Airtac SCJ50 Standard Cylinder SCJ50X450-20S
The AirTAC Airtac SCJ50 Standard Cylinder SCJ50X450-20S 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, 450mm nominal stroke, PT1/4 ports and adjustable end cushioning.
- BoreØ50 mm
- Nominal stroke450 mm
- Stroke adjust-20 mm
- Port sizePT1/4
- Rod threadM16×1.5
- CushionAdjustable, 21 mm
About the Airtac SCJ50 Standard Cylinder SCJ50X450-20S
The SCJ50X450-20S is a double-acting, single-rod pneumatic cylinder with a field-adjustable stroke end, letting you fine-tune the 450 mm nominal stroke by up to 20 mm without removing the cylinder. This model includes a built-in magnet, so CMSG/DMSG/EMSG sensors clamp directly onto the tie-rod barrel for reliable end-of-stroke detection.
With a 20 mm rod and PT1/4 ports, it delivers 982 N of push force at 0.5 MPa and up to 1767 N at the maximum operating pressure of 0.9 MPa. The 21 mm air cushion at each end decelerates the piston smoothly, and the body length A(SCJ) is 194 mm plus the 450 mm stroke, making it a compact solution for longer-travel applications that need adjustable end-position control.
Airtac SCJ50 Standard Cylinder SCJ50X450-20S Technical Specifications
| Model | Airtac SCJ50 Standard Cylinder SCJ50X450-20S |
|---|---|
| Series | SCJ adjustable-stroke tie-rod cylinder |
| Bore size | Ø50 mm |
| Nominal stroke | 450 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 SCJ50X450-20S
| SCJ | Adjustable-stroke tie-rod cylinder series. |
|---|---|
| 50 | Bore size in mm. |
| ×450 | 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 SCJ50X450-20S Is Used
Commissioning Fine-Tuning
During machine setup, the 20 mm adjusting screw allows operators to dial in the exact end-stop position for a 450 mm stroke without swapping cylinders or machining hard stops.
Format Changeover
On packaging or assembly lines that switch between product sizes, the adjustable stroke lets you quickly reset the cylinder's end position to accommodate a new format.
Wear Compensation
In long-running automation, the screw can be advanced slightly to take up mechanical wear in the tooling or linkage, maintaining precise positioning over time.
Is the Airtac SCJ50 Standard Cylinder SCJ50X450-20S the Right Cylinder?
Choose the SCJ50X450-20S when you need a mid-range force output with the flexibility to trim the stroke end during commissioning or format changes. If your load requires more force, stepping up to the 63 mm bore provides 1559 N of push at 0.5 MPa. For applications that do not need stroke adjustability, the fixed-stroke SC50X450 is a direct alternative. This 450 mm stroke is within the standard range, but always check for side-loading on a rod this extended; an external guide or a guided cylinder is recommended if the load is not perfectly axial. A direct replacement must match the 50 mm bore, 450 mm stroke, 20 mm adjust range, PT ports, and the integrated magnet.
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 SCJ50X450-20S FAQ
At 0.5 MPa, the push force is 982 N and the pull force is 825 N. At the maximum operating pressure of 0.9 MPa, the push force reaches 1767 N.
A rear-cap adjusting screw lets you shorten the stroke end by up to 20 mm. The 450 mm is the nominal maximum stroke, and the screw provides field-adjustable fine-tuning of the piston's stop position.
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