The AirTAC Airtac AIRTAC SCJ63 Standard Cylinder SCJ63X400-75 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, 400mm nominal stroke, PT1/4 ports and adjustable end cushioning.
The SCJ63X400-75 is a double-acting, single-rod pneumatic cylinder with a rear-cap adjusting screw that provides up to 75 mm of field-adjustable stroke reduction, letting you fine-tune the end position from 325 mm to the full 400 mm without swapping the unit. Its 63 mm bore and 20 mm piston rod deliver 1559 N of push force at 0.5 MPa, rising to 2805 N at the maximum operating pressure of 0.9 MPa, making it a robust actuator for mid-range industrial tasks.
This tie-rod cylinder uses a PT1/4 port and an M16x1.5 rod thread, with an integrated air cushion of 28 mm to decelerate the piston smoothly at stroke end. The SCJ body length (A dimension) is 197 mm, slightly longer than the fixed-stroke SC version to accommodate the rear adjuster. It operates on 40 µm filtered air from 0.15 to 1.0 MPa and is rated for speeds of 30-800 mm/s.
| Model | Airtac AIRTAC SCJ63 Standard Cylinder SCJ63X400-75 |
|---|---|
| Series | SCJ adjustable-stroke tie-rod cylinder |
| Bore size | Ø63 mm |
| Nominal stroke | 400 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. |
| ×400 | 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.
The 75 mm adjustment range allows technicians to precisely dial in the stroke end during machine commissioning, accommodating stack-up tolerances in tooling without needing to machine custom spacer blocks.
On a packaging line, the stroke can be quickly reset to handle different box sizes or pallet widths, minimizing downtime when switching between product runs.
In clamping or pressing applications, the rear adjuster can be periodically turned to take up mechanical wear on contact surfaces, maintaining consistent clamping force and cycle time without replacing parts.
For a 400 mm stroke, the 63 mm bore is a solid choice for moderate loads, but if your push force requirement is closer to 1000 N, stepping down to a 50 mm bore (982 N at 0.5 MPa) can reduce air consumption and physical size. Conversely, if you need over 2500 N regularly, the 80 mm bore (2513 N push at 0.5 MPa) provides a significant force increase. A fixed-stroke SC cylinder is a simpler, lower-cost alternative if you never need to change the stroke length after installation. At this 400 mm nominal stroke, be mindful of side loading and potential rod bending; if the load is not guided externally, consider adding a guide rod or switching to a guided cylinder to protect the rod and bearing. For a direct replacement, match the 63 mm bore, nominal 400 mm stroke, 75 mm adjust range, PT1/4 ports, and the specific SCJ mounting accessory if one is used.
Adjustable-stroke checklist
At the standard 0.5 MPa operating pressure, the push force is 1559 N. The pull force on the return stroke is 1402 N due to the area of the 20 mm rod. At the maximum operating pressure of 0.9 MPa, the push force reaches 2805 N.
A threaded screw in the rear cap acts as an internal, adjustable end-stop for the piston. By turning the screw, you can shorten the stroke end by up to 75 mm from the nominal 400 mm. This adjusts the physical stopping position and does not change the cylinder's bore, force output, or speed.
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