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Knob Insulator

NSN: 5970-00-224-5228 | Model: IN37
ITAR Registered seal

An insulator of generally cylindrical shape which is designed to be attached to a rigid structure.

NSN Properties and Flags
NATO Stock Number
Yes - ITAR Controlled
Outside Diameter
1.125 inches
Mounting Hole Diameter
0.250 inches
Mounting Facility Type And Quantity
1 unthreaded hole
Second Distance From Conductor Slot To Opposite Surface
1.000 inches
First Distance From Conductor Slot To Opposite Surface
0.750 inches
Material And Location
Mounting base porcelain ERR-100 ERR-100
Style Designator
Cylindrical, split

Pricing and Availability

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NSN 5970-00-224-5228 Datasheet

Supply Class (FSC):
Electrical Insulators And Insulating Materials
Cross Reference:
  • IN37
  • 5 1/2
  • 5 1/2 IN37
  • 51-2IN37
Cage Codes:
  • Us Army Communications & (CAGE 80063)
  • Procelain Products Co (CAGE 74178)
  • Star Electric Division Thomas Delta (CAGE 74368)
  • 5970-00-224-5228 replaces 5970-00-227-9081
Schedule B & Trade:
  • Schedule B: 8546900000 (NAICS 326199)

    Electrical insulators, Nisei

  • SITC: 77324

    Electrical insulators of material other than glass or ceramics

  • End Use: 20005

    Electric apparatus


P - Indicates there is no information in the hmirs. The nsn is in a fsc in table ii of federal standard 313 and a msds may be required by the user. The requirement for a msds is dependent on a hazard determination of the supplier or the intended end use of item.


U - Precious metal content is unknown


- The item does not have a nuclear hardened feature or any other critical feature such as tolerance, fit restriction or application.

Freight Information:
  • NMFC:

    103660 - Electric wire or wiring

  • WCC:

    658 - Electrical appliances, small

  • SHC:

    9 - Other or no special handling required (sh)

  • ADC:

    A - Shipment is not a consolidation and does not exceed 84 inches in any dimension.

  • ACC:

    H - Instruments/equipment/supplies for radio, communications, electrical, laboratory, etc. (includes signal corps)

  • LTL:

    Z - No rating

  • TCC:

    Z - No special type of cargo code applicable

NSN Management Codes:
  • SOS
  • AAC
  • Quantity per pack
    No qup
  • Unit of Measure
  • Shelf Life
  • Classification Control
  • Repariability
    This is a nonreparable item. if condemned or economically unserviceable, then dispose at the level authorized replace the item.

Questions & Answers:

What are the historical prices recorded for this stock number?
Historical data shows pricing from $18.55 to $30.92..
Does NSN 5970-00-224-5228 have a shelf life?
No. There is no shelf life applicable for this NSN.
What NATO entities are users of this NSN?
Republic Of Korea, and Greece
What is the NIIN of NSN 5970-00-224-5228?
002245228 or 00-224-5228
Does NSN 5970-00-224-5228 require demilitarization?
Yes - ITAR Controlled
What is the most recent solicitation for NSN 5970-00-224-5228?
No solicitations for this NSN.
When was this national stock number assigned to the federal catalog?
Jan 01, 1963