Airtac SCJ40 Standard Cylinder SCJ40X50-50
The AirTAC Airtac SCJ40 Standard Cylinder SCJ40X50-50 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, 50mm nominal stroke, PT1/4 ports and adjustable end cushioning.
- BoreØ40 mm
- Nominal stroke50 mm
- Stroke adjust-50 mm
- Port sizePT1/4
- Rod threadM12×1.25
- CushionAdjustable, 21 mm
About the Airtac SCJ40 Standard Cylinder SCJ40X50-50
The SCJ40X50-50 is a double-acting, single-rod pneumatic cylinder with a 40 mm bore and a nominal 50 mm stroke, featuring a rear-cap adjusting screw that provides a full 50 mm of stroke-end adjustability. This allows machine builders to precisely dial in the piston's stop position without changing the cylinder or adding external hard stops, making it ideal for commissioning and format changeovers. At 0.5 MPa, it delivers 628 N of push force and 528 N of pull force, with a 16 mm diameter piston rod and PT1/4 ports.
Built on the robust AirTAC tie-rod platform, this cylinder includes an adjustable air cushion for smooth deceleration and operates reliably between -20 and +70 °C with its standard TPU seals. The body length A(SCJ) is 185 mm, providing a compact yet powerful solution for applications where the final stroke length needs to be dialed in on the machine.
Airtac SCJ40 Standard Cylinder SCJ40X50-50 Technical Specifications
| Model | Airtac SCJ40 Standard Cylinder SCJ40X50-50 |
|---|---|
| Series | SCJ adjustable-stroke tie-rod cylinder |
| Bore size | Ø40 mm |
| Nominal stroke | 50 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 SCJ40X50-50
| SCJ | Adjustable-stroke tie-rod cylinder series. |
|---|---|
| 40 | Bore size in mm. |
| ×50 | 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 SCJ40X50-50 Is Used
Commissioning & Setup
The 50 mm adjustment range lets technicians quickly fine-tune the end-of-stroke position during initial machine commissioning without swapping cylinders or fabricating custom stops.
Wear Take-Up
In clamping or pressing fixtures, the adjustable stroke can be incrementally extended to compensate for tooling or pad wear, maintaining consistent clamping force without mechanical shimming.
Product Format Changeover
For packaging or sorting lines handling different product sizes, the stroke can be quickly adjusted to match a new box or part dimension, minimizing changeover downtime.
Is the Airtac SCJ40 Standard Cylinder SCJ40X50-50 the Right Cylinder?
Select the SCJ40X50-50 when you need to fine-tune the stroke end position within a 50 mm window during setup or for different product runs. If your force requirement is lower, stepping down to a 32 mm bore reduces push force to 402 N at 0.5 MPa; for more power, a 50 mm bore provides 982 N. This adjustable-stroke model is the right choice over a fixed-stroke SC cylinder when the exact stroke length is unknown at the design stage or may need periodic adjustment. For a direct replacement, match the 40 mm bore, 50 mm nominal stroke, 50 mm adjust range, PT port thread, and basic mounting. If this cylinder is used with a stroke of 300 mm or more, consider an external guide to prevent rod bending under side loads.
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 SCJ40X50-50 FAQ
At the standard operating pressure of 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 piston rod reduces the effective area on the return stroke.
A screw in the rear cap acts as an internal, adjustable end-stop for the piston. Turning the screw changes the stroke end position by up to 50 mm, shortening the nominal 50 mm stroke as needed. It sets the stopping point but does not lock or hold the load; the piston will drift if air pressure is lost.
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