4-035-01-0054 R412015138 4035010054 CYLINDER ISO 15552 PRA D 40mm HUB 320mm G1/4

When the PRA cylinder on a Homag machine stops holding position or starts leaking at the cushioning adjuster, the machine is down until a replacement is fitted. A 40 mm bore cylinder with a 320 mm stroke that no longer cushions correctly can let the head or clamp drift, causing scrap or a collision. This cylinder is the direct replacement for that position.

It carries Homag model numbers 4-035-01-0054 and 4035010054, and the R412015138 reference. Confirm the fit by matching those numbers against the machine's parts list, then checking the bore and stroke on the old cylinder.

The G1/4 ports take the existing fittings, and the M12x1.25 piston rod thread accepts the original rod end. Pneumatic adjustable cushioning is set at the adjuster screws; set it to suit the load so the stroke ends without shock. Pressure for determining piston forces is 6.3 bar.

Supply is the cylinder as described; no packing or customisation details are stated, so confirm those with the supplier. Stroke maximum for this range is 1900 mm, which is not this cylinder's stroke. Send the Homag model number, the R412015138 reference, the 40 mm bore and 320 mm stroke, and a photo of the mounting and ports with your enquiry.

What the specification fixes, and what it leaves to the machine:

• Bore matching — A 40 mm piston diameter matches the original PRA cylinder, so piston force at 6.3 bar stays as designed.
• Stroke length — The 320 mm stroke suits the machine position; check the old cylinder's stroke before ordering.
• Standard mounting —
• Port connection — G1/4 ports accept the existing air fittings, keeping hose routing unchanged during the swap.
• Rod thread — The M12x1.25 piston rod thread takes the original rod end, so alignment is kept.
• Cushioning adjustment — Pneumatic adjustable cushioning lets you set the end-of-stroke deceleration to the load.
• Double-acting operation — Air is applied to both sides, giving controlled motion in extend and retract directions.
• Single rod — A single piston rod matches the original arrangement, so the rod end bracket fits as before.
• Spare identification — Homag numbers 4-035-01-0054 and 4035010054 let you match the part to the machine's list.
• Stroke range — The 1900 mm stroke maximum for this range shows the cylinder sits within a standard family.
• Use — built for workshop gluing, on a bench beside the press or assembly table.
• Setup — positioned on the bench and set to the board thickness; no machine modification is involved.

What changes on the shop floor once the unit is in place:

• Direct replacement fit. Because the bore is 40 mm and the stroke 320 mm, the cylinder drops into the original position without reworking brackets or hose lengths.
• Fewer setup changes.
• Controlled end of stroke. Pneumatic adjustable cushioning lets you tune deceleration at each end, which reduces shock on the load and the machine frame.
• Correct force at working pressure. The 6.3 bar pressure for determining piston forces matches the original specification, so clamping or pushing force stays as designed.
• Rod end compatibility. The M12x1.25 piston rod thread accepts the original rod end, so alignment with the moving part is kept without new hardware.
• Easy identification. Homag model numbers 4-035-01-0054 and 4035010054 plus R412015138 let you check the part against the machine's parts list before ordering.
• Known stroke family. A 1900 mm stroke maximum for the range confirms this 320 mm unit is a standard length, so replacement sourcing is straightforward.
• It replaces a manual step. A brush, a pot and a bench are all the unit needs; the glue is metered by the roller instead of by hand.
• Downtime measured in minutes, not days. A replacement held on the shelf turns a worn part into a changeover instead of a stopped line.