Metric Coupling Nuts M10 1.25

Ok, so I bought a nice used sissy bar with pad off from eBay. The thing will fit fine without taking my Yamaha grab bar off of my 82 Yamaha XJ650 Maxim. I had to by some chrome spacers for the back brackets and where the front bracket needs to hook up I need and for the life of me cannot find a chrome, stainless steel or any metal coupling nut to hook onto the male machine screw where the acorn nut on the grab bar is located. I need a M10 1.25 coupling nut about 1=2 inches long to install this thing. I've been to Ace Hardware, Menards, Home Depot, Lowes, Millard Lumber with no luck at all. Online the closest I can come is a M10 1.50 coupling nut which definitely wont screw on at all. Is there any place that sells this size at all? My only other option would be to take out the machine screw or bolt that I think is welded on the frame (not sure) and change it to like 3/8" with sae thread. Man, when they made these bikes they used hard to find nuts and bolts. Still haven't found the engine M10 1.25 acorn nut any place on this earth....lol. I really dont want to remove the stock grab bar just for cosmetic reasons and I think pretty much for sure the sissy bar can be installed over it, it fits at least. Any suggestions are welcomed......Thanks for any answers........HB
Here are picks of the location where I need a metric coupling nut:
http://i148.photobucket.com/albums/s40/ ... sybar2.jpg
Here is the sissy bar just sitting on top of my seat uninstalled:
http://i148.photobucket.com/albums/s40/ ... sybar1.jpg

 

hb, I ran into the same problems as you did. The bolt at the front, I just use a regular galvanized bolt. But for the spacer in the back, I used a 7/16 chrome socket, had to grind a little bit of it down to fit properly, but it looks good.
If you find an engine acorn nut, let me know.
I will just polish mine and quit looking.
I just bought 32pc Stainless Carb Bolts Yamaha XJ750 XJ650 for $5.95 off e-bay.

If anybody needs them here is the seller

http://cgi.ebay.com/ws/eBayISAPI.dll?Vi ... 0487722150

has for other models too.

 

hb.
My sissy bar doesn't bolt on at the shock, but the other bolt in front of it.

If you could find a chrome tubing, then cut your sissy bar and let it slide into it and then you could bolt it down at the front bolt.

 

Galamb, That is a good idea...I even thought about just drilling and tapping a new hole (not metric of course) in the grab bar either forward of the shock bolt or back farther, but then the rear mounting hole doesnt line up. You have any pictures of how you did yours? Thanks for the link about the carb bolts also...

 

You could just get a local machine shop to whip you up a couple out of whatever bar stock they have laying about; find the right place and they probably wouldn't charge you more than a few bucks...

I looked and looked and looked and FINALLY found a source for black metric hardware and odd things like acorn nuts, etc. The ONLY place I found that doesn't want to sell you boxes of 100, etc.

The only problem is, their customer service sucked so bad I won't deal with them anymore and can't recommend them to anyone.

Still looking...

 

Hey bigfitz, I dont know of any machine shops around here at all. I used to work at a power plant and we had 4 machinists that made this type of stuff all the time on a lathe....but that don't do me any good now of course. I do have a big ole drill press that I think I've used maybe 2 times in the garage. I should start a business making these hard to find items. I also have a tap and die set that I have never used (got it for a Christmas present way back). I think I might just try my hand at making me some metric couplings myself. I did find a site that sells Metal Bar Stock....aluminum, stainless steel, alloy steel in all shapes and sizes, dont know if they have a minimum order rule or not. I have never tryed tapping or drilling and threading any type of metal before. I would imagine that aluminum would be the easiest to tap out and cut thread into. Stainless I know is very tough to even cut through period. Here is the site if any of you are interested and know how to tap and die metal for specialty parts for your bike. I'm sure people have already found this site but here it is just in case. https://www.speedymetals.com/default.aspx
LOL, I just now noticed right on the front page in big bold letters "No Minimum Orders". I'm gonna order 2- 1 1/4" Hexagonal 2011-T3 Aluminum bars cut at 2" and 2- 1 1/2" Hex 6061 the same size and the price is $6.88 for the 2011 and $3.68 for the 6061 alminum plus $12.50 for the cheapest shipping price, UPS ground (ouch). Dont know what the difference is between 2011-T3 aluminum and 6061 aluminum. The 2011 is twice as much so I am assuming it is twice as strong. Well the shipping is kinda high but hey if they cut it to size and all that......what's a guy gonna do?

 

http://www.onlinemetals.com/
i kind of don't think aluminum is going to cut it here, you want 12L14
or 1144 steel, 12L14 is the best machining steel 1144 is a little stronger
if i had that tap i'd be making a few

 

You can get all kinds of spacers at McMaster carr.
http://www.mcmaster.com/#spacers-and-standoffs/=5pu70c

I couldn't find any 12mm threaded ones, so you will still need to tap it yourself but if you pick the right size you shouldn't need to do anything besides tap it out.
I would be willing to bet the tap set you have doesn't have a 12mm-1.25 though.
I think the more "standard" pitch is 1.50 or 1.75

You'll have to look at a tap chart to determine the size hole you need and hopefully they have an imperial size close to what you need.
There is no minimum, but shipping will probably be $8
Some hardware stores and "home improvement" stores have a small assortment of these things in the hardware section but most are on the smaller size of what you need.

 

If you look at the first picture I posted where the front bracket needs to hook up. It's where there is an acorn nut size M10 1.25 thread. I want to make a coupling nut that will screw onto that M10 1.25 bolt under that acorn. I need to make the coupling about 1-2" long so the sissy bar doesnt bang up against the Yamaha grab bar. Screw it down tight to hold the shock and grab bar in place, then place the bracket on the outside of that coupling and I can get a couple of M10 1.25 galvanized bolts in just about any length at Ace hardware(They have a bunch in all lengths) to secure the front of the sissy bar to that location. Polock, are you sure that just with the front bracket of the sissy bar bolted into a piece of tapped out aluminum coupling wouldn't be strong enough. Plus I dont think aluminum will rust like steel. The back bracket is being bolted with a M10 1.25 steel bolt right into the back of the frame. Let me know.....Oh and Mike, youre probably right I'm gonna have to go find that set and check it out for the 1.25. tap. They do have the M10 1.25 bolts in zinc or galvanized at Ace. I have noticed in every place that I have been that they usually have the 1.25 thread only in sizes up to M8 for acorns or nuts and then when the size goes to M10 it's only 1.50 or 1.75. I have found that to be true on almost every site that sells nuts, bolts or couplings. The M10 1.25 is like trying to find actually really free software, it aint happenin!

 

take a look here 10mm would be between 3/8 and 7/16 the standard would be 13 or 20 ft/lbs on a 2024 t4 bolt
the book calls for 21.7 ft/lbs, remember that is the top shock mount too
you might be ok but keep a eye on it
should really ask Schooter, he's almost a engineer

 

I think I'm gonna just go with steel to be on the safe side seeing how it holds the back shocks on. I did find a M10 1.25 tap at a place here in Omaha, Nebraska named "Tighton Tools and Fasteners". Wow, they have just about everything. The guy said he could order me one and it cost about $5.00 and will take 4-5 days to get in and he'll call me. Here is their website if interested http://www.tighton.com/contact-us/ . Trust me I went everywhere else and they all just looked at me and said "M10 1.25, don't even think they make that size" Then they would check and say "No, can't help ya!" This place told me right away they could get me one! Thanks all for the feedback and help. Thanks Polock for the advise and info!

 

Now ask THAT guy if he knows of a local machine shop... I guarandamntee ya there's more than one in Omaha...

If you want some black socket-head M10X1.25 bolts, let me know what size.

I seem to have quite an assortment...

 

I have EXACTLY what you need I think!

About two years ago I made a couple threaded spacers to extend my front signal lights but never used them because it was easier to trim the shield.

I just stumbled across them in my tool box.
They are 1" diameter polished SS 1 1/8" long with 12mm-1.25 threads!

I have two....how much are they worth to you??

OH...nevermind, you needed 10mm

 

Or maybe you could get a forum member to make you a set...

 

Oh you had me there Mike, I was thinkin "Cool he's got some already made and their SS too!!!!" Oh well. bigfitz, I'm gonna try to be a machinist on this one project and if and "When" I fail, then I'm quite certain I will find a machine shop to make them. Heck they built a real nice big building up the street and everybody said it was going to be a machine shop.....it never did get opened up and one of those "Servpro" fire and water damage places bought the place. Thanks all!!

 

i just ordered the tap, i always thought that would be a good place for a bungee hook rather than marking the side rail all up, might be a good place to hang a helmet too

 

Hate to change the subject but you have some nice bikes there Polock. The black Yamaha, what year and size is that? Did it come with the two headlights and those shocks look like Harley shocks.........very nice lookin ride there. Also Did you order that tap from that site I posted? Good idea also for a hook placed there..........hmmmm!!!!!!!!

 

thanks, thats a 82 750 maxim, i think the two lights were stock that year the top is the headlight the lower is a 35 watt driving light on a separate switch
some had a yellow lens, that one's in a parts box now
those are original old shocks
got the tap at enco.com, they have everything from quality usa stuff to
pure junk from india

 

something like this 1.2 inches by 3/4 inch slotted for 13mm wrench
tapped 10X1.25 all the way

 

What are those couplings made out of Brass or steel Polock? They look perfect!

 

that would be the 12l14 steel, they will rust unless painted