Airtac SCJ40 Standard Cylinder SCJ40X125-10S
The AirTAC Airtac SCJ40 Standard Cylinder SCJ40X125-10S is a genuine double-acting SINGLE-ROD air cylinder with a rear-cap ADJUSTING SCREW: the stroke end is field-adjustable within a 10 mm range without swapping the cylinder. Ø40mm bore, 125mm nominal stroke, PT1/4 ports and adjustable end cushioning.
- BoreØ40 mm
- Nominal stroke125 mm
- Stroke adjust-10 mm
- Port sizePT1/4
- Rod threadM12×1.25
- CushionAdjustable, 21 mm
About the Airtac SCJ40 Standard Cylinder SCJ40X125-10S
The SCJ40X125-10S is a 40 mm bore double-acting single-rod cylinder with a field-adjustable stroke end, providing up to 10 mm of fine-tuning range from the rear cap. At 0.5 MPa, it delivers 628 N of push force and 528 N of pull force, making it a capable mid-range actuator for positioning tasks. The built-in magnet (suffix -S) allows direct mounting of CMSG/DMSG/EMSG sensors along the tie-rod barrel for reliable end-of-stroke detection.
This cylinder uses a 16 mm diameter piston rod with M12x1.25 male threads and PT1/4 ports. Its adjustable air cushion (21 mm length) decelerates the piston smoothly, while the rear screw sets the precise stroke end point without changing the nominal 125 mm maximum stroke. The body length A is 185 mm, slightly longer than the fixed-stroke SC version to house the adjustment mechanism.
Airtac SCJ40 Standard Cylinder SCJ40X125-10S Technical Specifications
| Model | Airtac SCJ40 Standard Cylinder SCJ40X125-10S |
|---|---|
| Series | SCJ adjustable-stroke tie-rod cylinder |
| Bore size | Ø40 mm |
| Nominal stroke | 125 mm |
| Stroke adjustment | Up to 10 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.
Theoretical Output Force (Ø40mm)
| 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.
Model Code: Airtac SCJ40 Standard Cylinder SCJ40X125-10S
| SCJ | Adjustable-stroke tie-rod cylinder series. |
|---|---|
| 40 | Bore size in mm. |
| ×125 | Nominal (maximum) stroke length in mm. |
| -10 | 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.
Where the Airtac SCJ40 Standard Cylinder SCJ40X125-10S Is Used
Commissioning Fine-Tuning
Technicians can adjust the rear screw to precisely set the end-stop for a 125 mm stroke actuator during machine setup, eliminating the need for external hard stops.
Wear Compensation
In clamping or pressing fixtures, the 10 mm adjustment range takes up pad or tooling wear over time, maintaining consistent contact force without reprogramming the machine.
Format Changeover
The adjustable stroke allows a quick mechanical change to the pusher's end position when switching product sizes on a packaging line, with sensor confirmation via the built-in magnet.
Is the Airtac SCJ40 Standard Cylinder SCJ40X125-10S the Right Cylinder?
Choose the SCJ40X125-10S when you need to dial in a stroke end position during commissioning or after tooling wear, without swapping the cylinder. If the 628 N push at 0.5 MPa is marginal, stepping up to the 50 mm bore SCJ50 delivers 982 N push. For applications that do not require stroke adjustment, the fixed-stroke SC40 is a simpler, cost-effective alternative. The direct replacement must match the 40 mm bore, 125 mm nominal stroke, 10 mm adjust range, PT ports, and the -S magnet option.
For this 125 mm stroke, side-loading is generally manageable, but ensure the load is guided if it is not purely axial. The basic mounting configuration allows you to add an FA front flange or LB foot bracket from the SCJ accessory set as needed.
Adjustable-stroke checklist
- ✓ Need to fine-tune stroke on the line?
- ✓ Nominal stroke + adjust range (-10)
- ✓ Required force at your working pressure
- ✓ Port/thread type (PT/NPT/G)
- ✓ Magnet (-S) for sensors?
Installation & Maintenance Notes
- check Use clean air filtered to 40µm or finer.
- check Keep within 0.15 – 1.0 MPa operating pressure.
- check Set the rear adjusting screw, then lock it before running.
- check Adjust end cushion screws for smooth stops.
- check Use SCJ mounting accessory (FA / LB / TC / TCM1).
- check Installation by qualified personnel per AirTAC docs.
Airtac SCJ40 Standard Cylinder SCJ40X125-10S FAQ
At the standard 0.5 MPa operating pressure, the cylinder provides 628 N of push force (full bore area) and 528 N of pull force (annular area minus the 16 mm rod). The maximum push force at 0.9 MPa is 1130 N.
A rear-cap screw sets the physical stroke end position within a 10 mm range, shortening the 125 mm nominal stroke. It is a mechanical end-stop, not a locking device. The piston will drift if air pressure is lost; use an external rod lock or pilot-operated check valve if position holding without pressure is required.
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