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Retaining Ring

NSN: 5325-00-942-2190 | Model: M5131-21H
ITAR Registered seal

A resilient metal item, circular or nearly circular, which is designed to be inserted into an internal or external groove and retained by its own spring action, or it may have external prongs or projections designed to be inserted into a hole and retained by spring action of the prongs which grip by imbedding into the material. For items having internal prongs which perform the same function, see push on nut. It is used to keep and/or lock a par (s) in position, as a ball bearing on a shaft or in a housing. See also clip, retaining and pin, lock. Excludes ring, connecting, round.

NSN Properties and Flags
NATO Stock Number
Yes - ITAR Controlled
Cross Sectional Shape
Inside Diameter
0.185 inches
Casehardening Indicator
Not casehardened
Major Thickness
0.015 inches
Ring Style
E bowed
Usage Design
Material Hardness Rating
Between 82.5 rockwell superficial 15-n and 86.0 rockwell superficial 15-n
End Play Takeup
0.025 inches
Steel, ams 5520
Steel comp 632
Material Specification
Ams 5520 assn standard single material response
Surface Treatment
Surface Treatment
Passivated, qq-p-35
Recent Solicitations
Solicitation Return by Date Buyer Code Quantity
SPE5E419T216N 2019-09-12 PHPHB 731 EA

Pricing and Availability

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NSN 5325-00-942-2190 Datasheet

Supply Class (FSC):
Fastening Devices
Cross Reference:
  • M5131-21H
  • X5131-21W
  • MS16634-4021
  • X5131-21H
  • 5131-21-H
  • X5131-21H
  • 5131-21-H
  • B18.27R273NACS021NN119NNQA1
Cage Codes:
  • Truarc Company Llc (CAGE 79136)
  • Military Standards (CAGE 96906)
  • Rotor Clip Company Inc. (CAGE 07382)
  • American Society Of Mechanical (CAGE 05047)
Schedule B & Trade:
  • Schedule B: 9606100000 (NAICS 339993)

    Press-fasteners, snap-fasteners & press-studs & parts therefor

  • SITC: 89983

    Press-fasteners, snap-fasteners and press-studs and parts therefor; buttons

  • End Use: 12640

    Finished textile supplies


N - Indicates there is no data in the hmirs and the nsn is in a fsc not generally suspected of containing hazardous materials.


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:

    095190 - Hardware, noi sub 9

  • WCC:

    713 - Metal hardware

  • 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:

    B - Construction materials: includes paint and related materials, prefabricated building, wood products, metal and composition mater

  • LTL:

    Q - 70.0

  • TCC:

    Z - No special type of cargo code applicable

NSN Management Codes:
  • SOS
  • AAC
  • Quantity per pack
  • Unit of Measure
  • Shelf Life
  • Classification Control
  • Repariability

Questions & Answers:

What are the historical prices recorded for this stock number?
Historical data shows pricing from $1.86 to $3.11..
Does NSN 5325-00-942-2190 have a shelf life?
No. There is no shelf life applicable for this NSN.
What NATO entities are users of this NSN?
Department Of The Air Force, Department Of The Navy, Australia, Republic Of Korea, and Turkey
What is the NIIN of NSN 5325-00-942-2190?
009422190 or 00-942-2190
Does NSN 5325-00-942-2190 require demilitarization?
Yes - ITAR Controlled
What is the most recent solicitation for NSN 5325-00-942-2190?
Solicitation SPE5E419T216N for qty 731 on 09/05/2019
When was this national stock number assigned to the federal catalog?
Dec 21, 1965