Airtac SCJ50 Standard Cylinder SCJ50X70-40
The AirTAC Airtac SCJ50 Standard Cylinder SCJ50X70-40 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, 70mm nominal stroke, PT1/4 ports and adjustable end cushioning.
- BoreØ50 mm
- Nominal stroke70 mm
- Stroke adjust-40 mm
- Port sizePT1/4
- Rod threadM16×1.5
- CushionAdjustable, 21 mm
About the Airtac SCJ50 Standard Cylinder SCJ50X70-40
The SCJ50X70-40 is a 50 mm bore, double-acting, single-rod pneumatic cylinder with a rear adjusting screw that provides up to 40 mm of field-adjustable stroke reduction. This allows the effective stroke to be fine-tuned between 30 and 70 mm without changing the cylinder, delivering a push force of 982 N and a pull force of 825 N at 0.5 MPa.
Its 20 mm diameter piston rod and PT1/4 ports handle a maximum operating pressure of 1.0 MPa, where push thrust reaches 1767 N. The integrated air cushion is 21 mm long, and the body length A(SCJ) is 194 mm, making it a compact solution for applications needing on-machine stroke adjustment.
Airtac SCJ50 Standard Cylinder SCJ50X70-40 Technical Specifications
| Model | Airtac SCJ50 Standard Cylinder SCJ50X70-40 |
|---|---|
| Series | SCJ adjustable-stroke tie-rod cylinder |
| Bore size | Ø50 mm |
| Nominal stroke | 70 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 SCJ50X70-40
| SCJ | Adjustable-stroke tie-rod cylinder series. |
|---|---|
| 50 | Bore size in mm. |
| ×70 | 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 SCJ50X70-40 Is Used
Commissioning & Setup
Fine-tune the end position of a stopper or clamp during initial machine setup. The 40 mm adjustment range allows engineers to quickly compensate for assembly tolerances without swapping out the cylinder.
Wear Take-Up on Stops
On a packaging line, a product stop may wear over time. The rear adjusting screw can be turned to extend the stroke end slightly, maintaining precise product positioning without replacing the actuator.
Format Changeover
Quickly adapt a pusher's stroke for a different box size on a case packer. The operator adjusts the screw to the new required stroke length, reducing changeover time compared to a fixed-stroke cylinder.
Is the Airtac SCJ50 Standard Cylinder SCJ50X70-40 the Right Cylinder?
Choose the SCJ50X70-40 when you need to dial in a stroke end position during commissioning or format changes. If the 982 N push force at 0.5 MPa is insufficient, stepping up to the 63 mm bore provides 1559 N of push force. For applications where the stroke is fixed and never needs field adjustment, the standard SC50X70 fixed-stroke cylinder is a more economical choice.
A direct replacement must match the 50 mm bore, 70 mm nominal stroke, 40 mm adjust range, PT port thread, and basic mounting. For strokes of this length, side-loading is not a primary concern, but always ensure the load is guided if any lateral force is present to prevent premature rod bearing wear.
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 SCJ50X70-40 FAQ
At the standard operating pressure of 0.5 MPa, this 50 mm bore cylinder generates 982 N of push force and 825 N of pull force. The maximum push force at 1.0 MPa is 1767 N. The pull force is lower because the rod reduces the effective piston area on the return stroke.
Yes, if you need the ability to adjust the stroke end. The SCJ50X70-40 is a direct dimensional replacement for an SC50X70 where the extra body length for the adjusting screw is acceptable. Ensure the port thread (PT), mounting style, and the 40 mm adjustment range meet your application's requirements.
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