The AirTAC Airtac SCJ80 Standard Cylinder SCJ80X30-20S 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, 30mm nominal stroke, PT3/8 ports and adjustable end cushioning.
The SCJ80X30-20S is an 80 mm bore double-acting single-rod cylinder with a rear-cap adjusting screw that provides up to 20 mm of field-adjustable stroke reduction. This model delivers 2513 N of push force at 0.5 MPa and features a 25 mm piston rod, PT3/8 ports, and a 28 mm air cushion for smooth deceleration.
A built-in magnet (-S suffix) allows direct mounting of CMSG/DMSG/EMSG sensors on the tie-rod barrel for non-contact position sensing. The cylinder operates on filtered air from 0.15 to 1.0 MPa and is suited for applications where the stroke end position must be fine-tuned during commissioning or after mechanical wear.
| Model | Airtac SCJ80 Standard Cylinder SCJ80X30-20S |
|---|---|
| Series | SCJ adjustable-stroke tie-rod cylinder |
| Bore size | Ø80 mm |
| Nominal stroke | 30 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. |
| ×30 | 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.
The 20 mm adjusting screw lets technicians fine-tune the end-stop position during machine commissioning without swapping out the cylinder or adding external hard stops.
In clamping or pressing fixtures, the stroke can be incrementally shortened to compensate for tooling or pad wear over time, maintaining consistent contact force.
On packaging or sorting lines, the adjustable stroke allows a single cylinder model to be quickly reset for different product sizes, reducing changeover time.
Choose the SCJ80X30-20S when you need to dial in a precise stroke end within a 20 mm window without changing the cylinder. If the 2513 N push force at 0.5 MPa is insufficient, stepping up to the 100 mm bore provides 3927 N; if the force is excessive for your load, the 63 mm bore delivers 1559 N. This adjustable-stroke model is ideal for format changeovers and trial setups, but if the stroke is fixed and never needs field adjustment, the standard SC fixed-stroke cylinder is a more economical choice. For a direct replacement, match an AirTAC SCJ cylinder with an 80 mm bore, 30 mm nominal stroke, a 20 mm adjust range, PT ports, basic mounting, and the -S magnet option.
Adjustable-stroke checklist
At 0.5 MPa, the push force is 2513 N and the pull force is 2268 N. The maximum push force at the 0.9 MPa operating limit is 4523 N. Because it is a single-rod cylinder, the push force is greater than the pull force due to the rod area on the return side.
It can be used if the 30 mm nominal stroke and the 20 mm adjust range are suitable for your application. The SCJ80X30-20S has a longer body length than a fixed-stroke SC80 due to the adjusting mechanism. For a direct dimensional match, you would need an SCJ80X50-20 to replace the SC80X50's 50 mm stroke.
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