Airtac SCJ50 Standard Cylinder SCJ50X50-40S
The AirTAC Airtac SCJ50 Standard Cylinder SCJ50X50-40S is a genuine double-acting SINGLE-ROD air cylinder with a rear-cap ADJUSTING SCREW: the stroke end is field-adjustable within a 40 mm range without swapping the cylinder. Ø50mm bore, 50mm nominal stroke, PT1/4 ports and adjustable end cushioning.
- BoreØ50 mm
- Nominal stroke50 mm
- Stroke adjust-40 mm
- Port sizePT1/4
- Rod threadM16×1.5
- CushionAdjustable, 21 mm
About the Airtac SCJ50 Standard Cylinder SCJ50X50-40S
The SCJ50X50-40S is a double-acting, single-rod pneumatic cylinder that delivers 982 N of push force at 0.5 MPa, making it a capable mid-range actuator for tasks that need a precise, field-tunable stroke end. Its rear adjusting screw provides a full 40 mm of adjustment range, allowing you to dial in the exact stop position during commissioning or changeover without swapping the cylinder or adding external hard stops.
This model includes a built-in magnet (-S suffix), so CMSG, DMSG, or EMSG sensors clamp directly onto the tie-rod barrel for reliable end-of-stroke sensing. The 50 mm bore uses a 20 mm diameter piston rod and PT1/4 ports, with a standard body length A(SCJ) of 194 mm. The adjustable air cushion decelerates the piston smoothly, and the entire unit is rated for a maximum operating pressure of 1.0 MPa, where it generates 1767 N of push force.
Airtac SCJ50 Standard Cylinder SCJ50X50-40S Technical Specifications
| Model | Airtac SCJ50 Standard Cylinder SCJ50X50-40S |
|---|---|
| Series | SCJ adjustable-stroke tie-rod cylinder |
| Bore size | Ø50 mm |
| Nominal stroke | 50 mm |
| Stroke adjustment | Up to 40 mm (rear adjusting screw) |
| Acting type | Double acting (single rod) |
| Port size | PT1/4 |
| Rod thread | M16×1.5 |
| 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 (Ø50mm)
| Pressure | Push force | Pull force |
|---|---|---|
| 0.5 MPa | 982 N | 825 N |
| 0.7 MPa | 1374 N | — |
| Max (@1.0 MPa) | 200 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 SCJ50 Standard Cylinder SCJ50X50-40S
| SCJ | Adjustable-stroke tie-rod cylinder series. |
|---|---|
| 50 | Bore size in mm. |
| ×50 | Nominal (maximum) stroke length in mm. |
| -40 | 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 SCJ50 Standard Cylinder SCJ50X50-40S Is Used
Commissioning & Setup
The 40 mm adjustment range lets technicians fine-tune the end-of-stroke position on a new machine without fabricating custom stops, speeding up initial setup and debugging.
Wear Take-Up in Clamping
In a clamping fixture, the adjustable screw compensates for part wear or tooling thickness variations over time, maintaining consistent clamping force without reprogramming.
Format Changeovers
On a packaging line, quickly adjust the stroke end to accommodate different box heights or product sizes by turning the rear screw, reducing downtime between production runs.
Is the Airtac SCJ50 Standard Cylinder SCJ50X50-40S the Right Cylinder?
Choose the SCJ50X50-40S when your application needs a 50 mm bore force class (982 N push at 0.5 MPa) and the ability to fine-tune the stroke end by up to 40 mm. If you need more force, stepping up to a 63 mm bore provides 1559 N of push at the same pressure. For a fixed, non-adjustable stroke, the standard SC series is a simpler, more economical choice. As a direct replacement, match the bore (50 mm), nominal stroke (50 mm), adjust range (-40), PT port thread, and the built-in magnet (-S). This SCJ model uses the basic mounting style, so it is ready for foot (LB) or front flange (FA) accessories if needed later.
Adjustable-stroke checklist
- ✓ Need to fine-tune stroke on the line?
- ✓ Nominal stroke + adjust range (-40)
- ✓ 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 SCJ50 Standard Cylinder SCJ50X50-40S FAQ
At the standard 0.5 MPa operating pressure, it generates 982 N of push force and 825 N of pull force. The push force is higher because the single piston rod reduces the effective area on the return stroke. At the maximum operating pressure of 1.0 MPa, the push force reaches 1767 N.
Yes, if you need the 40 mm adjustable stroke feature. The SCJ50X50-40S shares the same 50 mm bore, 50 mm nominal stroke, and PT1/4 port thread as a fixed-stroke SC50X50. Ensure your mounting style is compatible—this model has a basic mount, and you can add FA or LB accessories. The built-in magnet also allows you to add position sensors if your previous cylinder did not have them.
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