The AirTAC Airtac SCJ80 Standard Cylinder SCJ80X450-75S 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, 450mm nominal stroke, PT3/8 ports and adjustable end cushioning.
The SCJ80X450-75S is a double-acting, single-rod pneumatic cylinder with a field-adjustable stroke, delivering a push force of 2513 N at 0.5 MPa and up to 4523 N at 0.9 MPa. Its rear-cap adjusting screw provides a 75 mm range to fine-tune the stroke end position, making it ideal for commissioning adjustments or format changeovers without swapping the cylinder. The 25 mm rod and PT3/8 ports handle demanding mid-range automation tasks.
This model includes a built-in magnet (-S), allowing direct mounting of CMSG, DMSG, or EMSG sensors along the tie-rod barrel for reliable end-of-stroke detection. With a 28 mm air cushion and a body length A of 239 mm, it operates smoothly within a 30-800 mm/s speed range. The 450 mm nominal stroke is well within the 1500 mm maximum standard stroke for the 80 mm bore.
| Model | Airtac SCJ80 Standard Cylinder SCJ80X450-75S |
|---|---|
| Series | SCJ adjustable-stroke tie-rod cylinder |
| Bore size | Ø80 mm |
| Nominal stroke | 450 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. |
| ×450 | 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 allows engineers to precisely dial in the stroke end position during initial machine setup, eliminating the need for physical stops and reducing commissioning time.
On packaging or sorting lines, the adjustable stroke enables a quick change between different product sizes. The 2513 N push force at 0.5 MPa is sufficient for diverting or stopping medium-weight packages.
In long-running assembly fixtures, the stroke can be incrementally adjusted to compensate for wear on tooling or contact surfaces, maintaining precise part placement without cylinder replacement.
Choose the SCJ80X450-75S when you need a robust 80 mm bore cylinder with a long 450 mm reach and the ability to dial in the stroke end by up to 75 mm on the machine. If your force requirements are lower, stepping down to the 63 mm bore (1559 N push at 0.5 MPa) can save space and air consumption. For applications needing a fixed, non-adjustable stroke, the standard SC80X450 is a direct alternative. This SCJ model is a drop-in replacement for another AirTAC SCJ80X450-75S with a PT port, basic mount, and magnet. For a 450 mm stroke, ensure the rod is not subjected to high side loads; use an external guide or switch to a guided cylinder if the load is not perfectly axial.
Adjustable-stroke checklist
At 0.5 MPa, the cylinder provides a push force of 2513 N and a pull force of 2268 N. The maximum push force at the 0.9 MPa operating limit is 4523 N. The pull force is lower due to the area of the 25 mm piston rod.
A rear-cap screw lets you shorten the stroke end by up to 75 mm from the 450 mm nominal maximum. Choose the SCJ when you need to fine-tune the stroke on-site for setup, changeovers, or wear take-up. If your stroke is a fixed, unchanging value, the simpler SC series is a more cost-effective choice.
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