I Have a nice , now worthless Bosch compound miter saw because the Bolt holding the blade in broke while removing it

It is a Bosch 3912 12" saw and part #150 or 2610911467 is obsolete or unavailable, That I can find.

Hardware stores, Napa and small powersports store told me they had nothing.

I believe it's 7/8" long and approx 1/4" Dia.

Ant ideas for finding an exact replacement part or a Doable fix?

Fastenal probably would have it, or have a machine shop turn one.

1/4" heli-coil.

Buy a kit, drill only big enough to remove old threads and tap to 1/4"rh heli-coil.

Rotation of the blade would back it out I would think. Unless you Dutch screw it or something

True.

I got the impression he wanted away or ok with getting away from the lefty, but if not, like you said he can buy a left bolt. McMaster Carr or fastenall are a couple places to look. Our hardware store has a slim selection.

https://www.ebay.com/sch/i.html?_from=R40&_trksid=p2380057.m570.l1313&_nkw=1%2F4+left+hand+thread+bolt&_sacat=0

https://www.amazon.com/s?k=left+hand+thread+bolt+1%2F4+20&crid=7Y1YV3PG5J6&sprefix=1%2F4+left+hand+thread+bolt%2Caps%2C214&ref=nb_sb_ss_ts-doa-p_1_25

Use an allan head cap screw for a better grade

Probably a metric size. Should not be that difficult to find but first you have to determine the diameter and thread pitch. I suspect someone like Grainger or MSC Industrial supples would have what you need. Since it is listed as obsolete, Bosch might give you the size specs. I would call their customer service number and ask.

If its Bosch its metric. thats for sure. Is there enough of the thread to measure what it is ??

M8 x 30mm Left hand flange bolt but not sure of thread pitch. Most M8 bolts I found listed were 1.25 pitch.

You Guys are too smart for me.

I'm a Trapper, not a machinist


I live in a Small Town , I could mail it to one of you intelligent Trapper- Machinist

Or look for a fastenall and drive.

What would you do in my place?

A regular right hand drill bit will back out a left hand thread. Once the broken off stud is out, you should be able to use a thread pitch gauge or take it to the nearest auto parts store and have them thread nuts onto the stud until they find the right one. Once you know what the diameter and thread are, McMaster Carr will have the bolt you need.

I would just order one here

https://www.mcmaster.com/screws/system-of-measurement~metric/thread-pitch~1-25-mm/thread-direction~left-hand/


Left wing nuts are easier to find here though

If you still don't have any luck, try local small engine shop. Weedeater cutting head bolts are LH, and about that size. Even if you had to get a stud or stem, and weld a nut on it.

Check with your local Lowes. Looks like Dewalt uses an M8 left hand thread also. Take the broken one with you to match size and approximate length.

Scott, If you can't find one, send it to me. I have the tools to measure size and thread pitch, both metric and SAE.


I AM the 'Make it happen guy'.


PM me for my address.

Charlie

Just found a question/answer on ereplacements website that said that Dewalt Part Number:145344-01 is an M8 x 20mm 1.25 pitch left hand thread flange bolt. Should work just fine.

Here is a link:

ereplacementParts

Thanks for all the help.

X2 in McMaster's

check on e-bay