Airtac SCJ40 Standard Cylinder SCJ40X75-50
The AirTAC Airtac SCJ40 Standard Cylinder SCJ40X75-50 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, 75mm nominal stroke, PT1/4 ports and adjustable end cushioning.
- BoreØ40 mm
- Nominal stroke75 mm
- Stroke adjust-50 mm
- Port sizePT1/4
- Rod threadM12×1.25
- CushionAdjustable, 21 mm
About the Airtac SCJ40 Standard Cylinder SCJ40X75-50
The SCJ40X75-50 is a double-acting single-rod pneumatic cylinder featuring a rear-cap adjusting screw that provides up to 50 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 tasks where the stroke length must be fine-tuned during commissioning or changeover without swapping the cylinder.
This model has a nominal 75 mm stroke, PT1/4 ports, and a 21 mm air cushion for smooth deceleration. Its body length A is 185 mm, and it operates within a standard pressure range of 0.15-1.0 MPa. The tie-rod construction ensures durability, while the adjustable screw sets the precise stroke end position, not the force or speed.
Airtac SCJ40 Standard Cylinder SCJ40X75-50 Technical Specifications
| Model | Airtac SCJ40 Standard Cylinder SCJ40X75-50 |
|---|---|
| Series | SCJ adjustable-stroke tie-rod cylinder |
| Bore size | Ø40 mm |
| Nominal stroke | 75 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.
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 SCJ40X75-50
| SCJ | Adjustable-stroke tie-rod cylinder series. |
|---|---|
| 40 | Bore size in mm. |
| ×75 | 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.
Where the Airtac SCJ40 Standard Cylinder SCJ40X75-50 Is Used
Commissioning & Setup
Engineers can precisely dial in the stroke end position on a new machine during initial trials, accommodating minor assembly variations without needing to order a new cylinder with a slightly different fixed stroke.
Product Format Changeover
On a packaging line, the pusher stroke can be quickly shortened by up to 50 mm to handle a different box size, minimizing downtime between production runs.
Wear Compensation
The adjustable screw can be used to take up mechanical play or compensate for wear in tooling or gripper fingers over time, maintaining precise end-of-stroke positioning.
Is the Airtac SCJ40 Standard Cylinder SCJ40X75-50 the Right Cylinder?
Choose the SCJ40X75-50 when your application requires a stroke that can be shortened by up to 50 mm from its 75 mm nominal maximum, a common need for format changes or wear take-up. If you need more force, stepping up to a 50 mm bore provides 982 N of push at 0.5 MPa. For a fixed, non-adjustable stroke, the standard SC series is a simpler alternative. A direct replacement must match the 40 mm bore, 75 mm nominal stroke, 50 mm adjust range, PT1/4 ports, and basic mounting.
Adjustable-stroke checklist
- ✓ Need to fine-tune stroke on the line?
- ✓ Nominal stroke + adjust range (-50)
- ✓ 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 SCJ40X75-50 FAQ
At the standard 0.5 MPa operating pressure, the push force is 628 N and the pull force is 528 N. The push force is greater because the single rod reduces the piston area on the return side. The maximum push force at 0.9 MPa is 1130 N.
A screw mechanism in the rear cap lets you shorten the stroke end by up to 50 mm from the 75 mm nominal maximum. This adjustment is done manually on the cylinder itself and changes the physical stopping point of the piston, not the air pressure or speed. It is ideal for fine-tuning the actuator's reach.
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