Thumbwheel size?

[Biodiversity_guy]

When setting up a rig for doubles, where does thumbwheel size factor into the equation.

1/4 x 20
3/8 x 16
8mm.

Am new to the whole doubles rig process, just trying to learn the terminology.

Thanks in advance.

 

[knowone]

All Thread or bolt, thread size, pitch.

 

[Pullmyfinger]

The thumbwheel size is in reference to the thread pitch and diameter of the bolts that came with your bands.
They're all different, my Dive Rite bands came with 1/4 x 20Threads Per Inch(TPI), all-thread.
You must be looking at the DSS rigs. If so, those delrin thumbwheels are nice.
The thumbwheels replace the wingnuts.
-Mitch

 

[cool_hardware52]

When setting up a rig for doubles, where does thumbwheel size factor into the equation.

1/4 x 20
3/8 x 16
8mm.


Am new to the whole doubles rig process, just trying to learn the terminology.

Thanks in advance.

In the US the most common tank band bolt size is 5/16 x 18 and the next most common is 3/8 x 16. You need to have the actual bands to be sure as most band makers have produced bands with both size fasteners.

It's always a good idea to have both sizes of wing nuts / thumbwheels in your Save a Dive kit as you will inevitably encounter a tanks with both.

Tobin

 

[Pullmyfinger]

I was mistaken, my Dive Rite bands came with 5/16 x 18 all thread.

-Mitch

 

[rjack321]

In the USA...
8" bands almost always come with 5/16" x 18 bolts
6.9", 7" and 7.25" bands often come with 3/8" x 16, less commonly with 5/16"

Some people have (rarely) swapped fasteners to metric.