Instructables

Where to find 10-32 2-1/2 special bolts?

I need a very wide head 10-32 bolt for a project I am working on, because a small head does not hold enough friction against my other part for my needs. The best solution I think would to get a 10-32 carriage bolt (2.5 inches long), but I cannot seem to find this anywhere. Is there a store anywhere that sells low quantity (I need about 5, but could settle for 10-50 if I needed), but I cannot seem to find a store that sells this apparently odd screw size...


Kiteman1 year ago
Could you not glue a washer onto an ordinary bolt?
astroboy907 (author)  Kiteman1 year ago
And the DIY solution prevails...

What would you recommend as an adhesive? I assume JB Weld (what I have on hand), but whatever works I can probably get. I have some Epoxy 6000 if I remember right, superglue, etc.

I believe what I can get locally in that length is Zinc coated Steel. Possibly stainless if I look into the depths of the hardware store.

One day, I just need to go to the hardware store and spend 4 hours going through every drawer to see what they have :) not like they already hate me enough spending hours at a time there and getting two dozen mixed screws, nuts, washers, and bearings and then leaving!
JB is probably fine.

A decent hardware store, one withdrawers, that will sell individual bolts and has staff that understand their stock and their customers, that's a rare thing you have there. Don't think you are upsetting them, get to know them. Explain what you are doing, take in sketches of your ideas (or your projects, if they are portable).

Accept their advice, thank them volubly for their help, and your projects will prosper.

I don't know how old you are, but you could also ingratiate yourself into a weekend or vacation job.
astroboy907 (author)  Kiteman1 year ago
Well, its an ACE hardware store, so its a bit more commercialized (the room for pet supplies beats out the space taken for screws, etc). I believe there is a more local hardware store, as well as a fastenal, but Ace seems to have the more specialized items (knurled knobs, rubber washers, etc) which I generally need (I live in an agricultural area so finding 2 inch wide nuts and bolts is easy, but finding 4-40 screws is a challenge) .

Still, I have had on occasion asking the staff if they know where to find YX bolt, and they reply "We don't have that", and yet while looking for the next best thing, it turns out they have it. However, I will try to get more talkative with the staff and try explaining my projects. And maybe get a job. I'm in high school, so getting a job shouldn't be so much of a problem.

What we really need here though is a store with just lots of screws and bolts and tools, and a lot of specialized stuff. Like a screw emporium :)


Anyways, thanks for the reply!
kelseymh1 year ago
I don't think you're going to find a 2.5" long 10-32 bolt or cap screw; the best I could find was 1.5" length. That's too much length for too narrow and fine a thread. If you really need that length, you may need to get threaded rod, or tap the thread yourself.
astroboy907 (author)  kelseymh1 year ago
Turns out the local hardware store has some near the size (course thread but the same size...)

Unfortunately I realize now that I am going to have to increase the size of my bolts to keep them from bending (and get more selection).

So right now they are #10-32 (about .190" ), what do you think I'll need to go up to. The max load will probably by 8lbs but it will be literally just handing off the end of the screw. 1/4-20 screws are cheap and available, but do you think they will have much more strength?
This requires a proper engineering calculations. 8 lbs hanging of the head of the bolt shouldn't be much of a load at all, provided the bolt is fully secured. If you're using the bolt as a cantilever, then you need to compute the torque (here it sounds like 16 in-lbs, assuming you use half an inch of thread to anchor it). You need to know the bending strength of the bolt. The link I provided above should help.
astroboy907 (author)  kelseymh1 year ago
I'm pretty much copying this design (Pan and tilt head), but changing a few dimensions (and converting to imperial measures). 

But where the 8lbs is is the L bracket where the camera sits (and 8lbs is a LOT of weight, but just as an absolute maximum..). I am going to add another mount where the motor sits and add a "pillow block" type of thing with a bearing to reinforce the shaft, and keep the gear from "rolling up" the worm if the L bracket is pulled away from the assembly, as well as keep the bolt anchored...

So I'd have to find out the bending strength of these bolts.. :) I'll google some!
oldmicah1 year ago
As Kiteman suggested, gluing a washer is the fastest/cheapest route. If that fails, you might try calling these guys: http://www.crownbolt.com/Products/products.asp. Not sure they will have it, but I haven't been able to stump them yet. :)

Best o' luck!
astroboy907 (author)  oldmicah1 year ago
Sweet, thanks for the info!!
bajablue1 year ago
First off: I don't know anything about bolts.

But if I were you, I'd contact a few bolt manufacturers and ask them if they could provide a list of their Retail customers who order that particular bolt and follow through from there.

Good Luck!