The AirTAC Airtac SCJ50 Standard Cylinder SCJ50X25-30 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, 25mm nominal stroke, PT1/4 ports and adjustable end cushioning.
The SCJ50X25-30 is a double-acting, single-rod pneumatic cylinder that puts a 30 mm field-adjustable stroke range at your fingertips via a rear-cap screw. With a 50 mm bore and 20 mm rod, it delivers 982 N of push force at 0.5 MPa (1767 N at 0.9 MPa), giving you a compact yet powerful actuator for short-throw positioning tasks.
The body length A measures 194 mm, and the 21 mm air cushion decelerates the piston smoothly at each end. Because the stroke end is tunable within the 30 mm window, you can dial in the exact stop position during commissioning or format changes without adding external hard stops.
| Model | Airtac SCJ50 Standard Cylinder SCJ50X25-30 |
|---|---|
| Series | SCJ adjustable-stroke tie-rod cylinder |
| Bore size | Ø50 mm |
| Nominal stroke | 25 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. |
| ×25 | 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 bring-up, technicians can tweak the 30 mm rear screw to perfectly align the cylinder's end stop with mating tooling, eliminating the need to shim or re-drill mounting brackets.
Ideal for a clamping station where the jaw's closed position must be precisely set. The 982 N push force at0.5 MPa provides a firm grip, and the adjustable stroke compensates for part-thickness variations.
In a repetitive stop-pin application, the mechanical stop surface can wear over time. The 30 mm adjustment lets operators quickly recover the exact stopping position without replacing the cylinder or the hard stop.
Choose this 50 mm bore when your load needs roughly 982 N push at standard line pressure. If you require less force and a lighter body, step down to the 40 mm bore (628 N push at 0.5 MPa); for heavier loads, the 63 mm bore offers 1559 N. This is a basic-mount, PT-port, TPU-seal model without a magnet. For a direct replacement, match the bore, 25 mm nominal stroke, 30 mm adjust range, PT thread, and basic mounting. If your application demands guided motion or the 25 mm stroke is paired with a long tooling plate, consider an external guide rail to protect the rod from side loads.
Adjustable-stroke checklist
At 0.5 MPa, this single-rod cylinder generates 982 N of push force and 825 N of pull force. The difference is due to the 20 mm rod reducing the piston area on the return side. At the maximum operating pressure of 1.0 MPa, the theoretical push force is 1767 N.
Yes, if you need the 30 mm field-adjustable stroke feature. The SCJ50X25-30 shares the same bore, nominal stroke, port size (PT1/4), and mounting footprint as the basic SC50X25. Ensure your machine layout has clearance for the rear adjusting screw mechanism, which makes the SCJ body slightly longer.
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