Othmro SDA100x20 Sealing Thin Air Cylinders Pneumatic Air Cylinders 3.94inch Bore 0.79inch Stroke Air Cylinders Aluminium Alloy Pneumatic Components for Pneumatic and Hydraulic Systems

I used these to replace some smaller air cylinders I bought from Mc Master. These are 50% bigger meaning they apply 50% more load than what I had. Other than the npt fittings, they use metric bolts for mounting and for attachment to the loading shaft. It was much harder to find the large metric shaft bolt that the English threaded shaft bolt on the Mc Master cylinder.Also, as it turns out, there is a fairly small throttling hole leading into the cylinder which significantly reduces the flow into the cylinder. Apparently this is for smoother action. The Mc Master cylinder also had a throttling hole but it was bigger so I took the cylinder apart and drilled it out a bit since speed of operation is important in my application. It comes apart easily and goes back together easily.