MS21243-4

View detailed technical data, stock status, and sourcing information for: MS21243-4
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Federal Supply Group

Bearings

Federal Supply Classification

3120 Unmounted Plain Bearings

National Stock Number

3120-01-055-3958

Item Name Code

13209

Assigment Date

02/04/1978 (48 years ago)

An item of any peripheral shape usually having one flat or spherical surface and a centrally located hole. It is designed for applications involving moving (kinetic) loads. Except for items fabricated from bearing quality synthetic (plastic) or composed of multilayer material, one bearing surface must either have a specific surface finish designation of 32 microinch (0.8 micrometre) or less, arithmetical average (aa) (arithmetic mean deviation) or one of the following conditions: be lapped or ground; have visible or detectable means of lubrication; grooves, indentations; or self-lubrication. The thickness must not exceed 25 percent of the outside diameter of the shortest distance between peripheral flats (when thickness and/or outside diameter is designated as a tolerance dimension, the maximum dimension will be used to determine compliance). Excludes:straight, tubular (without flange) items having a bearing surface(s) parallel to the axis of the bore only. See also washer, flat and spacer, sleeve.

3b thread class, right-hand thread direction, 1.8570 inches minimum and 1.8870 inches maximum overall length, 0.2495 inches minimum and 0.2500 inches maximum bore diameter, internally threaded w/ hexagon end shank style

Product Characteristics

Below you’ll find the complete technical specifications and performance data for this part, including material details and compliance information.

Thread Class: 3b
Thread Direction: right-hand
Shank Style: internally threaded w/ hexagon end
Overall Length: 1.8570 inches minimum and 1.8870 inches maximum
Bore Diameter: 0.2495 inches minimum and 0.2500 inches maximum
Outer Member Outside Diameter: 0.7960 inches minimum and 0.8160 inches maximum
Bore Center To Shank End Distance: 1.4590 inches minimum and 1.4790 inches maximum
Outer Member Width: 0.3320 inches minimum and 0.3420 inches maximum
Inner Member Width: 0.4320 inches minimum and 0.4370 inches maximum
Shank Thread Length: 0.7500 inches minimum
Shank Width Across Wrench Flats: 0.4270 inches minimum and 0.4390 inches maximum
Static Radial Load Rating: 4860 pounds
Thread Diameter: 0.312 inches nominal
Thread Quantity Per Inch: 24
Special Features: keyslot for nas559 lock in shank
Material: steel comp 440c inner member
Material Document And Classification: ams 5643 assn std single material response inner member
Style Designator: ball type
Thread Series Designator: unjf

Replaces National Stock Numbers

Below is a list of NSNs that have been officially superseded by this NSN:

NSN	Name	Date
3120-00-089-5022	No Name Available	03/01/1991
3120-01-043-5885	No Name Available	07/01/1980

Related Parts

This NSN group includes multiple components designed to meet specific performance and operational standards. Each listing provides detailed specs, functionality data, and replacement compatibility information:

Part Number	Name
60-7794-413	Rod End Plain Bearing
9446112413	Rod End Plain Bearing
AS81935/2	Rod End Plain Bearing
M81935/2-04	Rod End Plain Bearing
M81935/2-4	Rod End Plain Bearing
MS21243-4	Rod End Plain Bearing
MS21243S04	Rod End Plain Bearing

FAQs

Find helpful answers about installation, operation, maintenance, compliance, and troubleshooting.

What is the FSCG of the NSN 3120-01-055-3958?

The FSCG of the NSN 3120-01-055-3958 is 3120

Does the NSN 3120-01-055-3958 have a Schedule B code assigned?

Yes, the Schedule B code is 8483308055

Does NSN 3120-01-055-3958 require demilitarization?

Items subject to the export administration regulations (ear) in parts 730-774 of title 15, code of federal regulations (cfr) (ccli or ear99) and determined by dod to present a low risk when released out of dod control. No demil, mut, or end use certificate is required. May require an export licensefrom doc.

Does NSN 3120-01-055-3958 contain precious materials?

Precious metal content is unknown

Does NSN 3120-01-055-3958 contain hazardous materials?

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

When the NSN 3120-01-055-3958 was assigned to the Federal Catalog?

It was assigned 48 years ago, on Sat, Feb 4, 1978