[AT] hyd cylinder different inlet threads?

[John Hall]

Yeah, didn't think about that regarding the pipe thread.
  I imagine its just a straight thread and is either an actual port so 
an O-ring seals in the taper, or it has a flanged washer that is screwed 
down the face of the cylinder with an O-ring in the washer 
underneath(seen some BSPP stuff like that).
Many years back we used to make tons of hydraulic heads and caps. The 
ports are rather obvious as there will be a definite spotface, then a 
large chamfer, then the thread---transition radius between all features. 
The threads were normally unusual sizes, I've cut them from 9/16 up to 1 
5/8. FWIW ports go by number.

John Hall

On 5/8/2017 11:28 PM, Dennis Johnson wrote:
> Would not be straight pipe. Straight and Tapered pipe threads will screw together, but they just fit and seal poorly.
>
> Dennis
>
>
> Sent from my iPad
>
>> On May 8, 2017, at 8:53 PM, John Hall <jtchall at nc.rr.com> wrote:
>>
>> Maybe straight pipe, NPS?
>>
>> John Hall
>>
>>> On 5/8/2017 11:08 AM, Len Rugen wrote:
>>> I had to buy a replacement hydraulic cylinder.  Every one I've ever had had 1/2" pipe threads.  When I tried to put my hose on, I couldn't get the treads to start... then I looked closer.  WAY smaller.  The plastic shipping plug had a O-ring, doesn't look like tapered pipe threads.
>>> Sigh, this wouldn't be so bad if it wasn't 20 miles one way.
>>>
>>> Len Rugen
>>>
>>> rugenl at yahoo.com
>>>
>>>
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