The AirTAC Airtac SCJ40 Standard Cylinder SCJ40X180-75S 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. Ø40mm bore, 180mm nominal stroke, PT1/4 ports and adjustable end cushioning.
The SCJ40X180-75S is a double-acting, single-rod pneumatic cylinder with a field-adjustable stroke, giving you up to 75 mm of end-position fine-tuning via a rear-cap screw. With a 40 mm bore and 16 mm rod, it delivers 628 N of push force at 0.5 MPa, making it a practical workhorse for mid-range linear tasks where the final stop point needs to be dialed in precisely during setup or changeover.
The built-in magnet (denoted by the -S suffix) allows easy clamping of CMSG, DMSG, or EMSG reed and solid-state sensors directly onto the tie-rod barrel for end-of-stroke detection. This model uses the standard PT1/4 port, TPU seals for -20 to +70 °C operation, and comes in a basic mounting configuration, ready to accept the FA front flange or LB foot bracket from the SCJ accessory subset.
| Model | Airtac SCJ40 Standard Cylinder SCJ40X180-75S |
|---|---|
| Series | SCJ adjustable-stroke tie-rod cylinder |
| Bore size | Ø40 mm |
| Nominal stroke | 180 mm |
| Stroke adjustment | Up to 75 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. |
| ×180 | 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 commissioning, the 75 mm adjustment range allows engineers to quickly fine-tune the cylinder's end-stop position without machining spacers or moving hard stops, drastically reducing setup time.
On packaging lines, the adjustable stroke lets operators adapt the pusher or diverter stroke for different box or product sizes in minutes, simply by turning the rear screw, minimizing downtime between batches.
In clamping or pressing fixtures, the stroke can be incrementally extended over the cylinder's life to compensate for wear on tooling or contact surfaces, maintaining consistent clamping force and position.
Step up to a 50 mm bore (982 N push at 0.5 MPa) if your application demands more force, or down to 32 mm (402 N) for a lighter, more compact solution. If your stroke length is fixed and never requires field adjustment, the standard SC series offers the same mounting and force characteristics in a simpler, more economical package. For this SCJ40X180-75S, a direct replacement must match the 40 mm bore, 180 mm nominal stroke, 75 mm adjustable range, PT1/4 ports, and the -S magnet option.
At 180 mm of stroke, rod deflection under side loading is generally minimal, but for any off-axis force, pairing the cylinder with an external linear guide or switching to a guided cylinder is recommended to protect the rod bearing and seal from premature wear.
Adjustable-stroke checklist
At 0.5 MPa, this cylinder provides 628 N of push force and 528 N of pull force. The maximum push force at the 0.9 MPa operating limit is 1130 N. The pull force is lower because the 16 mm rod reduces the effective piston area on the return stroke.
The SCJ has a rear adjusting screw that lets you shorten the stroke end by up to 75 mm from its 180 mm nominal maximum. This is a mechanical stroke-end limiter, not a force or speed control. It's ideal for applications where the exact stop position needs to be tuned on the machine, unlike a fixed-stroke SC cylinder which requires external hard stops for any adjustment.
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