The AirTAC Airtac SCJ80 Standard Cylinder SCJ80X450-20 is a genuine double-acting SINGLE-ROD air cylinder with a rear-cap ADJUSTING SCREW: the stroke end is field-adjustable within a 20 mm range without swapping the cylinder. Ø80mm bore, 450mm nominal stroke, PT3/8 ports and adjustable end cushioning.
The SCJ80X450-20 delivers 2513 N of push force at 0.5 MPa, making it a capable mid-bore actuator for applications needing a long 450 mm reach with field-adjustable end-position tuning. Its 20 mm rear-cap screw lets you dial in the exact stroke end without swapping the cylinder, which is invaluable during commissioning or format changeovers.
This single-rod, double-acting cylinder uses a 25 mm diameter rod and PT3/8 ports, with an adjustable air cushion that decelerates the piston over the final 28 mm of travel. The tie-rod body measures 239 mm (dimension A) plus stroke, giving it a compact footprint for its force class.
| Model | Airtac SCJ80 Standard Cylinder SCJ80X450-20 |
|---|---|
| Series | SCJ adjustable-stroke tie-rod cylinder |
| Bore size | Ø80 mm |
| Nominal stroke | 450 mm |
| Stroke adjustment | Up to 20 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. |
| -20 | 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.
On a 450 mm stroke box-pushing station, the 20 mm adjuster lets operators quickly compensate for product variance or belt wear, ensuring consistent transfer without mechanical rework.
When clamping workpieces of different thicknesses in a fixture, the rear screw fine-tunes the jaw's closed position, preventing over-travel that could crush thin parts or under-clamp thick ones.
During machine bring-up, engineers can empirically dial in the optimal 450 mm actuator end-point for a new process step, then lock the screw, eliminating the need to stock multiple fixed-stroke cylinders for trials.
For a step down in force, the 63 mm bore SCJ offers 1559 N of push at 0.5 MPa; if you need more muscle, the 100 mm bore provides 3927 N. This SCJ80X450-20 is the right choice when the application demands a 450 mm reach that must be precisely trimmed on-site—if the stroke is absolutely fixed, the standard SC series is a simpler, lower-cost alternative. At this 450 mm stroke length, be mindful of side loads on the 25 mm rod; if the load is not guided externally, consider adding a guide rail or switching to a guided cylinder to prevent rod bending.
For a direct replacement, match an AirTAC SCJ adjustable-stroke cylinder with an 80 mm bore, 450 mm nominal stroke, and a 20 mm adjustment range. Ensure the port thread is PT, the mounting style is basic (or order the correct SCJ accessory bracket such as FA, LB, or TC), and confirm whether a magnet is needed for sensor mounting.
Adjustable-stroke checklist
At the standard 0.5 MPa operating pressure, the push force is 2513 N and the pull force is 2268 N (reduced due to the 25 mm rod area). The maximum push force at 0.9 MPa is 4523 N. The rear adjusting screw changes only the stroke end position, not the cylinder's force output.
Yes, if you need the ability to shorten the stroke end by up to 20 mm. The SCJ body is slightly longer to house the adjustment mechanism. Ensure the port size (PT3/8), mounting style, and any magnet sensor options match your existing setup. If you never need to adjust the stroke, the fixed-stroke SC80 is a more economical choice.
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