Engineers Edge
The use of split lock washers
Post Reply   Forum
Posted by: CCR5600Design

11/13/2007, 11:03:43

Author Profile
eMail author
Edit

Over the course of the past few years, one of our major customers has eliminated the use of split lock washers from their installation procedures claiming the tendency of said washers to fail under seismic loads. Many of our other customers have asked for the split lock washers to be included in the same assemblies which they purchase for their use.

First, what if any evidence has been found to prove that split lock washers are prone to failure during seismic occurances and

Second, Since it is the responsibility of the customer to install and assemble the product in the field in accordance with their own quality standards, could the washers be provided and simply left out of the assembly by the installer?

What are your takes on this situation? I am trying to put together a proposal that will encompass the majority of our customers with minimal part numbers to generate.

Thanks,

Ron





"What we need are more people who specialize in the impossible." - Theodore Roethke


Post Reply
Tell a Friend (must be logged in)
Alert Admin About Post
View All   | Next |

Replies to this message

: The use of split lock washers
: The use of split lock washers -- CCR5600Design Post Reply Top of thread Forum
Posted by: Kelly Bramble

11/13/2007, 11:48:54

Author Profile
eMail author
Edit

Interesting, "First, what if any evidence has been found to prove that split lock washers are prone to failure during seismic occurrences" I think this is a question you should pose (politely) to the customer as there could be an important lesson here. I wonder what they have done to replace the function of the split washers.

"Second, since it is the responsibility of the customer to install and assemble the product in the field in accordance with their own quality standards, could the washers be provided and simply left out of the assembly by the installer?"

Of course! Installers leave stuff out all the time. This is where quality personnel earn their money when critical applications are involved. The customer could re-specifiy the installation with an exception for the split washers.

Let us know what your conclusions are!








Post Reply
Tell a Friend (must be logged in)
Alert Admin About Post
Where am I? Original Top of thread | |
: : The use of split lock washers
: : The use of split lock washers -- Kelly Bramble Post Reply Top of thread Forum
Posted by: Marky

11/13/2007, 12:16:16

Author Profile
eMail author
Edit

Ron,

I usually call out for a kep nut or a sems screw with the lock washer already in place. It prevents the "I didn't think that we needed theory" that I usually hear.





I'll kindly pay you Tuesday..for a hamburger today....Whimpy


Post Reply
Tell a Friend (must be logged in)
Alert Admin About Post
Where am I? Original Top of thread | |
: : : The use of split lock washers
: : : The use of split lock washers -- Marky Post Reply Top of thread Forum
Posted by: CCR5600Design

11/13/2007, 12:32:24

Author Profile
eMail author
Edit

Marky,

The only drawback to keps nuts are the external teeth of the captive lockwasher. For the installations we encounter, external tooth lock washers are prohibited for safety reasons relating to possible snag hazards. Thanks for the input, though.

Ron





"What we need are more people who specialize in the impossible." - Theodore Roethke


Post Reply
Tell a Friend (must be logged in)
Alert Admin About Post
Where am I? Original Top of thread | |
: : : : The use of split lock washers
: : : : The use of split lock washers -- CCR5600Design Post Reply Top of thread Forum
Posted by: Marky

11/13/2007, 13:13:12

Author Profile
eMail author
Edit

Thanks Ron....never knew that.

I learned something today....I can go home now.





I'll kindly pay you Tuesday..for a hamburger today....Whimpy


Post Reply
Tell a Friend (must be logged in)
Alert Admin About Post
Where am I? Original Top of thread

Powered by Engineers Edge

© Copyright 2000 - 2015, by Engineers Edge, LLC All rights reserved.  Disclaimer