Airtac SCJ50 Standard Cylinder SCJ50X125-75
The AirTAC Airtac SCJ50 Standard Cylinder SCJ50X125-75 is a genuine double-acting SINGLE-ROD air cylinder with a rear-cap ADJUSTING SCREW: the stroke end is field-adjustable within a 75 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-75 mm
- Port sizePT1/4
- Rod threadM16×1.5
- CushionAdjustable, 21 mm
About the Airtac SCJ50 Standard Cylinder SCJ50X125-75
The SCJ50X125-75 brings field-adjustable stroke control to a 50 mm bore tie-rod cylinder, delivering 982 N of push force at 0.5 MPa and up to 1767 N at 0.9 MPa. Its rear-cap adjusting screw provides a generous 75 mm of stroke-end reduction, letting you dial in the exact stop position for commissioning, format changes, or wear compensation without changing the cylinder.
This double-acting, single-rod unit uses a 20 mm diameter piston rod and PT1/4 ports, with an adjustable air cushion that decelerates the load over the last 21 mm of travel. The body length A(SCJ) is 194 mm, making it a compact solution for machines where the stroke must be tuned precisely on-site. The 125 mm nominal stroke is well within the 1200 mm maximum standard stroke for this bore.
Airtac SCJ50 Standard Cylinder SCJ50X125-75 Technical Specifications
| Model | Airtac SCJ50 Standard Cylinder SCJ50X125-75 |
|---|---|
| Series | SCJ adjustable-stroke tie-rod cylinder |
| Bore size | Ø50 mm |
| Nominal stroke | 125 mm |
| Stroke adjustment | Up to 75 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 SCJ50X125-75
| SCJ | Adjustable-stroke tie-rod cylinder series. |
|---|---|
| 50 | Bore size in mm. |
| ×125 | Nominal (maximum) stroke length in mm. |
| -75 | 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 SCJ50X125-75 Is Used
Commissioning & Setup
During machine commissioning, the 75 mm adjustment range allows technicians to fine-tune the end-stop position without swapping cylinders or machining external stops, speeding up line start-up.
Product Changeover
On packaging or assembly lines running multiple product sizes, the adjustable stroke lets operators quickly reset the cylinder throw for different box heights or part lengths.
Wear Compensation
In clamping or pressing fixtures, the stroke-end screw can be advanced over time to compensate for pad wear or tooling compression, maintaining consistent clamping force without cylinder replacement.
Is the Airtac SCJ50 Standard Cylinder SCJ50X125-75 the Right Cylinder?
Choose the SCJ50X125-75 when you need a mid-range 50 mm bore with on-machine stroke adjustability. If 982 N push is insufficient, stepping up to the 63 mm bore (SCJ63) provides 1559 N of push force at the same 0.5 MPa pressure. For applications that do not require stroke adjustment, the fixed-stroke SC50 series offers a simpler, lower-cost alternative. If side-loads are present, an external guide rail or a guided cylinder should be paired with this unit to protect the rod bearing.
For replacement, match the 50 mm bore, 125 mm nominal stroke, and the full 75 mm adjustment range. The port thread must be PT, and the mounting style must be basic unless an FA, LB, or TC accessory is added. This cylinder does not include a magnet; if sensor feedback is needed, specify the -S suffix on the replacement.
Adjustable-stroke checklist
- ✓ Need to fine-tune stroke on the line?
- ✓ Nominal stroke + adjust range (-75)
- ✓ 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 SCJ50X125-75 FAQ
At 0.5 MPa, the push force is 982 N and the pull force is 825 N. At the maximum operating pressure of 0.9 MPa, push force reaches 1767 N. The pull force is lower because the rod reduces the effective piston area on the return stroke.
A screw in the rear cap sets the stroke end position. You can shorten the effective stroke by up to 75 mm from the 125 mm nominal maximum. It adjusts the end-stop only—it does not change the cylinder's force, speed, or the fact that it is double-acting.
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