21-018-31-16

View detailed technical data, stock status, and sourcing information for: 21-018-31-16
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Federal Supply Group

Bearings

Federal Supply Classification

3120 Unmounted Plain Bearings

National Stock Number

3120-01-048-6641

Item Name Code

13206

Assigment Date

10/02/1977 (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.

chamfered inside left corner corner shape, chamfered inside right corner corner shape, 1.1265 inches minimum and 1.1270 inches maximum body outside diameter, 0.4970 inches minimum and 0.5030 inches maximum overall length, 0.9683 inches minimum and 0.9693 inches maximum body inside diameter

Product Characteristics

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

Overall Length: 0.4970 inches minimum and 0.5030 inches maximum
Body Outside Diameter: 1.1265 inches minimum and 1.1270 inches maximum
Body Inside Diameter: 0.9683 inches minimum and 0.9693 inches maximum
Corner Shape: chamfered inside left corner
Corner Shape: chamfered inside right corner
Corner Shape: square outside left corner
Corner Shape: square outside right corner
Hardness Rating: 26.0 rockwell c minimum and 33.0 rockwell c maximum overall
Surface Finish: 125.0 microinches inside diameter surface of body
Surface Finish: 125.0 microinches left end surface of body
Surface Finish: 125.0 microinches right end surface of body
Surface Finish: 32.0 microinches outside diameter surface of body
Material: steel comp 4140 or steel comp 8740 or steel comp 8630 or steel comp 4130 overall
Surface Treatment: cadmium overall
Surface Treatment Document And Classification: qq-p-416,ty 2,cl 2 fed spec single treatment response overall
Style Designator: solid, plain, no outside flanges

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
21-018-31-16	Sleeve Bushing

FAQs

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

What is the FSCG of the NSN 3120-01-048-6641?

The FSCG of the NSN 3120-01-048-6641 is 3120

Does the NSN 3120-01-048-6641 have a Schedule B code assigned?

Yes, the Schedule B code is 8482997060

Does NSN 3120-01-048-6641 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 3120-01-048-6641 contain precious materials?

Item does not contain precious metal.

Does NSN 3120-01-048-6641 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 3120-01-048-6641 was assigned to the Federal Catalog?

It was assigned 48 years ago, on Sun, Oct 2, 1977