Monarch 661002 35TX10-125 Tie Rod Cylinder

Functionally, a tie rod cylinder like this one uses threaded rods to hold the end caps onto the cylinder barrel. This design is common in hydraulic applications where a robust and easily serviceable cylinder is needed.

For this Monarch Industries tie rod cylinder, 661002 is the supplier part number, and 35TX10-125 shows up as the model identifier tied to the product name. They are two different references for the same cylinder.

Tie rod cylinders use external steel rods to hold the end caps to the barrel under pressure, which makes them easier to service and rebuild compared to welded designs. This is indeed the Monarch Industries 661002, model 35TX10-125, so if that part number matches what you pulled off your old unit or your parts list, you're looking at the right one.