PartsTable TECHNICAL DATA SHEET
JULY 2026Technical Data Sheet

FIT-221 3/16Insulation Sleeving,electrical

Belden, Inc. · NSN 5970-00-451-0974 · FSC 5970 · No Item Name Available
Verified by PartsTable
NSN 5970-00-451-0974 — this item is cataloged by the U.S. Government under National Stock Number 5970-00-451-0974. Primary manufacturer part number: FIT-221 3/16.
Features
  • Insulation Sleeving,electrical — FSC 5970
  • Style Designator: SHRINKABLE
  • Flexibility: FLEXIBLE
  • Recovered Inside Diameter: 0.093 INCHES NOMINAL IN
  • Expanded Inside Diameter: 0.187 INCHES NOMINAL IN
  • Environmental Protection: MILDEW RESISTANT
  • Recovered Wall Thickness: 0.020 INCHES NOMINAL IN
  • Color: CLEAR
Applications
  • Industrial maintenance and repair
  • Government and military logistics
  • Equipment overhaul and refurbishment
General Description

The Insulation Sleeving,electrical, cataloged under National Stock Number 5970-00-451-0974, is classified within Federal Supply Class 5970 (No Item Name Available) of the Electrical and Electronic Equipment Components group. The primary manufacturer of record is Belden, Inc.. Government technical data includes 9 verified specifications, sourced from the Federal Logistics Information System (FLIS). This item has 3 commercial cross-references from 2 manufacturers, enabling identification through both NSN and commercial part number lookups. 9 verified substitutes exist in the FLIS interchangeability database. Current acquisition status: Active.

Technical Specifications
ParameterValue
NSN5970-00-451-0974
Primary Part NumberFIT-221 3/16
Item NameInsulation Sleeving,electrical
FSC / FSG5970 / 59 — No Item Name Available
ManufacturerBelden, Inc.
StatusACTIVE
Style DesignatorSHRINKABLE
FlexibilityFLEXIBLE
Recovered Inside Diameter0.093 INCHES NOMINAL IN
Expanded Inside Diameter0.187 INCHES NOMINAL IN
Environmental ProtectionMILDEW RESISTANT
Recovered Wall Thickness0.020 INCHES NOMINAL IN
ColorCLEAR
Dielectric Withstanding Voltage in Volts500.0
Temp Rating-67.0 FAHRENHEIT AND 275.0 FAHRENHEIT DEGF
Lifecycle & Compliance
Acquisition StatusACTIVE
HAZMATNo
Verified Substitutes 9
5920-00-280-3766 INTERCHANGEABLE
Adapter,fuse
5970-00-451-0971 INTERCHANGEABLE
Insulation Sleeving,electrical
5970-00-451-0972 INTERCHANGEABLE
Insulation Sleeving,electrical
5970-00-451-0973 INTERCHANGEABLE
Insulation Sleeving,electrical
5970-00-451-0976 INTERCHANGEABLE
Insulation Sleeving,electrical
5920-00-564-3584 INTERCHANGEABLE
Adapter,fuse
5970-00-767-052410105736-12 INTERCHANGEABLE
Insulation Sleeving,electrical
Us Army Aviation and Missile Command
5970-00-954-16229175615-1 INTERCHANGEABLE
Insulation Sleeving,electrical
Us Army Aviation and Missile Command
5970-01-324-7867HIX-3/16 BLACK SPLD INTERCHANGEABLE
Insulation Sleeving,electrical
Insulation Sources Inc Dba Ico Rally
Cross-Reference Index
Part NumberManufacturer
FIT-221 3/16 Belden, Inc. (USA)
MIL-I-23053/5 Military Specifications Promulgated by Military Departments/agencies Under Authority of Defense Standardization Manual 4120 3-M
CLASS2 Military Specifications Promulgated by Military Departments/agencies Under Authority of Defense Standardization Manual 4120 3-M
Related Parts
5920-00-280-3766INTERCHANGEABLE
ADAPTER,FUSE
5970-00-451-0971INTERCHANGEABLE
INSULATION SLEEVING,ELECTRICAL
5970-00-451-0972INTERCHANGEABLE
INSULATION SLEEVING,ELECTRICAL
5970-00-451-0973INTERCHANGEABLE
INSULATION SLEEVING,ELECTRICAL
5970-00-451-0976INTERCHANGEABLE
INSULATION SLEEVING,ELECTRICAL
5920-00-564-3584INTERCHANGEABLE
ADAPTER,FUSE
5970-00-767-0524INTERCHANGEABLE
INSULATION SLEEVING,ELECTRICAL
10105736-12
5970-00-954-1622INTERCHANGEABLE
INSULATION SLEEVING,ELECTRICAL
9175615-1
5970-01-324-7867INTERCHANGEABLE
INSULATION SLEEVING,ELECTRICAL
HIX-3/16 BLACK SPLD

Frequently Asked Questions

What is NSN 5970-00-451-0974?

NSN 5970-00-451-0974 is a Insulation Sleeving,electrical, manufactured by Belden, Inc., classified under FSC 5970 (No Item Name Available). Status: active.

What are the part numbers for NSN 5970-00-451-0974?

NSN 5970-00-451-0974 has 3 cross-referenced part numbers: FIT-221 3/16 (Belden, Inc.), MIL-I-23053/5 (Military Specifications Promulgated by Military Departments/agencies Under Authority of Defense Standardization Manual 4120 3-M), CLASS2 (Military Specifications Promulgated by Military Departments/agencies Under Authority of Defense Standardization Manual 4120 3-M).

What NSN replaces 5970-00-451-0974?

There are 9 known substitutes for 5970-00-451-0974: 5920-00-280-3766, 5970-00-451-0971, 5970-00-451-0972 and 6 more. Verify interchangeability with system specifications before substitution.

What are the specifications of FIT-221 3/16?

Key specifications for FIT-221 3/16: Style Designator: SHRINKABLE; Flexibility: FLEXIBLE; Recovered Inside Diameter: 0.093 INCHES NOMINAL IN; Expanded Inside Diameter: 0.187 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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