nylock vs. lock washer...which is best? - The 1947 - Present Chevrolet & GMC Truck Message Board Network

weq92f · 10-05-2024, 11:48 AM

.

Kinda surprising results...

https://www.youtube.com/watch?v=pDZ8PezMzzY

What if you use both at the same time...

https://www.youtube.com/watch?v=Iao2HT71kB8

-Kevin

**Steeveedee** · 10-05-2024, 12:18 PM

Not surprising that the lock washer case came loose. The washer wasn't completely compressed. He should have done this test with the recommended torque of 31 Ft-Lbs for this type fastener.

weq92f · 10-05-2024, 12:48 PM

.

Agreed...more torque would have definitely made a difference. The video is far more interesting at 6lbs though!

Another issue that stands out is...those nylock nuts I've dealt with required more than 6lbs just to turn so trying to torque them down at such a low value seems inaccurate at best.

-Kevin

**truckster** · 10-05-2024, 12:56 PM

I actually posted that as a comment in the video when I first saw it. It's impossible to test a fastener's holding power unless it's properly torqued.

**Steeveedee** · 10-05-2024, 01:57 PM

Quote:

Originally Posted by weq92f

.

Agreed...more torque would have definitely made a difference. The video is far more interesting at 6lbs though!

Another issue that stands out is...those nylock nuts I've dealt with required more than 6lbs just to turn so trying to torque them down at such a low value seems inaccurate at best.

-Kevin

Right, he completely ignored the running torque of the nylock nut.

LS short box · 10-05-2024, 04:32 PM

On my hot rod projects I use grade 8 bolts and grade 8 nylocks. One of the reasons I use nylocks is that when you use a washer it doesn't crack the paint or powder coat. Never had one come loose.

jjzepplin · Yesterday, 07:28 AM

I am sort of a redneck and grew up on a farm. Each type of bolt has it's rightful place to be used. If a nylock gets hot it's not going to hold the same. I like lock bolts but they bugger the threads after the first use. I use lock washers if I run out of nylock bolts and can't get to the store. I used to take a standard bolt and put it on a vise and bang it with a hammer to make it slightly out of round and boom-lock bolt. I have always wondered how a lock washer on top of a standard washer holds with a standard bolt.

**HO455** · Yesterday, 03:47 PM

Caterpillar machinery quit using lock washers many decades ago. They use grade 8 fasteners and under every nut or bolt head, there is a hardened flat washer. Some fasteners are required to have Loctite.

If you ever have an opportunity to buy a junk Cat engine for cheap, do it the as fasteners are some of the best around.

**71CHEVYSHORTBED402** · Yesterday, 06:54 PM

Quote:

Originally Posted by Steeveedee

Not surprising that the lock washer case came loose. The washer wasn't completely compressed. He should have done this test with the recommended torque of 31 Ft-Lbs for this type fastener.

agree.

I wonder if he's tested torque nuts? Bet they beat nylon/split washer to )_&_&+, though been wrong before.

**Steeveedee** · Yesterday, 08:46 PM

OK, I had to go look that up. I've seen those used on truly ancient MOPAR products, like my dad's '51 Dodge truck- "ancient" meaning that that truck was one year older than I. Dodge Bros did things a bit differently, like left hand threads on the left side of the vehicle. They may have worked better, I have no idea.

I note that cotter pins are far more common now, and MOPAR has gone to all right hand threads(?).

**kwmech** · Today, 11:44 AM

Moot point and a waste of a video and everybodys time if the fastener was not torqued to specs

10-05-2024, 11:48 AM	#1
weq92f Registered User Join Date: Oct 2016 Location: Dallas Texas Posts: 3,118	nylock vs. lock washer...which is best? . Kinda surprising results... https://www.youtube.com/watch?v=pDZ8PezMzzY What if you use both at the same time... https://www.youtube.com/watch?v=Iao2HT71kB8 -Kevin __________________ 67 C10 fleet fuel injected '70 402, 700r4, 3.73 posi 07 335 sport turbo 6sp 94 Trans Am GT LT1 6sp posi -- sold after 22yrs 99 540 sport V8 6sp -- sold 73 240z L24 4sp -- given to friend 68 C10 step 350/350 3.73 open -- sold

10-05-2024, 12:18 PM	#2
Steeveedee Who Changed This? Join Date: Jan 2013 Location: Simi Valley, CA Posts: 10,527	Re: nylock vs. lock washer...which is best? Not surprising that the lock washer case came loose. The washer wasn't completely compressed. He should have done this test with the recommended torque of 31 Ft-Lbs for this type fastener. __________________ ~Steven '70 Chevy 3/4T Longhorn CST 402/400/3.56 Custom Camper Simi Valley, CA

10-05-2024, 12:48 PM	#3
weq92f Registered User Join Date: Oct 2016 Location: Dallas Texas Posts: 3,118	Re: nylock vs. lock washer...which is best? . Agreed...more torque would have definitely made a difference. The video is far more interesting at 6lbs though! Another issue that stands out is...those nylock nuts I've dealt with required more than 6lbs just to turn so trying to torque them down at such a low value seems inaccurate at best. -Kevin __________________ 67 C10 fleet fuel injected '70 402, 700r4, 3.73 posi 07 335 sport turbo 6sp 94 Trans Am GT LT1 6sp posi -- sold after 22yrs 99 540 sport V8 6sp -- sold 73 240z L24 4sp -- given to friend 68 C10 step 350/350 3.73 open -- sold

10-05-2024, 12:56 PM	#4
truckster Senior Member Join Date: Jan 2001 Location: Orem, Utah Posts: 7,941	Re: nylock vs. lock washer...which is best? I actually posted that as a comment in the video when I first saw it. It's impossible to test a fastener's holding power unless it's properly torqued. __________________ I have sworn upon the altar of God, eternal hostility against every form of tyranny over the mind of man. - Thomas Jefferson

10-05-2024, 04:32 PM	#6
LS short box Registered User Join Date: Jun 2015 Location: Carlos MN Posts: 2,079	Re: nylock vs. lock washer...which is best? On my hot rod projects I use grade 8 bolts and grade 8 nylocks. One of the reasons I use nylocks is that when you use a washer it doesn't crack the paint or powder coat. Never had one come loose.

Yesterday, 07:28 AM	#7
jjzepplin Registered User Join Date: Feb 2012 Location: Ruskin Florida Posts: 4,566	Re: nylock vs. lock washer...which is best? I am sort of a redneck and grew up on a farm. Each type of bolt has it's rightful place to be used. If a nylock gets hot it's not going to hold the same. I like lock bolts but they bugger the threads after the first use. I use lock washers if I run out of nylock bolts and can't get to the store. I used to take a standard bolt and put it on a vise and bang it with a hammer to make it slightly out of round and boom-lock bolt. I have always wondered how a lock washer on top of a standard washer holds with a standard bolt. __________________ 70 swb 4x4 406sbc 700r4 203/205 d60/14blt locker yadda yadda http://67-72chevytrucks.com/vboard/s...88#post6935688 Yeller 72 Blazer 2wd conversion project "No Daggum Money" http://67-72chevytrucks.com/vboard/s...d.php?t=550804 LS1-T56 3.73 LSD super budget build Blanco-2014 Sierra SWB https://67-72chevytrucks.com/vboard/...d.php?t=810350

Yesterday, 03:47 PM	#8
HO455 Post Whore Join Date: Feb 2016 Location: Portland Oregon Posts: 11,239	Re: nylock vs. lock washer...which is best? Caterpillar machinery quit using lock washers many decades ago. They use grade 8 fasteners and under every nut or bolt head, there is a hardened flat washer. Some fasteners are required to have Loctite. If you ever have an opportunity to buy a junk Cat engine for cheap, do it the as fasteners are some of the best around. __________________ Thanks to Bob and Jeanie and everyone else at Superior Performance for all their great help. RIP Bob Parks. 1967 Burban (the WMB),1988 S10 Blazer (the Stink10 II),1969 GTO (the Goat), 1970 Javelin, 1952 F2 Ford OHC six 4X4, 29 Model A, 72 Firebird (the DBP Bird). 85 Alfa Romeo If it breaks I didn't want it in the first place The WMB repair thread http://67-72chevytrucks.com/vboard/s...d.php?t=698377

Yesterday, 08:46 PM	#10
Steeveedee Who Changed This? Join Date: Jan 2013 Location: Simi Valley, CA Posts: 10,527	Re: nylock vs. lock washer...which is best? OK, I had to go look that up. I've seen those used on truly ancient MOPAR products, like my dad's '51 Dodge truck- "ancient" meaning that that truck was one year older than I. Dodge Bros did things a bit differently, like left hand threads on the left side of the vehicle. They may have worked better, I have no idea. I note that cotter pins are far more common now, and MOPAR has gone to all right hand threads(?). __________________ ~Steven '70 Chevy 3/4T Longhorn CST 402/400/3.56 Custom Camper Simi Valley, CA

Today, 11:44 AM	#11
kwmech Senior Member Join Date: Mar 2003 Location: Colfax-California Posts: 8,574	Re: nylock vs. lock washer...which is best? Moot point and a waste of a video and everybodys time if the fastener was not torqued to specs



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