Airtac SCJ50 Standard Cylinder SCJ50X80-30S
The AirTAC Airtac SCJ50 Standard Cylinder SCJ50X80-30S is a genuine double-acting SINGLE-ROD air cylinder with a rear-cap ADJUSTING SCREW: the stroke end is field-adjustable within a 30 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-30 mm
- Port sizePT1/4
- Rod threadM16×1.5
- CushionAdjustable, 21 mm
About the Airtac SCJ50 Standard Cylinder SCJ50X80-30S
The SCJ50X80-30S is a double-acting, single-rod pneumatic cylinder that puts stroke-end adjustment directly on the machine. Its rear-cap screw lets you shorten the nominal 80 mm stroke by up to 30 mm in the field, making it a practical choice for commissioning trials, format changeovers, or taking up mechanical wear. The built-in magnet allows CMSG/DMSG/EMSG sensors to clamp onto the tie-rod barrel for rod-position feedback.
At 0.5 MPa this 50 mm bore delivers 982 N pushing and 825 N pulling, while at the maximum operating pressure of 0.9 MPa the push force reaches 1767 N. The 20 mm piston rod carries an M16x1.5 male thread, and the adjustable air cushion is 21 mm long. The aluminium body measures 194 mm in length (A dimension), slightly longer than a fixed-stroke SC of the same bore to house the adjusting mechanism.
Airtac SCJ50 Standard Cylinder SCJ50X80-30S Technical Specifications
| Model | Airtac SCJ50 Standard Cylinder SCJ50X80-30S |
|---|---|
| Series | SCJ adjustable-stroke tie-rod cylinder |
| Bore size | Ø50 mm |
| Nominal stroke | 80 mm |
| Stroke adjustment | Up to 30 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 SCJ50X80-30S
| SCJ | Adjustable-stroke tie-rod cylinder series. |
|---|---|
| 50 | Bore size in mm. |
| ×80 | Nominal (maximum) stroke length in mm. |
| -30 | 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 SCJ50X80-30S Is Used
Commissioning & Setup
During machine build or line commissioning, technicians can back out the adjusting screw to fine-tune the actuator end position without re-plumbing or swapping cylinders, speeding up the debug phase.
Format Changeover
On packaging or assembly lines that run multiple product sizes, the 30 mm adjustment range allows operators to quickly reset a stop or pusher position between batches, reducing downtime.
Wear Compensation
In clamping or pressing fixtures where tooling surfaces gradually wear, the stroke-end screw can be advanced to maintain consistent contact force and part alignment over the tool's service life.
Is the Airtac SCJ50 Standard Cylinder SCJ50X80-30S the Right Cylinder?
Choose the SCJ50X80-30S when you need to dial in a precise stroke end without changing the cylinder or adding external hard stops. If the force is too low, stepping up to a 63 mm bore provides 1559 N push at 0.5 MPa; if it is too high, the 40 mm bore gives 628 N. For applications that do not require stroke adjustment, the fixed-stroke SC50 series is a simpler, lower-cost alternative. This model is a direct replacement for an existing AirTAC SCJ50X80-30S with PT ports, basic mounting, and a magnet-equipped barrel.
Adjustable-stroke checklist
- ✓ Need to fine-tune stroke on the line?
- ✓ Nominal stroke + adjust range (-30)
- ✓ 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 SCJ50X80-30S FAQ
At the standard 0.5 MPa operating pressure, 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 increases to 1767 N. The pull force is always lower because the piston rod reduces the effective area on the return stroke.
It can replace an SC50 if you need the stroke adjustment feature, but check the overall body length first. The SCJ50 body is 194 mm long (A dimension), which is longer than a standard SC50 of the same stroke. The mounting hole pattern and port size (PT1/4) are identical, but ensure you have clearance for the rear adjusting screw.
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