The AirTAC Airtac SCJ80 Standard Cylinder SCJ80X120-30S is a genuine double-acting SINGLE-ROD air cylinder with a rear-cap ADJUSTING SCREW: the stroke end is field-adjustable within a 30 mm range without swapping the cylinder. Ø80mm bore, 120mm nominal stroke, PT3/8 ports and adjustable end cushioning.
The SCJ80X120-30S is an 80 mm bore double-acting single-rod air cylinder with a rear adjusting screw that lets you fine-tune the stroke end position by up to 30 mm without removing the cylinder from the machine. Its 25 mm diameter piston rod delivers a solid 2513 N push force at 0.5 MPa (4523 N at 0.9 MPa), making it a strong candidate for medium-to-heavy pneumatic tasks where the final stop point needs to be dialled in precisely during commissioning or after tooling wear.
This model includes a built-in magnet (-S suffix), so standard CMSG/DMSG/EMSG reed or solid-state sensors clamp directly onto the tie-rod barrel for reliable end-of-stroke detection. The cylinder body length (A dimension) is 239 mm, and it uses PT3/8 ports with an adjustable air cushion of 28 mm at each end to decelerate the piston smoothly. Operating pressure is 0.15–1.0 MPa with a speed range of 30–800 mm/s.
| Model | Airtac SCJ80 Standard Cylinder SCJ80X120-30S |
|---|---|
| Series | SCJ adjustable-stroke tie-rod cylinder |
| Bore size | Ø80 mm |
| Nominal stroke | 120 mm |
| Stroke adjustment | Up to 30 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. |
| ×120 | Nominal (maximum) stroke length in mm. |
| -30 | 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 lines, the 30 mm adjust range lets operators quickly reset the cylinder’s end position for different box heights or product sizes without swapping hard stops.
In a CNC fixture or welding jig, the adjustable stroke screw takes up pad wear over time, maintaining consistent clamp force and part registration without reprogramming the machine.
During machine build and debug, engineers can incrementally dial in the exact stroke end for a pusher or ejector, saving the cost of multiple fixed-stroke cylinders.
Step up to the SCJ100 series if your load demands more than the 2513 N push this 80 mm bore delivers at 0.5 MPa—the 100 mm bore provides 3927 N. If you never need to alter the stroke after installation, the fixed-stroke SC80 series offers the same force and mounting footprint without the adjusting mechanism. For a direct replacement, match an SCJ80 with a 120 mm nominal stroke, 30 mm adjust range, PT3/8 ports, basic mounting, and a magnet-equipped barrel (-S). When strokes exceed 300 mm, consider an external guide rail or a guided cylinder to protect the 25 mm rod from side-load bending.
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 difference is due to the single 25 mm rod area). At the maximum operating pressure of 1.0 MPa, the theoretical push force reaches 5026 N.
Only if you need the stroke-end adjustment feature. The SCJ80 body is slightly longer (A=239 mm) than a fixed-stroke SC80 to house the rear screw. For a drop-in replacement of a fixed-stroke SC80, use another SC80. If you need adjustability, match the bore, nominal stroke, port thread, and magnet option.
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