The AirTAC Airtac SCJ63 Standard Cylinder SCJ63X250-50SH is a genuine double-acting SINGLE-ROD air cylinder with a rear-cap ADJUSTING SCREW: the stroke end is field-adjustable within a 50 mm range without swapping the cylinder. Ø63mm bore, 250mm nominal stroke, PT1/4 ports and adjustable end cushioning.
The SCJ63X250-50SH is a double-acting, single-rod pneumatic cylinder that puts field-adjustable stroke control directly onto your machine. A rear-cap adjusting screw lets you shorten the stroke end by up to 50 mm without swapping the cylinder, making it ideal for commissioning trials, format changeovers, or taking up mechanical wear. With a 63 mm bore and 20 mm rod, it delivers 1559 N of push force at 0.5 MPa and 2805 N at the 0.9 MPa maximum operating pressure.
This model is factory-configured with a built-in magnet (-S) for direct mounting of CMSG/DMSG/EMSG sensors, and Viton (FKM) seals (-H) that extend the operating temperature range to 0–150 °C for hot or aggressive environments. The 28 mm air cushion decelerates the piston smoothly at both ends, and the PT1/4 port threads match standard pneumatic fittings. Body length A is 197 mm plus stroke, and the tie-rod construction keeps service straightforward.
| Model | Airtac SCJ63 Standard Cylinder SCJ63X250-50SH |
|---|---|
| Series | SCJ adjustable-stroke tie-rod cylinder |
| Bore size | Ø63 mm |
| Nominal stroke | 250 mm |
| Stroke adjustment | Up to 50 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, 28 mm |
| Max stroke | Up to 1500 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 | 1559 N | 1402 N |
| 0.7 MPa | 2182 N | — |
| Max (@1.0 MPa) | 318 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. |
|---|---|
| 63 | Bore size in mm. |
| ×250 | Nominal (maximum) stroke length in mm. |
| -50 | 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.
The 50 mm adjustable stroke lets technicians dial in the exact end-stop position during machine bring-up without swapping cylinders or machining external hard stops.
Quickly adjust the stroke to suit different product sizes on a packaging or assembly line. One cylinder handles multiple recipes, reducing changeover time and spare parts inventory.
As tooling or gripper pads wear over thousands of cycles, the rear screw can be advanced to take up the slack and restore precise positioning without replacing the actuator.
Choose the SCJ63 bore when the 40 mm bore's 628 N push at 0.5 MPa is too light; if you need more force, the 80 mm bore delivers 2513 N at the same pressure. The adjustable-stroke SCJ is the right pick whenever you need to fine-tune the stroke end position on the machine—during setup, after tooling changes, or to compensate for process drift. If your application needs a fixed, repeatable stroke with no adjustment, the standard SC series is a simpler, lower-cost alternative.
For a direct replacement, match bore (63 mm), nominal stroke (250 mm), adjustable range (-50), PT port thread, and the magnet and Viton seal options. This SCJ uses basic mounting; if you need a pivot mount, order the TC centre trunnion with the F-SC63TC bracket. At a 250 mm stroke, rod deflection is generally manageable, but for offset loads or high side forces, add an external guide rail or switch to a guided cylinder.
Adjustable-stroke checklist
At 0.5 MPa, push force is 1559 N and pull force is 1402 N. At the maximum operating pressure of 0.9 MPa, push force reaches 2805 N. Because it is a single-rod cylinder, push force is always greater than pull force due to the rod area on the return side.
Yes, if you need the adjustable stroke feature. The SCJ63X250-50SH shares the same bore, nominal stroke, port size (PT1/4), and mounting accessories as the SC63 series. Ensure the rear adjusting screw housing does not interfere with your existing mounting envelope, and match the magnet (-S) and seal material (-H) if your current cylinder uses them.
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