size of bolts in a hydraulic cylinder
size of bolts in a hydraulic cylinder
(OP)
hello,
i have an aluminum cylinder with an aluminum flange screwed into the end with (8) 1/4-20 bolts with a thread engagement of .375" for each bolt...
the bore of the cylinder is 2.625" and the input pressure will be 10,000 psi..
my question is:
are the 1/4-20 tapped holes in the 6061 alum cylinder strong enough to withstand the 10,000 psi?
i am trying to figure out if my thread engagement is way to shallow...
any help would be appreciated.
thanks,
brent
i have an aluminum cylinder with an aluminum flange screwed into the end with (8) 1/4-20 bolts with a thread engagement of .375" for each bolt...
the bore of the cylinder is 2.625" and the input pressure will be 10,000 psi..
my question is:
are the 1/4-20 tapped holes in the 6061 alum cylinder strong enough to withstand the 10,000 psi?
i am trying to figure out if my thread engagement is way to shallow...
any help would be appreciated.
thanks,
brent





RE: size of bolts in a hydraulic cylinder
I'd recommend you upsize to at least 5/16 or up to 3/8. Engage 1.5 to 2 diameters.
Ted
RE: size of bolts in a hydraulic cylinder
hydtools.
Do you think that there is screwed head glad and he using jackbolts?
http://www.crconline.com/Components/catalog.html
RE: size of bolts in a hydraulic cylinder
Jackbolts? Could be. Then the 1/4-20 screw strength would have no relation to the service load. Just the gland removal force. I took the description of screwed into the end with 1/4-20 screws to mean the flange is attached to the cylinder with the screws.
brents, more information?
Ted
RE: size of bolts in a hydraulic cylinder
i scrapped the 1/4-20 bolt idea, and I took the advice of going to 5/16-18 screws instead..
i tested the cylinder and it blew the seal at 8000 psi..
the seal was fine, the problem was the wall thickness where the bolts were..it blew the wall out everywhere the screws were.
the design is a bolt hole circle for the flange. the alum cylinder is 3.5" x 2.625" which is a .438" wall thickness..not bad except for the 5/16-18 holes left too thin of a wall...
i have redesigned the cylinder using 3.5" od x 2.250" ID, which now will give me plenty of wall thickness. i will still use the 5/16-18 screws which will be overkill, but thats ok by me...
my original design was just a little too powerful for what it was going to be used for..
i obviously wasn't thinking too great when i originally designed this...
this should work now,
thanks,
brent