The AirTAC Airtac SCJ50 Standard Cylinder SCJ50X300-30S 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, 300mm nominal stroke, PT1/4 ports and adjustable end cushioning.
The SCJ50X300-30 is a double-acting, single-rod pneumatic cylinder that delivers 982 N of push force at 0.5 MPa, making it a robust choice for medium-duty automation tasks. Its defining feature is a rear-cap adjusting screw that provides up to 30 mm of field-adjustable stroke-end reduction, allowing you to fine-tune the piston stop position without removing the cylinder from the machine.
This model includes a built-in magnet (-S suffix) for direct mounting of CMSG/DMSG/EMSG sensors, enabling precise, non-contact end-of-stroke detection. With a 20 mm diameter piston rod, PT1/4 ports, and a 21 mm air cushion, it offers smooth deceleration. The body length for this adjustable-stroke version is 194 mm, slightly longer than a fixed-stroke SC of the same bore.
| Model | Airtac SCJ50 Standard Cylinder SCJ50X300-30S |
|---|---|
| Series | SCJ adjustable-stroke tie-rod cylinder |
| Bore size | Ø50 mm |
| Nominal stroke | 300 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. |
| ×300 | 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.
During machine commissioning, the 30 mm adjustment screw lets technicians dial in the exact stroke end position for a pick-and-place arm, compensating for minor fixture variations without needing to swap out the cylinder.
On a packaging line that handles different box sizes, the adjustable stroke allows operators to quickly reset the pusher stroke end from 300 mm down to 270 mm, accommodating a new product format in minutes.
In a clamping or pressing operation, the stroke can be incrementally extended over time to compensate for wear on a contact pad or tooling tip, maintaining consistent clamping force without reprogramming the PLC.
For applications needing a push force in the 982 N class at 0.5 MPa, the 50 mm bore is a balanced choice. If your load requires more force, stepping up to the 63 mm bore provides 1559 N of push force, while a step down to the 40 mm bore offers 628 N. This SCJ adjustable-stroke model is ideal when you need to fine-tune the stroke end during commissioning or changeovers; if the stroke length is fixed and never changes, a standard SC cylinder is a more economical alternative.
For this 300 mm stroke length, be mindful of side-loading on the 20 mm rod. If the load is not guided externally, rod deflection can cause premature seal wear and binding. In such cases, consider adding an external guide rail or switching to a guided cylinder assembly. A direct replacement must match the 50 mm bore, 300 mm nominal stroke, 30 mm adjust range, PT port thread, and the -S magnet option.
Adjustable-stroke checklist
At the standard operating pressure of 0.5 MPa, this cylinder provides a push force of 982 N. The pull force on the retract stroke is 825 N due to the area of the 20 mm piston rod. At the maximum operating pressure of 1.0 MPa, the theoretical push force is 1964 N.
A rear-cap screw mechanically limits the piston's forward stroke end by up to 30 mm. It is a physical stop for the stroke, not a force or speed adjuster. The cylinder will not hold its position if air pressure is lost; an external rod lock or pilot-operated check valve is required for load holding.
Genuine AirTAC parts produced by AirTAC factory.
Covers non-human-caused product damage.
Standard models usually ship in 3-4 days.
Most inquiries answered within 7-8 hours.
Send us the quantity and destination. We confirm price, stock and lead time — usually within 7-8 hours.