The AirTAC Airtac SCJ63 Standard Cylinder SCJ63X275-75 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, 275mm nominal stroke, PT1/4 ports and adjustable end cushioning.
The SCJ63X275-75 is a double-acting, single-rod pneumatic cylinder with a 63 mm bore and a nominal stroke of 275 mm, fitted with a rear-cap adjusting screw that provides up to 75 mm of stroke-end reduction. This allows machine builders to dial in the exact piston stop position on the fly without replacing the cylinder or adding external hard stops. With a 20 mm diameter piston rod and PT1/4 ports, it delivers a push force of 1559 N at 0.5 MPa and can reach 2805 N at the maximum operating pressure of 0.9 MPa.
At this stroke length, the cylinder body length A(SCJ) measures 197 mm, and the integral air cushion provides 28 mm of deceleration at each end to manage inertial loads. The adjustable screw only sets the retracted stroke end; it does not alter the cylinder's force output or speed capability, which remains 30-800 mm/s. For applications that may need to hold a load without live air pressure, an external pilot-operated check valve or rod lock must be added, as the cushion and screw do not provide any locking function.
| Model | Airtac SCJ63 Standard Cylinder SCJ63X275-75 |
|---|---|
| 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.
The 75 mm adjustment range lets technicians fine-tune the end stop during initial machine bring-up, compensating for stack-up tolerances in welded frames or tooling plates without re-machining mounts.
On packaging or assembly lines running multiple product sizes, operators can quickly dial in a new stroke end to match a different box height or component thickness, reducing changeover downtime.
In clamping or pressing fixtures, the screw can be advanced over time to take up mechanical wear on pads or linkages, maintaining consistent clamp force without replacing the cylinder.
Choose the SCJ63X275-75 when you need a mid-range force actuator whose stroke end can be fine-tuned during commissioning or format changes. If your load requires more force, stepping up to the 80 mm bore provides 2513 N of push at 0.5 MPa; for a lighter, more compact solution, the 50 mm bore delivers 982 N. The 275 mm stroke is within the standard range for this bore, but at this extension, ensure the rod is not subjected to high side loads—consider an external guide rail or switch to a guided cylinder if lateral forces are present.
For replacement, match an AirTAC SCJ cylinder with a 63 mm bore, 275 mm nominal stroke, and a 75 mm adjustment range (-75). This model uses the default PT port thread and basic mounting; if your application uses a magnet for sensors, order the -S variant. Should your process not require field adjustability, the fixed-stroke SC63X275 offers the same force and envelope without the rear screw mechanism.
Adjustable-stroke checklist
At 0.5 MPa, the push force is 1559 N and the pull force is 1402 N (the difference is due to the 20 mm rod area). At the maximum operating pressure of 0.9 MPa, push force reaches 2805 N. The theoretical maximum at 1.0 MPa is 318 kgf.
Yes, provided the nominal stroke and port size match. The SCJ body is slightly longer to house the rear adjusting screw, so verify the available space. The mounting footprint and rod thread (M16x1.5) are identical, and the same FA, LB, and TC mounting accessories fit both series.
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