The AirTAC Airtac SCJ63 Standard Cylinder SCJ63X275-75S 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, 275mm nominal stroke, PT1/4 ports and adjustable end cushioning.
The SCJ63X275-75S is a double-acting, single-rod pneumatic cylinder with a field-adjustable stroke, delivering 1559 N of push force at 0.5 MPa. Its rear-cap adjusting screw provides up to 75 mm of stroke-end reduction, allowing machine builders to fine-tune the piston stop position without swapping the cylinder or adding external hard stops. This model features a 20 mm diameter piston rod and PT1/4 ports.
Designed for flexible automation, this 63 mm bore tie-rod cylinder includes a built-in magnet, enabling direct mounting of CMSG/DMSG/EMSG reed or solid-state sensors along the barrel for reliable end-of-stroke detection. The adjustable pneumatic cushion decelerates the piston smoothly, and the standard TPU seals offer a reliable operating range from -20 to +70 °C.
| Model | Airtac SCJ63 Standard Cylinder SCJ63X275-75S |
|---|---|
| Series | SCJ adjustable-stroke tie-rod cylinder |
| Bore size | Ø63 mm |
| Nominal stroke | 275 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. |
| ×275 | 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.
Field technicians can dial in the exact stroke end position during initial machine setup, compensating for mechanical tolerances and ensuring perfect alignment with tooling or fixtures without needing multiple fixed-stroke cylinders.
On packaging or sorting lines, the 75 mm adjustment range allows rapid reconfiguration of a pusher or diverter arm's travel to handle different product sizes, minimizing downtime between production runs.
In high-cycle clamping or pressing operations, the adjustable stroke can be periodically extended to take up wear on contact surfaces or tooling, maintaining consistent process force and part quality over the machine's life.
Choose the SCJ63X275-75S when you need to commission or reconfigure a machine with a precise, adjustable end-stop within a 75 mm window. If your force requirements are lower, stepping down to a 50 mm bore reduces push force to 982 N at 0.5 MPa; for higher demands, an 80 mm bore provides 2513 N. For applications where the stroke is fixed and never needs adjustment, the standard SC63 fixed-stroke cylinder is a more economical choice. A direct replacement must match the 63 mm bore, 275 mm nominal stroke, 75 mm adjustable range, PT port thread, and the built-in magnet. At this 275 mm stroke length, ensure the rod is adequately supported against side loads, or consider an external guide rail to prevent bending and premature seal wear.
Adjustable-stroke checklist
This is a single-rod cylinder, so push and pull forces differ. At the standard 0.5 MPa operating pressure, 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 3118 N. The adjustable stroke screw does not alter the cylinder's force output.
You can replace a fixed-stroke SC63 or another SCJ63 with this unit, provided the mounting style matches. This SCJ63X275-75S has a basic mount and a built-in magnet. The 75 mm adjustment range gives you flexibility a fixed-stroke cylinder cannot, but ensure your machine's physical envelope can accommodate the slightly longer SCJ body length of 197 mm plus the stroke.
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