Airtac SCJ50 Standard Cylinder SCJ50X75-50S
The AirTAC Airtac SCJ50 Standard Cylinder SCJ50X75-50S is a genuine double-acting SINGLE-ROD air cylinder with a rear-cap ADJUSTING SCREW: the stroke end is field-adjustable within a 50 mm range without swapping the cylinder. Ø50mm bore, 75mm nominal stroke, PT1/4 ports and adjustable end cushioning.
- BoreØ50 mm
- Nominal stroke75 mm
- Stroke adjust-50 mm
- Port sizePT1/4
- Rod threadM16×1.5
- CushionAdjustable, 21 mm
About the Airtac SCJ50 Standard Cylinder SCJ50X75-50S
The SCJ50X75-50S is a double-acting, single-rod pneumatic cylinder with a rear adjusting screw that provides up to 50 mm of field-adjustable stroke reduction. This allows precise end-position tuning without swapping the cylinder, ideal for commissioning and format changes. With a 50 mm bore and 20 mm rod, it delivers 982 N of push force and 825 N of pull force at 0.5 MPa, making it a strong mid-range actuator.
This model includes a built-in magnet, enabling direct mounting of CMSG/DMSG/EMSG sensors for reliable end-of-stroke detection. The standard PT1/4 ports and M16x1.5 rod thread ensure easy integration with common pneumatic fittings and tooling. The body length A(SCJ) is 194 mm, and the adjustable air cushion decelerates the piston smoothly over 21 mm at each end.
Airtac SCJ50 Standard Cylinder SCJ50X75-50S Technical Specifications
| Model | Airtac SCJ50 Standard Cylinder SCJ50X75-50S |
|---|---|
| Series | SCJ adjustable-stroke tie-rod cylinder |
| Bore size | Ø50 mm |
| Nominal stroke | 75 mm |
| Stroke adjustment | Up to 50 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 SCJ50X75-50S
| SCJ | Adjustable-stroke tie-rod cylinder series. |
|---|---|
| 50 | Bore size in mm. |
| ×75 | Nominal (maximum) stroke length in mm. |
| -50 | 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 SCJ50X75-50S Is Used
Commissioning & Setup
Engineers can precisely dial in the cylinder's end position during machine commissioning. The 50 mm adjustment range eliminates the need to fabricate custom shims or stops, drastically reducing setup time on new assembly lines.
Wear Compensation
In clamping or pressing operations, the adjustable stroke can be used to take up mechanical wear on tooling or workpieces over time. A simple turn of the rear screw restores the correct clamping position without any disassembly.
Multi-Product Stops
On a packaging line running different box sizes, the SCJ50X75-50S can act as a programmable stop gate. The operator can quickly adjust the stroke to match the new product dimensions, enabling a rapid changeover between batches.
Is the Airtac SCJ50 Standard Cylinder SCJ50X75-50S the Right Cylinder?
Choose the SCJ50 when the 40 mm bore's 628 N push force is insufficient but the 63 mm bore's 1559 N is excessive for your load. This 50 mm adjustable-stroke cylinder is perfect when you need to fine-tune the stroke end point on the machine. If your application requires a fixed, non-adjustable stroke, the standard SC50 series is a more economical alternative. For direct replacement, match the 50 mm bore, 75 mm nominal stroke, 50 mm adjust range, PT ports, and the -S magnet option.
For strokes of 300 mm or more, consider the potential for side-loading and rod bending. An external guide rail or switching to a guided cylinder assembly will protect the rod and seals from premature wear, ensuring a longer service life in demanding applications.
Adjustable-stroke checklist
- ✓ Need to fine-tune stroke on the line?
- ✓ Nominal stroke + adjust range (-50)
- ✓ 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 SCJ50X75-50S FAQ
The theoretical push force is 982 N at 0.5 MPa and 1767 N at 0.9 MPa. The pull force on the rod side is slightly lower due to the rod area, providing 825 N at 0.5 MPa. The adjustable stroke screw does not alter the cylinder's force output.
Yes, if you need the ability to fine-tune the stroke end. The SCJ50X75-50S shares the same bore, port, and mounting dimensions as the SC50. Ensure the 50 mm adjustment range covers your stroke reduction needs and that your control system can use the built-in magnet for sensor feedback.
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