Improved nut and sleeve of standard stainless steel flared tube connection allows forces on the mating surfaces to be uniformly applied. This can be applied to pressurized fluid systems such as refrigeration, air conditioning, and hydraulic systems

Garrard, J. S.

English

NASA Technical Reports Server

Fitting 
Tubing 
C--R--
 ^
June 1965	 Brief 65-10180 
.
	
NASA TECH BRIEF H 
NASA Tech Briefs are issued by the Technology Utilization Division to summarize specific 
technical innovations derived from the space program. Copies are available to the public from 
the Clearinghouse for Federal Scientific and Technical Information, Springfield, Virginia, 22151. 
New Nut and Sleeve Improve Flared Connections 
--	 ni.
The problem: In standard stainless steel flared tube 
connections, nonconcentricity and misalignment of 
the tube flare in relation to the fitting is frequently en-
countered. These conditions contribute to a poor seal 
and short component life because the forces on the 
mating surfaces of the tube and fitting are not uni-
formly applied. 
The solution: An improved nut and sleeve that 
allow forces on the mating surfaces to be uniformly 
applied. 
How it's done: The redesigned nut and sleeve pro-
vide for a spherical mating surface between the two as 
opposed to the plane mating surfaces of a standard 
nut and sleeve. This spherical surface creates a better 
connection between the tube and fitting in the case of 
a nonconcentric or misaligned flare on the tube. With 
uniform compression of the tubing, the seal is greatly 
improved and component life is increased significantly.
Notes: 
1. The improved nut and sleeve mate with standard 
fittings. 
2. This innovation should be of interest to manufac-
turers of pressurized fluid systems such as refrig-
eration and air conditioning and hydraulic systems. 
Inquiries concerning this innovation may be di-
rected to: 
Technology Utilization Officer 
Marshall Space Flight Center 
Huntsville, Alabama, 35812 - 
Reference: B65-10180 
Patent status: NASA encourages commercial use

of this innovation. No patent action is contemplated.

Source: J. S. Garrard

(M-FS- 194)
Category No. 05 
This document was prepared under the sponsorship of the National 
Aeronautics and Space Administration. Neither the United States Govern-
ment, nor NASA, nor any person acting on behalf of NASA: A. Makes 
any warranty or representation, express or implied, with respect to the 
accuracy, completeness, or usefulness of the information contained in
this document, or that the use of any information, apparatus, method, 
or process disclosed in this document may not infringe privately-owned 
rights; or B. Assumes any liabilities with respect to the use of, or for 
damages resulting from the use of, any information, apparatus, method, 
or process disclosed in this document.
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New nut and sleeve improve flared connections

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