On 2008-06-05, William Bagwell wrote:
On Thu, 5 Jun 2008 12:59:45 -0700 (PDT), Tim Shoppa wrote:

When I look at small eye bolt threads (not wood screw, machine screw)
I see thread sizes like 1/8"-32 and 3/32"-32 and 3/16"-24 in the
catalogs.

(e.g. McMaster-Carr page 1465.)

Is it possible that these are really 6-32, 8-32, and 10-24 threads,
just called something weird out of the deep eyebolt tradition? Or are
there truly funky threads with matching funky nuts only used on
eyebolts?

Well... using the formula for diameter for number screws, I find
that:

================================================== ====================
Katana:dnichols 22:57:27 number-screw 5 32
For a #5-32.000 screw:
Clearance diameter: 0.125
Tap drill diameter: 0.094
================================================== ====================

So -- it is a number screw, but an uncommon one.

As for 3/32-32: (0.093" diameter)

================================================== ====================
Katana:dnichols 22:57:32 number-screw 3 32
For a #3-32.000 screw:
Clearance diameter: 0.099
Tap drill diameter: 0.068
Katana:dnichols 22:59:19 number-screw 2 32
For a #2-32.000 screw:
Clearance diameter: 0.086
Tap drill diameter: 0.055
================================================== ====================

Neither of these match the diameter of the fractional size.

Same lack of match for a 3/16-24: (0.1875")

================================================== ====================
Katana:dnichols 23:01:41 number-screw 10 24
For a #10-24.000 screw:
Clearance diameter: 0.190
Tap drill diameter: 0.148
Katana:dnichols 23:01:47 number-screw 9 24
For a #9-24.000 screw:
Clearance diameter: 0.177
Tap drill diameter: 0.135
================================================== ====================

I remember stove bolts coming in similar small fractional funky sizes
too but don't see them much anymore.

A 10-24 nut fits the 3/16-24s from Home Depot just fine. Can't say for
sure about the other two sizes.

It calculates to be just a bit loose.

We use them to hold mold-in inserts at my work, so I keep a small supply
as well as a box of extra nuts. Each "insert holder" needs two nuts and
I can tell no difference between the nut that comes with the eyebolt or
the ones from the box.

O.K.

Enjoy,
DoN.

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