This is a list of what I have learned is the most useful for Radio Work.
In fact I am going down to my local Hardware store to see if they have this stuff. If they don't There is a company here called Tacoma Screw (there prices are higher but its better quality), and of course you can go to Lowes or Home Depot or, one of my favorites is ACE Hardware. Then there is Allied Electronics mail order.
Hardware for Electronics
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Screws
4-32 x 1/4 steel machine screw
4-40 x 1/4 steel machine screw
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#6 x 1/4 Cadmium plated self-tapping screw
#6 x 1/4 Bronze finish self-tapping screw
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6-32 x 3/8 steel machine screw
6-32 x 3/4 Brass Philips head machine screw
6-32 x 1/4 steel Machine Screw
6-32 x 1-3/4 steel machine screw
6-32 x 1/2 round head steel machine screw
6-32 x 3/4 round head steel machine screw
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8- 32 x 1 1/4 steel machine screw
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Nuts
4-40 hex nut
6/32 x 1/4 Hex Nut
8/32 Hex Nut
3/8 - 32 Hex Nut
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Spacers
1/4 x 1/4 Brass spacer for #6 screw
1/4 x 1/8 spacer for #8 screw
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Washers
#4 steel washer
#6 steel washer
#8 steel washer
#4 internal tooth lock washer
#6 steel washer
#6 internal tooth lock washer
#8 steel washer
#8 internal tooth lock washer
3/8 internal tooth lock washer
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Misc
3/8 rubber grommets
Solder Lugs #4 and #6
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Here is a good hardware chart from Bolt Depot
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I'm a Science Thinker, Radio Tinkerer, and all around good guy. Just ask Me!