What is the correct name?

[adrian44]

Can you please tell me what is the accurate name of a shaft that has this cross section? It is basically a regular circular shaft but then two cut aways where made to its sides

 

[Doug B]

In regards to steering components,it's called a double d

 

[ddawg16]

I'm not sure if that is a double D....but I know THIS is a double D...

 

[MoToys]

Yes a double d, the same as most tool box cam lock cut outs.
Obviously not as nice as the d's above.

 

[adrian44]

Thanks people

 

[Zeke]

I've heard people refer to that shape as having "flats." Especially when most of the bar is round and the shape is machined or ground only a small section. I'm sure machinists have a technical name.

 

[er3456df]

Rather than start a new thread-

I'm looking for pulleys and couplers to fit on these shafts, but google only brings up info about steering columns and bras.

What would I need to search for (on Grainger.com, for ex) to find these? All I can find are for round shafts.

 

[rwhite692]

That type of shaft material is not commonly used for rotational (speed) applications w/pulleys, etc

It is very, very expensive vs. typical round shaft

Mainly used for steering shaft as you have already noted/been told

Why not use round shaft? What is your application?

 

[Steevo]

I am pretty certain that ddawg16's girlfriend above is way above DD

 

[Torque1st]

Farm equipment uses that Double-D shaft, U-joints, and couplers. Try Tractor Supply.

 

[Mr.Magoo]

The Deputy Dawg must have taken those pictures prior to taking her into custody for some kind of exhibition charge! As to the Double "D's" I would just call them what my eyes said when I scrolled down, Duh! x 2 Kinda of like Double D's

 

[chris29ford]

In the machine shop we call them spade ends.

 

[little d]

er, is there any reason ya couldent use a round hole with a set screw on the flats?

 

[Kevin54]

A round holed pulley will work fine on that shaft. You have to know what the diameter is across the radiused portion. The flat area will accept the setscrew of the pulley. If you can do it, when you find a correct pulley, add a setscrew 180 degrees from the existing setscrew hole. This way you can double lock the pulley. As far as the proper name, we've always just stated it as a round shaft with 2 flats 180 degrees apart.

 

[er3456df]

er, is there any reason ya couldent use a round hole with a set screw on the flats?

If all it takes is using a different search phrase to find the right parts, I'd just as soon get em. But no, in this case I'm only using a 1/2hp motor so the set screw is probably plenty strong. And round holes are everywhere, so I'll probably just do it.

But for future reference, it'd be nice to know if they're out there somewhere.

 

[lilredex]

If you have difficulty keeping the pulley locked in place with just set screws, you could add slices (spacers) off another round shaft to fill in that gap. Small pockets in the spacers, for the set screws, would hold them in place.

That other double D looks like a scene, at the "EX" in Toronto!

 

[OccupantRJ]

That is called a flatted shaft. Also known as a double D