The AirTAC Airtac AIRTAC SCJ63 Standard Cylinder SCJ63X900-20S 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. Ø63mm bore, 900mm nominal stroke, PT1/4 ports and adjustable end cushioning.
The SCJ63X900-20S is a double-acting, single-rod pneumatic cylinder with a field-adjustable stroke end, offering a nominal 900 mm stroke that can be precisely shortened by up to 20 mm via a rear-cap adjusting screw. This 63 mm bore model delivers a substantial 1559 N of push force at 0.5 MPa, making it a powerful actuator for heavy-duty automation tasks where fine-tuning the end position is critical during commissioning or format changes.
Equipped with a built-in magnet (-S suffix), this cylinder allows for direct mounting of CMSG/DMSG/EMSG reed or solid-state sensors along the tie-rod barrel for reliable, non-contact position sensing. The 20 mm rod, PT1/4 ports, and 28 mm air cushion provide a robust and controlled motion profile, with a body length A(SCJ) of 197 mm plus the 900 mm stroke.
| Model | Airtac AIRTAC SCJ63 Standard Cylinder SCJ63X900-20S |
|---|---|
| Series | SCJ adjustable-stroke tie-rod cylinder |
| Bore size | Ø63 mm |
| Nominal stroke | 900 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, 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. |
| -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.
The 900 mm stroke moves parts between distant conveyor lines, while the 20 mm adjustment allows operators to fine-tune the final placement position without reprogramming a servo.
Adjust the stroke end to compensate for varying pallet heights or product stack tolerances, ensuring a consistent push-off position with 2805 N of force at 0.9 MPa.
During machine setup, the adjusting screw lets technicians quickly dial in the exact stop point. Over time, the same screw can be used to take up mechanical wear in the tooling, extending service intervals.
Select this SCJ63 model when you need a robust 63 mm bore actuator with a long 900 mm throw and the ability to dial in the exact stroke end point. If your force requirement is lower, stepping down to a 50 mm bore (982 N push at 0.5 MPa) can reduce air consumption; for higher force, the 80 mm bore delivers 2513 N. For this 900 mm stroke, carefully manage side loads to prevent rod bending—consider an external guide rail or a guided cylinder if the load is not perfectly axial. This is a direct replacement for another AirTAC SCJ63X900-20S with a PT port, basic mount, and magnet.
Adjustable-stroke checklist
A threaded screw in the rear cap acts as an internal stop for the piston, allowing you to shorten the 900 mm nominal stroke by up to 20 mm. This sets the retracted end position, and the cylinder will always return to this adjusted point. It does not change the cylinder's force or speed.
At 0.5 MPa, the push force is 1559 N and the pull force is 1402 N. At the maximum operating pressure of 1.0 MPa, the theoretical push force is 318 kgf. The pull force is lower due to the area of the 20 mm piston rod.
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