PartsTable TECHNICAL DATA SHEET
JULY 2026Technical Data Sheet

SPEC40SMask,air Line

E. D. Bullard Company Dba Ed Bullard Co · NSN 4240-01-421-3663 · FSC 4240 · No Item Name Available
Verified by PartsTable
NSN 4240-01-421-3663 — this item is cataloged by the U.S. Government under National Stock Number 4240-01-421-3663. Primary manufacturer part number: SPEC40S.
Features
  • Mask,air Line — FSC 4240
  • 3 verified cross-references
  • Primary manufacturer: E. D. Bullard Company Dba Ed Bullard Co
Applications
  • Industrial maintenance and repair
  • Government and military logistics
  • Equipment overhaul and refurbishment
General Description

The Mask,air Line, cataloged under National Stock Number 4240-01-421-3663, 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 E. D. Bullard Company Dba Ed Bullard Co. This item has 3 commercial cross-references from 1 manufacturer, enabling identification through both NSN and commercial part number lookups. 7 verified substitutes exist in the FLIS interchangeability database. Current acquisition status: Active.

Technical Specifications
ParameterValue
NSN4240-01-421-3663
Primary Part NumberSPEC40S
Item NameMask,air Line
FSC / FSG4240 / 42 — No Item Name Available
ManufacturerE. D. Bullard Company Dba Ed Bullard Co
StatusACTIVE
Lifecycle & Compliance
Acquisition StatusACTIVE
HAZMATNo
Verified Substitutes 7
3815-00-010-286340S INTERCHANGEABLE
Shank-Tooth,surface Ripping
Esco Corporation
5905-00-173-9830 INTERCHANGEABLE
Resistor,fixed,wire Wound
5905-00-193-5026 INTERCHANGEABLE
Resistor,fixed,wire Wound
5905-00-270-6752 INTERCHANGEABLE
Resistor,fixed,wire Wound
2040-00-629-967940S INTERCHANGEABLE
Anchor,marine,fluked
Tie Down Engineering Inc
5110-01-367-72474008SD INTERCHANGEABLE
Pliers,diagonal Cutting
Channellock, Inc
5999-01-394-2185 INTERCHANGEABLE
Component Package,electronic
Cross-Reference Index
Part NumberManufacturer
SPEC40S PRIMARY E. D. Bullard Company Dba Ed Bullard Co (USA)
40S E. D. Bullard Company Dba Ed Bullard Co (USA)
M4540S E. D. Bullard Company Dba Ed Bullard Co (USA)
Related Parts
3815-00-010-2863INTERCHANGEABLE
SHANK-TOOTH,SURFACE RIPPING
40S
5905-00-173-9830INTERCHANGEABLE
RESISTOR,FIXED,WIRE WOUND
5905-00-193-5026INTERCHANGEABLE
RESISTOR,FIXED,WIRE WOUND
5905-00-270-6752INTERCHANGEABLE
RESISTOR,FIXED,WIRE WOUND
2040-00-629-9679INTERCHANGEABLE
ANCHOR,MARINE,FLUKED
40S
5110-01-367-7247INTERCHANGEABLE
PLIERS,DIAGONAL CUTTING
4008SD
5999-01-394-2185INTERCHANGEABLE
COMPONENT PACKAGE,ELECTRONIC

Frequently Asked Questions

What is NSN 4240-01-421-3663?

NSN 4240-01-421-3663 is a Mask,air Line, manufactured by E. D. Bullard Company Dba Ed Bullard Co, classified under FSC 4240 (No Item Name Available). Status: active.

What are the part numbers for NSN 4240-01-421-3663?

NSN 4240-01-421-3663 has 3 cross-referenced part numbers: SPEC40S (E. D. Bullard Company Dba Ed Bullard Co), 40S (E. D. Bullard Company Dba Ed Bullard Co), M4540S (E. D. Bullard Company Dba Ed Bullard Co).

What NSN replaces 4240-01-421-3663?

There are 7 known substitutes for 4240-01-421-3663: 3815-00-010-2863, 5905-00-173-9830, 5905-00-193-5026 and 4 more. Verify interchangeability with system specifications before substitution.

What are the specifications of SPEC40S?

Key specifications for SPEC40S: Special Features: SILICONE MASK; SMALL FULL FACE MASK; BREATHING TUBE WITH ADJUSTABLE FLOW CONTROL VALVE; CONTINUOUS FLOW/PRESSURE DEMAND; SOLE SOURCE REQUIRED BY STATUTE 6.302; NIOSH APPROVAL TC-19C-322 AND 321; End Item Identification: E.D. BULLARD COMPANY, SERIES M45. 2 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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