The AirTAC Airtac AIRTAC SCJ63 Standard Cylinder SCJ63X75-75STC 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, 75mm nominal stroke, PT1/4 ports and adjustable end cushioning.
The SCJ63X75-75STC is a double-acting, single-rod pneumatic cylinder with a 63 mm bore and a nominal 75 mm stroke, engineered for applications where the stroke end requires frequent, fine-tuned adjustment. Its defining feature is the rear-cap adjusting screw, which provides a full 75 mm of field-adjustable stroke reduction, allowing operators to dial in the exact end position without removing the cylinder or adding external hard stops. With a 20 mm piston rod and an M16x1.5 rod thread, it delivers a substantial 1559 N of push force at 0.5 MPa, making it a robust choice for medium-duty positioning tasks.
This model comes configured with a built-in magnet (-S) for direct mounting of CMSG/DMSG/EMSG sensors, enabling precise end-of-stroke or mid-stroke position sensing. The TC suffix denotes a centre trunnion mount, which is supplied with the TCM1 bracket (order code F-SC63TC), allowing the cylinder to pivot and accommodate angular misalignment in swinging loads. Operating on filtered air from 0.15 to 1.0 MPa, the SCJ63 series features a 28 mm air cushion to decelerate the piston smoothly, ensuring reliable performance in dynamic cycling applications.
| Model | Airtac AIRTAC SCJ63 Standard Cylinder SCJ63X75-75STC |
|---|---|
| Series | SCJ adjustable-stroke tie-rod cylinder |
| Bore size | Ø63 mm |
| Nominal stroke | 75 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. |
| ×75 | 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.
Ideal for packaging or assembly lines running different product sizes. The 75 mm adjustment screw lets operators quickly reset the stroke end for a new box height or component position during a format change, minimizing downtime.
During machine commissioning, the precise stroke end can be dialed in to match the tooling. Over time, the screw can be adjusted to compensate for mechanical wear in grippers or press tools, maintaining consistent part contact without reprogramming.
The centre trunnion (TC) mount allows the cylinder body to pivot, making it perfect for swinging clamp arms or levers. The adjustable stroke sets the final clamp angle, and the built-in magnet confirms the clamp has reached its fully open or closed position.
Select the SCJ63 when your application demands a push force of roughly 1560 N at standard factory air pressure, a level that comfortably handles medium clamping, pressing, or diverting tasks. If your force requirements are lower, stepping down to the 50 mm bore SCJ50 (982 N push at 0.5 MPa) can reduce air consumption and physical size. For higher force needs, the 80 mm bore SCJ80 provides a significant jump to 2513 N push at the same pressure. The 75 mm adjustable range on this model is particularly suited for processes with multiple product sizes or significant wear compensation.
For a fixed-stroke application where adjustability is not required, the standard SC63 cylinder is a more economical, direct alternative. As a direct replacement, match the 63 mm bore, 75 mm nominal stroke, and the full 75 mm adjust range, along with the PT port thread and the TC centre trunnion mounting. The built-in magnet is essential for sensor compatibility. For strokes of 300 mm or more, carefully evaluate side-loading on the 20 mm rod; an external guide rail or a switch to a guided cylinder is recommended to prevent rod bending and premature seal wear.
Adjustable-stroke checklist
The output force depends on the operating pressure. At 0.5 MPa, the push force is 1559 N and the pull force is 1402 N (lower due to the piston rod area). At the maximum operating pressure of 0.9 MPa, the push force increases to 2805 N. Always design your application around the available air pressure.
Yes, provided the bore (63 mm), maximum stroke (75 mm), and mounting style match. The SCJ63X75-75STC is a direct upgrade that adds stroke adjustability. You must ensure the longer body length A(SCJ) of 197 mm fits your machine and that you use the same PT port thread and TC centre trunnion mount with the TCM1 bracket.
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