Airtac SCJ80 Standard Cylinder SCJ80X125-50
The AirTAC Airtac SCJ80 Standard Cylinder SCJ80X125-50 is a genuine double-acting SINGLE-ROD air cylinder with a rear-cap ADJUSTING SCREW: the stroke end is field-adjustable within a 50 mm range without swapping the cylinder. Ø80mm bore, 125mm nominal stroke, PT3/8 ports and adjustable end cushioning.
- BoreØ80 mm
- Nominal stroke125 mm
- Stroke adjust-50 mm
- Port sizePT3/8
- Rod threadM20×1.5
- CushionAdjustable, 28 mm
About the Airtac SCJ80 Standard Cylinder SCJ80X125-50
The SCJ80X125-50 is a double-acting, single-rod pneumatic cylinder that puts 2513 N of push force at 0.5 MPa behind a 25 mm diameter piston rod. Its defining feature is a rear-cap adjusting screw that lets you shorten the stroke end by up to 50 mm on the machine, giving a true field-adjustable range without swapping the cylinder or adding external hard stops.
Built on the proven SC tie-rod platform, this 80 mm bore unit has a 28 mm air cushion at each end for smooth deceleration and a body length A of 239 mm. It operates on 40 µm filtered air from 0.15 to 1.0 MPa and handles speeds of 30-800 mm/s, making it a robust choice for commissioning trials and format-change applications where the final stroke position needs fine-tuning under load.
Airtac SCJ80 Standard Cylinder SCJ80X125-50 Technical Specifications
| Model | Airtac SCJ80 Standard Cylinder SCJ80X125-50 |
|---|---|
| Series | SCJ adjustable-stroke tie-rod cylinder |
| Bore size | Ø80 mm |
| Nominal stroke | 125 mm |
| Stroke adjustment | Up to 50 mm (rear adjusting screw) |
| Acting type | Double acting (single rod) |
| Port size | PT3/8 |
| Rod thread | M20×1.5 |
| 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, 28 mm |
| Max stroke | Up to 1500 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 (Ø80mm)
| Pressure | Push force | Pull force |
|---|---|---|
| 0.5 MPa | 2513 N | 2268 N |
| 0.7 MPa | 3519 N | — |
| Max (@1.0 MPa) | 513 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 SCJ80 Standard Cylinder SCJ80X125-50
| SCJ | Adjustable-stroke tie-rod cylinder series. |
|---|---|
| 80 | Bore size in mm. |
| ×125 | Nominal (maximum) stroke length in mm. |
| -50 | 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 SCJ80 Standard Cylinder SCJ80X125-50 Is Used
Commissioning & Setup
Fine-tune the end position during machine commissioning without re-plumbing or machining new stops. The 50 mm adjustment range lets you dial in the exact stroke for optimal pick-and-place or clamping depth.
Format Changeover
Quickly adapt to different product sizes on a packaging or assembly line. The rear screw adjusts the stroke end to handle varying box widths or pallet stops, reducing downtime between production runs.
Wear Compensation
Take up mechanical wear in tooling or grippers over time. Instead of replacing the cylinder, simply adjust the stroke end to restore the precise actuator position, extending the service life of your end-of-arm tooling.
Is the Airtac SCJ80 Standard Cylinder SCJ80X125-50 the Right Cylinder?
Choose the SCJ80 when you need the 80 mm bore's 2513 N push force at 0.5 MPa but also require stroke-end adjustability. If your force demand is lower, the 63 mm bore SCJ63 series delivers 1559 N push at the same pressure in a lighter package. For higher force, step up to the SCJ100 which provides 3927 N push. The adjustable stroke is ideal for commissioning and changeover; if your stroke is permanently fixed, the standard SC80 series is a simpler, cost-effective alternative. This SCJ80X125-50 is a direct replacement for an existing AirTAC SCJ80X125-50 with a 50 mm adjust range, PT3/8 ports, and basic mounting. For strokes of 300 mm or longer, evaluate side-load and rod bending—consider an external guide or a guided cylinder if the load is not perfectly axial.
Adjustable-stroke checklist
- ✓ Need to fine-tune stroke on the line?
- ✓ Nominal stroke + adjust range (-50)
- ✓ 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 SCJ80 Standard Cylinder SCJ80X125-50 FAQ
At 0.5 MPa, the push force is 2513 N and the pull force is 2268 N (the difference is due to the 25 mm rod area). At the maximum operating pressure of 0.9 MPa, the push force reaches 4523 N. The theoretical maximum at 1.0 MPa is 513 kgf.
Yes, if you need field-adjustable stroke. The SCJ80X125-50 shares the same 80 mm bore, PT3/8 ports, and mounting accessories as the SC80. However, the body length A is 239 mm, which is slightly longer than the fixed-stroke version to accommodate the rear adjusting screw. Ensure you have clearance for the screw mechanism.
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