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I lost an m7 set screw. What do I do?

M7 set screws are impossible to find in hardware stores. So instead of paying out the wazoo for a single screw online, is like to find another way to safely hook up the power cable on my amp. (I found an m7 bolt in lowesb afraid it'll arc and cause a fire if I use that)

Is there a way to solder this 4 gauge wire to the amp?

Its for a class D monoblock subwoofer amplifier in my car.
thirdeyethirdear
n80
2,107 posts
 
Check out McMaster-Carr.

https://www.mcmaster.com/set-screws
sleepwalker65's avatar
sleepwalker65
832 posts
 
You’re in way over your head. Get a professional installer so you don’t end up with an electrical fire 🔥. 
teo_audio
2,197 posts
 
If the space around the bolt is fine, then the bolt should be good until you find a proper M7 set screw.

The advice is to make the bolt the ground lug one, meaning if the missing set screw is on the power or speakers, move the set screw of same size from the ground over to the other terminal, and then use the M7 bolt for the ground wire tightening.

That way, if the ground 'bolt' is accidentally grounded to the chassis of the car or the amp, or whatnot, it does not matter...no current will flow as it is already at ground potential.

Again, if they are all m7 connections, make the ground connection the one with the bolt. You'll be fine that way until you get to finding a proper M7 set screw.
bdp24's avatar
bdp24
9,510 posts
 
My local Ace Hardware has metric set screws.
thirdeyethirdear OP
9 posts
 
Thanks for the advice! I ordered a good kit for this amp. The only thing missing was that one set screw. When I wire it this week, ill use the bold (unless I can find a new m7 set screw) to the ground terminal.

Its a jbl BP1200.1 mono amp (for car audio). I feel confident in my skills here, just wanted to get some extra input.
Thanks
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