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  #1  
Old 01-21-2019, 08:43 PM
wjb's Avatar
wjb wjb is offline
 
Join Date: Nov 2012
Location: Half Moon Bay, CA
Posts: 1,121
Default Why not more Nord-Lock washers?

I've been wondering for some time why Nord-lock type washers are not used on our birds. They have a neat design that uses tension in the washer to rather than friction in the locking nut to provide the locking action. They are touted to be particularly good in high vibration environments. Interesting video here: https://www.youtube.com/watch?v=IKwWu2w1gGk

I finally came across a set in my Matco brakes; the AN4 bolts that hold the pad opposite the plunger have Nord-like type washers. It's a bolt into a blind hole, so safety wire or Nord-locks are the only way to secure them.

My question to the VAF brain trust: Why aren't these washers used more frequently? On my IO-360, all the bolts use the ancient star washers as "lock washers." It sure seems they get smashed down pretty flat after one use. Is it the price?, love of pre Wright bro's technology, or some other reason(s)?
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Last edited by wjb : 01-21-2019 at 09:05 PM.
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  #2  
Old 01-21-2019, 09:03 PM
swjohnsey swjohnsey is offline
 
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Location: Kingsville, TX
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Default

Very impressive.
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  #3  
Old 01-21-2019, 09:13 PM
gasman gasman is offline
 
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Location: Sonoma County
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Default

Quote:
Originally Posted by wjb View Post
I've been wondering for some time why Nord-lock type washers are not used on our birds. They have a neat design that uses tension in the washer to rather than friction in the locking nut to provide the locking action. They are touted to be particularly good in high vibration environments. Interesting video here: https://www.youtube.com/watch?v=IKwWu2w1gGk

I finally came across a set in my Matco brakes; the AN4 bolts that hold the pad opposite the plunger have Nord-like type washers. It's a bolt into a blind hole, so safety wire or Nord-locks are the only way to secure them.

My question to the VAF brain trust: Why aren't these washers used more frequently? On my IO-360, all the bolts use the ancient star washers as "lock washers." It sure seems they get smashed down pretty flat after one use. Is it the price?, love of pre Wright bro's technology, or some other reason(s)?
Star washers are to be used only one time, then tossed. They are also cheaper.
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  #4  
Old 01-21-2019, 09:14 PM
Chkaharyer99 Chkaharyer99 is offline
 
Join Date: Oct 2011
Location: Pilot Hill, CA
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I used Nord washers at the recommendation of B&C to mount my B&C starter to my IO-360. I replaced a broken SkyTec.

Cool video. Thanks
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  #5  
Old 01-22-2019, 12:27 AM
lr172 lr172 is offline
 
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Location: Schaumburg, IL
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because they weren't around 50 or 70 years ago when the conventions were set. If you haven't noticed, aviation folks are some of the most resistant to change that I have ever met. I suspect much stems from the regulatory issues. We still frown on people that have moved on from the tractor mags that we call "aviation grade."

Larry
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  #6  
Old 01-22-2019, 04:08 AM
pulsar pulsar is offline
 
Join Date: Sep 2018
Location: NY
Posts: 35
Default They work really well

A colleague of mine coined the acronym NDS meaning: New, Diferent, Scary. It describes well the engineering world (not just aviation). Why we don?t use them... perhaps institutional momentum, but I can attest that nordlocks work and they work very well. These days I design systems that go into some of the most severe vibration environments around (high temperatures, with repeated short-duration accelerations well above 1000g) and nordlocks are our go-to. What we design are system-critical components where a failure can have life-ending consequences and I?ll sometime need to stand next to the thing while it?s operating so you bet your backside the nordlocks better work. I don?t ever trust promotional stuff about products, but in this case they work.
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  #7  
Old 01-22-2019, 06:21 AM
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Piper J3 Piper J3 is offline
 
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Nord-Lock is used on my Sensenich ground-adjustable prop on RV-12.

Perfect application...
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  #8  
Old 01-22-2019, 06:27 AM
GWZ GWZ is offline
 
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Location: Greenfield, IN
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After watching the video it looks like they damage the material being clamped. Would they still work if there was a flat washer under them?
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  #9  
Old 01-22-2019, 06:45 AM
pulsar pulsar is offline
 
Join Date: Sep 2018
Location: NY
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Default Grip

Quote:
Originally Posted by GWZ View Post
Would they still work if there was a flat washer under them?
No. They need to grip into the base material and the underside of the fastener?s head in order to prevent rotation of the fastener.
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  #10  
Old 01-22-2019, 06:59 AM
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bret bret is offline
 
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Location: Gardnerville Nv.
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We use these on our Sno-Cat track tension lock nuts, 1" dia. extremely difficult to loosen. Yes, they work!
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