The AirTAC Airtac SCJ40 Standard Cylinder SCJ40X115-50S is a genuine double-acting SINGLE-ROD air cylinder with a rear-cap ADJUSTING SCREW: the stroke end is field-adjustable within a 50 mm range without swapping the cylinder. Ø40mm bore, 115mm nominal stroke, PT1/4 ports and adjustable end cushioning.
The AirTAC SCJ40X115-50S is a tie-rod, double-acting, single-rod cylinder that puts stroke-end tuning directly on the machine. Its rear-cap adjusting screw provides a 50 mm adjustment range, letting you dial in the exact 115 mm nominal stroke without swapping the cylinder or adding external hard stops. The 40 mm bore delivers 628 N of push force at 0.5 MPa, making it a solid performer for medium-duty positioning and clamping tasks.
This model is factory-equipped with a built-in magnet (suffix -S), so CMSG/DMSG/EMSG reed or solid-state sensors clamp directly onto the barrel for reliable end-of-stroke sensing. The 16 mm piston rod, PT1/4 port, and 21 mm air cushion work together to provide smooth deceleration. The body length A(SCJ) is 185 mm, and the standard TPU seal keeps the unit running reliably from -20 to +70 °C.
| Model | Airtac SCJ40 Standard Cylinder SCJ40X115-50S |
|---|---|
| Series | SCJ adjustable-stroke tie-rod cylinder |
| Bore size | Ø40 mm |
| Nominal stroke | 115 mm |
| Stroke adjustment | Up to 50 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. |
| ×115 | Nominal (maximum) stroke length in mm. |
| -50 | 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.
Technicians use the 50 mm adjusting screw to precisely set the retract or extend stop during initial machine build-out, eliminating the need to cut and try multiple fixed-stroke cylinders.
On a packaging line, the adjustable stroke allows a quick end-stop change for a new box size. The 628 N push force at 0.5 MPa handles medium-weight product guides and pusher arms.
In clamping fixtures, the stroke can be slightly extended over time to compensate for pad wear, maintaining consistent clamping force without replacing the entire actuator.
Choose the SCJ40X115-50S when you need to fine-tune a 115 mm stroke on the fly during commissioning or changeovers. If your force requirement grows, stepping up to the 50 mm bore (SCJ50) provides 982 N of push force at the same 0.5 MPa pressure. For a fixed, non-adjustable stroke, the standard SC series offers a simpler, more compact body. This cylinder is a direct replacement for another AirTAC SCJ40 with a 115 mm nominal stroke, 50 mm adjust range, PT port, and built-in magnet. Since the stroke is under 300 mm, rod bending under axial load is typically not a concern, but always align the load to avoid side forces.
Adjustable-stroke checklist
At the standard 0.5 MPa operating pressure, this 40 mm bore cylinder generates 628 N of push force and 528 N of pull force (the difference is due to the single rod). The maximum push force at 0.9 MPa is 1130 N.
The rear-cap screw sets the physical stroke-end position within a 50 mm range. It is not a speed or force adjuster. You set the maximum travel distance; the cylinder's speed is controlled separately by flow controls in the air line.
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