Airtac SCJ50 Standard Cylinder SCJ50X250-100S
The AirTAC Airtac SCJ50 Standard Cylinder SCJ50X250-100S is a genuine double-acting SINGLE-ROD air cylinder with a rear-cap ADJUSTING SCREW: the stroke end is field-adjustable within a 100 mm range without swapping the cylinder. Ø50mm bore, 250mm nominal stroke, PT1/4 ports and adjustable end cushioning.
- BoreØ50 mm
- Nominal stroke250 mm
- Stroke adjust-100 mm
- Port sizePT1/4
- Rod threadM16×1.5
- CushionAdjustable, 21 mm
About the Airtac SCJ50 Standard Cylinder SCJ50X250-100S
The SCJ50X250-100S is a double-acting, single-rod pneumatic cylinder from AirTAC, engineered with a rear-cap adjusting screw that provides a 100mm field-adjustable stroke range. This allows you to fine-tune the end position of the 250mm nominal stroke without replacing the cylinder, making it ideal for commissioning and format changeovers. At 0.5 MPa, it delivers 982 N of push force and 825 N on the pull stroke, with a 20mm diameter piston rod and PT1/4 ports.
This model includes a built-in magnet (-S suffix), enabling direct mounting of CMSG, DMSG, or EMSG reed and solid-state sensors along the tie-rod barrel for precise end-of-stroke detection. The cylinder body length (A dimension) is 194 mm, and it features an adjustable air cushion for smooth deceleration. It operates on filtered air from 0.15 to 1.0 MPa and is a genuine AirTAC component, ensuring reliable performance in dynamic industrial applications.
Airtac SCJ50 Standard Cylinder SCJ50X250-100S Technical Specifications
| Model | Airtac SCJ50 Standard Cylinder SCJ50X250-100S |
|---|---|
| Series | SCJ adjustable-stroke tie-rod cylinder |
| Bore size | Ø50 mm |
| Nominal stroke | 250 mm |
| Stroke adjustment | Up to 100 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 SCJ50X250-100S
| SCJ | Adjustable-stroke tie-rod cylinder series. |
|---|---|
| 50 | Bore size in mm. |
| ×250 | Nominal (maximum) stroke length in mm. |
| -100 | 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 SCJ50X250-100S Is Used
Commissioning & Process Tuning
The 100mm adjustment range allows engineers to dial in the exact stroke end position during initial machine setup and fine-tune it for optimal process timing without swapping out hard stops or cylinders.
Format Changeovers on Packaging Lines
Quickly adapt the cylinder's stroke to handle different box or product sizes. The rear screw adjustment enables a fast mechanical changeover, reducing downtime on multi-format packaging and conveying systems.
Wear Compensation in Clamping
In high-cycle clamping or pressing operations, the adjustable stroke can be periodically extended to compensate for wear on tooling or contact surfaces, maintaining consistent clamping force and part quality over time.
Is the Airtac SCJ50 Standard Cylinder SCJ50X250-100S the Right Cylinder?
Select the SCJ50X250-100S when you need a mid-range force actuator with the flexibility to adjust the stroke end by up to 100mm on the machine. If your application requires more force, consider stepping up to the 63mm bore SCJ63 series, which provides 1559 N of push force at the same 0.5 MPa pressure. For applications needing a fixed, non-adjustable stroke, the standard SC50 series is a more economical choice. This cylinder is a direct replacement for another AirTAC SCJ50 cylinder with a 250mm nominal stroke, 100mm adjust range, PT ports, and a built-in magnet.
For this 250mm stroke length, be mindful of side loads. The 20mm rod can be subject to bending under significant radial force. If your application involves a non-axial load, it is best practice to use an external guide rail or switch to a guided cylinder assembly to protect the rod and bearing from premature wear.
Adjustable-stroke checklist
- ✓ Need to fine-tune stroke on the line?
- ✓ Nominal stroke + adjust range (-100)
- ✓ 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 SCJ50X250-100S FAQ
At the standard operating pressure of 0.5 MPa, the push force is 982 N and the pull force is 825 N. The push force is greater because the single piston rod reduces the effective piston area on the return stroke. The maximum theoretical force at 1.0 MPa is 200 kgf.
It is a direct physical and functional replacement for any AirTAC SCJ50 cylinder with a 250mm nominal stroke and a 100mm adjustment range. To ensure full compatibility, you must also match the port thread (PT), the built-in magnet option (-S), and your chosen mounting accessory. It is not dimensionally interchangeable with ISO 15552 cylinders.
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