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Retaining Ring

NSN: 5325-01-201-4778 | Model: MS16625-4306

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
Cross Sectional Shape
Casehardening Indicator
Not casehardened
Outside Diameter
Between 3.363 inches and 3.473 inches
Major Thickness
Between 0.1098 inches and 0.1120 inches
Ring Style
Usage Design
Material Hardness Rating
Between 45.0 rockwell c and 52.0 rockwell c
Steel, ams 5520
Steel comp 632
Material Specification
Ams 5520 assn standard single material response
Surface Treatment
Surface Treatment Specification
Qq-p-35 federal specification single treatment response
Surface Treatment
Passivated, qq-p-35
Recent Solicitations
Solicitation Return by Date Buyer Code Quantity
SPE5E420T5617 2020-02-28 PHPHB 36 EA

Inventory Check

The last inventory check on this NSN was done on 07/21/2021. Due to rapid changes in inventory this may not be the current stock qty.

  • New: 3
  • New Surplus: 10

Pricing and Availability

Send us a request for quote using the form below. Our team will contact you with an up to date pricing and availability quote ASAP.

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NSN 5325-01-201-4778 Datasheet

Supply Class (FSC):
Fastening Devices
Cross Reference:
  • MS16625-4306
  • 1213E2815 FIND 61
  • 1213E2815 FIND 61
Cage Codes:
  • Military Standards (CAGE 96906)
  • Lockheed Martin Corporation (CAGE 03538)
  • Martin Marietta Technologies Inc (CAGE 54497)
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.


A - Item does not contain precious metal.


- 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 $39.93 to $66.56..
Does NSN 5325-01-201-4778 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 Navy, Poland, Spain, Canada, Greece, and Turkey
What is the NIIN of NSN 5325-01-201-4778?
012014778 or 01-201-4778
Does NSN 5325-01-201-4778 require demilitarization?
Yes - ITAR Controlled
What is the most recent solicitation for NSN 5325-01-201-4778?
Solicitation SPE5E420T5617 for qty 36 on 02/21/2020
When was this national stock number assigned to the federal catalog?
Feb 18, 1985