The AirTAC Airtac SCJ63 Standard Cylinder SCJ63X275-30 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. Ø63mm bore, 275mm nominal stroke, PT1/4 ports and adjustable end cushioning.
The SCJ63X275-30 is a double-acting, single-rod pneumatic cylinder that puts a 30 mm adjustable stroke range at your fingertips via a rear-cap screw. With a 63 mm bore, it delivers 1559 N of push force at 0.5 MPa and 2805 N at 0.9 MPa, while the 20 mm rod and 28 mm air cushion handle deceleration smoothly. The body length A(SCJ) is 197 mm, making it a compact choice for mid-force linear tasks where the end position needs field tuning.
Because the adjusting screw shortens the stroke end by up to 30 mm, you can dial in the exact stopping point during commissioning, format changeovers, or after mechanical wear—without swapping the cylinder or adding external hard stops. The nominal 275 mm stroke is well within the 1500 mm maximum for this bore, and the PT1/4 ports with M16x1.5 rod thread keep integration straightforward with standard AirTAC fittings and rod-end accessories.
| Model | Airtac SCJ63 Standard Cylinder SCJ63X275-30 |
|---|---|
| Series | SCJ adjustable-stroke tie-rod cylinder |
| Bore size | Ø63 mm |
| Nominal stroke | 275 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. |
| ×275 | 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, the 30 mm rear screw lets technicians fine-tune the actuator's end stop in seconds, eliminating the need to shim or reposition the entire cylinder when the tooling position is slightly off.
On packaging or assembly lines that run multiple SKU sizes, operators can quickly adjust the stroke end to match a new product length, reducing downtime between batches without any disassembly.
In high-cycle clamping or pressing fixtures, the adjustable stroke takes up pad wear over time. A simple turn of the screw restores the original clamp gap, extending service intervals and maintaining consistent part quality.
Step up to an 80 mm bore if your application demands more than 1559 N push at 0.5 MPa—the SCJ80 provides 2513 N at the same pressure. If you need a fixed, non-adjustable stroke, the standard SC63 offers the same force and mounting footprint without the rear screw. For replacement, match this model exactly: an SCJ63 with a 275 mm nominal stroke, 30 mm adjust range, PT thread, and basic mount.
At 275 mm of stroke, rod deflection under side load becomes a consideration. If your tooling applies any radial force, add an external guide rail or switch to a guided cylinder to protect the rod bearing and piston seals from uneven wear.
Adjustable-stroke checklist
At 0.5 MPa, push force is 1559 N and pull force is 1402 N (the difference is due to the single 20 mm rod). At the maximum operating pressure of 0.9 MPa, push force reaches 2805 N. Always size for the pull force if the cylinder does work in both directions.
The rear-cap screw mechanically limits how far the piston can extend, shortening the stroke end by up to 30 mm from the 275 mm nominal maximum. It is not a locking device—when air pressure is removed or the valve centers, the piston can drift. For position holding without live air, you must add an external rod lock or pilot-operated check valve.
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