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Do these nuts need lock washers? #5282076 12/01/19 02:36 PM
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atikovi Offline OP
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For an exhaust system. It's a captive washer that is free to spin on the nut.

[Linked Image from fototime.com]

Re: Do these nuts need lock washers? [Re: atikovi] #5282079 12/01/19 02:43 PM
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vw7674 Offline
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Given the length of those bolts, I would expect a couple of tensioning springs & washers would belong on the bolt-head side.
Usually see that arrangement near a down pipe to a catalytic converter.

Re: Do these nuts need lock washers? [Re: atikovi] #5282089 12/01/19 02:49 PM
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Warstud Offline
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If they came with them from the factory then Yes. They probably wouldn't have used them if it wasn't necessary.

Re: Do these nuts need lock washers? [Re: atikovi] #5282100 12/01/19 02:55 PM
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2strokeNorthstar Offline
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No. You can see those are not flat and act as a lock washer when tightened.


2001 F150 5.4L
2013 Nissan Juke Nismo
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1998 BMW 328i
Re: Do these nuts need lock washers? [Re: vw7674] #5282103 12/01/19 02:56 PM
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atikovi Offline OP
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Originally Posted by vw7674
Given the length of those bolts, I would expect a couple of tensioning springs & washers would belong on the bolt-head side.
Usually see that arrangement near a down pipe to a catalytic converter.


No, just the only pair of matching hardware I could find in my box of used nuts and bolts of the correct diameter. Between the two flanges and a gasket, there won't be all that much threads exposed after tightening the nuts.

Re: Do these nuts need lock washers? [Re: atikovi] #5282110 12/01/19 03:03 PM
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Jimkobb Offline
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No. I`m not nuts , but I don`t think so.


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Re: Do these nuts need lock washers? [Re: atikovi] #5282127 12/01/19 03:21 PM
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Lubener Offline
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I would bet those holes are egg shaped like a lock nut.


The "thinking" man's friend.
Re: Do these nuts need lock washers? [Re: Lubener] #5282133 12/01/19 03:30 PM
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Mainia Offline
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Originally Posted by Lubener
I would bet those holes are egg shaped like a lock nut.


Yep

Re: Do these nuts need lock washers? [Re: Lubener] #5282136 12/01/19 03:37 PM
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atikovi Offline OP
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Originally Posted by Lubener
I would bet those holes are egg shaped like a lock nut.


Nope

Re: Do these nuts need lock washers? [Re: atikovi] #5282139 12/01/19 03:40 PM
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bullwinkle Offline
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Those are spring washers on those nuts, they will flatten out when tightened & act like a spring style lockwasher.


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Re: Do these nuts need lock washers? [Re: bullwinkle] #5282182 12/01/19 04:29 PM
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Trav Offline
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Originally Posted by bullwinkle
Those are spring washers on those nuts, they will flatten out when tightened & act like a spring style lockwasher.

+1 They are a type of Belleville spring.


ASE L1, Master. Deutsch Meisterbrief.
Re: Do these nuts need lock washers? [Re: atikovi] #5282188 12/01/19 04:34 PM
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danez_yoda Offline
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put some high temp loctite if you are worried. Those bolts will probable rust up and make their own loctite after a few temperature cycles anyway.

The point of a lockwasher is to bite into the stationary material and bite into the nut to keep it stationary as well. in this case the screw both the nut and screw head can rotate due to vibration so you would need to essentially lock the nut to the screw. You can use Jam nuts by tightening a second nut over the first one and torque it against tie flange nut.

If it came from the factory that way and wasn't loose when you disassembled it I wouldn't reengineer it.

Re: Do these nuts need lock washers? [Re: atikovi] #5282244 12/01/19 05:40 PM
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atikovi Offline OP
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I was going to use anti-seize on the threads to make it easier for the next guy.

Re: Do these nuts need lock washers? [Re: atikovi] #5282258 12/01/19 06:00 PM
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mattd Offline
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Never use lock washers on exhaust parts. Use self locking nuts.


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Re: Do these nuts need lock washers? [Re: atikovi] #5282269 12/01/19 06:15 PM
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hallstevenson Offline
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It seems like most (many ??) flanged nuts like those have "knurling" on the underside of the flange that provides some locking action. Can't tell from the picture if those do though.

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