The AirTAC Airtac SCJ80 Standard Cylinder SCJ80X125-20STC 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. Ø80mm bore, 125mm nominal stroke, PT3/8 ports and adjustable end cushioning.
The SCJ80X125-20STC is a double-acting, single-rod pneumatic cylinder with a rear-cap adjusting screw that lets you fine-tune the stroke end position by up to 20 mm without removing the cylinder from the machine. Its 80 mm bore delivers 2513 N of push force at 0.5 MPa and 4523 N at 0.9 MPa, making it a strong candidate for medium-to-heavy linear tasks where the final stop point needs precise field adjustment.
This model includes a built-in magnet for direct mounting of CMSG/DMSG/EMSG sensors and ships with a centre trunnion (TC) pivot assembly plus the TCM1 bracket, allowing the cylinder body to swing through an arc under load. The 25 mm rod, PT3/8 ports, and 28 mm air cushion are standard for the 80 mm bore, and the 125 mm nominal stroke is well within the 1500 mm maximum for this frame size.
| Model | Airtac SCJ80 Standard Cylinder SCJ80X125-20STC |
|---|---|
| Series | SCJ adjustable-stroke tie-rod cylinder |
| Bore size | Ø80 mm |
| Nominal stroke | 125 mm |
| Stroke adjustment | Up to 20 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.
| 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.
| SCJ | Adjustable-stroke tie-rod cylinder series. |
|---|---|
| 80 | Bore size in mm. |
| ×125 | 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.
On packaging or labelling machines, use the 20 mm adjusting screw to quickly reposition the cylinder's end stop for different box or product sizes without swapping hard stops or reprogramming servo axes.
The centre trunnion mount lets the cylinder pivot as it strokes. Fine-tune the stroke end to set the precise open or closed angle of a material diverter gate on a conveyor line.
In a welding or assembly fixture, the adjustable stroke compensates for part tolerance stack-up or jaw wear over time, maintaining consistent clamping force without re-machining hard stops.
Choose the SCJ80 series when you need the 2513 N push force at 0.5 MPa that an 80 mm bore provides. If your force requirement is lower, stepping down to a 63 mm bore reduces push to 1559 N at the same pressure; if you need more, the 100 mm bore delivers 3927 N. The 20 mm adjustable range is ideal for commissioning fine-tuning or taking up wear on a fixed stop, but if your application requires a fixed, repeatable stroke with no field changes, the standard SC80 fixed-stroke cylinder is a simpler, lower-cost alternative.
For replacement, match this exact configuration: SCJ80 bore, 125 mm nominal stroke, 20 mm adjust range, PT ports, centre trunnion mounting (F-SC80TC bracket), and the -S magnet for sensors. At 125 mm stroke, rod deflection under side load is minimal, but if the load is not guided, consider adding an external guide rail to protect the rod bearing and seal.
Adjustable-stroke checklist
At 0.5 MPa, it generates 2513 N pushing and 2268 N pulling. At the maximum operating pressure of 1.0 MPa, the theoretical push force is 513 kgf. The push force is higher than the pull force because the single rod reduces the piston area on the return side.
Yes, if the original is an SCJ80 with a 125 mm nominal stroke, 20 mm adjust range, PT ports, centre trunnion mount, and a magnet for sensors. The mounting bracket code is F-SC80TC. Verify the port thread (PT vs G) and seal material before ordering.
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