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 5640-01-307-4725 · FSC 5640 · No Item Name Available
Verified by PartsTable
NSN 5640-01-307-4725 — this item is cataloged by the U.S. Government under National Stock Number 5640-01-307-4725. Primary manufacturer part number: MIL-I-24703.
Features
  • Insulation Sleeving,thermal — FSC 5640
  • Flexibility: FLEXIBLE
  • Nondefinitive Spec/std Data: T FORM
  • Material: POLYPHOSPHAZENE FOAM LOCATION NOT OTHERWISE SPECIFIED
  • Inside Diameter: 1.125 INCHES NOMINAL IN
  • Design Form: FULL ROUND
  • Length: 72.000 INCHES NOMINAL IN
  • Layer Quantity: 1
Applications
  • Applications requiring Polyphosphazene Foam Location Not Otherwise Specified construction
General Description

The Insulation Sleeving,thermal, cataloged under National Stock Number 5640-01-307-4725, 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
NSN5640-01-307-4725
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
FlexibilityFLEXIBLE
Nondefinitive Spec/std DataT FORM
MaterialPOLYPHOSPHAZENE FOAM LOCATION NOT OTHERWISE SPECIFIED
Inside Diameter1.125 INCHES NOMINAL IN
Design FormFULL ROUND
Length72.000 INCHES NOMINAL IN
Layer Quantity1
Insulation Thickness0.750 INCHES NOMINAL IN
Fabrication MethodEXPANDED
Lifecycle & Compliance
Acquisition StatusACTIVE
HAZMATNo
Verified Substitutes 12
2930-00-246-3293 INTERCHANGEABLE
Slinger,water Pump
5330-00-290-78636149 INTERCHANGEABLE
Gasket
King Engineering Corporation Dba King-Gage Systems
5999-01-056-8010 INTERCHANGEABLE
Heat Sink,electrical-Electronic
3930-01-172-6771 INTERCHANGEABLE
Handling Attachment,fork Lift Tr
5985-01-181-1679586R450H01 INTERCHANGEABLE
Switch,radio Frequency Transmiss
Northrop Grumman Systems Corporation Dba Northrop Grumman Systems Corp
5930-01-252-675461-49 INTERCHANGEABLE
Switch,toggle
Heathkit Co Inc Dba Heathkit Educational Systems
5640-01-304-4030 INTERCHANGEABLE
Insulation Sleeving,thermal
5640-01-304-4031 INTERCHANGEABLE
Insulation Sleeving,thermal
5640-01-304-4032 INTERCHANGEABLE
Insulation Sleeving,thermal
5640-01-304-4033 INTERCHANGEABLE
Insulation Sleeving,thermal
Cross-Reference Index
Part NumberManufacturer
MIL-I-24703 Military Specifications Promulgated by Military Departments/agencies Under Authority of Defense Standardization Manual 4120 3-M
6149 Ethyl Corp Commercial Development Div (USA)
MIL-I-24703 FMT General Services Administration Federal Supply Service (USA)
Related Parts
2930-00-246-3293INTERCHANGEABLE
SLINGER,WATER PUMP
5330-00-290-7863INTERCHANGEABLE
GASKET
6149
5999-01-056-8010INTERCHANGEABLE
HEAT SINK,ELECTRICAL-ELECTRONIC
3930-01-172-6771INTERCHANGEABLE
HANDLING ATTACHMENT,FORK LIFT TR
5985-01-181-1679INTERCHANGEABLE
SWITCH,RADIO FREQUENCY TRANSMISS
586R450H01
5930-01-252-6754INTERCHANGEABLE
SWITCH,TOGGLE
61-49
5640-01-304-4030INTERCHANGEABLE
INSULATION SLEEVING,THERMAL
5640-01-304-4031INTERCHANGEABLE
INSULATION SLEEVING,THERMAL
5640-01-304-4032INTERCHANGEABLE
INSULATION SLEEVING,THERMAL
5640-01-304-4033INTERCHANGEABLE
INSULATION SLEEVING,THERMAL
5640-01-307-4721INTERCHANGEABLE
INSULATION SLEEVING,THERMAL
5640-01-307-4722INTERCHANGEABLE
INSULATION SLEEVING,THERMAL

Frequently Asked Questions

What is NSN 5640-01-307-4725?

NSN 5640-01-307-4725 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 5640-01-307-4725?

NSN 5640-01-307-4725 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), 6149 (Ethyl Corp Commercial Development Div), MIL-I-24703 FMT (General Services Administration Federal Supply Service).

What NSN replaces 5640-01-307-4725?

There are 12 known substitutes for 5640-01-307-4725: 2930-00-246-3293, 5330-00-290-7863, 5999-01-056-8010 and 9 more. Verify interchangeability with system specifications before substitution.

What are the specifications of MIL-I-24703?

Key specifications for MIL-I-24703: Flexibility: FLEXIBLE; Nondefinitive Spec/std Data: T FORM; Material: POLYPHOSPHAZENE FOAM LOCATION NOT OTHERWISE SPECIFIED; Inside Diameter: 1.125 INCHES NOMINAL IN. 10 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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