The AirTAC Airtac SCJ63 Standard Cylinder SCJ63X900-50S 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, 900mm nominal stroke, PT1/4 ports and adjustable end cushioning.
The SCJ63X900-50S is a double-acting, single-rod pneumatic cylinder with a field-adjustable stroke end, letting you fine-tune the 900 mm nominal stroke by up to 50 mm without swapping the unit. Its 63 mm bore delivers 1559 N of push force at 0.5 MPa, making it a capable mid-range actuator for positioning tasks that need on-machine tweaking.
This model includes a built-in magnet (suffix -S), so CMSG/DMSG/EMSG reed or solid-state sensors clamp directly onto the tie-rod barrel for reliable end-of-stroke detection. The 20 mm rod, PT1/4 ports, and 28 mm air cushion are standard for the bore, while the body length A(SCJ) of 197 mm provides a compact baseline for the adjustable mechanism.
| Model | Airtac SCJ63 Standard Cylinder SCJ63X900-50S |
|---|---|
| Series | SCJ adjustable-stroke tie-rod cylinder |
| Bore size | Ø63 mm |
| Nominal stroke | 900 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. |
| ×900 | 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.
During machine setup, the 50 mm rear adjusting screw lets technicians precisely set the 900 mm stroke end position without dismounting the cylinder, speeding up line commissioning.
Ideal for a 900 mm part-push or transfer station where the final stop point must be fine-tuned to accommodate slight fixture variations or part tolerances.
In high-cycle systems, the adjustable stroke can be periodically tweaked to compensate for mechanical wear in tooling or grippers, maintaining precise positioning over the cylinder's service life.
Choose the SCJ63X900-50S when your application requires a long 900 mm stroke with the ability to dial in the exact stop position during commissioning or product changeovers. If you need more force, step up to the 80 mm bore, which provides 2513 N of push at 0.5 MPa. For a simpler, fixed-stroke solution without the adjusting screw, the standard SC63X900 is the direct alternative. This cylinder replaces any AirTAC SCJ63 of the same 900 mm nominal stroke and 50 mm adjust range, with PT ports, basic mount, and a magnet. At this stroke length, rod buckling is a real risk under side loads; use an external guide rail or switch to a guided cylinder if the load is not perfectly axial.
Adjustable-stroke checklist
At 0.5 MPa, the push force is 1559 N and the pull force is 1402 N. The maximum push force at the 0.9 MPa operating limit is 2805 N. Because it is a single-rod cylinder, the push force is always greater than the pull force due to the rod area.
Yes, if you need the added 50 mm stroke-end adjustability. The SCJ63X900-50S shares the same bore, port size, and mounting footprint as the SC63, but the body is slightly longer to house the adjusting screw. Ensure your machine has clearance for the rear mechanism.
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