The AirTAC Airtac SCJ80 Standard Cylinder SCJ80X125-75TC 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, 125mm nominal stroke, PT3/8 ports and adjustable end cushioning.
The SCJ80X125-75TC is a double-acting, single-rod pneumatic cylinder that puts stroke-end tuning directly on the machine. Its rear-cap adjusting screw provides up to 75 mm of field-adjustable stroke reduction from the 125 mm nominal maximum, letting commissioning engineers dial in the exact end position without swapping cylinders or adding external hard stops. The 80 mm bore generates 2513 N of push force at 0.5 MPa, making it a solid mid-range actuator for pressing, clamping and material-transfer tasks.
This model is configured with a centre trunnion (TC) mount, which allows the cylinder body to pivot as the rod extends and retracts—ideal for swinging or articulating linkages. The trunnion is supplied with the TCM1 bracket for direct machine-frame installation. The 25 mm diameter piston rod and 28 mm air cushion at each end help manage deceleration, while the PT3/8 ports keep flow rates high for speeds up to 800 mm/s. Body length A(SCJ) is 239 mm.
| Model | Airtac SCJ80 Standard Cylinder SCJ80X125-75TC |
|---|---|
| Series | SCJ adjustable-stroke tie-rod cylinder |
| Bore size | Ø80 mm |
| Nominal stroke | 125 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. |
| ×125 | 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.
The 75 mm adjustment screw lets operators quickly reset the stroke end for different box or pallet sizes on packaging lines without mechanical rework.
Dial in the exact jaw-closing position on a welding or assembly fixture to accommodate part tolerances, using the full 2513 N push force at 0.5 MPa.
The TC centre trunnion mount allows the cylinder to swing freely, while the adjustable stroke sets the precise gate angle on a conveyor sorting system.
Choose the SCJ80 bore when your application needs roughly 2513 N of push force at standard plant air. If you can accept a lighter actuator, the 63 mm bore delivers 1559 N push, which may reduce air consumption and mounting footprint. For higher force, stepping up to the 100 mm bore provides 3927 N push. The 75 mm adjustable range on this model is well suited to processes with multiple product heights or where tooling wear requires periodic stroke compensation.
If your motion is purely linear with no need for field adjustment, the fixed-stroke SC80X125 is a simpler, lower-cost alternative. For direct replacement, match the 80 mm bore, 125 mm nominal stroke, -75 adjust range, PT port thread, and TC centre trunnion mounting (order F-SC80TC with the TCM1 bracket). At 125 mm stroke, rod bending from side loads is unlikely, but always align the rod with the load path and avoid off-axis forces to maximise seal life.
Adjustable-stroke checklist
At 0.5 MPa, it delivers 2513 N pushing and 2268 N pulling. At the maximum operating pressure of 0.9 MPa, the push force reaches 4523 N. The pull force is lower because the 25 mm rod reduces the effective piston area on the return stroke.
Only if you need the adjustable stroke feature. The SCJ80 body is slightly longer to house the rear adjusting screw. For a direct SCJ replacement, match the 80 mm bore, 125 mm nominal stroke, -75 adjust range, PT thread, and TC centre trunnion mount. If you do not need stroke adjustment, the fixed-stroke SC80 is the direct equivalent.
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