The AirTAC Airtac SCJ80 Standard Cylinder SCJ80X50-50S 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, 50mm nominal stroke, PT3/8 ports and adjustable end cushioning.
The SCJ80X50-50S is an 80 mm bore, double-acting single-rod pneumatic cylinder delivering a push force of 2513 N at 0.5 MPa (4523 N at 0.9 MPa). Its defining feature is a rear-cap adjusting screw that provides a 50 mm stroke-end adjustment range, allowing you to fine-tune the piston's stop position on the fly without changing the cylinder body. The built-in magnet (-S suffix) lets you clamp CMSG/DMSG/EMSG sensors directly to the tie-rod barrel for reliable end-of-stroke detection.
With a 25 mm diameter piston rod, PT3/8 ports, and an M20x1.5 rod thread, this cylinder handles substantial side loads better than smaller bores. The 28 mm air cushion at each end decelerates the piston smoothly, and the body length A(SCJ) is 239 mm. This model is ideal for applications where the exact stroke length needs to be dialed in during commissioning or adjusted for different product formats.
| Model | Airtac SCJ80 Standard Cylinder SCJ80X50-50S |
|---|---|
| Series | SCJ adjustable-stroke tie-rod cylinder |
| Bore size | Ø80 mm |
| Nominal stroke | 50 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. |
| ×50 | 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.
During machine commissioning, the 50 mm adjustment range lets technicians precisely dial in the actuator's end-stop without fabricating shims or repositioning mounts, saving hours of setup time.
On packaging or sorting lines, operators can quickly adjust the stroke to accommodate different box sizes or product widths, minimizing downtime between production runs.
In clamping or pressing fixtures, the adjustable stroke can be extended slightly over time to compensate for pad or tooling wear, maintaining consistent contact force without replacing parts.
Step up to the SCJ100X50-50S if you need more force (3927 N push at 0.5 MPa), or down to the SCJ63X50-50S (1559 N push) for a lighter, more compact solution. The SCJ adjustable-stroke design is the right pick when you need to fine-tune the stroke end position in the field; if your stroke is fixed and never changes, a standard SC80X50-S cylinder is a simpler, more cost-effective alternative. For a direct replacement, match an AirTAC SCJ cylinder with an 80 mm bore, 50 mm nominal stroke, 50 mm adjust range, PT ports, basic mounting, and a built-in magnet.
Adjustable-stroke checklist
At 0.5 MPa, the push force is 2513 N and the pull force is 2268 N (the pull force is lower due to the 25 mm rod area). At the maximum operating pressure of 0.9 MPa, the push force reaches 4523 N.
A rear-cap screw sets the stroke end position within a 50 mm range, shortening the nominal 50 mm stroke. It is not a speed or force control. You can replace a fixed-stroke SC80 with an SCJ80X50-50S if you need field adjustability, but you must ensure the longer SCJ body length (239 mm) fits your mounting space.
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