The AirTAC Airtac SCJ40 Standard Cylinder SCJ40X750-50S 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, 750mm nominal stroke, PT1/4 ports and adjustable end cushioning.
The SCJ40X750-50S is a double-acting, single-rod pneumatic cylinder with a 40 mm bore and a nominal 750 mm stroke, equipped with a rear-cap adjusting screw that provides up to 50 mm of stroke-end reduction. This field-adjustable feature lets you fine-tune the piston stop position on the fly, making it invaluable for commissioning new machinery or adapting to different product formats without changing the cylinder. With a 16 mm diameter piston rod and PT1/4 ports, it delivers a push force of 628 N at 0.5 MPa, scaling to 1130 N at its maximum operating pressure of 0.9 MPa.
This model includes a built-in magnet, designated by the -S suffix, allowing for direct mounting of CMSG, DMSG, or EMSG reed and solid-state sensors along the tie-rod barrel for precise end-of-stroke detection. The cylinder body length A(SCJ) is 185 mm, and its pneumatic cushion is 21 mm long, providing reliable deceleration. As a genuine AirTAC component, it is designed for consistent performance and long service life in demanding industrial automation tasks.
| Model | Airtac SCJ40 Standard Cylinder SCJ40X750-50S |
|---|---|
| Series | SCJ adjustable-stroke tie-rod cylinder |
| Bore size | Ø40 mm |
| Nominal stroke | 750 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. |
| ×750 | 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.
The 50 mm adjustment range allows technicians to quickly fine-tune the end-stop position during initial machine setup and commissioning, eliminating the need to shim or reposition the entire cylinder.
On packaging or sorting lines, the stroke can be easily adjusted to handle different box sizes or product positions, reducing changeover time between batches without mechanical modifications.
In clamping or pressing operations, the adjustable stroke can be used to take up mechanical wear in tooling or workpieces over time, maintaining consistent contact and pressure without replacing components.
Choose the SCJ40X750-50S when your application requires a mid-range force output and the ability to precisely dial in the stroke end position over a 50 mm range. If you need more force, stepping up to the 50 mm bore SCJ series provides 982 N of push force at the same 0.5 MPa pressure. For applications where the stroke is fixed and never needs adjustment, the standard SC40X750 fixed-stroke cylinder is a more economical alternative. For a direct replacement, match the 40 mm bore, 750 mm nominal stroke, 50 mm adjust range, PT port thread, and the built-in magnet. Given the 750 mm stroke length, be mindful of potential rod bending under high side loads; using an external guide or switching to a guided cylinder is recommended for applications with significant lateral force.
Adjustable-stroke checklist
At 0.5 MPa, the push force is 628 N and the pull force is 528 N. The force increases with pressure, reaching a push force of 1130 N at the maximum operating pressure of 0.9 MPa. The pull force is always lower because the rod reduces the effective piston area on the return stroke.
Yes, the SCJ40X750-50S is mechanically identical to the non-magnet version. The built-in magnet simply adds the capability to use barrel-mounted sensors for position feedback. If you do not need sensors, it will function perfectly as a direct replacement.
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