Airtac SCJ50 Standard Cylinder SCJ50X125-30STC
The AirTAC Airtac SCJ50 Standard Cylinder SCJ50X125-30STC is a genuine double-acting SINGLE-ROD air cylinder with a rear-cap ADJUSTING SCREW: the stroke end is field-adjustable within a 30 mm range without swapping the cylinder. Ø50mm bore, 125mm nominal stroke, PT1/4 ports and adjustable end cushioning.
- BoreØ50 mm
- Nominal stroke125 mm
- Stroke adjust-30 mm
- Port sizePT1/4
- Rod threadM16×1.5
- CushionAdjustable, 21 mm
About the Airtac SCJ50 Standard Cylinder SCJ50X125-30STC
The SCJ50X125-30STC is a 50 mm bore double-acting single-rod cylinder whose rear adjusting screw lets you fine-tune the stroke end by up to 30 mm, delivering 982 N of push force at 0.5 MPa. Its 20 mm diameter rod and PT1/4 ports handle mid-range clamping and positioning tasks where the final stop point must be dialled in during commissioning or after tooling wear.
This model comes with a built-in magnet (S) for CMSG/DMSG/EMSG barrel sensors and a centre trunnion mount (TC) with the TCM1 bracket (order code F-SC50TC), allowing the cylinder to pivot as it strokes. The body length A(SCJ) is 194 mm, and the adjustable air cushion decelerates the piston smoothly over the last 21 mm of travel.
Airtac SCJ50 Standard Cylinder SCJ50X125-30STC Technical Specifications
| Model | Airtac SCJ50 Standard Cylinder SCJ50X125-30STC |
|---|---|
| Series | SCJ adjustable-stroke tie-rod cylinder |
| Bore size | Ø50 mm |
| Nominal stroke | 125 mm |
| Stroke adjustment | Up to 30 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 SCJ50X125-30STC
| SCJ | Adjustable-stroke tie-rod cylinder series. |
|---|---|
| 50 | Bore size in mm. |
| ×125 | Nominal (maximum) stroke length in mm. |
| -30 | 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 SCJ50X125-30STC Is Used
Commissioning & Setup
Fine-tune the stroke end by up to 30 mm on a new machine without swapping cylinders or machining external hard stops, speeding up factory acceptance tests.
Format Changeover
Adjust the push-out position for different box or tray sizes on a packaging line; the trunnion mount lets the cylinder pivot freely as the conveyor width changes.
Wear Take-Up
Compensate for pad or gripper wear on a pick-and-place unit by advancing the stroke end 30 mm, maintaining consistent contact without reprogramming the PLC.
Is the Airtac SCJ50 Standard Cylinder SCJ50X125-30STC the Right Cylinder?
Choose this 50 mm bore when your application needs around 982 N of push force at standard plant pressure; stepping down to the 40 mm bore drops push to 628 N, while moving up to the 63 mm bore raises it to 1559 N. The 30 mm adjustable stroke is ideal for format changeovers on packaging lines or taking up tolerance stack on assembly fixtures. For a direct replacement, match the 50 mm bore, 125 mm nominal stroke, 30 mm adjust range, PT port thread, TC trunnion mounting, and magnet option.
Because the nominal stroke is 125 mm, rod buckling is not a primary concern at standard pressure, but if the load applies a significant side force, consider adding an external linear guide or switching to a guided cylinder. If you do not need the field-adjustable stroke end, the fixed-stroke SC50X125 is a simpler alternative.
Adjustable-stroke checklist
- ✓ Need to fine-tune stroke on the line?
- ✓ Nominal stroke + adjust range (-30)
- ✓ 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 SCJ50X125-30STC FAQ
At 0.5 MPa, it delivers 982 N pushing and 825 N pulling (the pull force is lower because of the 20 mm rod area). At the maximum operating pressure of 0.9 MPa, push force reaches 1767 N.
Yes, if your existing cylinder is an AirTAC SCJ50 with a 125 mm nominal stroke and 30 mm adjust range, this STC variant is a direct drop-in replacement that adds a magnet for sensors and a centre trunnion mount. Ensure your port thread is PT and the trunnion bracket F-SC50TC is installed.
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