Airtac SCJ50 Standard Cylinder SCJ50X80-20
The AirTAC Airtac SCJ50 Standard Cylinder SCJ50X80-20 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, 80mm nominal stroke, PT1/4 ports and adjustable end cushioning.
- BoreØ50 mm
- Nominal stroke80 mm
- Stroke adjust-20 mm
- Port sizePT1/4
- Rod threadM16×1.5
- CushionAdjustable, 21 mm
About the Airtac SCJ50 Standard Cylinder SCJ50X80-20
The SCJ50X80-20 is a 50 mm bore double-acting single-rod cylinder with a field-adjustable stroke, letting you trim the stroke end by up to 20 mm via the rear-cap screw. It delivers 982 N of push force at 0.5 MPa and 1767 N at the 0.9 MPa maximum operating pressure, making it a strong mid-range actuator for tasks that need precise end-position tuning.
Built on the proven SC tie-rod platform, this model uses a 20 mm diameter piston rod, PT1/4 ports, and an M16x1.5 rod thread. The adjustable cushion decelerates the load smoothly, and the body length A(SCJ) is 194 mm. It is a genuine AirTAC component, ready for commissioning trials and format changeovers where a fixed 80 mm stroke would be too rigid.
Airtac SCJ50 Standard Cylinder SCJ50X80-20 Technical Specifications
| Model | Airtac SCJ50 Standard Cylinder SCJ50X80-20 |
|---|---|
| Series | SCJ adjustable-stroke tie-rod cylinder |
| Bore size | Ø50 mm |
| Nominal stroke | 80 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 SCJ50X80-20
| SCJ | Adjustable-stroke tie-rod cylinder series. |
|---|---|
| 50 | Bore size in mm. |
| ×80 | 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 SCJ50X80-20 Is Used
Commissioning & Setup
Fine-tune the end position of a clamp or stop during machine commissioning without re-mounting the cylinder, saving hours of mechanical adjustment.
Product Format Changeover
Quickly adjust the stroke end for different box or pallet sizes on a packaging line, eliminating the need for multiple fixed-stroke cylinders.
Wear Compensation
Take up mechanical wear in a pressing or crimping station by advancing the stroke end 5-10 mm, restoring the tool's bottom-dead-centre position.
Is the Airtac SCJ50 Standard Cylinder SCJ50X80-20 the Right Cylinder?
Choose the SCJ50X80-20 when you need to dial in the stroke end on the machine, such as during initial setup or when switching between product sizes. If 982 N of push force at 0.5 MPa is insufficient, step up to the 63 mm bore (SCJ63) which provides 1559 N at the same pressure. For a purely fixed 80 mm stroke with no adjustment, the standard SC50X80 is a simpler alternative.
This cylinder replaces another AirTAC SCJ50 adjustable-stroke unit of the same 80 mm nominal stroke and 20 mm adjust range, with PT ports and basic mounting. If your application involves a long unsupported rod extension, consider an external guide rail or a guided cylinder to protect the 20 mm rod from side-load bending.
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 SCJ50X80-20 FAQ
At 0.5 MPa, the push force is 982 N and the pull force is 825 N (the difference is due to the single 20 mm rod). 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 80 mm in the model code is the nominal maximum stroke; you can field-set any effective stroke between 60 mm and 80 mm without changing the cylinder.
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