Heat shrinkable Teflon tubing is cut to size, slipped onto shaft, heated to shrink tightly to shaft, or machined to final outside diameter size. Shaft bushings fabricated from shrinkable Teflon tubing provide economic close fitting sleeves that prevent galling and contamination in valves

Spencer, E. O.

English

NASA Technical Reports Server

December 1972	 B72-10359 
•	
NASA TECH BRIEF 
Lewis Research Center
	 w 
NASA Tech Briefs announce new technology derived from the U.S. space program. They are issued to encourage 
commercial application. Tech Briefs are available on a subscription basis from the National Technical Information 
Service, Springfield, Virginia 22151. Requests for individual copies or questions relating to the Tech Brief program may 
be directed to the Technology Utilization Office, NASA, Code KT, Washington, D.C. 20546. 
Low Cost Anti-Galling Bushings 
E
Shaft bushings fabricated from heat shrinkable Teflon 
tubing provide close fitting Teflon sleeves which are 
easily applied to shaft bearing surfaces without precision 
machining of either the shafts or bushings. Com-
mercially available expanded Teflon tubing of appropri-
ate size is simply cut to length, slipped onto the shaft, 
heated to shrink it tightly to the shaft, and when 
necessary, machined only to size the final outside 
diameter. 
The heat shrinkable tubing can be used either to add 
protective sleeves between metal parts or as easily 
installed, inexpensive replacements for conventional 
machined plastic bushings. Installed on rotating or 
sliding shafts, the tubing prevents metal-to-metal contact 
which causes wear, galling, contamination, and even 
failure. It has been used successfully in valves, in lieu 
of machined plastic bushings, to eliminate failure caused 
by galling and contamination.
Note: 
No further documentation is available. Specific ques-
tions, however, may be directed to: 
Technology Utilization Officer 
Lewis Research Center 
21000 Brookpark Road 
Cleveland, Ohio 44135 
Reference: B72-10359 
Patent status: 
NASA has decided not to apply for a patent. 
Source: E. 0. Spencer of

North American Rockwell Corp.

under contract to

Lewis Research Center

(LEW-1 1724) 
Category 08 
This document was prepared under the sponsorship of the National -	 Government assumes any liability resulting from the use of the 
Aeronautics and Space Administration. Neither the United States
	 information contained in this document, or warrants that such use 
Government nor any person acting on behalf of the United States
	 will be free from privately owned rights.
I
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Low cost anti-galling bushings

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