The AirTAC Airtac SCJ40 Standard Cylinder SCJ40X125-75S 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, 125mm nominal stroke, PT1/4 ports and adjustable end cushioning.
The SCJ40X125-75S is a double-acting, single-rod pneumatic cylinder with a rear adjusting screw that provides up to 75 mm of field-adjustable stroke-end reduction. With a 40 mm bore and 16 mm rod, it delivers 628 N of push force at 0.5 MPa, making it a versatile actuator for applications requiring precise end-position tuning without cylinder replacement.
This model includes a built-in magnet (-S suffix), allowing direct mounting of CMSG/DMSG/EMSG reed or solid-state sensors along the barrel for reliable end-of-stroke detection. The cylinder body length A is 185 mm, and it features an adjustable air cushion of 21 mm for smooth deceleration. Operating on filtered air from 0.15 to 1.0 MPa, it is suited for dynamic adjustment during commissioning or format changeovers.
| Model | Airtac SCJ40 Standard Cylinder SCJ40X125-75S |
|---|---|
| Series | SCJ adjustable-stroke tie-rod cylinder |
| Bore size | Ø40 mm |
| Nominal stroke | 125 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. |
| ×125 | 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.
The 75 mm adjustment range allows engineers to dial in the exact stroke end position on a new machine without fabricating custom stops, speeding up initial commissioning and troubleshooting.
On packaging or sorting lines, the stroke can be quickly adjusted to handle different product sizes or box dimensions, minimizing downtime between production runs with a simple screw adjustment.
In clamping or pressing fixtures, the adjustable stroke can be extended slightly over time to compensate for mechanical wear on tooling or contact surfaces, maintaining consistent clamping force.
Choose the SCJ40X125-75S when you need to fine-tune the stroke end position within a 75 mm window on a 125 mm nominal stroke. If your force requirement is lower, the 32 mm bore SCJ series provides 402 N of push at 0.5 MPa; for a step up, the 50 mm bore delivers 982 N. This adjustable-stroke model is ideal for iterative setup, but if the stroke is permanently fixed after commissioning, a standard SC fixed-stroke cylinder is a more economical choice.
For direct replacement, match the 40 mm bore, 125 mm nominal stroke, 75 mm adjust range, PT port thread, and the built-in magnet option. The cylinder uses the basic mounting configuration, so no additional mounting brackets are included. For strokes of this length, ensure the rod is not subjected to high side loads; if lateral forces are present, consider an external guide rail or a guided cylinder.
Adjustable-stroke checklist
At 0.5 MPa, the push force is 628 N and the pull force is 528 N. The maximum push force at the 0.9 MPa operating limit is 1130 N. The pull force is lower because the rod reduces the effective piston area on the return stroke.
Yes, this is a direct replacement for any AirTAC SCJ40 cylinder with a 125 mm nominal stroke and a 75 mm adjustment range. Ensure your existing setup uses a PT port thread and requires the built-in magnet for sensors. The mounting is the basic body style, so no additional brackets are needed to match.
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