The AirTAC Airtac SCJ40 Standard Cylinder SCJ40X500-20 is a genuine double-acting SINGLE-ROD air cylinder with a rear-cap ADJUSTING SCREW: the stroke end is field-adjustable within a 20 mm range without swapping the cylinder. Ø40mm bore, 500mm nominal stroke, PT1/4 ports and adjustable end cushioning.
The SCJ40X500-20 is a double-acting, single-rod pneumatic cylinder equipped with a rear-cap adjusting screw that provides up to 20 mm of field-adjustable stroke-end control. With a 40 mm bore and a 16 mm piston rod, it delivers 628 N of push force and 528 N of pull force at 0.5 MPa, making it a practical actuator for mid-range automation tasks where the final stop position must be dialed in precisely during commissioning or changeover.
This tie-rod cylinder features a PT1/4 port, an M12x1.25 rod thread, and a 21 mm air cushion to decelerate the piston smoothly. The body length A for this SCJ model is 185 mm, and the 500 mm nominal stroke is well within the 1200 mm maximum standard stroke for the 40 bore, ensuring a robust, off-the-shelf configuration for applications requiring a long reach with adjustable end-position tuning.
| Model | Airtac SCJ40 Standard Cylinder SCJ40X500-20 |
|---|---|
| Series | SCJ adjustable-stroke tie-rod cylinder |
| Bore size | Ø40 mm |
| Nominal stroke | 500 mm |
| Stroke adjustment | Up to 20 mm (rear adjusting screw) |
| Acting type | Double acting (single rod) |
| Port size | PT1/4 |
| Rod thread | M12×1.25 |
| 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, 21 mm |
| Max stroke | Up to 1200 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 | 628 N | 528 N |
| 0.7 MPa | 880 N | — |
| Max (@1.0 MPa) | 128 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. |
|---|---|
| 40 | Bore size in mm. |
| ×500 | Nominal (maximum) stroke length in mm. |
| -20 | 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 end-of-stroke position during machine commissioning to perfectly align a stop point with a downstream fixture, eliminating the need to shim or reposition the entire cylinder.
Quickly adjust the stroke end for a packaging machine pusher when switching between product sizes, reducing changeover time by simply turning the rear adjusting screw instead of swapping out the cylinder.
Compensate for mechanical wear in a clamping or pressing application over time. The 20 mm adjustment range allows operators to restore the precise clamping position without disassembling the tooling.
Choose the SCJ40X500-20 when you need a 500 mm stroke with the ability to fine-tune the stop point by up to 20 mm without replacing the cylinder or adding external hard stops. If 628 N of push force at 0.5 MPa is insufficient, stepping up to the 50 mm bore (SCJ50) provides 982 N of push force. For applications where the stroke length is fixed and will never need adjustment, the standard SC40X500 fixed-stroke cylinder is a more economical choice.
For this 500 mm stroke, be mindful of side-loading and potential rod bending. If the load is not guided externally, consider adding an external linear guide or switching to a guided cylinder to protect the rod and seals. This model is a direct replacement for an existing AirTAC SCJ40X500-20 with PT ports and basic mounting; ensure the replacement matches the same bore, nominal stroke, and 20 mm adjust range.
Adjustable-stroke checklist
At the standard operating pressure of 0.5 MPa, the push force is 628 N and the pull force is 528 N. The pull force is lower due to the area of the 16 mm piston rod. At the maximum operating pressure of 1.0 MPa, the theoretical push force is 128 kgf.
The rear adjusting screw limits the piston's stroke end mechanically, allowing you to shorten the effective stroke by up to 20 mm from the 500 mm nominal maximum. It does not lock or hold the piston in place; if air pressure is lost, the piston can drift. For position holding without air, an external rod lock or pilot-operated check valve is required.
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