Im working on replacing the black oxide bolts on my Crupi Pro round pedals with 18-8 stainless. I went to BoltDepot.com and ordered both American and Metric thread gauges to help me see what I needed. These gauges were for the most part very helpfull. This is what I found:

Crupi Pro Round Pedal Bolts

Spindle Bolt (1/pedal)
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Type: English
TPI: 28
Diameter: 1/4
Length: 3/8


Cage Bolts (4/pedal)
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Type: English
TPI: 24
Diameter: No. 10?
Length: 3/8

The only thing I'm not sure about is the diameter of the cage bolts. My gauge doesnt go smaller than 1/4 inch. BoltDepot and McMaster-Carr show the size just smaller than 1/4 as a number 10.

My question is this: Are there any of my fellow board members that have expertise in the sizing of bolts? What exactly is a number 10? Is there another gauge I can buy online that will give me this info? Is there a chart I can look at online that translates these numbers into actual dimensions?

I have to buy these bolts in quantities of 50. The upshot of this is that after I get it figured out, Ill be able to sell those with like pedals, bolt kits to do the same thing. All bolts necessary for your Crupi Pro round pedals in 18-8 stainless shipped to you in the US for $3.00 plus whatever shipping is (3-5 bucks? I havent checked it out yet). Also after I figure this out, Ill pick a person each who have the square or minis and give you a set for nothing (just shipping) so I can see if the sizes are the same.

Also: Ive started a database on my bike. Every part, nut, bolt, washer, modification, bearing, color change, etc. All of it. Every aspert. Who made it. When did I get it. Where did I get it. How much did it cost. What are its attributes. I plan to then make a PHP front end to put my bike online with pictures of everything, notes, descriptions, etc.

My mom, who works at a dentists office gave me an idea. All the dental tools are color coded to indicate size. How about titanium hardware which anodizes nicely, that was color coded to indicate which allen key it used? So when you needed to make an adjustment to a "gold" allen bolt, you grabbed the "gold" allen key. Just a thought.

I got a box of those bolts at home. I can post later tonight what size you need.

Eric,

Do you play guitar?

Sorry--had to ask.

Hey Eric,
Your cage bolts are known as a 10-24.
The 10 equates to 0.190 inch. 10 is for drill size, #10. 24 is of course threads per inch(TPI), 24 is course, 32 is fine. Tensile strength is about 180,000 PSI or higher?

Eric,
How dare you try to apply logic to everyday life...replacing rusty mild steel bolts with stainless so they won't corrode...color keying fasteners to corresponding tools. Sometimes inefficiency makes jobs YES? or at least it's the American Way of late (of keeping jobs from being exported to India)
...But don't assume that stainless is better because often it lacks the same strength as it's rusting mild steel counterpart. That's why you won't see many offroad racers using it to hold down rollbars or other stressed parts. I agree that it looks cool and can even be polished to a "permanent chrome" state but it must be used sparingly (on Harlerys). Also, and this IS A BIG ALSO, while stainless appears to be a "mild-mannered" type of alloy that does'nt corrode when exposed to the elements...it causes electrolosis (galvanic corrosion?) when screwed into something made of aluminum. You HAVE TO use anti-seize or Blue Loctite to act as a barrier between these two dissimilar metals or there will be problems later on possibly.
I've personally argued with the dudes from Yakima about spending thirty cents more per roof rack to supply their products with all stainless hardware so us posers in SoCal can drive our Beamers around all years long with the racks on without fear of rusty water dripping on the roof. You can lead a horse...

Don't mean to put the kabosh on your ideas...hey, Sears started putting LARGER size markings on their sockets so that those of us without Xray vision could grab the right socket when under a car in the dark with greasy hands.
Keep thinking though...just try to look at the opposite side to everything you come up with. I say this because I applied for my first patent this week and it's been a short/hard course in Devils advocacy. Cheers