The format of some part numbers has changed over the years.  Alkon had a slightly different numbering system (which we can easily cross reference) which included the date code.  This is the reason some old cylinder's numbers will not match up with the How To Order section of the series descriptions.

Some part numbers start with an "S" or "MS."  This is a Special cylinder (see Specials).  It was designed in house for an OEM application.

If you can't find any numbers on the cylinder, and you need to duplicate it, the best thing to do is send it to us.  Call 262-673-9255 and inform us of your intentions.

If you can't send it to us, and you can't see any numbers, the following information will be needed.

1. Bore size. 

To measure the bore size:

Measure the distance around the cylinder tube and divide by 6.28.  This will give you the radius including the thickness of the tubing (Aluminum cylinder tubing is 1/8 inch thick).  Subtract 1/4 inch, this is the inside radius.  Multiply by 2 for the bore size.

2 Tie Rods and length

3. Length from tip to tail.

4. Length of rod sticking out when fully retracted and fully extended.

5. Rod diameter.

6. Cushions  Front or rear or both?

Look for adjusting screws on faces other than port faces.

7.  Tubing material

8.  Any Stainless Steel

9.  Mounting options.

REMEMBER:    All cylinders are made to order, and sometimes non-returnable.