Home » FSC Catalog » Bearings, Plain, Unmounted » 3120-00-079-9974

Self-aligning Plain Bearing

SKU: 3120000799974 | Model: MS21231-5
NSN 3120-00-079-9974 NSN 3120-00-079-9974

0.3120" bore diameter, 23.0 Rockwell c outer race member hardness rating, steel comp 440C inner member material, without insert or liner

Specifications from the Manufacturer

Bore Diameter:
0.3120 inches minimum and 0.3125 inches maximum
Outer Member Outside Diameter:
0.6870 inches minimum and 0.6875 inches maximum
Outer Member Width:
0.3120 inches minimum and 0.3220 inches maximum
Inner Member Width:
0.4350 inches minimum and 0.4370 inches maximum
Static Radial Load Rating:
9400 pounds
Hardness Rating:
23.0 rockwell c minimum outer race member
Hardness Rating:
55.0 rockwell c minimum inner member
Steel comp 440c 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:


Cross Reference:

  • MS21231-5
  • MILB8942

Cage Codes:

  • Military Standards (CAGE 96906)
  • Military Specifications (CAGE 81349)

Replaced or Cancelled:

3120-00-079-9974 is not a replacement of any national stock number and has not been cancelled or replaced itself.


NIIN: 000799974
NSN: 3120000799974
DEMIL Code Meaning: Non-usml/non-ccli - no demil or dod tsc required. department of commerce may impose licensing requirements to certain destinations.

Freight Codes:

NMF Desc: Bearings/bushings Noi Ball/roller
NMFC: 114820
UFC: 58860
LTL: 77.5
LCL: 77.5
WCC: Bearings
TCC: No special type of cargo code applicable
SHC: Other or no special handling required (sh)
ADC: Shipment is not a consolidation and does not exceed 84 inches in any dimension.
ACC: Trailers, vehicles, machinery, shop and warehouse equipment and supplies including special tools and equipment, ground servicing
ASH: No special handling required.

Reference Drawing:

[drawing of 3120-00-079-9974]

Schedule B & Trade:

8482300040 (NAICS 332991)
Spherical roller bearings, single row

Spherical roller bearings

End Use:

Industrial machines, other

Questions & Answers:

What are the historical prices recorded for this stock number?
No pre-dated pricing for this NSN could be found.
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?
Korea, Republic Of
How is national stock number 3120-00-079-9974 defined?
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.
What is the NIIN of NSN 3120-00-079-9974?
000799974 or 00-079-9974
Does this item require Demilitarization?
Non-usml/non-ccli - no demil or dod tsc required. department of commerce may impose licensing requirements to certain destinations. (note 9).
Is NSN 3120000799974 ITAR controlled?
No. This item is not ITAR Controlled.
What is the most recent solicitation for NSN 3120000799974?
No solicitations for this NSN.
When was this national stock number assigned to the federal catalog?
Dec 13, 1967