The AirTAC Airtac SCJ63 Standard Cylinder SCJ63X250-75 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, 250mm nominal stroke, PT1/4 ports and adjustable end cushioning.
The SCJ63X250-75 delivers a nominal 250 mm stroke with a 75 mm rear-end adjustment range, letting you dial in the exact stop position on the fly. At 0.5 MPa it pushes with 1559 N and pulls with 1402 N, thanks to its 20 mm single rod, and the 28 mm air cushion at each end protects the assembly during high-cycle work.
This double-acting, single-rod cylinder is built on a proven tie-rod platform with a PT1/4 port and M16×1.5 rod thread. The SCJ body length A is 197 mm, keeping the footprint compact while the rear screw handles stroke-end fine-tuning without swapping the unit or adding external hard stops.
| Model | Airtac SCJ63 Standard Cylinder SCJ63X250-75 |
|---|---|
| Series | SCJ adjustable-stroke tie-rod cylinder |
| Bore size | Ø63 mm |
| Nominal stroke | 250 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. |
| ×250 | 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.
During machine bring-up, the 75 mm rear screw lets technicians creep up on the perfect stroke end without re-plumbing or swapping cylinders, cutting hours off start-up time.
When a packaging line switches between box sizes, the operator adjusts the stroke end in seconds to match the new carton depth, keeping changeover under a minute.
As gripper pads or tooling tips wear down over thousands of cycles, the 75 mm adjustment range lets you recover the exact contact position without replacing the end effector.
Choose the SCJ63 when the 50 mm bore’s 982 N push at 0.5 MPa is borderline; stepping up to 63 mm gives you 1559 N without jumping to the 80 mm bore’s 2513 N. If you never need to tweak the stroke after installation, the fixed-stroke SC63 is a simpler, slightly shorter alternative. For a drop-in replacement, match the 63 mm bore, 250 mm nominal stroke, 75 mm adjust range, PT thread, and basic mounting—add the -S suffix if your original had a magnet.
At 250 mm stroke, side-loading can bend the 20 mm rod or wear the bearing. If your load isn’t guided, add an external linear rail or switch to a guided cylinder to protect the rod and seals.
Adjustable-stroke checklist
At 0.5 MPa it pushes with 1559 N and pulls with 1402 N. At the maximum operating pressure of 0.9 MPa, push force reaches 2805 N. The push force is always higher than pull because the single rod reduces the piston area on the return side.
Yes, if the original is an AirTAC SCJ63 with a 250 mm nominal stroke and 75 mm adjust range, PT ports, and basic mounting. If the old unit had a magnet for sensors, order SCJ63X250-75S instead. The mounting, port thread, and adjust range must all match for a true drop-in fit.
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