The AirTAC Airtac AIRTAC SCJ63 Standard Cylinder SCJ63X500-75 is a genuine double-acting SINGLE-ROD air cylinder with a rear-cap ADJUSTING SCREW: the stroke end is field-adjustable within a 75 mm range without swapping the cylinder. Ø63mm bore, 500mm nominal stroke, PT1/4 ports and adjustable end cushioning.
The SCJ63X500-75 is a double-acting, single-rod pneumatic cylinder with a field-adjustable stroke end, offering up to 75 mm of rear-screw adjustment from its 500 mm nominal stroke. This 63 mm bore model delivers 1559 N of push force at 0.5 MPa and 2805 N at 0.9 MPa, making it a robust actuator for mid-range industrial tasks where the final stop position must be dialled in precisely during commissioning or changeover.
Its tie-rod construction houses a 20 mm diameter piston rod and PT1/4 ports, with a 28 mm air cushion to decelerate the piston smoothly. The body length A(SCJ) is 197 mm, and the adjustable screw shortens only the stroke end, leaving the bore's full push and pull force characteristics unchanged. This cylinder is not an ISO 15552 profile unit; it is a direct replacement for another AirTAC SCJ63 cylinder with matching nominal stroke, 75 mm adjust range, and PT thread.
| Model | Airtac AIRTAC SCJ63 Standard Cylinder SCJ63X500-75 |
|---|---|
| Series | SCJ adjustable-stroke tie-rod cylinder |
| Bore size | Ø63 mm |
| Nominal stroke | 500 mm |
| Stroke adjustment | Up to 75 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. |
| ×500 | Nominal (maximum) stroke length in mm. |
| -75 | 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.
The 75 mm rear-screw adjustment lets technicians dial in the exact stroke end position on a new machine without cutting brackets or repositioning limit switches, accelerating factory acceptance tests.
On packaging lines, operators can quickly adjust the cylinder's end stop to accommodate different box heights or pallet sizes, reducing downtime between production runs.
In long-running clamping or pressing fixtures, the adjustable stroke can be periodically extended to compensate for tooling wear or gasket compression, maintaining consistent contact force.
Choose the SCJ63X500-75 when you need to fine-tune a 500 mm stroke endpoint by up to 75 mm without adding external hard stops. If your force requirement grows, stepping up to an 80 mm bore provides 2513 N of push at 0.5 MPa; if space is tight and force can be lower, the 50 mm bore delivers 982 N. This model is a direct dimensional and functional replacement for any AirTAC SCJ63X500-75 with basic mounting and PT ports.
For a 500 mm stroke, consider the rod's unsupported length. If the load applies significant side force or the rod is not rigidly guided, an external guide rail or switching to a guided cylinder will prevent rod bending and premature seal wear. When the stroke length never needs field adjustment, the simpler fixed-stroke SC63X500 is a more economical alternative.
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 reaches 318 kgf. The adjustable stroke screw does not alter these force outputs.
It can replace another AirTAC SCJ63 cylinder with a 500 mm nominal stroke and 75 mm adjustment range. It is not a drop-in replacement for a fixed-stroke SC63, as the SCJ body is longer to house the adjusting mechanism. Always match bore, stroke, adjust range, port thread, and mounting style for a correct replacement.
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