
  • Equipment overhaul and refurbishment
General Description

The Respirator,air Filtering, cataloged under National Stock Number 4240-01-249-9170, 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 Pro-Tech Respirators Inc. This item has 2 commercial cross-references from 1 manufacturer, 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
NSN4240-01-249-9170
Primary Part NumberB250
Item NameRespirator,air Filtering
FSC / FSG4240 / 42 — No Item Name Available
ManufacturerPro-Tech Respirators Inc
StatusACTIVE
Lifecycle & Compliance
Acquisition StatusACTIVE
HAZMATNo
Verified Substitutes 12
5910-00-018-0554 INTERCHANGEABLE
Capacitor,fixed,ceramic Dielectr
5910-00-128-8745CC251A500VDCW INTERCHANGEABLE
Capacitor,fixed,ceramic Dielectr
Rauland-Borg Corp
4820-00-203-39760168 INTERCHANGEABLE
Valve,angle
Hoffman/new Yorker, Inc.
4820-00-203-3980 INTERCHANGEABLE
Valve,angle
4530-00-394-8486B-2-1-201 INTERCHANGEABLE
Barrel,ring
Todd Combustion Inc
5925-00-644-5546B25.0 INTERCHANGEABLE
Thermal Release,circuit Breaker
Schneider Electric Usa, Inc.
5950-00-794-5879B222 INTERCHANGEABLE
Coil,radio Frequency
Payne Magnetics, Inc.
4510-00-835-1172B-0222 INTERCHANGEABLE
Faucet,mixing
T and S Brass and Bronze Works Inc
4820-00-875-4556504 1.00IN INTERCHANGEABLE
Valve,angle
Milwaukee Valve Co, Inc Div Milwaukee Valve Company, Llc
5975-00-973-9567 INTERCHANGEABLE
Bushing,electrical Conduit
Cross-Reference Index
Part NumberManufacturer
B250 Pro-Tech Respirators Inc (USA)
B222 Pro-Tech Respirators Inc (USA)
Related Parts
5910-00-018-0554INTERCHANGEABLE
CAPACITOR,FIXED,CERAMIC DIELECTR
5910-00-128-8745INTERCHANGEABLE
CAPACITOR,FIXED,CERAMIC DIELECTR
CC251A500VDCW
4820-00-203-3976INTERCHANGEABLE
VALVE,ANGLE
0168
4820-00-203-3980INTERCHANGEABLE
VALVE,ANGLE
4530-00-394-8486INTERCHANGEABLE
BARREL,RING
B-2-1-201
5925-00-644-5546INTERCHANGEABLE
THERMAL RELEASE,CIRCUIT BREAKER
B25.0
5950-00-794-5879INTERCHANGEABLE
COIL,RADIO FREQUENCY
B222
4510-00-835-1172INTERCHANGEABLE
FAUCET,MIXING
B-0222
4820-00-875-4556INTERCHANGEABLE
VALVE,ANGLE
504 1.00IN
5975-00-973-9567INTERCHANGEABLE
BUSHING,ELECTRICAL CONDUIT
5940-01-036-5543INTERCHANGEABLE
TERMINAL,QUICK DISCONNECT
B-250
5950-01-176-2060INTERCHANGEABLE
REACTOR
844-014-001

Frequently Asked Questions

What is NSN 4240-01-249-9170?

NSN 4240-01-249-9170 is a Respirator,air Filtering, manufactured by Pro-Tech Respirators Inc, classified under FSC 4240 (No Item Name Available). Status: active.

What are the part numbers for NSN 4240-01-249-9170?

NSN 4240-01-249-9170 has 2 cross-referenced part numbers: B250 (Pro-Tech Respirators Inc), B222 (Pro-Tech Respirators Inc).

What NSN replaces 4240-01-249-9170?

There are 12 known substitutes for 4240-01-249-9170: 5910-00-018-0554, 5910-00-128-8745, 4820-00-203-3976 and 9 more. Verify interchangeability with system specifications before substitution.

What are the specifications of B250?

Key specifications for B250: Special Features: MEDIUM SIZE 1490 MODEL HALF MASK. MOLDED OF NON ALLERGENIC PVC COMPOUND.. 1 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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