The AirTAC Airtac SCJ80 Standard Cylinder SCJ80X125-50S 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.
The SCJ80X125-50S is an 80 mm bore, double-acting single-rod cylinder with a field-adjustable stroke end, providing a nominal 125 mm stroke that can be shortened by up to 50 mm via the rear-cap adjusting screw. This model delivers a push force of 2513 N at 0.5 MPa and 4523 N at 0.9 MPa, using a 25 mm diameter piston rod and PT3/8 ports. The built-in magnet allows direct mounting of CMSG/DMSG/EMSG sensors for reliable end-of-stroke detection.
The adjustable-stroke design is ideal for commissioning and fine-tuning machine stops without swapping cylinders. Its 28 mm air cushion decelerates the piston smoothly, and the tie-rod construction ensures robust, serviceable operation. The body length A(SCJ) is 239 mm, making it a compact solution for applications where the stroke end position must be dialed in precisely on the machine.
| Model | Airtac SCJ80 Standard Cylinder SCJ80X125-50S |
|---|---|
| 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.
| 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. |
| -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.
The 50 mm adjustable stroke allows technicians to dial in the exact end-stop position during initial machine commissioning, eliminating the need to stock multiple fixed-stroke cylinders for trial-and-error setup.
On packaging or sorting lines, the stroke can be quickly re-adjusted to handle different product sizes, making format changeovers faster and reducing downtime compared to swapping out a fixed-stroke actuator.
In clamping or pressing applications, the rear adjusting screw can be used to take up mechanical wear in tooling or workpieces over time, maintaining consistent contact without reprogramming the machine controller.
Choose the SCJ80X125-50S when you need to fine-tune the stroke end position within a 50 mm window during setup or format changes. If your force requirement is lower, the 63 mm bore SCJ series offers 1559 N of push at 0.5 MPa; for higher force, the 100 mm bore provides 3927 N. This adjustable-stroke model is the right choice over a fixed-stroke SC cylinder when the exact stroke length is not finalized or may need periodic adjustment to compensate for wear.
For replacement, match this model with another SCJ80 cylinder with a 125 mm nominal stroke, 50 mm adjust range, PT3/8 ports, and a built-in magnet. The basic mounting configuration can be upgraded with FA front flange, LB foot, or TC centre trunnion mounts from the SCJ accessory subset. At this 125 mm stroke, rod bending from side loads is not a primary concern, but for high-cycle or guided applications, an external guide should be considered.
Adjustable-stroke checklist
At the standard 0.5 MPa operating pressure, the push force is 2513 N and the pull force is 2268 N. The maximum push force at 0.9 MPa is 4523 N. Because this is a single-rod cylinder, the push force is greater than the pull force due to the area of the 25 mm rod.
You can replace a fixed-stroke SC80 with this SCJ80X125-50S if you need the added benefit of a field-adjustable stroke end. Ensure the nominal stroke, port size (PT3/8), and mounting style match. The SCJ body is slightly longer to accommodate the adjusting screw mechanism, so verify the available installation space.
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