The AirTAC Airtac AIRTAC SCJ63 Standard Cylinder SCJ63X75-50TC is a genuine double-acting SINGLE-ROD air cylinder with a rear-cap ADJUSTING SCREW: the stroke end is field-adjustable within a 50 mm range without swapping the cylinder. Ø63mm bore, 75mm nominal stroke, PT1/4 ports and adjustable end cushioning.
The SCJ63X75-50 is a double-acting, single-rod pneumatic cylinder offering a 50 mm field-adjustable stroke end via a rear-cap screw. With a 63 mm bore, it delivers 1559 N of push force at 0.5 MPa, making it a capable mid-range actuator for tasks requiring fine mechanical end-stop tuning without swapping the cylinder.
This model features a 20 mm piston rod, PT1/4 ports, and an M16x1.5 rod thread. The adjustable range lets you shorten the nominal 75 mm stroke by up to 50 mm during commissioning or changeover. Its body length A(SCJ) is 197 mm, and it includes a 28 mm air cushion to decelerate the piston smoothly at stroke end.
| Model | Airtac AIRTAC SCJ63 Standard Cylinder SCJ63X75-50TC |
|---|---|
| Series | SCJ adjustable-stroke tie-rod cylinder |
| Bore size | Ø63 mm |
| Nominal stroke | 75 mm |
| Stroke adjustment | Up to 50 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. |
| ×75 | Nominal (maximum) stroke length in mm. |
| -50 | 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.
Perfect for setting precise mechanical stops during machine setup. The 50 mm adjustment screw allows operators to dial in the exact stroke end position without removing the cylinder from the machine.
Quickly adapt the cylinder stroke for different product sizes on packaging or sorting lines. The rear screw adjustment is faster than swapping cylinders, minimizing downtime between batches.
Compensate for wear in tooling or mating parts over time. The adjustable stroke end can be extended slightly to maintain consistent clamping or pressing force as components bed in.
Select the SCJ63X75-50 when you need to dial in a precise stroke end position on a machine. Its 50 mm adjustment range is ideal for format changes or wear take-up. If you require more force, step up to the 80 mm bore (2513 N push at 0.5 MPa); for a lighter, more compact solution, the 50 mm bore (982 N push) may suffice. The TC centre trunnion mount (F-SC63TC) allows the cylinder to pivot, accommodating angular movement in the application.
For a direct replacement, match the 63 mm bore, 75 mm nominal stroke, 50 mm adjust range, PT port thread, and TC mounting. If your stroke is fixed and never needs field adjustment, the standard SC63X75 is a simpler alternative. For strokes of 300 mm or more, evaluate side-loading on the rod and consider an external guide or a guided cylinder to prevent bending.
Adjustable-stroke checklist
At 0.5 MPa, the push force is 1559 N and the pull force is 1402 N. At the maximum operating pressure of 1.0 MPa, the theoretical push force is 3118 N. Because it is a single-rod cylinder, the pull force is lower due to the area of the 20 mm rod.
Yes, if your existing cylinder has a 63 mm bore, a 75 mm nominal stroke, a 50 mm adjustable range, PT ports, and a centre trunnion (TC) mount. The SCJ is a tie-rod cylinder, so verify body length and mounting dimensions against your current unit. This model does not include a magnet for sensors.
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