The AirTAC Airtac SCJ63 Standard Cylinder SCJ63X25-30STC 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. Ø63mm bore, 25mm nominal stroke, PT1/4 ports and adjustable end cushioning.
The SCJ63X25-30STC is a double-acting, single-rod pneumatic cylinder with a rear adjusting screw that provides up to 30 mm of field-adjustable stroke-end reduction. This allows fine-tuning of the piston stop position without replacing the cylinder or adding external hard stops, ideal for commissioning and format changeovers. With a 63 mm bore and 20 mm rod, it delivers 1559 N of push force at 0.5 MPa, making it a capable workhorse for short-stroke positioning tasks.
This model includes a built-in magnet (-S) for direct mounting of CMSG/DMSG/EMSG sensors, and a centre trunnion (TC) mount with the TCM1 bracket for pivoting applications. The body length A(SCJ) is 197 mm, and it features a 28 mm air cushion for smooth deceleration. Operating pressure is 0.15-1.0 MPa with filtered air, and the standard PT port is 1/4 inch.
| Model | Airtac SCJ63 Standard Cylinder SCJ63X25-30STC |
|---|---|
| Series | SCJ adjustable-stroke tie-rod cylinder |
| Bore size | Ø63 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, 28 mm |
| Max stroke | Up to 1500 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 | 1559 N | 1402 N |
| 0.7 MPa | 2182 N | — |
| Max (@1.0 MPa) | 318 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. |
|---|---|
| 63 | 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.
Fine-tune the final position of a clamp or stop during machine setup by adjusting the rear screw, eliminating the need to shim or reposition the entire cylinder for a perfect 25 mm stroke fit.
Quickly adapt a diverter gate's throw distance for different package sizes on a conveyor line. The 30 mm adjustment range allows operators to dial in a new stroke end in seconds.
In a pressing or crimping operation, use the adjustable stroke to advance the end position over time, compensating for tooling wear and maintaining consistent final pressure without replacing the cylinder.
Choose the SCJ63 when you need a robust, field-tunable stroke in the 63 mm bore class. If 1559 N of push force at 0.5 MPa is insufficient, stepping up to an 80 mm bore provides 2513 N. For a simpler, fixed-stroke application without the need for adjustment, the standard SC63 is a more economical choice. This specific SCJ63X25-30STC is a direct replacement for an identical AirTAC model with a 63 mm bore, 25 mm nominal stroke, 30 mm adjust range, PT ports, centre trunnion mount (F-SC63TC), and a magnet sensor.
Adjustable-stroke checklist
At the standard 0.5 MPa operating pressure, it produces 1559 N of pushing force and 1402 N of pulling force. The maximum push force at 0.9 MPa is 2805 N. The pull force is lower due to the area of the 20 mm piston rod.
Yes, if you need the ability to fine-tune the stroke end. The SCJ63X25-30STC has the same 25 mm maximum stroke. The rear screw allows you to shorten this stroke by up to 30 mm. Ensure your mounting and port connections (PT 1/4) match, and note the SCJ body is slightly longer than a fixed-stroke SC.
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