Airtac SCJ40 Standard Cylinder SCJ40X50-20STC
The AirTAC Airtac SCJ40 Standard Cylinder SCJ40X50-20STC is a genuine double-acting SINGLE-ROD air cylinder with a rear-cap ADJUSTING SCREW: the stroke end is field-adjustable within a 20 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-20 mm
- Port sizePT1/4
- Rod threadM12×1.25
- CushionAdjustable, 21 mm
About the Airtac SCJ40 Standard Cylinder SCJ40X50-20STC
The SCJ40X50-20STC is a double-acting, single-rod pneumatic cylinder that puts stroke-end fine-tuning directly on the machine. Its rear adjusting screw provides up to 20 mm of adjustment, letting you dial in the exact stop position for a 50 mm nominal stroke without swapping parts. With a 16 mm piston rod and PT1/4 ports, it delivers 628 N of push force at 0.5 MPa.
This model is factory-configured with a built-in magnet (-S) for direct mounting of CMSG/DMSG/EMSG sensors, and a centre trunnion (TC) mount that ships with the TCM1 bracket (order code F-SC40TC). The trunnion allows the cylinder to pivot, making it ideal for swinging or articulating loads. The adjustable air cushion decelerates the piston smoothly, and the body length A(SCJ) is 185 mm.
Airtac SCJ40 Standard Cylinder SCJ40X50-20STC Technical Specifications
| Model | Airtac SCJ40 Standard Cylinder SCJ40X50-20STC |
|---|---|
| Series | SCJ adjustable-stroke tie-rod cylinder |
| Bore size | Ø40 mm |
| Nominal stroke | 50 mm |
| Stroke adjustment | Up to 20 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 SCJ40X50-20STC
| SCJ | Adjustable-stroke tie-rod cylinder series. |
|---|---|
| 40 | Bore size in mm. |
| ×50 | Nominal (maximum) stroke length in mm. |
| -20 | 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 SCJ40X50-20STC Is Used
Commissioning & Setup
Fine-tune the end-of-stroke position during machine commissioning without changing hard stops or cylinder mounts, saving setup time.
Format Changeover
Quickly adjust the stroke for different product sizes on packaging or sorting lines by turning the rear screw, eliminating mechanical change parts.
Wear Compensation
Take up mechanical play in linkages or tooling over time by slightly extending the effective stroke, maintaining precise operation without a cylinder swap.
Is the Airtac SCJ40 Standard Cylinder SCJ40X50-20STC the Right Cylinder?
Choose the SCJ40 when your application needs up to 628 N of push force at standard plant air. If you require more force, stepping up to the SCJ50 provides 982 N of push at the same pressure. For applications where the stroke never needs field adjustment, the fixed-stroke SC40 is a simpler, cost-effective alternative. This SCJ40X50-20STC is a direct replacement for any AirTAC SCJ adjustable-stroke cylinder of the same 40 mm bore, 50 mm nominal stroke, 20 mm adjust range, PT ports, centre trunnion mounting, and magnetic piston.
Adjustable-stroke checklist
- ✓ Need to fine-tune stroke on the line?
- ✓ Nominal stroke + adjust range (-20)
- ✓ 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 SCJ40X50-20STC FAQ
At 0.5 MPa, the push force is 628 N and the pull force is 528 N. Because it is a single-rod cylinder, the push force is greater than the pull force due to the area of the 16 mm rod. The maximum operating push force at 0.9 MPa is 1130 N.
Yes, if you need field-adjustable stroke. The SCJ40X50-20STC shares the same bore, port size, and mounting interfaces as an SC40, but adds a rear adjusting screw for up to 20 mm of stroke-end adjustment. Ensure your mounting can accommodate the slightly longer SCJ body length of 185 mm.
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