PartsTable TECHNICAL DATA SHEET
JULY 2026Technical Data Sheet

MIL-I-24703Insulation Sleeving,thermal

Military Specifications Promulgated by Military Departments/agencies Under Authority of Defense Standardization Manual 4120 3-M · NSN 5640-01-304-4031 · FSC 5640 · No Item Name Available
Verified by PartsTable
NSN 5640-01-304-4031 — this item is cataloged by the U.S. Government under National Stock Number 5640-01-304-4031. Primary manufacturer part number: MIL-I-24703.
Features
  • Insulation Sleeving,thermal — FSC 5640
  • Inside Diameter: 2.625 INCHES NOMINAL IN
  • Fabrication Method: EXPANDED
  • Nondefinitive Spec/std Data: T FORM
  • Material: POLYPHOSPHAZENE FOAM LOCATION NOT OTHERWISE SPECIFIED
  • Length: 72.000 INCHES NOMINAL IN
  • Flexibility: FLEXIBLE
  • Design Form: FULL ROUND
Applications
  • Applications requiring Polyphosphazene Foam Location Not Otherwise Specified construction
General Description

The Insulation Sleeving,thermal, cataloged under National Stock Number 5640-01-304-4031, is classified within Federal Supply Class 5640 (No Item Name Available) of the Construction and Building Materials group. The primary manufacturer of record is Military Specifications Promulgated by Military Departments/agencies Under Authority of Defense Standardization Manual 4120 3-M. Government technical data includes 9 verified specifications, sourced from the Federal Logistics Information System (FLIS). This item has 3 commercial cross-references from 3 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
NSN5640-01-304-4031
Primary Part NumberMIL-I-24703
Item NameInsulation Sleeving,thermal
FSC / FSG5640 / 56 — No Item Name Available
ManufacturerMilitary Specifications Promulgated by Military Departments/agencies Under Authority of Defense Standardization Manual 4120 3-M
StatusACTIVE
Inside Diameter2.625 INCHES NOMINAL IN
Fabrication MethodEXPANDED
Nondefinitive Spec/std DataT FORM
MaterialPOLYPHOSPHAZENE FOAM LOCATION NOT OTHERWISE SPECIFIED
Length72.000 INCHES NOMINAL IN
FlexibilityFLEXIBLE
Design FormFULL ROUND
Layer Quantity1
Insulation Thickness0.500 INCHES NOMINAL IN
Lifecycle & Compliance
Acquisition StatusACTIVE
HAZMATNo
Verified Substitutes 12
2815-00-146-2311 INTERCHANGEABLE
Plug
5120-00-199-7767 INTERCHANGEABLE
Socket,socket Wrench
4510-00-242-4357S82 INTERCHANGEABLE
Stopper,waste Drain
Kirkhill Inc
6685-00-260-75596156 INTERCHANGEABLE
Case,thermometer
Brooklyn Thermometer Co Inc
5310-00-274-98496156 INTERCHANGEABLE
Washer,flat
Honeywell Intl Inc Defense Avionics Systems Former Bendix Navigation and Control Systems
2990-00-297-2399631GC4101P7X AND 57GC259 INTERCHANGEABLE
Turbocharger,diesel
Mack Trucks, Inc. Dba Macungie Operations Div Lehigh Valley Operations
5930-00-379-42765169945 INTERCHANGEABLE
Switch,rotary
Rolls-Royce Solutions America Inc
6930-00-397-26736156 INTERCHANGEABLE
Shoe,brake Altitude
Instruments and Flight Research, Inc.
2835-00-705-453896156-1 INTERCHANGEABLE
Diaphragm Assembly
Honeywell International Inc. Dba Honeywell International Div Aerospace - Tempe (west Warner Road)
4520-00-917-7461 INTERCHANGEABLE
Heating Element,electrical,nonim
Cross-Reference Index
Part NumberManufacturer
MIL-I-24703 Military Specifications Promulgated by Military Departments/agencies Under Authority of Defense Standardization Manual 4120 3-M
6156 Ethyl Corp Commercial Development Div (USA)
MIL-I-24703 FMT General Services Administration Federal Supply Service (USA)
Related Parts
2815-00-146-2311INTERCHANGEABLE
PLUG
5120-00-199-7767INTERCHANGEABLE
SOCKET,SOCKET WRENCH
4510-00-242-4357INTERCHANGEABLE
STOPPER,WASTE DRAIN
S82
6685-00-260-7559INTERCHANGEABLE
CASE,THERMOMETER
6156
5310-00-274-9849INTERCHANGEABLE
WASHER,FLAT
6156
2990-00-297-2399INTERCHANGEABLE
TURBOCHARGER,DIESEL
631GC4101P7X AND 57GC259
5930-00-379-4276INTERCHANGEABLE
SWITCH,ROTARY
5169945
6930-00-397-2673INTERCHANGEABLE
SHOE,BRAKE ALTITUDE
6156
2835-00-705-4538INTERCHANGEABLE
DIAPHRAGM ASSEMBLY
96156-1
4520-00-917-7461INTERCHANGEABLE
HEATING ELEMENT,ELECTRICAL,NONIM
5120-01-064-1924INTERCHANGEABLE
WRENCH,BOX AND OPEN END,COMBINAT
5640-01-304-4030INTERCHANGEABLE
INSULATION SLEEVING,THERMAL

Frequently Asked Questions

What is NSN 5640-01-304-4031?

NSN 5640-01-304-4031 is a Insulation Sleeving,thermal, manufactured by Military Specifications Promulgated by Military Departments/agencies Under Authority of Defense Standardization Manual 4120 3-M, classified under FSC 5640 (No Item Name Available). Status: active.

What are the part numbers for NSN 5640-01-304-4031?

NSN 5640-01-304-4031 has 3 cross-referenced part numbers: MIL-I-24703 (Military Specifications Promulgated by Military Departments/agencies Under Authority of Defense Standardization Manual 4120 3-M), 6156 (Ethyl Corp Commercial Development Div), MIL-I-24703 FMT (General Services Administration Federal Supply Service).

What NSN replaces 5640-01-304-4031?

There are 12 known substitutes for 5640-01-304-4031: 2815-00-146-2311, 5120-00-199-7767, 4510-00-242-4357 and 9 more. Verify interchangeability with system specifications before substitution.

What are the specifications of MIL-I-24703?

Key specifications for MIL-I-24703: Inside Diameter: 2.625 INCHES NOMINAL IN; Fabrication Method: EXPANDED; Nondefinitive Spec/std Data: T FORM; Material: POLYPHOSPHAZENE FOAM LOCATION NOT OTHERWISE SPECIFIED. 10 total characteristics are documented in the Federal Logistics Information System.

Validated with multiple authoritative sources, including Government, OEM, and Certified sources.
PartsTable Design LLC · partstable.com