Airtac SCJ50 Standard Cylinder SCJ50X25-10STC
The AirTAC Airtac SCJ50 Standard Cylinder SCJ50X25-10STC is a genuine double-acting SINGLE-ROD air cylinder with a rear-cap ADJUSTING SCREW: the stroke end is field-adjustable within a 10 mm range without swapping the cylinder. Ø50mm bore, 25mm nominal stroke, PT1/4 ports and adjustable end cushioning.
- BoreØ50 mm
- Nominal stroke25 mm
- Stroke adjust-10 mm
- Port sizePT1/4
- Rod threadM16×1.5
- CushionAdjustable, 21 mm
About the Airtac SCJ50 Standard Cylinder SCJ50X25-10STC
The SCJ50X25-10STC is a double-acting, single-rod pneumatic cylinder from AirTAC, engineered for applications where the stroke end position must be precisely tuned on the machine. Its rear-cap adjusting screw provides a 10 mm field-adjustable range, allowing you to fine-tune the 25 mm nominal stroke during commissioning or format changes without swapping the cylinder. This model delivers a push force of 982 N at 0.5 MPa, with a 20 mm diameter piston rod and PT1/4 ports.
This specific configuration includes a built-in magnet (suffix S) for direct mounting of CMSG/DMSG/EMSG sensors, and a centre trunnion mount (suffix TC) with the TCM1 bracket, making it ideal for pivoting applications. The body length A is 194 mm, and the cylinder operates with a 21 mm air cushion for smooth deceleration. It is a genuine AirTAC tie-rod cylinder, built for reliable, repeatable performance in industrial automation.
Airtac SCJ50 Standard Cylinder SCJ50X25-10STC Technical Specifications
| Model | Airtac SCJ50 Standard Cylinder SCJ50X25-10STC |
|---|---|
| Series | SCJ adjustable-stroke tie-rod cylinder |
| Bore size | Ø50 mm |
| Nominal stroke | 25 mm |
| Stroke adjustment | Up to 10 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, 21 mm |
| Max stroke | Up to 1200 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.
Theoretical Output Force (Ø50mm)
| Pressure | Push force | Pull force |
|---|---|---|
| 0.5 MPa | 982 N | 825 N |
| 0.7 MPa | 1374 N | — |
| Max (@1.0 MPa) | 200 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.
Model Code: Airtac SCJ50 Standard Cylinder SCJ50X25-10STC
| SCJ | Adjustable-stroke tie-rod cylinder series. |
|---|---|
| 50 | Bore size in mm. |
| ×25 | Nominal (maximum) stroke length in mm. |
| -10 | 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.
Where the Airtac SCJ50 Standard Cylinder SCJ50X25-10STC Is Used
Commissioning & Setup
The 10 mm adjusting screw allows technicians to dial in the exact stroke end position during machine setup, compensating for minor variations in tooling or workpiece placement without needing to machine custom stops.
Part Ejection & Stops
Ideal for conveyor line diverters or part stops where the stroke end must be fine-tuned to accommodate different product sizes. The centre trunnion mount allows the cylinder to pivot as it actuates.
Clamping & Pressing
In light pressing or clamping fixtures, the adjustable stroke lets you set a precise end position to control the final clamp depth or pressure point, with sensor confirmation via the built-in magnet.
Is the Airtac SCJ50 Standard Cylinder SCJ50X25-10STC the Right Cylinder?
Choose the SCJ50 bore for general automation tasks needing up to 1767 N of push force at 0.9 MPa. If your application requires a higher force, step up to the SCJ63 bore, which provides 1559 N of push force at 0.5 MPa. For applications that do not require field-adjustable stroke, the fixed-stroke SC series is a more cost-effective alternative. This model is a direct replacement for any AirTAC SCJ adjustable-stroke cylinder with a 50 mm bore, 25 mm nominal stroke, a 10 mm adjust range, PT ports, a centre trunnion (TC) mount, and a magnet.
Adjustable-stroke checklist
- ✓ Need to fine-tune stroke on the line?
- ✓ Nominal stroke + adjust range (-10)
- ✓ Required force at your working pressure
- ✓ Port/thread type (PT/NPT/G)
- ✓ Magnet (-S) for sensors?
Installation & Maintenance Notes
- check Use clean air filtered to 40µm or finer.
- check Keep within 0.15 – 1.0 MPa operating pressure.
- check Set the rear adjusting screw, then lock it before running.
- check Adjust end cushion screws for smooth stops.
- check Use SCJ mounting accessory (FA / LB / TC / TCM1).
- check Installation by qualified personnel per AirTAC docs.
Airtac SCJ50 Standard Cylinder SCJ50X25-10STC FAQ
The rear-cap adjusting screw sets the physical stroke end position, allowing you to shorten the 25 mm nominal stroke by up to 10 mm. It is a mechanical stop, not a force or speed control. The cylinder will always extend to the position set by the screw.
At the standard operating pressure of 0.5 MPa, the push force is 982 N and the pull force is 825 N. The maximum push force at the 0.9 MPa operating limit is 1767 N. Because it is a single-rod cylinder, the push force is greater than the pull force due to the area of the 20 mm rod.
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