Airtac SCJ40 Standard Cylinder SCJ40X115-50
The AirTAC Airtac SCJ40 Standard Cylinder SCJ40X115-50 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, 115mm nominal stroke, PT1/4 ports and adjustable end cushioning.
- BoreØ40 mm
- Nominal stroke115 mm
- Stroke adjust-50 mm
- Port sizePT1/4
- Rod threadM12×1.25
- CushionAdjustable, 21 mm
About the Airtac SCJ40 Standard Cylinder SCJ40X115-50
The SCJ40X115-50 is a double-acting, single-rod pneumatic cylinder that puts fine stroke tuning directly on the machine. A rear-cap adjusting screw lets you shorten the stroke end by up to 50 mm without removing the cylinder, making it ideal for commissioning trials and format changeovers. The 40 mm bore delivers 628 N of push force at 0.5 MPa, while the 16 mm piston rod and 21 mm air cushion handle everyday industrial cycling.
This model carries a nominal 115 mm stroke and the full 50 mm adjustable range, giving you an effective stroke that can be dialled anywhere between 65 mm and 115 mm. The tie-rod body is 185 mm long (A dimension) and uses PT1/4 ports as standard. At the maximum operating pressure of 0.9 MPa, push thrust reaches 1130 N, providing a useful force margin for clamping and pressing tasks.
Airtac SCJ40 Standard Cylinder SCJ40X115-50 Technical Specifications
| Model | Airtac SCJ40 Standard Cylinder SCJ40X115-50 |
|---|---|
| Series | SCJ adjustable-stroke tie-rod cylinder |
| Bore size | Ø40 mm |
| Nominal stroke | 115 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 SCJ40X115-50
| SCJ | Adjustable-stroke tie-rod cylinder series. |
|---|---|
| 40 | Bore size in mm. |
| ×115 | 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 SCJ40X115-50 Is Used
Commissioning & Setup
Dial in the exact stroke end position during machine build without cutting guide rails or swapping hard stops. The 50 mm adjustment range lets commissioning engineers fine-tune the actuator throw on the fly.
Format Changeovers
Quickly adapt a packaging machine to a new box size. The rear screw adjusts the pusher stroke end in seconds, reducing downtime between product runs where a 65–115 mm throw is needed.
Wear Take-Up
Compensate for tooling or gripper pad wear over time. Instead of replacing the cylinder, the operator simply turns the adjusting screw to restore the precise end-stop position, extending the maintenance interval.
Is the Airtac SCJ40 Standard Cylinder SCJ40X115-50 the Right Cylinder?
Choose the SCJ40 when you need the 628 N push force of a 40 mm bore but also require on-the-fly stroke adjustment. If your load demands more force, step up to the 50 mm bore SCJ50 series, which provides 982 N push at 0.5 MPa. For applications where the stroke is permanently fixed, the standard SC40 cylinder is a simpler, cost-effective alternative. When replacing an existing SCJ40X115-50, match the bore, 115 mm nominal stroke, 50 mm adjust range, PT1/4 port thread, basic mounting, and the absence of a magnet to ensure drop-in interchangeability.
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 SCJ40X115-50 FAQ
Because it is a single-rod cylinder, push and pull forces differ. At 0.5 MPa, push force is 628 N and pull force is 528 N. At the maximum operating pressure of 0.9 MPa, push force reaches 1130 N. The rear adjusting screw changes only the stroke end position, not the force output.
Only if you need the adjustable stroke feature and the slightly longer body length is acceptable. The SCJ40X115-50 matches the bore and port size of an SC40, but the rear screw assembly adds length. For a direct fixed-stroke replacement, use the standard SC40 series with the same 115 mm stroke.
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