PartsTable TECHNICAL DATA SHEET
JULY 2026Technical Data Sheet

1MT20BPLamp,incandescent

Gte Products Corp Sylvania Miniature Lighting Div · NSN 6240-00-250-6435 · FSC 6240 · No Item Name Available
Verified by PartsTable
NSN 6240-00-250-6435 — this item is cataloged by the U.S. Government under National Stock Number 6240-00-250-6435. Primary manufacturer part number: 1MT20BP.
Features
  • Lamp,incandescent — FSC 6240
  • Filament Designation: C-13C-13
  • Emitted Light Characteristic: COLORLESSCOLORLESS
  • Bulb Light Transmission Characteristic: TRANSPARENTTRANSPARENT
  • Current Rating for Which Designed: 8.333 AMPERES NOMINAL8.333 AMPERES NOMINAL
  • Filament Heavy Duty Service Rating: NOT RATEDNOT RATED
  • Voltage Rating: 120.000 VOLTS NOMINAL120.000 VOLTS NOMINAL
  • Bulb Designator: T-20T-20
Applications
  • Area illumination
  • Indicator and warning display
  • Navigation and signal lighting
General Description

The Lamp,incandescent, cataloged under National Stock Number 6240-00-250-6435, is classified within Federal Supply Class 6240 (No Item Name Available) of the Lighting Fixtures and Lamps group. The primary manufacturer of record is Gte Products Corp Sylvania Miniature Lighting Div. Government technical data includes 15 verified specifications, sourced from the Federal Logistics Information System (FLIS). This item has 7 commercial cross-references from 7 manufacturers, enabling identification through both NSN and commercial part number lookups. 1 verified substitute exists in the FLIS interchangeability database. Current acquisition status: Cancelled.

Technical Specifications
ParameterValue
NSN6240-00-250-6435
Primary Part Number1MT20BP
Item NameLamp,incandescent
FSC / FSG6240 / 62 — No Item Name Available
ManufacturerGte Products Corp Sylvania Miniature Lighting Div
StatusCANCELLED
Filament DesignationC-13C-13
Emitted Light CharacteristicCOLORLESSCOLORLESS
Bulb Light Transmission CharacteristicTRANSPARENTTRANSPARENT
Current Rating for Which Designed8.333 AMPERES NOMINAL8.333 AMPERES NOMINAL
Filament Heavy Duty Service RatingNOT RATEDNOT RATED
Voltage Rating120.000 VOLTS NOMINAL120.000 VOLTS NOMINAL
Bulb DesignatorT-20T-20
Average Life Rating in Hours500.0500.0
Light Output Rating22000.000 LUMENS NOMINAL SINGLE RATING22000.000 LUMENS NOMINAL SINGLE RATING
Bulb StyleT (TUBULAR)T (TUBULAR)
Wattage Rating1000.000 WATTS1000.000 WATTS
Features ProvidedFILAMENT SHIELDING AND FILAMENT SHIELDING AND HEAT RESISTANT GLASSHEAT RESISTANT GLASS
Rated Average LifeHOURSHOURS
Base StyleMOGUL BIPOSTMOGUL BIPOST
Burning PositionHORIZONTALHORIZONTAL
Lifecycle & Compliance
Acquisition StatusCANCELLED
HAZMATNo
Verified Substitutes 1
6240-00-143-3142 INTERCHANGEABLE
Lamp,incandescent
Cross-Reference Index
Part NumberManufacturer
MS25015-1 Military Standards Promulgated by Military Departments Under Authority of Defense Standardization Manual 4120 3-M
W-L-101 Federal Specifications Promulgated by General Services Administration Washington DC (USA)
1MT20BP115 Carlisle & Finch Co (USA)
1MT20BP120V Lamp Industry for Use with Industry Designations and Abbreviations for Lamps
1MT20BP PRIMARY Gte Products Corp Sylvania Miniature Lighting Div (USA)
1MT20BP120 American National Standards Institute Incorporated Dba American National Standards Institute (USA)
950101-S6600-676933 Naval Inventory Control Point Mechanicsburg (USA)
Related Parts
6240-00-143-3142INTERCHANGEABLE
LAMP,INCANDESCENT

Frequently Asked Questions

What is NSN 6240-00-250-6435?

NSN 6240-00-250-6435 is a Lamp,incandescent, manufactured by Gte Products Corp Sylvania Miniature Lighting Div, classified under FSC 6240 (No Item Name Available). Status: cancelled.

What are the part numbers for NSN 6240-00-250-6435?

NSN 6240-00-250-6435 has 7 cross-referenced part numbers: MS25015-1 (Military Standards Promulgated by Military Departments Under Authority of Defense Standardization Manual 4120 3-M), W-L-101 (Federal Specifications Promulgated by General Services Administration Washington DC), 1MT20BP115 (Carlisle & Finch Co), 1MT20BP120V (Lamp Industry for Use with Industry Designations and Abbreviations for Lamps), 1MT20BP (Gte Products Corp Sylvania Miniature Lighting Div) and 2 more.

What NSN replaces 6240-00-250-6435?

There is 1 known substitute for 6240-00-250-6435: 6240-00-143-3142. Verify interchangeability with system specifications before substitution.

What are the specifications of 1MT20BP?

Key specifications for 1MT20BP: Filament Designation: C-13C-13; Emitted Light Characteristic: COLORLESSCOLORLESS; Bulb Light Transmission Characteristic: TRANSPARENTTRANSPARENT; Current Rating for Which Designed: 8.333 AMPERES NOMINAL8.333 AMPERES NOMINAL. 17 total characteristics are documented in the Federal Logistics Information System.

Is NSN 6240-00-250-6435 still in active supply?

NSN 6240-00-250-6435 is currently cancelled. Check with the Defense Logistics Agency for current availability and authorized substitutes.

Validated with multiple authoritative sources, including Government, OEM, and Certified sources.
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