The AirTAC Airtac SCJ63 Standard Cylinder SCJ63X225-20S 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, 225mm nominal stroke, PT1/4 ports and adjustable end cushioning.
The SCJ63X225-20S is a double-acting, single-rod AirTAC cylinder with a 20 mm field-adjustable stroke range, letting you fine-tune the stroke end without removing the unit. Its 63 mm bore delivers a push force of 1559 N at 0.5 MPa and up to 2805 N at 0.9 MPa, making it a solid mid-range workhorse for positioning tasks.
This model includes a built-in magnet (-S suffix), so CMSG/DMSG/EMSG sensors clamp directly onto the tie-rod barrel for reliable end-of-stroke detection. The 20 mm rod, M16x1.5 knuckle thread, and 28 mm air cushion provide smooth deceleration, while the PT1/4 ports keep plumbing simple.
| Model | Airtac SCJ63 Standard Cylinder SCJ63X225-20S |
|---|---|
| Series | SCJ adjustable-stroke tie-rod cylinder |
| Bore size | Ø63 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, 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. |
| ×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.
The 20 mm rear adjusting screw allows operators to dial in the exact push-stroke endpoint during machine commissioning, compensating for fixture tolerances without reprogramming the controller.
Use the adjustable stroke to fine-tune the travel of a diverter gate on a conveyor. The built-in magnet provides clean sensor feedback to the PLC for each cycle, even after stroke adjustments.
In clamping or pressing applications, the stroke can be gradually extended via the rear screw to compensate for pad wear, maintaining consistent clamp force without immediate maintenance.
Choose this 63 mm bore when a 50 mm unit (982 N push at 0.5 MPa) is slightly underpowered, but a jump to an 80 mm bore (2513 N) is too bulky. The 20 mm adjust range is ideal for commissioning tweaks or wear take-up on a 225 mm stroke. If your stroke never needs field changes, a fixed-stroke SC63X225-S is a simpler alternative.
For replacement, match the SCJ63 bore, 225 mm nominal stroke, 20 mm adjust range, PT port thread, and the -S magnet suffix. At 225 mm, rod deflection under side load is minimal, but if the load is not guided, consider an external guide rail to protect the rod bearing.
Adjustable-stroke checklist
At 0.5 MPa, the push force is 1559 N and the pull force is 1402 N (due to the 20 mm single rod). The maximum push force at 0.9 MPa operating pressure is 2805 N.
Yes, if you need the 20 mm adjustable stroke feature. The SCJ63X225-20S shares the same bore, port (PT1/4), and mounting accessories (FA, LB, TC). Ensure your sensor setup is compatible with the -S magnet option.
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