The AirTAC Airtac SCJ80 Standard Cylinder SCJ80X75-50 is a genuine double-acting SINGLE-ROD air cylinder with a rear-cap ADJUSTING SCREW: the stroke end is field-adjustable within a 50 mm range without swapping the cylinder. Ø80mm bore, 75mm nominal stroke, PT3/8 ports and adjustable end cushioning.
The SCJ80X75-50 is a double-acting, single-rod pneumatic cylinder that integrates a rear-cap adjusting screw, giving you 50 mm of field-adjustable stroke-end control without removing the cylinder from the machine. With an 80 mm bore, it delivers 2513 N of push force at 0.5 MPa and 4523 N at the maximum operating pressure of 0.9 MPa, while the 25 mm piston rod and 28 mm air cushion provide robust deceleration for mid-to-heavy linear moves.
This adjustable-stroke design uses the nominal 75 mm as its maximum extension, and the -50 suffix means you can shorten the stroke end by up to 50 mm for precise commissioning, format changeovers, or wear take-up. The body length A(SCJ) is 239 mm, making it slightly longer than a fixed-stroke SC of the same bore, and it uses a standard PT3/8 port with an M20x1.5 rod thread.
| Model | Airtac SCJ80 Standard Cylinder SCJ80X75-50 |
|---|---|
| Series | SCJ adjustable-stroke tie-rod cylinder |
| Bore size | Ø80 mm |
| Nominal stroke | 75 mm |
| Stroke adjustment | Up to 50 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. |
| ×75 | Nominal (maximum) stroke length in mm. |
| -50 | 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 50 mm rear-screw adjustment lets technicians dial in the exact stroke end-stop on a new packaging machine without swapping cylinders or fabricating external hard stops, speeding up line commissioning.
Quickly adapt the stroke of a diverter gate or pusher on a conveyor system when switching between product sizes. The field-adjustable screw accommodates different box widths without any disassembly.
In clamping or pressing fixtures, the adjustable stroke end can be extended slightly over time to compensate for pad or tooling wear, maintaining consistent clamping force without replacing the cylinder.
Choose the SCJ80X75-50 when your application requires on-machine stroke fine-tuning within a 50 mm window. If you need more force, stepping up to the 100 mm bore provides 3927 N of push at 0.5 MPa; for a lighter, more compact solution, the 63 mm bore delivers 1559 N. The adjustable stroke is ideal for commissioning trials, but if your stroke is permanently fixed, a standard SC cylinder eliminates the adjusting mechanism for a simpler, lower-cost assembly.
For direct replacement, match the 80 mm bore, 75 mm nominal stroke, 50 mm adjust range, PT3/8 port thread, and basic mounting. If you later need a pivoting mount, the TC centre trunnion with the TCM1 bracket (F-SC80TC) is available. This cylinder does not include a magnet; order the -S variant if you plan to use CMSG or DMSG sensors.
Adjustable-stroke checklist
Because it is a single-rod cylinder, push and pull forces differ. At 0.5 MPa, the push force is 2513 N and the pull force is 2268 N. At the maximum operating pressure of 0.9 MPa, the push force reaches 4523 N. The rear adjusting screw only changes the stroke end position, not the force output.
You can, but the SCJ body is slightly longer (A=239 mm) to house the adjusting screw. Ensure you have clearance at the rear cap. The mounting, port size (PT3/8), and rod thread (M20x1.5) are identical, but you must match the 50 mm adjust range if your process requires the full 75 mm stroke to be available.
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