The AirTAC Airtac SCJ40 Standard Cylinder SCJ40X300-20S 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, 300mm nominal stroke, PT1/4 ports and adjustable end cushioning.
The SCJ40X300-20S is a double-acting, single-rod pneumatic cylinder with a field-adjustable stroke end, providing a 20 mm fine-tuning range via the rear-cap screw. With a 40 mm bore and 16 mm rod, it delivers 628 N of push force and 528 N of pull force at 0.5 MPa, making it a solid mid-range actuator for commissioning adjustments or format changeovers.
This model includes a built-in magnet (-S suffix), allowing easy mounting of CMSG/DMSG/EMSG sensors directly onto the tie-rod barrel for reliable end-of-stroke detection. The PT1/4 port and M12x1.25 rod thread are standard, and the body length A(SCJ) is 185 mm, providing a compact yet robust solution for stroke-critical applications.
| Model | Airtac SCJ40 Standard Cylinder SCJ40X300-20S |
|---|---|
| Series | SCJ adjustable-stroke tie-rod cylinder |
| Bore size | Ø40 mm |
| Nominal stroke | 300 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. |
| ×300 | 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-stop position during machine commissioning to perfectly align with tooling or fixtures, eliminating the need for shims or custom spacers.
Quickly adjust the stroke for different product sizes on packaging or sorting lines, reducing downtime between batches with a simple screw adjustment.
Compensate for mechanical wear in grippers or linkages over time by incrementally adjusting the stroke end, maintaining consistent operation without immediate part replacement.
Choose the SCJ40X300-20S when your process needs a 300 mm nominal stroke with the ability to trim the end position by up to 20 mm without swapping the cylinder. If you require more push force, stepping up to the 50 mm bore SCJ50 delivers 982 N at 0.5 MPa. For applications where the stroke is permanently fixed, a standard SC40X300 cylinder is a simpler alternative. This is a direct replacement for any AirTAC SCJ40X300-20S with a PT port, basic mounting, and a magnet. For a 300 mm stroke, ensure the rod is not subjected to high side loads; if lateral forces are present, add an external linear guide or consider a guided cylinder.
Adjustable-stroke checklist
At the standard 0.5 MPa operating pressure, the push force is 628 N and the pull force is 528 N. The maximum push force at 0.9 MPa is 1130 N. The adjustable stroke screw does not alter the cylinder's force output.
A rear-cap screw sets the stroke end position within a 20 mm range, allowing you to fine-tune the stopping point in the field. Use the SCJ when you need to adjust the stroke for setup, different product runs, or wear take-up. Choose a fixed-stroke SC if your application has a single, unchanging end position.
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