The AirTAC Airtac SCJ80 Standard Cylinder SCJ80X80-50 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, 80mm nominal stroke, PT3/8 ports and adjustable end cushioning.
The SCJ80X80-50 is an 80 mm bore, double-acting, single-rod pneumatic cylinder offering a nominal 80 mm stroke with a 50 mm adjustable range via a rear-cap screw. This allows the effective stroke end to be fine-tuned on the machine between 30 and 80 mm without replacing the cylinder. At 0.5 MPa, it delivers 2513 N of push force and 2268 N of pull force, making it suitable for medium-to-heavy linear push/pull tasks.
With a 25 mm diameter piston rod, PT3/8 ports, and an M20x1.5 rod thread, this tie-rod cylinder includes an adjustable air cushion (28 mm length) for smooth deceleration. The body length A(SCJ) is 239 mm, slightly longer than the fixed-stroke SC variant to house the adjusting mechanism. It operates from 0.15 to 1.0 MPa and is rated for speeds of 30-800 mm/s.
| Model | Airtac SCJ80 Standard Cylinder SCJ80X80-50 |
|---|---|
| Series | SCJ adjustable-stroke tie-rod cylinder |
| Bore size | Ø80 mm |
| Nominal stroke | 80 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. |
| ×80 | 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.
Fine-tune the end-of-stroke position on assembly fixtures during initial machine setup. The 50 mm adjustment range lets technicians dial in the exact stop point for different part tolerances without swapping cylinders.
Quickly adapt to different box or pallet sizes on packaging lines. The rear adjusting screw allows operators to change the cylinder's effective stroke in minutes, minimizing downtime between production runs.
In clamping or pressing operations, use the adjustable stroke to take up mechanical wear on tooling or contact surfaces over time. This maintains consistent clamping force without reprogramming the machine controller.
Choose the SCJ80X80-50 when you need to dial in the stroke end position during commissioning or for different product formats, as the 50 mm adjustment range eliminates the need for external hard stops. If a higher force is required, stepping up to the 100 mm bore provides 3927 N of push force at the same pressure. For applications where the stroke is fixed and never needs field adjustment, the standard SC80X80 fixed-stroke cylinder is a simpler, cost-effective alternative.
This model is a direct replacement for another AirTAC SCJ80X80-50 with PT ports and basic mounting. For pivoting loads, the TC centre trunnion mount (F-SC80TC) is available. Always ensure the rod is aligned with the load to prevent side-loading, which can cause premature seal wear and rod bending.
Adjustable-stroke checklist
At 0.5 MPa, the push force is 2513 N and the pull force is 2268 N. The maximum operating pressure is 1.0 MPa, yielding a theoretical push force of 4523 N. The pull force is lower because the rod reduces the effective piston area on the return stroke.
The rear-cap adjusting screw limits the stroke end position within a 50 mm range, so the effective stroke can be set anywhere from 30 to 80 mm. It is a drop-in replacement for an SCJ80X80-50 of the same bore, port thread, and mounting. It cannot directly replace a fixed-stroke SC cylinder unless the mounting and porting are identical and the adjustable feature is needed.
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