Airtac SCJ50 Standard Cylinder SCJ50X40-20
The AirTAC Airtac SCJ50 Standard Cylinder SCJ50X40-20 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. Ø50mm bore, 40mm nominal stroke, PT1/4 ports and adjustable end cushioning.
- BoreØ50 mm
- Nominal stroke40 mm
- Stroke adjust-20 mm
- Port sizePT1/4
- Rod threadM16×1.5
- CushionAdjustable, 21 mm
About the Airtac SCJ50 Standard Cylinder SCJ50X40-20
The SCJ50X40-20 brings field-adjustable stroke control to a 50 mm bore double-acting cylinder, delivering 982 N of push force at 0.5 MPa (1767 N at 0.9 MPa). A rear-cap adjusting screw lets you shorten the stroke end by up to 20 mm without removing the cylinder, so you can dial in the exact stopping position during commissioning or after a format change.
This single-rod tie-rod cylinder uses a 20 mm diameter rod and PT1/4 ports, with a 21 mm air cushion at each end for smooth deceleration. The body length A(SCJ) is 194 mm, making it a direct fit where an adjustable end-stop is needed in a compact envelope.
Airtac SCJ50 Standard Cylinder SCJ50X40-20 Technical Specifications
| Model | Airtac SCJ50 Standard Cylinder SCJ50X40-20 |
|---|---|
| Series | SCJ adjustable-stroke tie-rod cylinder |
| Bore size | Ø50 mm |
| Nominal stroke | 40 mm |
| Stroke adjustment | Up to 20 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 SCJ50X40-20
| SCJ | Adjustable-stroke tie-rod cylinder series. |
|---|---|
| 50 | Bore size in mm. |
| ×40 | 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 SCJ50 Standard Cylinder SCJ50X40-20 Is Used
Commissioning Fine-Tuning
During machine setup, use the 20 mm adjusting screw to precisely set the end-stop for a 50 mm bore actuator without swapping shims or mechanical stops.
Format Changeover
On packaging lines, quickly adjust the push stroke for different box sizes by turning the rear screw, avoiding downtime for cylinder changes.
Wear Compensation
Take up mechanical play or seal wear in clamping fixtures by advancing the stroke end slightly, maintaining consistent clamp force over time.
Is the Airtac SCJ50 Standard Cylinder SCJ50X40-20 the Right Cylinder?
Choose the SCJ50X40-20 when you need to fine-tune the stroke end on a 50 mm bore platform. If 982 N push at 0.5 MPa is too light, step up to the 63 mm bore (1559 N push); if it is more force than necessary, the 40 mm bore provides 628 N. For applications that do not require stroke adjustment, the fixed-stroke SC50 series is a simpler alternative. This model replaces any AirTAC SCJ50 cylinder with a 40 mm nominal stroke, 20 mm adjust range, PT ports, and basic mounting.
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 SCJ50 Standard Cylinder SCJ50X40-20 FAQ
At 0.5 MPa, the push force is 982 N and the pull force is 825 N (the difference is due to the 20 mm single rod). At the maximum operating pressure of 0.9 MPa, push force reaches 1767 N.
Yes, if you need field-adjustable stroke end control within a 20 mm range. The SCJ50X40-20 shares the same 50 mm bore, PT1/4 ports, and mounting accessories (Basic, FA, LB, TC) as the SC50 series, but adds the rear adjusting screw.
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