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Self-aligning Plain Bearing

NSN: 3120-00-079-9974 | Model: MS21231-5
ITAR Registered seal

A detachable assembly in or on which a journal, gudgeon, pivot, or the like moves. It is used to carry a load and to reduce sliding friction. It does not employ rolling elements. The item consists of a bored precision ground ball (or spherical plain bearing) around which an outer ring is fitted. The assembly may be either separable or nonseparable. Excludes bearing, plain, rod end and bearing, plain, spherical.

NSN Properties and Flags
NATO Stock Number
Yes - ITAR Controlled
Bore Diameter
Between 0.3120 inches and 0.3125 inches
Outer Member Outside Diameter
Between 0.6870 inches and 0.6875 inches
Outer Member Width
Between 0.3120 inches and 0.3220 inches
Inner Member Width
Between 0.4350 inches and 0.4370 inches
Static Radial Load Rating
9400 pounds
Hardness Rating
55.0 Rockwell c inner member
Steel outer race member
Style Designator
Without insert or liner

Pricing and Availability

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NSN 3120-00-079-9974 Datasheet

Supply Class (FSC):
Unmounted Plain Bearings
Cross Reference:
  • MS21231-5
  • MILB8942
Cage Codes:
  • Military Standards (CAGE 96906)
  • Military Specifications (CAGE 81349)
Schedule B & Trade:
  • Schedule B: 8482300040 (NAICS 332991)

    Spherical roller bearings, single row

  • SITC: 74630

    Spherical roller bearings

  • End Use: 21180

    Industrial machines, other


N - Indicates there is no data in the humors 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:

    114820 - Bearings/bushings noi ball/roller

  • WCC:

    742 - Bearings

  • 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.

  • LCL:

    P - 77.5

  • LTL:

    P - 77.5

  • ACC:

    V - Trailers, vehicles, machinery, shop and warehouse equipment and supplies including special tools and equipment, ground servicing

  • 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 $21.67 to $36.11..
Does NSN 3120-00-079-9974 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 Denmark
What is the NIIN of NSN 3120-00-079-9974?
000799974 or 00-079-9974
Does NSN 3120-00-079-9974 require demilitarization?
Yes - ITAR Controlled
What is the most recent solicitation for NSN 3120-00-079-9974?
No solicitations for this NSN.
When was this national stock number assigned to the federal catalog?
Dec 13, 1967