The AirTAC Airtac AIRTAC SCJ63 Standard Cylinder SCJ63X90-75 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, 90mm nominal stroke, PT1/4 ports and adjustable end cushioning.
The SCJ63X90-75 is a double-acting, single-rod pneumatic cylinder that puts stroke-end fine-tuning directly on the machine. A rear-cap adjusting screw lets you shorten the effective stroke by up to 75 mm from its 90 mm nominal maximum, eliminating the need for external hard stops during commissioning or format changes. The 20 mm piston rod and PT1/4 ports keep it compatible with common AirTAC flow controls and fittings.
At 0.5 MPa, this 63 mm bore cylinder delivers 1559 N of push force and 1402 N on the pull stroke, making it a solid mid-range actuator for clamping, pressing, and positioning tasks. The adjustable air cushion, with a 28 mm cushion length, decelerates the piston smoothly at both ends, and the tie-rod construction allows straightforward field maintenance.
| Model | Airtac AIRTAC SCJ63 Standard Cylinder SCJ63X90-75 |
|---|---|
| Series | SCJ adjustable-stroke tie-rod cylinder |
| Bore size | Ø63 mm |
| Nominal stroke | 90 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. |
| ×90 | 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.
Fine-tune the retract or extend end position by up to 75 mm during machine bring-up. The rear screw adjustment lets technicians dial in the exact stroke needed without fabricating custom hard stops, cutting weeks from project timelines.
In high-cycle clamping or pressing fixtures, use the adjusting screw to periodically advance the stroke end and compensate for pad or tooling wear. This maintains consistent clamp force without disassembling the tool or replacing the cylinder.
Quickly reset the cylinder stroke for different product sizes on a packaging or assembly line. The 75 mm adjustment range allows a single SCJ63X90 actuator to handle multiple SKUs, reducing changeover time and the inventory of dedicated stroke cylinders.
Step up to an 80 mm bore (2513 N push at 0.5 MPa) if your load consistently exceeds the SCJ63's mid-range force capability, or drop to a 50 mm bore (982 N push) for lighter, faster-cycling fixtures. Choose this SCJ adjustable-stroke model over a fixed-stroke SC when you need to dial in a precise end position on the machine without swapping cylinders—perfect for commissioning trials, wear take-up, or multi-product tooling. For direct replacement, match an AirTAC SCJ63 with a 90 mm nominal stroke, a -75 adjust range, PT ports, and the basic mounting configuration. If your application involves a stroke of 300 mm or more, evaluate side-loading on the 20 mm rod and consider an external guide rail or a guided cylinder to prevent rod bending.
Adjustable-stroke checklist
At the standard operating pressure of 0.5 MPa, this 63 mm bore cylinder generates 1559 N of push force and 1402 N of pull force. At the maximum operating pressure of 1.0 MPa, the theoretical push force is 318 kgf. The push force is higher than the pull force because the single piston rod reduces the effective area on the return stroke.
Yes, provided the mounting and porting match. The SCJ63X90-75 has the same envelope and tie-rod construction as a fixed-stroke SC63, with the addition of the rear adjusting screw. Ensure your machine layout has clearance for the slightly longer body length A(SCJ) of 197 mm and that the 75 mm adjustable range covers your stroke-end variation needs.
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