The AirTAC Airtac AIRTAC SCJ63 Standard Cylinder SCJ63X70-20S 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, 70mm nominal stroke, PT1/4 ports and adjustable end cushioning.
The SCJ63X70-20S is a double-acting, single-rod pneumatic cylinder with a 63 mm bore and a 70 mm nominal stroke, featuring a rear-cap adjusting screw that provides up to 20 mm of stroke-end reduction. This allows for precise, on-machine fine-tuning without replacing the cylinder. The built-in magnet enables direct mounting of CMSG/DMSG/EMSG sensors for reliable, non-contact position feedback.
At 0.5 MPa, this cylinder delivers 1559 N of push force and 1402 N of pull force, with the force difference due to the 20 mm piston rod. Its body length A(SCJ) is 197 mm, and it includes a 28 mm adjustable air cushion for smooth deceleration. The standard PT1/4 port and M16x1.5 rod thread ensure straightforward integration into existing pneumatic setups.
| Model | Airtac AIRTAC SCJ63 Standard Cylinder SCJ63X70-20S |
|---|---|
| Series | SCJ adjustable-stroke tie-rod cylinder |
| Bore size | Ø63 mm |
| Nominal stroke | 70 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. |
| ×70 | 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 20 mm adjustable stroke allows technicians to quickly dial in the exact end-stop position during machine commissioning, accommodating minor build tolerances without needing to swap out hard stops or shims.
Ideal for packaging or assembly lines with multiple product sizes. The stroke can be easily adjusted to handle different box heights or component positions, reducing changeover time and the need for multiple fixed-stroke cylinders.
In clamping or pressing applications, the adjustable stroke can be used to take up slack as tooling or contact surfaces wear over time, maintaining consistent clamping force and cycle time without immediate part replacement.
Choose the SCJ63X70-20S when you need a robust 63 mm bore cylinder with field-adjustable stroke for fine-tuning end positions. If your force requirement is lower, stepping down to a 50 mm bore SCJ offers a push force of 982 N at 0.5 MPa, while a step up to an 80 mm bore provides a substantial increase to 2513 N. For applications where the stroke is fixed and never needs adjustment, a standard SC series cylinder is a more economical choice.
This cylinder is a direct replacement for any AirTAC SCJ63X70-20S with a PT port, basic mounting, and a magnet. The 70 mm stroke is well within the 1500 mm maximum for this bore, so rod bending is not a primary concern, but always ensure the load is guided for long-life performance. If your application involves significant side loads, consider an external guide rail or a guided cylinder.
Adjustable-stroke checklist
The theoretical push force is 1559 N at 0.5 MPa and 2805 N at the maximum operating pressure of 0.9 MPa. The pull force is slightly lower at 1402 N at 0.5 MPa due to the area of the 20 mm piston rod. For a precise force calculation at your specific operating pressure, use the formula: Force = Pressure × Piston Area.
The stroke is adjusted via a screw on the rear cap that limits the piston's retraction distance, shortening the stroke by up to 20 mm from the nominal 70 mm. This SCJ63X70-20S is a direct form-and-function replacement for any AirTAC SCJ63 of the same bore, nominal stroke, and 20 mm adjust range, provided it has a PT port, basic mounting, and a magnet.
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