Airtac SCJ40 Standard Cylinder SCJ40X50-10
The AirTAC Airtac SCJ40 Standard Cylinder SCJ40X50-10 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, 50mm nominal stroke, PT1/4 ports and adjustable end cushioning.
- BoreØ40 mm
- Nominal stroke50 mm
- Stroke adjust-10 mm
- Port sizePT1/4
- Rod threadM12×1.25
- CushionAdjustable, 21 mm
About the Airtac SCJ40 Standard Cylinder SCJ40X50-10
The SCJ40X50-10 is a 40 mm bore double-acting, single-rod pneumatic cylinder with a field-adjustable stroke end, delivering 628 N of push force at 0.5 MPa. Its rear-cap adjusting screw provides a 10 mm range to fine-tune the stroke end position, making it ideal for commissioning, format changeovers, or taking up mechanical wear without replacing the cylinder.
This genuine AirTAC tie-rod cylinder uses a 16 mm diameter piston rod with an M12x1.25 rod thread and PT1/4 ports. The body length A(SCJ) is 185 mm, and it includes an adjustable air cushion for smooth deceleration. The standard TPU seal operates from -20 to +70 °C.
Airtac SCJ40 Standard Cylinder SCJ40X50-10 Technical Specifications
| Model | Airtac SCJ40 Standard Cylinder SCJ40X50-10 |
|---|---|
| Series | SCJ adjustable-stroke tie-rod cylinder |
| Bore size | Ø40 mm |
| Nominal stroke | 50 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 SCJ40X50-10
| SCJ | Adjustable-stroke tie-rod cylinder series. |
|---|---|
| 40 | Bore size in mm. |
| ×50 | 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 SCJ40X50-10 Is Used
Commissioning & Setup
Engineers can fine-tune the actuator's end position by up to 10 mm during initial machine setup, eliminating the need to shim or reposition the entire cylinder body.
Wear Take-Up on Stops
On packaging lines, the adjustable screw compensates for wear on mechanical stops or tooling, maintaining precise placement without downtime for cylinder replacement.
Format Changeovers
Quickly adjust the stroke end for different product sizes or formats in assembly fixtures, reducing changeover time compared to swapping fixed-stroke cylinders.
Is the Airtac SCJ40 Standard Cylinder SCJ40X50-10 the Right Cylinder?
Choose the SCJ40X50-10 when you need to dial in a precise end-stop on a 50 mm nominal stroke machine. If more force is required, stepping up to the 50 mm bore SCJ50 series provides 982 N of push force at the same 0.5 MPa pressure. For applications needing a lower force profile, the 32 mm bore SCJ32 series offers 402 N.
This model is a direct replacement for another AirTAC SCJ40X50-10 adjustable-stroke cylinder with PT ports and basic mounting. If your application does not require stroke adjustability, a fixed-stroke SC40X50 cylinder is a simpler, more cost-effective alternative. For strokes of 300 mm or more, evaluate side-loading on the 16 mm rod and consider an external guide or a guided cylinder to prevent rod bending.
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 SCJ40X50-10 FAQ
At an operating pressure of 0.5 MPa, this 40 mm bore cylinder produces 628 N of push force and 528 N of pull force. The push force is higher because the single rod reduces the effective piston area on the return stroke. The maximum push force at 0.9 MPa is 1130 N.
No, the SCJ is not a direct drop-in for a fixed-stroke SC. The SCJ body is slightly longer to house the adjusting screw mechanism. You must replace an SCJ with another SCJ of the same bore, nominal stroke, and adjust range. Confirm that the 10 mm adjustment range is sufficient for your process before ordering.
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