Airtac SCJ50 Standard Cylinder SCJ50X350-40
The AirTAC Airtac SCJ50 Standard Cylinder SCJ50X350-40 is a genuine double-acting SINGLE-ROD air cylinder with a rear-cap ADJUSTING SCREW: the stroke end is field-adjustable within a 40 mm range without swapping the cylinder. Ø50mm bore, 350mm nominal stroke, PT1/4 ports and adjustable end cushioning.
- BoreØ50 mm
- Nominal stroke350 mm
- Stroke adjust-40 mm
- Port sizePT1/4
- Rod threadM16×1.5
- CushionAdjustable, 21 mm
About the Airtac SCJ50 Standard Cylinder SCJ50X350-40
The SCJ50X350-40 is a double-acting, single-rod pneumatic cylinder that puts 982 N of push force at 0.5 MPa into a 350 mm nominal stroke, with a rear-cap adjusting screw providing up to 40 mm of field-adjustable stroke-end reduction. Its 20 mm diameter piston rod and 21 mm air cushion help manage deceleration, while the PT1/4 port supplies the working air.
Because the stroke can be fine-tuned without removing the cylinder, commissioning and format changeovers become faster. The body length A(SCJ) is 194 mm plus stroke, making it a direct fit where a fixed-stroke SC is too rigid for the application.
Airtac SCJ50 Standard Cylinder SCJ50X350-40 Technical Specifications
| Model | Airtac SCJ50 Standard Cylinder SCJ50X350-40 |
|---|---|
| Series | SCJ adjustable-stroke tie-rod cylinder |
| Bore size | Ø50 mm |
| Nominal stroke | 350 mm |
| Stroke adjustment | Up to 40 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 SCJ50X350-40
| SCJ | Adjustable-stroke tie-rod cylinder series. |
|---|---|
| 50 | Bore size in mm. |
| ×350 | Nominal (maximum) stroke length in mm. |
| -40 | 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 SCJ50X350-40 Is Used
End-Stop Tuning on Packaging Lines
The 40 mm adjustment screw lets operators dial in the exact push stroke for different box sizes without stopping the line for a cylinder swap.
Wear Take-Up in Clamping
As clamp pads wear, the adjustable stroke end can be extended slightly to maintain full clamping force, avoiding unplanned downtime.
Commissioning Trials
During machine setup, engineers can start with the full 350 mm stroke and reduce it in 40 mm increments to find the optimal actuator travel.
Is the Airtac SCJ50 Standard Cylinder SCJ50X350-40 the Right Cylinder?
Choose this 50 mm bore when the 40 mm bore's 628 N push at 0.5 MPa is insufficient, but a 63 mm cylinder's 1559 N is more force than the structure needs. For applications that never require stroke adjustment, the standard SC fixed-stroke cylinder is a simpler, lower-cost alternative. A direct replacement must match the SCJ50 bore, 350 mm nominal stroke, 40 mm adjust range, PT thread, and basic mounting.
At 350 mm of stroke, side-loading can bend the 20 mm rod or wear the bearing. If the load is not guided externally, add a guide rail or switch to a guided cylinder to protect the rod and seals.
Adjustable-stroke checklist
- ✓ Need to fine-tune stroke on the line?
- ✓ Nominal stroke + adjust range (-40)
- ✓ 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 SCJ50X350-40 FAQ
At 0.5 MPa, push force is 982 N and pull force is 825 N. At the maximum operating pressure of 0.9 MPa, push force reaches 1767 N. The theoretical maximum at 1.0 MPa is 200 kgf.
Only if the extra body length for the adjusting screw is acceptable and you need the 40 mm adjustable range. The port, rod, and mounting footprints are otherwise identical to the SC series.
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