The AirTAC Airtac SCJ40 Standard Cylinder SCJ40X125-100S is a genuine double-acting SINGLE-ROD air cylinder with a rear-cap ADJUSTING SCREW: the stroke end is field-adjustable within a 100 mm range without swapping the cylinder. Ø40mm bore, 125mm nominal stroke, PT1/4 ports and adjustable end cushioning.
The SCJ40X125-100S is a double-acting, single-rod pneumatic cylinder with a 40 mm bore and a nominal 125 mm stroke, featuring a rear adjusting screw that provides a 100 mm field-adjustable range. This allows the effective stroke end to be precisely shortened without replacing the cylinder, ideal for commissioning and fine-tuning machine setups. The built-in magnet enables direct mounting of CMSG/DMSG/EMSG sensors for reliable end-of-stroke detection.
With a 16 mm diameter piston rod and PT1/4 ports, this model delivers 628 N of push force at 0.5 MPa and up to 1130 N at 0.9 MPa. The tie-rod construction includes an adjustable air cushion for smooth deceleration, and the body length A(SCJ) is 185 mm. It is a practical solution for applications requiring on-the-fly stroke adjustment within a compact, sensor-ready package.
| Model | Airtac SCJ40 Standard Cylinder SCJ40X125-100S |
|---|---|
| Series | SCJ adjustable-stroke tie-rod cylinder |
| Bore size | Ø40 mm |
| Nominal stroke | 125 mm |
| Stroke adjustment | Up to 100 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. |
| -100 | 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 100 mm adjustment range lets technicians dial in the exact stroke end position during initial machine commissioning, eliminating the need for multiple fixed-stroke cylinders.
Quickly adapt the cylinder's end stop for different product sizes on packaging or assembly lines, reducing downtime between production runs.
Adjust the stroke end to compensate for tooling wear or material thickness variations over time, maintaining consistent process quality without mechanical rework.
Choose the SCJ40X125-100S when you need to fine-tune the stroke end position by up to 100 mm during setup or format changes. If your force requirement is lower, the 32 mm bore SCJ series provides 402 N of push force at 0.5 MPa; for higher force, stepping up to the 50 mm bore delivers 982 N. This model is a direct replacement for an AirTAC SCJ adjustable-stroke cylinder of the same 40 mm bore, 125 mm nominal stroke, 100 mm adjust range, PT port thread, and built-in magnet.
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.
A rear-cap screw sets the physical stroke end position within a 100 mm range from the nominal 125 mm stroke. It is not a speed or force controller. For speed regulation, use external flow control valves.
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