s
Quite good
I have used these in many racks with both M5 and M6 screws. These ARE compatible with both M5 and M6 screws because adaptors are provided for M5 screws.
As noted by another reviewer the can get mis-shapen if you are not careful, but this has only been a cosmetic problem for me.
As for isolation, they have worked every time for me (tested). I have not had trouble keeping the faceplates isolated. Important: when testing for isolation/continuity, remember to unplug all of the power cables from power distribution unit to rack devices. Otherwise the meter will indicate continuity, since the devices are joined through the PE/ECC conductor of each piece of gear (and this is how it must be for safety - NEVER cut a ground/PE/ECC conductor.
As noted by another reviewer the can get mis-shapen if you are not careful, but this has only been a cosmetic problem for me.
As for isolation, they have worked every time for me (tested). I have not had trouble keeping the faceplates isolated. Important: when testing for isolation/continuity, remember to unplug all of the power cables from power distribution unit to rack devices. Otherwise the meter will indicate continuity, since the devices are joined through the PE/ECC conductor of each piece of gear (and this is how it must be for safety - NEVER cut a ground/PE/ECC conductor.
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M
Product is fine but a few quality issues
I bought about a dozen of these to try and help deal with hum issues from my rack gear. For the most part they are effective, but at times the installation is troublesome and the the plastic that wraps around the rack ears is prone to breaking. In addition, the heat shrink around the screws can either come loose or isn't secured properly to the screw, so a heat gun is required in the event anyone has similar issues.
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SW
Great for avoiding rack rash
Although Humfrees are designed to reduce potential groundloops, I actually use them primarily as washers to avoid getting rack rash on my gear. They've helped me keep some of my rack gear looking new for over 10 years now, but they can be very fiddly to use. Furthermore, if you move your gear in and out of the rack often, they will tend to wear out eventually, so I've had to replace them from time-to-time. However, given that they're relatively expensive, I think they're more than worth the price.
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