The AirTAC Airtac SCJ63 Standard Cylinder SCJ63X275-50 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, 275mm nominal stroke, PT1/4 ports and adjustable end cushioning.
The SCJ63X275-50 delivers a nominal 275 mm stroke with a 50 mm rear-end adjustment range, letting you dial in the exact stop position on the machine. At 0.5 MPa it produces 1559 N of push force and 1402 N on the pull stroke, driven by a 20 mm piston rod through PT1/4 ports. The body length A(SCJ) is 197 mm plus stroke, and the integrated air cushion provides a 28 mm deceleration zone at each end.
Because the stroke end is set by a rear-cap screw, you can compensate for tooling wear, accommodate different part batches, or fine-tune a pick-and-place depth without removing the cylinder or adding external hard stops. The unit runs on 40 µm filtered air from 0.15 to 1.0 MPa and suits speeds of 30–800 mm/s. For position sensing, add the -S magnet option and mount CMSG/DMSG sensors directly on the tie-rod barrel.
| Model | Airtac SCJ63 Standard Cylinder SCJ63X275-50 |
|---|---|
| Series | SCJ adjustable-stroke tie-rod cylinder |
| Bore size | Ø63 mm |
| Nominal stroke | 275 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. |
| ×275 | 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.
During line commissioning, the 50 mm adjustment range lets technicians fine-tune the actuator’s end stop without re-plumbing or swapping cylinders, speeding up the debug phase.
On packaging or assembly lines running multiple SKUs, operators can quickly dial in a new stroke end for different box heights or part thicknesses, reducing changeover downtime.
In pressing or clamping fixtures, the rear screw can be advanced periodically to compensate for pad or tooling wear, maintaining consistent contact force without mechanical shims.
Choose this 63 mm bore when the 50 mm bore’s 982 N push at 0.5 MPa is borderline and you need the next force step without jumping to the 80 mm frame. If your application requires a fixed, non-adjustable stroke, the standard SC63X275 is a simpler alternative. For guided loads or high side forces, pair the cylinder with an external linear guide or switch to a guided cylinder series.
At 275 mm of stroke, the rod is partially extended under load; ensure the side force is within the rod’s bending limit or add an external guide rail. The direct replacement is an AirTAC SCJ63X275-50 with PT ports and basic mounting. If you need a centre-pivot mount, order SCJ63X275-50TC (includes TCM1 trunnion bracket, code F-SC63TC).
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 0.9 MPa, push force reaches 2805 N. The theoretical force at 1.0 MPa is 318 kgf. Push force is always higher than pull because the single rod reduces the piston area on the return side.
Yes, provided the nominal stroke and port thread match. The SCJ63X275-50 has the same mounting envelope as the SC series but adds a rear adjusting screw that shortens the stroke end by up to 50 mm. Use the same mounting accessories from the SCJ subset (FA, LB, TC). Note that the body is slightly longer than the fixed-stroke SC to house the adjustment mechanism.
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