The AirTAC Airtac SCJ50 Standard Cylinder SCJ50X225-20S is a genuine double-acting SINGLE-ROD air cylinder with a rear-cap ADJUSTING SCREW: the stroke end is field-adjustable within a 20 mm range without swapping the cylinder. Ø50mm bore, 225mm nominal stroke, PT1/4 ports and adjustable end cushioning.
The SCJ50X225-20S is a double-acting, single-rod AirTAC cylinder that lets you fine-tune the stroke end position by up to 20 mm via a rear-cap adjusting screw. With a 50 mm bore delivering 982 N of push force at 0.5 MPa, it handles mid-range clamping, pressing, and positioning tasks where the exact travel needs to be dialled in during commissioning or changeover.
This model includes a built-in magnet (-S suffix), so you can directly mount CMSG, DMSG, or EMSG reed or solid-state sensors on the barrel for reliable end-of-stroke detection. The 20 mm rod, PT1/4 ports, and 21 mm air cushion provide smooth, controlled motion across the full 225 mm nominal stroke.
| Model | Airtac SCJ50 Standard Cylinder SCJ50X225-20S |
|---|---|
| Series | SCJ adjustable-stroke tie-rod cylinder |
| Bore size | Ø50 mm |
| Nominal stroke | 225 mm |
| Stroke adjustment | Up to 20 mm (rear adjusting screw) |
| Acting type | Double acting (single rod) |
| Port size | PT1/4 |
| Rod thread | M16×1.5 |
| Fluid | Air (filtered by 40µm element) |
|---|---|
| Operating pressure | 0.15 – 1.0 MPa |
| Proof pressure | 1.5 MPa |
| Temperature | -20 to +70 °C |
| Speed range | 30 – 800 mm/s |
| Cushion | Adjustable, 21 mm |
| Max stroke | Up to 1200 mm |
Specifications follow the official AirTAC SCJ (adjustable-stroke) datasheet. The rear adjusting screw sets the stroke end position; force is the same as the equivalent single-rod SC bore. Confirm against the product label before installation. Thread options: PT (standard) / G.
| Pressure | Push force | Pull force |
|---|---|---|
| 0.5 MPa | 982 N | 825 N |
| 0.7 MPa | 1374 N | — |
| Max (@1.0 MPa) | 200 kgf | |
SCJ is single-rod, so force matches the equivalent SC bore: push uses the full bore area, pull subtracts the rod area. Actual usable force is lower than theoretical due to friction and back-pressure; size with a safety margin.
| SCJ | Adjustable-stroke tie-rod cylinder series. |
|---|---|
| 50 | Bore size in mm. |
| ×225 | Nominal (maximum) stroke length in mm. |
| -20 | Adjustable-stroke range in mm (options 10/20/30/40/50/75/100). |
| -S | Optional built-in magnet for sensor position sensing. |
Related types: SC (single rod, fixed stroke), SCD (double rod), SCT (multi-position). SCJ mounting: Basic, FA, LB, TC, TCM1. Seals: TPU standard / H = Viton / N = NBR. Thread: blank = PT, G = G thread.
Dial in the exact stop position during machine setup. The 20 mm adjust range lets technicians quickly compensate for assembly tolerances without machining custom stops.
Adjust the stroke end to accommodate different product sizes on a packaging or sorting line. The 225 mm nominal stroke provides ample reach, while the screw allows rapid reconfiguration.
Take up mechanical play in a clamping or pressing fixture over time. The rear screw can be advanced to maintain consistent final pressure as tooling wears, extending service intervals.
Choose the SCJ50X225-20S when you need a 50 mm bore's force class (982 N push at 0.5 MPa) and the ability to trim the stroke end without swapping the cylinder. If your force requirement is lower, the SCJ40 series provides 628 N push; for higher force, the SCJ63 steps up to 1559 N push. This adjustable-stroke unit is ideal for applications where the final position must be tuned on the machine, unlike a fixed-stroke SC cylinder.
For a drop-in replacement, match the 50 mm bore, 225 mm nominal stroke, 20 mm adjust range, PT port thread, basic mounting, and the -S magnet option. At this 225 mm stroke, ensure the rod is adequately guided if significant side loads are present; an external guide rail or switching to a guided cylinder may be necessary to prevent rod bending.
Adjustable-stroke checklist
At 0.5 MPa, the push force is 982 N and the pull force is 825 N. The push force is higher because the single rod reduces the piston area on the return side. Maximum operating force at 0.9 MPa is 1767 N push.
A screw in the rear cap sets the stroke end position. You can shorten the effective stroke by up to 20 mm from the 225 mm nominal maximum. It adjusts the mechanical stop point, not the air pressure or speed, allowing precise field tuning.
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