The AirTAC Airtac SCJ50 Standard Cylinder SCJ50X25-30STC 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 SCJ50X25-30STC is a double-acting, single-rod tie-rod cylinder that puts fine stroke-end tuning directly in your hands. Its rear-cap adjusting screw provides a 30 mm adjustable range, letting you dial in the exact stop position for a 25 mm nominal stroke without swapping the cylinder or adding external hard stops. With a 50 mm bore, it delivers 982 N of push force at 0.5 MPa, making it a compact workhorse for precise short-stroke tasks.
This model comes factory-equipped with a built-in magnet (-S) for direct mounting of CMSG/DMSG/EMSG sensors, and a TC centre trunnion mount (supplied with the TCM1 bracket, order code F-SC50TC) for pivoting applications. The 20 mm piston rod, PT1/4 ports, and 21 mm air cushion ensure smooth, reliable deceleration. Body length A(SCJ) is 194 mm, providing a rigid, tie-rod construction that stands up to industrial cycling.
| Model | Airtac SCJ50 Standard Cylinder SCJ50X25-30STC |
|---|---|
| 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.
Field-adjust the 30 mm stroke-end range to perfectly align a stop position during initial machine build-out, eliminating the need to shim or swap cylinders.
The TC trunnion mount allows the cylinder to pivot, while the adjustable stroke fine-tunes the gate angle for reliable sorting of small components on a conveyor line.
With the built-in magnet and a CMSG sensor, you can confirm the clamp has reached its adjusted end position, ensuring consistent pressure on delicate assemblies.
Choose the SCJ50X25-30STC when you need a short, field-adjustable stroke with trunnion mounting and sensor feedback. If your force requirement is lower, stepping down to a 40 mm bore reduces push force to 628 N at 0.5 MPa; for more power, the 63 mm bore provides 1559 N. The SCJ is the right pick over a fixed-stroke SC when your machine needs fine end-position tuning for commissioning, format changes, or wear compensation. For direct replacement, match the 50 mm bore, 25 mm nominal stroke, 30 mm adjust range, PT port thread, TC mounting, and built-in magnet.
Adjustable-stroke checklist
At the standard 0.5 MPa operating pressure, it delivers 982 N of push force and 825 N of pull force. The maximum push force at 0.9 MPa is 1767 N. This difference is due to the single-rod design, where the rod occupies area on the pull side.
Yes, if you need adjustable stroke. The SCJ50X25-30STC matches the 50 mm bore and 25 mm nominal stroke of an SC50X25, but adds a 30 mm rear adjustment range. Ensure your mounting is compatible with the TC trunnion style and that you account for the slightly longer SCJ body length.
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