## Standard Cylinder Sizes

## Standard Cylinder Sizes

(OP)

I am looking for a table of standard cylinder sizes, bore and rod diameter for mm and inches.

I have found a table of ISO/metric cylinder sizes but it doesn't seem to cover cylinders with a bore over 200mm

The same goes for US/British units.

The ISO sizes do seem rather consistent with two options for ratios of the area. One option is the rod size area is about 70% of the cap size area. The second option is a rod size area of about 50% of the cap side area. I could simply just apply the same to the cylinders sizes in inches I know about like 2, 3.25, 4, 5, 6, and 8 but I know that presses use much bigger bore cylinders.

I am writing a program to compute cylinder sizes using the criteria I have written about in the H&P magazine.

The metric version is done but I had to extrapolate for bigger cylinder diameters.

It seems to me that once the cylinder bore are 6 inches or larger there is no standard and lots of options are available.

Much seems to be manufacturer dependent.

The problem I am trying to solve is that one can calculate the minimum cylinder diameters but reality is that one must chose the next size up that is available. I need a table of cylinder bores and rod diameters so I can find the next size up.

I have found a table of ISO/metric cylinder sizes but it doesn't seem to cover cylinders with a bore over 200mm

The same goes for US/British units.

The ISO sizes do seem rather consistent with two options for ratios of the area. One option is the rod size area is about 70% of the cap size area. The second option is a rod size area of about 50% of the cap side area. I could simply just apply the same to the cylinders sizes in inches I know about like 2, 3.25, 4, 5, 6, and 8 but I know that presses use much bigger bore cylinders.

I am writing a program to compute cylinder sizes using the criteria I have written about in the H&P magazine.

The metric version is done but I had to extrapolate for bigger cylinder diameters.

It seems to me that once the cylinder bore are 6 inches or larger there is no standard and lots of options are available.

Much seems to be manufacturer dependent.

The problem I am trying to solve is that one can calculate the minimum cylinder diameters but reality is that one must chose the next size up that is available. I need a table of cylinder bores and rod diameters so I can find the next size up.

Peter Nachtwey

Delta Computer Systems

http://www.deltamotion.com

http://forum.deltamotion.com/

## RE: Standard Cylinder Sizes

## RE: Standard Cylinder Sizes

https://www.duplomatic.com/assets/SchedeTecniche/G...

http://www.petr-hanz.com/ATOS/B241-ENG.pdf

http://www.utah-hydraulique.com/wp-content/uploads...

It's only up to 400 mm...

## RE: Standard Cylinder Sizes

What I am thinking about doing is rounding up calculated cylinder sizes to the next 25mm for sizes over 400mm.

I will do the same for cylinder sizes over 16 inches.

I will round up the rod diameters too when the cylinder diameters get to be that big.

Peter Nachtwey

Delta Computer Systems

http://www.deltamotion.com

http://forum.deltamotion.com/

## RE: Standard Cylinder Sizes

Peter Nachtwey

Delta Computer Systems

http://www.deltamotion.com

http://forum.deltamotion.com/

## RE: Standard Cylinder Sizes

## RE: Standard Cylinder Sizes

I've just seen your post. My email sent the notification to spam.

It seems to me that you are right, that all these cylinders over 320 mm are custom made.

The standard which can be found in manufacturer's datasheets is ISO 6022, and I've found a link to the preview of that standard:

https://www.sis.se/api/document/preview/906963/

Page 6 mentions bore sizes in a range from 50 to 320 mm.

Best,

Robert

## RE: Standard Cylinder Sizes

Question/opinions:

Which table to use?

When designing a press. the cylinder bores will often exceed those in the table. My cylinder sizing program calculates a cylinder bore size but it must be rounded up to some size that will be made. What increments should I use? 20mm, 1 inch, 2 inches?

Another option is to simply report the bore size that is necessary like 833mm and the let the user chose the next size up. I would also need to report the rod size and ask the user to round that up too. Then I can calculate the valve size.

I could simply ditch the whole table idea and force the user to pick the next higher bore diameter and lower rod size.

Peter Nachtwey

Delta Computer Systems

http://www.deltamotion.com

http://forum.deltamotion.com/

## RE: Standard Cylinder Sizes

Ted

## RE: Standard Cylinder Sizes

## RE: Standard Cylinder Sizes

Thanks guys.

Peter Nachtwey

Delta Computer Systems

http://www.deltamotion.com

http://forum.deltamotion.com/

## RE: Standard Cylinder Sizes

If you need a standard for the calculations, I have used references found in ABS standards as back up for calculations that need to be approved. For the end plates and other components. For any size cylinder. But these use alot larger safety factors then standard industrial customers making them more expensive.

## RE: Standard Cylinder Sizes

Peter Nachtwey

Delta Computer Systems

http://www.deltamotion.com

http://forum.deltamotion.com/

## RE: Standard Cylinder Sizes

One factor that may be revalent in chosing cylinder size is wether it is a push pull or pull only cylnders. For longer strokes with a push cylinder the rod must be a larger diameter and have a certain spacer inside to limit loads on the bearings. And more importantly the euler buckling loads. There are rules of thumb for this. The larger rod can sometimes or even often drive the cylinder to the next diameter. Your probally already aware of this.