The AirTAC Airtac SCJ80 Standard Cylinder SCJ80X55-50 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, 55mm nominal stroke, PT3/8 ports and adjustable end cushioning.
The SCJ80X55-50 is an 80 mm bore double-acting single-rod cylinder with a 55 mm nominal stroke, featuring a rear-cap adjusting screw that provides a 50 mm field-adjustable range for fine-tuning the stroke end position. Operating on filtered air at 0.15-1.0 MPa, this tie-rod cylinder delivers a push force of 2513 N at 0.5 MPa, rising to 4523 N at 0.9 MPa, with a 25 mm diameter piston rod and PT3/8 ports.
Its adjustable-stroke design allows machine builders to dial in the exact end-stop required during commissioning or format changes without swapping the cylinder or adding external hard stops. The 28 mm air cushion at each end decelerates the piston smoothly, and the cylinder body length A(SCJ) is 239 mm. This model comes with a basic mount, TPU seals for -20 to +70 C, and standard PT threads.
| Model | Airtac SCJ80 Standard Cylinder SCJ80X55-50 |
|---|---|
| Series | SCJ adjustable-stroke tie-rod cylinder |
| Bore size | Ø80 mm |
| Nominal stroke | 55 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. |
| ×55 | 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.
During machine setup, the 50 mm adjust range lets technicians dial in the precise retract position for a pneumatic gate or stop without iterative disassembly or shimming.
On packaging lines, operators can quickly re-set the stroke end to accommodate different box or product sizes by turning the rear adjusting screw, minimizing downtime between batches.
In clamping or pressing fixtures, the adjustable stroke allows the end position to be extended slightly over time to compensate for tooling or pad wear, maintaining consistent clamping force.
Choose the SCJ80 when you need around 2513 N of push force at standard plant pressure and the ability to trim the stroke end by up to 50 mm on the machine. If your force requirement is lower, stepping down to the 63 mm bore (1559 N push at 0.5 MPa) saves space; for heavier loads, the 100 mm bore provides 3927 N push. This adjustable-stroke unit is ideal where the exact retract position needs field tuning—if the stroke is fixed and known, a standard SC80 fixed-stroke cylinder is a simpler, more economical alternative. For direct replacement, match an AirTAC SCJ80 with a 55 mm nominal stroke, -50 adjust range, PT ports, and the same basic mounting configuration.
Adjustable-stroke checklist
As a single-rod double-acting 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.
You can use it as a replacement if the adjustable stroke feature is acceptable, but the body length is slightly longer than a fixed-stroke SC80. Ensure the 55 mm nominal stroke and 50 mm adjust range suit your application, and verify that the mounting (basic), port thread (PT), and magnet option (none) match your existing setup.
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