Anti-Vibration Rubber Isolator Mounts with Studs Shock Absorber, M8

Very good product. I ordered these for use on my Harbor Freight paint shaker 5 years ago and they worked perfectly reducing vibrations. The only reason they failed was because I didn't make sure the mounting nuts were tight the last time I used it. Keep the mounting nuts tight and they will last forever.

These work, noise is reduced to almost nothing at the bedroom above the garage. You are suspending a heavy vibrating motor on rubber isolators that are installed on shear so please be careful. They may pop out if not supported. After I installed 2, the isolators twisted and since they are just compressed rubber at the mounting bolts, over tightening them will shear off the rubber. I added a diagonal brace to each side of the opener to install 4 instead of 2 isolators. The 4 isolators made the install much more stable (no more twisting) and they can handle the weight of the motor long term. I added 1.5” X 5/8” washers to both sides of the isolators to help the bolts inside press against the rubber. I added locking washers to prevent the nuts from unscrewing without over tightening. And lastly I added a rubber bungee cord to help take some of the load off the isolators and provide extra insurance. To reduce the noise inside the garage I installed Noico (same as Dynamat) inside the opener housing.

I bought these in order to modify just one of them for another vibration dampening job. Since I had to hack away at the thing with a utiliity knive until I eventually halved the rubber donut, I can attest to how tough these suckers are; took me forever; note to self: Don't use a dull utility knive blade. Each threaded stud is independent and anchored with a wide flathead in a slot molded into the inside of the rubber rubber tube. Seemed like an exceptionally hardy construction to me, but I'm not much of a do-it-yourselfer.

Good thing about this unit is that you get four pieces. So if they turn out bad later or start wearing out, you have two more before you have to buy a new set. Overall it does the job, it quiets down the garage vibration and rumble into the bedroom upstairs. I did not test it using a decibel tester but I can tell it is much quieter. Maybe two times as much. Not very scientific but good enough. Another reviewer says to use some heavy duty zip ties to secure it so that it doesn't accidentally drop when those rubber fail later down the road. So I added two heavy duty straps, ensure it doesn't automatically just come down. Installation took about 30 minutes. I did use blue loctite on the threads to ensure that the nuts don't just loosen over time. Another option is to double nut it.

used on my fuel cell for my 83 c10 mounted in the bed. nothing has snapped yet with over 1000 miles

My rating is mostly for the effectiveness in reducing noise in our nursery above the garage. The sound of the garage door opening is now very subtle. I was very reluctant that these would work well. I assumed there was a single bolt that went through the bushing and it would still transfer vibration, but the rubber bushing does a great job isolating the vibration. I noticed a lot of reviews complaining about the nuts coming loose. Just use Loctite or replace the nuts with nylon lock nuts. Bottom line: they work and they're worth a try for the price.

The vibration-damping inserts didn’t work as expected at all. They feel cheap and don’t hold up under normal use, making the garage door noisy and unstable. The quality is poor, and they don’t fit properly, causing more hassle than they solve. Definitely not worth the money, and I wouldn’t recommend them to anyone looking to improve their garage door performance. Save yourself the frustration and look for a more reliable alternative.

What up the replace the ones in my generator that seem to have fallen out and can't find. They work perfect!