The AirTAC Airtac SCJ50 Standard Cylinder SCJ50X70-30 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, 70mm nominal stroke, PT1/4 ports and adjustable end cushioning.
The SCJ50X70-30 is a 50 mm bore, double-acting single-rod pneumatic cylinder with a 70 mm nominal stroke and a 30 mm rear adjusting screw. This design allows the stroke end position to be fine-tuned in the field, delivering 982 N of push force and 825 N of pull force at 0.5 MPa. The 20 mm diameter piston rod and PT1/4 port provide a robust connection for general industrial automation tasks.
With a body length A of 194 mm and an adjustable air cushion, this tie-rod cylinder is built for flexible integration. The 30 mm adjustment range is particularly useful for commissioning new equipment or accommodating wear in mechanical stops without swapping the cylinder. It is a genuine AirTAC component, ensuring consistent performance and part interchangeability.
| Model | Airtac SCJ50 Standard Cylinder SCJ50X70-30 |
|---|---|
| Series | SCJ adjustable-stroke tie-rod cylinder |
| Bore size | Ø50 mm |
| Nominal stroke | 70 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.
| 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.
| SCJ | Adjustable-stroke tie-rod cylinder series. |
|---|---|
| 50 | Bore size in mm. |
| ×70 | 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.
The 30 mm adjustment screw lets technicians dial in the exact stop position during machine setup, eliminating the need to fabricate shims or reposition external hard stops.
Ideal for packaging or assembly lines running multiple product sizes, where the stroke end must be quickly reset between batches without mechanical modifications.
In clamping or pressing fixtures, the adjustable stroke can be used to take up slack as tooling or contact surfaces wear over time, maintaining consistent clamping force and position.
Choose the SCJ50X70-30 when your application requires a 70 mm stroke that can be shortened by up to 30 mm for precise end-position tuning. If you need more force, stepping up to the 63 mm bore provides 1559 N of push force at 0.5 MPa. For applications where the stroke length is fixed and never needs field adjustment, the standard SC50 series offers a more economical solution. A direct replacement must match the 50 mm bore, 70 mm nominal stroke, 30 mm adjustment range, PT port thread, and basic mounting style.
Adjustable-stroke checklist
At 0.5 MPa, the cylinder provides 982 N of push force and 825 N of pull force. The maximum push force at the 0.9 MPa operating limit is 1767 N. The pull force is lower due to the area of the 20 mm piston rod.
A screw in the rear cap acts as an internal, adjustable end-stop for the piston. Turning the screw changes the retracted stroke end position within a 30 mm range, allowing the effective stroke to be set anywhere between 40 mm and the full 70 mm nominal stroke without changing the cylinder body.
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