Airtac SCJ50 Standard Cylinder SCJ50X275-20S
The AirTAC Airtac SCJ50 Standard Cylinder SCJ50X275-20S 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. Ø50mm bore, 275mm nominal stroke, PT1/4 ports and adjustable end cushioning.
- BoreØ50 mm
- Nominal stroke275 mm
- Stroke adjust-20 mm
- Port sizePT1/4
- Rod threadM16×1.5
- CushionAdjustable, 21 mm
About the Airtac SCJ50 Standard Cylinder SCJ50X275-20S
The SCJ50X275-20S is a double-acting, single-rod pneumatic cylinder that puts fine stroke control directly into your hands. Its rear-cap adjusting screw provides a 20 mm field-adjustable range, allowing you to dial in the exact stroke end position without swapping the cylinder or adding external hard stops. With a 50 mm bore and a 20 mm rod, this tie-rod cylinder delivers a substantial 982 N of push force at 0.5 MPa, scaling up to 1767 N at its maximum operating pressure of 0.9 MPa.
This model includes a built-in magnet, coded by the -S suffix, enabling direct mounting of CMSG, DMSG, or EMSG sensors along the barrel for reliable, non-contact position feedback. The SCJ body length A is 194 mm, and the adjustable screw shortens the stroke end by up to 20 mm from the nominal 275 mm maximum. It uses a PT1/4 port and an M16x1.5 rod thread, making it a versatile workhorse for tasks requiring frequent, precise end-stop tuning.
Airtac SCJ50 Standard Cylinder SCJ50X275-20S Technical Specifications
| Model | Airtac SCJ50 Standard Cylinder SCJ50X275-20S |
|---|---|
| Series | SCJ adjustable-stroke tie-rod cylinder |
| Bore size | Ø50 mm |
| Nominal stroke | 275 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, 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 SCJ50X275-20S
| SCJ | Adjustable-stroke tie-rod cylinder series. |
|---|---|
| 50 | Bore size in mm. |
| ×275 | 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.
Where the Airtac SCJ50 Standard Cylinder SCJ50X275-20S Is Used
Commissioning & Setup
Ideal for machine builders who need to fine-tune the end-of-arm tooling position during initial commissioning. The 20 mm adjustment screw allows for quick, precise mechanical setup without reprogramming or changing hard stops.
Product Changeover
Perfect for packaging or assembly lines running multiple product sizes. Operators can quickly adjust the cylinder's stroke end to accommodate a new box height or component position, minimizing changeover downtime.
Wear Compensation
In high-cycle clamping or pressing applications, the adjustable stroke can compensate for wear on tooling or contact surfaces over time. A simple turn of the screw restores the precise clamping position, extending the life of your fixtures.
Is the Airtac SCJ50 Standard Cylinder SCJ50X275-20S the Right Cylinder?
Choose the SCJ50X275-20S when your application demands a robust mid-bore cylinder with an adjustable stroke for process fine-tuning. If you need more force, stepping up to a 63 mm bore provides 1559 N of push force at 0.5 MPa. For applications where the stroke is fixed and will never change, the standard SC50X275-S fixed-stroke cylinder is a simpler, more cost-effective choice. For a direct replacement, match the 50 mm bore, 275 mm nominal stroke, 20 mm adjust range, PT port thread, and the built-in magnet. As this is a 275 mm stroke, be mindful of side loads; if the rod is not guided externally, consider adding an external guide rail to prevent rod bending and ensure long seal life.
Adjustable-stroke checklist
- ✓ Need to fine-tune stroke on the line?
- ✓ Nominal stroke + adjust range (-20)
- ✓ 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 SCJ50X275-20S FAQ
The push force is 982 N at 0.5 MPa and 1767 N at 0.9 MPa. The pull force is lower due to the single 20 mm rod, providing 825 N at 0.5 MPa. The stroke-adjusting screw does not change the cylinder's force output.
Yes, the SCJ50X275-20S can replace an SC50X275-S if you need the ability to fine-tune the stroke end. The mounting footprint and port connections are identical. Ensure your application can accommodate the slightly longer body length of the SCJ series, which houses the rear adjusting mechanism.
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