The AirTAC Airtac SCJ63 Standard Cylinder SCJ63X150-75S 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, 150mm nominal stroke, PT1/4 ports and adjustable end cushioning.
The SCJ63X150-75 is a double-acting, single-rod pneumatic cylinder with a field-adjustable stroke end, allowing operators to fine-tune the extension stop within a 75 mm range without removing the cylinder from the machine. With a 63 mm bore and 20 mm piston rod, it delivers 1559 N of push force at 0.5 MPa, scaling up to 2805 N at the maximum operating pressure of 0.9 MPa, making it a robust choice for mid-range industrial positioning tasks.
This model includes a built-in magnet, enabling direct mounting of CMSG, DMSG, or EMSG reed and solid-state sensors along the tie-rod barrel for reliable end-of-stroke detection. The cylinder features an adjustable air cushion (28 mm length) for smooth deceleration and uses PT1/4 ports with an M16x1.5 rod thread, fitting neatly into the SCJ family's standard mounting ecosystem.
| Model | Airtac SCJ63 Standard Cylinder SCJ63X150-75S |
|---|---|
| Series | SCJ adjustable-stroke tie-rod cylinder |
| Bore size | Ø63 mm |
| Nominal stroke | 150 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. |
| ×150 | 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.
In packaging lines handling different box sizes, the 75 mm adjustment lets operators quickly dial in the correct pusher stop position for each product run, eliminating the need for mechanical shims or multiple fixed-stroke cylinders.
For automated welding or assembly fixtures, the adjustable stroke end compensates for electrode tip wear or part tolerance variations over time, maintaining consistent clamp force without reprogramming the PLC.
During new machine commissioning, engineers can incrementally adjust the cylinder's stroke end through the full 75 mm range to find the optimal actuator position, then lock the screw setting for production, speeding up development time.
Choose the SCJ63 bore when the 40 mm bore's 628 N push force at 0.5 MPa is insufficient, but the larger 80 mm bore's 2513 N is more power than your application requires. The 75 mm adjustable stroke range is ideal for processes that need frequent end-position changes, such as format changeovers, without the complexity of external hard stops. If your stroke is fixed and never needs field adjustment, the standard SC63 fixed-stroke cylinder is a simpler, more cost-effective alternative.
For replacement, match this cylinder with another SCJ63 adjustable-stroke unit with a 150 mm nominal stroke and a 75 mm adjustment range, ensuring PT port threads and the -S magnet option are specified. At this 150 mm stroke, rod deflection is minimal, but if the load has a significant side component, consider pairing the cylinder with an external guide rail or switching to a guided cylinder series.
Adjustable-stroke checklist
At 0.7 MPa operating pressure, this 63 mm bore cylinder generates 2182 N of push force and 1402 N of pull force. The pull force is lower because the 20 mm piston rod reduces the effective piston area on the retract side. The 75 mm adjustment screw only changes the stroke end position and has no effect on the cylinder's output force.
Yes, the SCJ63X150-75 shares the same bore, rod diameter, port size (PT1/4), and basic mounting dimensions as the SC63 series. The SCJ body is slightly longer to house the rear adjusting screw. Ensure your mounting arrangement has clearance for the screw mechanism and that you order the -S magnet version if your existing setup uses barrel-mounted sensors.
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