The AirTAC Airtac SCJ80 Standard Cylinder SCJ80X120-50 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, 120mm nominal stroke, PT3/8 ports and adjustable end cushioning.
The SCJ80X120-50 is a double-acting, single-rod pneumatic cylinder that puts stroke-end fine-tuning directly in your hands. With a 50 mm rear adjusting screw, you can dial in the exact stopping position on the fly—ideal for commissioning new automation or adapting to format changes without swapping the cylinder. The 80 mm bore delivers a substantial 2513 N of push force at a standard 0.5 MPa supply, scaling up to 4523 N at 0.9 MPa.
This model features a 25 mm diameter piston rod, a PT3/8 port, and an M20x1.5 rod-end thread for robust mechanical connection. The integrated air cushion (28 mm) decelerates the piston smoothly at end-of-travel, protecting your tooling. The tie-rod construction keeps it serviceable, and the body length A measures 239 mm, providing a compact yet powerful package for industrial tasks.
| Model | Airtac SCJ80 Standard Cylinder SCJ80X120-50 |
|---|---|
| Series | SCJ adjustable-stroke tie-rod cylinder |
| Bore size | Ø80 mm |
| Nominal stroke | 120 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. |
| ×120 | 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.
Quickly adjust the push stroke for different product sizes on a packaging line. The 50 mm range lets operators fine-tune the cylinder's end stop for varying box widths without mechanical modifications.
Set a precise, repeatable clamp depth for delicate assembly or gluing fixtures. The screw adjustment allows for micron-level end-position tuning, preventing part damage from over-travel.
In high-cycle stamping or pressing operations, tooling surfaces gradually wear down. The adjustable stroke lets you extend the cylinder's reach by up to 50 mm to maintain consistent contact pressure over time.
Choose the SCJ80X120-50 when you need to fine-tune the end position within a 50 mm window without external hard stops. If your force requirement is lower, the SCJ63 series provides 1559 N push at 0.5 MPa; for a step up in power, the SCJ100 bore offers 3927 N. This adjustable-stroke unit is the right call for processes that undergo frequent changeovers. If your application has a fixed, unchanging stroke, a standard SC fixed-stroke cylinder is a simpler, more cost-effective choice. For direct replacement, match the 80 mm bore, 120 mm nominal stroke, 50 mm adjust range, PT3/8 port, and basic mounting. Adding an external guide rail is recommended if the rod is subjected to significant side loads.
Adjustable-stroke checklist
Being a single-rod cylinder, push and pull forces differ. At 0.5 MPa, it generates 2513 N pushing out and 2268 N retracting. At the maximum operating pressure of 1.0 MPa, the theoretical push force reaches 513 kgf (5027 N). Always use the push force for clamping and pressing calculations.
Yes, the mounting footprint and body dimensions are based on the same tie-rod platform, though the SCJ body is slightly longer to house the adjusting screw. Ensure your machine layout can accommodate the rear screw mechanism. The port size (PT3/8) and rod thread (M20x1.5) are identical to the standard SC80.
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