The AirTAC Airtac SCJ80 Standard Cylinder SCJ80X275-20S 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, 275mm nominal stroke, PT3/8 ports and adjustable end cushioning.
The SCJ80X275-20S is an 80 mm bore double-acting, single-rod pneumatic cylinder with a field-adjustable stroke end, offering 2513 N of push force at 0.5 MPa. Its rear-cap adjusting screw provides up to 20 mm of stroke-end reduction, letting you fine-tune the piston's stop position without removing the cylinder or adding external hard stops—ideal for commissioning and format changeovers on medium-duty automation.
This model includes a built-in magnet (-S suffix) for direct mounting of CMSG/DMSG/EMSG reed or solid-state sensors, enabling precise end-of-stroke detection. With a 25 mm piston rod, PT3/8 ports, and a 28 mm air cushion, it handles speeds of 30-800 mm/s. The tie-rod body length (A dimension) is 239 mm, making it a compact solution for space-constrained adjustable-stroke applications.
| Model | Airtac SCJ80 Standard Cylinder SCJ80X275-20S |
|---|---|
| Series | SCJ adjustable-stroke tie-rod cylinder |
| Bore size | Ø80 mm |
| Nominal stroke | 275 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. |
| ×275 | 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 allows technicians to dial in the exact stroke end position during initial machine setup, compensating for minor fabrication tolerances in the tooling or frame without needing to re-machine any hard stops.
On a packaging line handling different box sizes, the adjustable stroke lets operators quickly reset the pusher's end position. The 275 mm stroke with a 20 mm fine-tune range covers multiple formats with a single cylinder model.
In clamping or pressing fixtures, the stroke end can be adjusted over time to take up wear on contact pads or tooling surfaces. The built-in magnet provides sensor feedback to confirm the new end position is reached on every cycle.
Choose the SCJ80X275-20S when your application needs a 275 mm nominal stroke with the ability to shorten the end position by up to 20 mm on the machine. If you require more force, stepping up to the 100 mm bore SCJ100 series provides 3927 N of push at 0.5 MPa. For a fixed, non-adjustable stroke, the standard SC80 series is a simpler alternative. This cylinder is a direct replacement for another AirTAC SCJ80X275-20S with PT ports and a magnet, matching the same bore, nominal stroke, and 20 mm adjust range.
At a 275 mm stroke, consider the potential for side loading on the 25 mm rod. If the load is not guided and purely axial, an external guide rail or switching to a guided cylinder will prevent rod bending and premature seal wear, ensuring long service life.
Adjustable-stroke checklist
At the standard operating pressure of 0.5 MPa, this 80 mm bore cylinder generates 2513 N of push force and 2268 N of pull force. The push force is higher because the single rod reduces the effective piston area on the return stroke. At the maximum operating pressure of 1.0 MPa, the theoretical push force is 5026 N.
A rear-cap adjusting screw lets you shorten the stroke end by up to 20 mm, providing on-machine flexibility. Choose the SCJ when you need to fine-tune the stop position for different setups or to compensate for wear. A fixed-stroke SC cylinder is the better choice if the stroke length is permanent and you want the simplest, most cost-effective solution.
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