1/4" to 5/16" stud? - help

[XtremeJ]

greetings oh knowledgable tool forum posters

I have a Radical sports racer in the shop that we are installing a pneumatic gear shift on. I have run into a problem on the gear shift linkage.

A shift rod runs from a bellcrank on the gearbox, to the shift handle. This is a sequential shift tranny, motor is a R1. The paddle shift pneumatic actuators are going to attach to the other side of the shift handle.

My problem lies in the rod ends, one is a male heim 5/16 x 5/16 and the acutator side is 1/4 x 1/4 but female heim. They don't make 1/4 x 5/16 (bore) female heims that I can find. Remember this is a race car so only aero or race quality heims need apply.

The gear lever is bushed and tapp'ed to 5/16th.

Does anyone make a stud with 5/16th on one end, and 1/4" on the either. both fine thread. needs to be about 3 inches long at most. I could then thread the stud through the gear lever, and attach each heim on either side.

I have tried McMaster, but perhaps I am using the incorrect terms. stud, threaded rod, adapter screws, bolts.

help? please

thanks

Grant

[Travis Waldher]

I would get a 1/4" stud and a 5/16" stud and weld them together myself.

Hell, for that matter, if both are RH thread, just cut the head off of two bolts and weld those together.

[XtremeJ]

Travis, that is my ultimate last resort. not that I dont trust my welding, but that is one delicate small stud, and this is a pretty wicked fast car.

I may resort to having one machined.

am I even referring to the fastener by the correct term?

[Travis Waldher]

A 1/4 and 5/16" stud isn't the small.

I'de just line them up with a small gap between them, weld all the way around, grind clean, and paint.

I wouldn't be worried about strength at that point.

Don't like that, get some round stock, turn down ends to size necessary to tap them.

[Magoo]

Do it right and have a machine shop turn the end down to 1/4-20. Minor diameter of a 5/16-18 is ~.257 and the major diam of the 1/4-20 is ~ .245" so any compitent machinist should be able to do it. If I were closer I'd hook you up... if is for children though.

[BumpyDodge]

I'm sure you could work around it, but without some pictures or plans I can't really help you. Maybe just a plain bushing would work?
Here's a source for aircraft hardware->
http://www.aircraftspruce.com/catalog/

If all you want is a custom stud made that has two different diameter ends, I'm sure any decent machinist could make one for a reasonable price. It's not a complicated job.

[blay127]

Try searching for "Universal Stud". You might find what you're looking for

edit: I found what you're looking for in a catalog, SPEC stock fasteners. But I cant find it online to give you a link. Its called a Universal Stud in that catalog, but I cant find anything else like it anywhere.