snap ring

noun Machinery.
any of various kinds of metal rings that must be forced open to be used and snap back into place to make a snug fit.

Origin:
1900–05

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Based on the Random House Dictionary, © Random House, Inc. 2014.
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Collins
World English Dictionary
snap ring
 
n
mountaineering another name for karabiner

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Example sentences
When the latch was moved axially toward the snap ring it would bind at that
  point.
All hydrants shall contain a removable head strainer and stainless steel snap
  ring that can be removed without special tools.
The check valve components will flow into the lift cylinder if the snap ring
  fails.
Snap ring failure could cause landing gear up-lock failure.
Image for snap ring
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