The AirTAC Airtac SCJ80 Standard Cylinder SCJ80X275-75 is a genuine double-acting SINGLE-ROD air cylinder with a rear-cap ADJUSTING SCREW: the stroke end is field-adjustable within a 75 mm range without swapping the cylinder. Ø80mm bore, 275mm nominal stroke, PT3/8 ports and adjustable end cushioning.
The SCJ80X275-75 is an 80 mm bore double-acting, single-rod cylinder with a rear adjusting screw that lets you fine-tune the stroke end position by up to 75 mm. Operating at 0.5 MPa, it delivers 2513 N of push force and 2268 N on the pull stroke, making it a solid mid-range actuator for applications that need frequent mechanical end-point changes without swapping the cylinder.
This tie-rod cylinder uses a 25 mm diameter piston rod, PT3/8 ports, and an M20x1.5 rod thread for secure tooling attachment. Its adjustable air cushion decelerates the piston over the final 28 mm of travel, and the body length A(SCJ) is 239 mm. The maximum standard stroke for this bore is 1500 mm, so the 275 mm nominal stroke is well within standard production limits.
| Model | Airtac SCJ80 Standard Cylinder SCJ80X275-75 |
|---|---|
| Series | SCJ adjustable-stroke tie-rod cylinder |
| Bore size | Ø80 mm |
| Nominal stroke | 275 mm |
| Stroke adjustment | Up to 75 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. |
| -75 | 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 75 mm adjustment range allows engineers to experimentally determine the optimal stroke end for a new process without machining custom stops or ordering multiple fixed-stroke cylinders.
On packaging lines that handle multiple product sizes, the rear screw quickly adapts the pusher stroke for different box widths or tray depths, minimizing downtime between production runs.
In high-cycle clamping or pressing fixtures, the adjustable end-stop can be periodically advanced to compensate for tooling or pad wear, maintaining consistent clamping force without replacing the actuator.
Choose the SCJ80X275-75 when you need to dial in a precise mechanical stop during commissioning or format changeovers. If 2513 N of push force is too light, stepping up to the 100 mm bore provides 3927 N at the same 0.5 MPa; if it is more force than needed, the 63 mm bore delivers 1559 N. For applications where the stroke never needs field adjustment, the fixed-stroke SC80 series is a simpler, more cost-effective alternative.
At a 275 mm stroke, be mindful of side-loading on the 25 mm rod. If the load is not guided externally, the rod can deflect under off-axis forces, leading to premature seal wear. In such cases, couple the cylinder with an external linear guide or switch to a guided cylinder. For a drop-in replacement, match the 80 mm bore, 275 mm nominal stroke, 75 mm adjust range, PT3/8 ports, and basic mounting style.
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 push force is higher because the single piston rod reduces the effective area on the pull side. At the maximum operating pressure of 1.0 MPa, the theoretical push force reaches 5026 N.
A screw in the rear cap sets the physical end-stop for the piston's retract stroke. You can shorten the effective stroke by up to 75 mm from the 275 mm nominal maximum. It adjusts only the stroke end position; it does not change the cylinder's force, speed, or the extend stroke length.
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