Airtac SCJ50 Standard Cylinder SCJ50X500-20S
The AirTAC Airtac SCJ50 Standard Cylinder SCJ50X500-20S 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, 500mm nominal stroke, PT1/4 ports and adjustable end cushioning.
- BoreØ50 mm
- Nominal stroke500 mm
- Stroke adjust-20 mm
- Port sizePT1/4
- Rod threadM16×1.5
- CushionAdjustable, 21 mm
About the Airtac SCJ50 Standard Cylinder SCJ50X500-20S
The SCJ50X500-20S is a double-acting, single-rod pneumatic cylinder that puts fine stroke tuning directly into your hands via a rear-cap adjusting screw. With a 50 mm bore and a 500 mm nominal stroke, it delivers 982 N of push force at 0.5 MPa, while the 20 mm adjustment range lets you dial in the exact stroke end position without swapping the cylinder or adding external hard stops.
This model includes a built-in magnet (-S suffix), so you can clamp CMSG, DMSG, or EMSG reed and solid-state sensors directly onto the tie-rod barrel for reliable end-of-stroke detection. The 20 mm diameter piston rod, PT1/4 ports, and 21 mm air cushion work together to provide smooth, controlled motion across the full 30-800 mm/s speed range.
Airtac SCJ50 Standard Cylinder SCJ50X500-20S Technical Specifications
| Model | Airtac SCJ50 Standard Cylinder SCJ50X500-20S |
|---|---|
| Series | SCJ adjustable-stroke tie-rod cylinder |
| Bore size | Ø50 mm |
| Nominal stroke | 500 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 SCJ50X500-20S
| SCJ | Adjustable-stroke tie-rod cylinder series. |
|---|---|
| 50 | Bore size in mm. |
| ×500 | 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 SCJ50X500-20S Is Used
Commissioning & Fine-Tuning
During machine setup, the 20 mm adjusting screw allows engineers to precisely dial in the actuator's end stop without re-plumbing or replacing the cylinder, speeding up the commissioning process on packaging lines.
Format Changeovers
On a conveyor diverter or sorting gate, the adjustable stroke lets operators quickly adapt the cylinder's throw for different product sizes, minimizing downtime between production runs.
Wear Compensation
In high-cycle clamping or pressing fixtures, the screw can be advanced slightly over time to compensate for pad or tooling wear, maintaining consistent clamping force without replacing the actuator.
Is the Airtac SCJ50 Standard Cylinder SCJ50X500-20S the Right Cylinder?
Choose the SCJ50X500-20S when you need a half-meter stroke with the ability to trim the end position by up to 20 mm during commissioning or format changes. If your force requirement grows, stepping up to the 63 mm bore provides 1559 N of push at 0.5 MPa; for a lighter, more compact solution, the 40 mm bore delivers 628 N. For applications where the stroke never needs field adjustment, the fixed-stroke SC50X500 is a simpler, cost-effective alternative.
At a 500 mm stroke, be mindful of side loads on the 20 mm rod. If the load is not guided externally, consider adding an external guide rail or switching to a guided cylinder to prevent rod bending and premature seal wear. This SCJ replaces any AirTAC SCJ50X500-20S with the same PT port thread and magnet configuration.
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 SCJ50X500-20S FAQ
At 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 this is a single-rod cylinder, the push force is always greater than the pull force due to the rod area on the return side.
Yes, if you need the field-adjustable stroke feature. The SCJ50X500-20S matches the mounting footprint of an SC50X500 but adds a rear adjusting screw. Ensure your replacement matches the bore, nominal stroke, PT port thread, and the -S magnet option for sensor compatibility.
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