Where to buy machine screw assortment?

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Subject Author Date
Where to buy machine screw assortment? John Doe 02-25-2008
Posted by John Doe on February 25, 2008, 4:20 pm
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I'm doing an important project. Trying to thread a machine screw
into some aluminum. Halfway through, the machine screw twists apart
just below the head. The heads breaking off is not uncommon here. I
don't put all that much pressure on them, so either I'm Superman or
the machine screws I buy from Lowe's are made out of junk steel.

I guess the upside is that at least the screwheads don't strip first
:o/

Is stainless steel necessary, or is there an assortment of zinc
plated (or whatever similar type) machine screws/nuts made out of
decent steel someplace on the Internet or at a USA chainstore? I
need sizes like 6, 8, & 10.

Thanks.

Posted by Christopher Tidy on February 25, 2008, 4:38 pm
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 John Doe wrote:
> I'm doing an important project. Trying to thread a machine screw
> into some aluminum. Halfway through, the machine screw twists apart
> just below the head. The heads breaking off is not uncommon here. I
> don't put all that much pressure on them, so either I'm Superman or
> the machine screws I buy from Lowe's are made out of junk steel.
>
> I guess the upside is that at least the screwheads don't strip first
> :o/
>
> Is stainless steel necessary, or is there an assortment of zinc
> plated (or whatever similar type) machine screws/nuts made out of
> decent steel someplace on the Internet or at a USA chainstore? I
> need sizes like 6, 8, & 10.

I assume that you're tapping the holes first, right? If not, that's your
problem.

Screws should thread into tapped holes very easily. If your tap is
extremely worn, that might be the problem. Or you could be using the
wrong size of tap. Or you might not be cleaning out the swarf from the
hole after tapping.

But I doubt you could break even the cheapest screws by simply threading
them into correctly tapped and cleaned holes.

Best wishes,

Chris


Posted by John Doe on February 25, 2008, 5:13 pm
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> John Doe wrote:

>> I'm doing an important project. Trying to thread a machine screw
>> into some aluminum. Halfway through, the machine screw twists
>> apart just below the head. The heads breaking off is not uncommon
>> here. I don't put all that much pressure on them, so [apparently]
>> the machine screws I buy from Lowe's are made out of junk steel.

>> Is stainless steel necessary, or is there an assortment of zinc
>> plated (or whatever similar type) machine screws/nuts made out of
>> decent steel someplace on the Internet or at a USA chainstore? I
>> need sizes like 6, 8, & 10.
>
> I assume that you're tapping the holes first, right? If not,
> that's your problem.
>
> Screws should thread into tapped holes very easily. If your tap is
> extremely worn, that might be the problem. Or you could be using
> the wrong size of tap. Or you might not be cleaning out the swarf
> from the hole after tapping.
>
> But I doubt you could break even the cheapest screws by simply
> threading them into correctly tapped and cleaned holes.

I need more strength than just enough to thread the machine screw
through a correctly tapped and cleaned hole. If the screw is going
to break so easily, it probably won't hold the pieces together
either. That's my problem.











>
> Best wishes,
>
> Chris
>
>


Posted by Christopher Tidy on February 25, 2008, 5:33 pm
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John Doe wrote:

<snip>

> I need more strength than just enough to thread the machine screw
> through a correctly tapped and cleaned hole. If the screw is going
> to break so easily, it probably won't hold the pieces together
> either. That's my problem.

You shouldn't be breaking even the poorest screws just threading them
into a tapped hole without tightening them. Something is seriously wrong
here. Either that or you're trolling :-).

Try McMaster-Carr. They may have sets of screws.

Best wishes,

Chris


Posted by John Doe on February 25, 2008, 6:18 pm
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> John Doe wrote:
>
> <snip>
>
>> I need more strength than just enough to thread the machine screw
>> through a correctly tapped and cleaned hole. If the screw is
>> going to break so easily, it probably won't hold the pieces
>> together either. That's my problem.
>
> You shouldn't be breaking even the poorest screws just threading
> them into a tapped hole without tightening them. Something is
> seriously wrong here. Either that or you're trolling :-).

Like by ignoring the question and for some strange reason insisting
that threading a machine screw into a properly tapped hole is the
only valid application for a machine screw. Plastic screws into
properly tapped holes. Threading screws into a hole is not the end
objective. The objective is to keep the pieces together. I can tell
that the bolts aren't strong enough, that's why I ask for better.

> Try McMaster-Carr. They may have sets of screws.

If they are better than the apparent crap I get at Lowe's.















> Best wishes,
>
> Chris
>
>
>
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