I have a piece of 3/16" rod aluminum,what is the closest size threading
die I can use. Is 10-32 allright?

On Sep 16, 8:32 am, LeonNick wrote:
I have a piece of 3/16" rod aluminum,what is the closest size threading
die I can use. Is 10-32 allright?

10-32UNF is fine on 3/16" dia. rod.

The theoretical O.D. is .190". Actual male thread O.D. is always a
few thou smaller than the nominal diameter.

Wolfgang

On Tue, 16 Sep 2008 08:32:24 -0400, LeonNick
wrote:

I have a piece of 3/16" rod aluminum,what is the closest size threading
die I can use. Is 10-32 allright?

10-24 might work better in aluminum. Use cutting fluid -- kerosine
or WD-40 works.

On 2008-09-16, LeonNick wrote:
I have a piece of 3/16" rod aluminum,what is the closest size threading
die I can use. Is 10-32 allright?

That looks very close, but slightly too small.

3/16" is 0.1875

and asking for dimensions for a 10-32 screw I get:

================================================== ====================
izalco:dnichols 20:17:36 number-screw 10 32
For a #10-32.000 screw:
Clearance diameter: 0.190 ============
Tap drill diameter: 0.159
================================================== ====================

So -- you would be missing 0.0025" diameter -- not too bad.

Otherwise -- the next nearest would probably be a metric size.
Converting 3/16" to metric gives 4.7625mm, so the question is whether
there is a 4.75mm thread -- or a 4.5mm one might be a bit more likely.
I know that there is a 3.5mm, but I'm not sure of anything between 4mm
and 6mm.

Good Luck
DoN.

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On 17 Sep 2008 00:31:38 GMT, "DoN. Nichols"
wrote:

On 2008-09-16, LeonNick wrote:
I have a piece of 3/16" rod aluminum,what is the closest size threading
die I can use. Is 10-32 allright?

That looks very close, but slightly too small.

3/16" is 0.1875

and asking for dimensions for a 10-32 screw I get:

================================================== ====================
izalco:dnichols 20:17:36 number-screw 10 32
For a #10-32.000 screw:
Clearance diameter: 0.190 ============
Tap drill diameter: 0.159
================================================== ====================

So -- you would be missing 0.0025" diameter -- not too bad.

Not missing anything. A .1900 major diameter is out of spec for a
standard #10 2A thread and at the high limit for a precision 3A
thread.

Thread: Major diameter:
10-32 UNF-2A .1891/.1831
10-32 UNF-3A .1900/.1840
10-24 UNC-2A .1890/.1818
10-24 UNC-3A .1900/.1828

--
Ned Simmons