The AirTAC Airtac SCJ80 Standard Cylinder SCJ80X300-20 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, 300mm nominal stroke, PT3/8 ports and adjustable end cushioning.
The SCJ80X300-20 is a double-acting, single-rod pneumatic cylinder that integrates a rear-cap adjusting screw, giving you a 20 mm field-adjustable range to fine-tune the stroke end position without removing the cylinder. With an 80 mm bore and a 25 mm diameter piston rod, it delivers a substantial 2513 N of push force at 0.5 MPa, making it a powerful yet tunable actuator for medium-to-heavy automation tasks.
This tie-rod cylinder uses a PT3/8 port and features an adjustable air cushion with a 28 mm cushion length to decelerate the piston smoothly. The body length A for this SCJ configuration is 239 mm, providing a compact footprint for its force class. It operates on filtered air from 0.15 to 1.0 MPa and is a genuine AirTAC component built for reliable, repeatable performance.
| Model | Airtac SCJ80 Standard Cylinder SCJ80X300-20 |
|---|---|
| Series | SCJ adjustable-stroke tie-rod cylinder |
| Bore size | Ø80 mm |
| Nominal stroke | 300 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. |
| ×300 | 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.
The 20 mm rear adjuster allows technicians to precisely set the end-of-stroke position during machine commissioning, compensating for assembly tolerances without needing to swap out fixed-stroke cylinders or fabricate shims.
On packaging or sorting lines, quickly adjust the cylinder stroke for different product sizes. The SCJ80X300-20 provides the 2513 N push force needed to handle robust pusher or diverter gates while enabling rapid mechanical format changes.
In high-cycle clamping or pressing fixtures, use the adjustable stroke to take up slack as tooling or contact surfaces wear over time. This maintains consistent clamping force and position without reprogramming the machine's controller.
Choose the SCJ80X300-20 when your application demands a strong push force of 2513 N at standard plant pressure and the ability to dial in the exact stroke end point during commissioning or changeovers. 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 offers 1559 N. For this 300 mm stroke, be mindful of side-loading on the 25 mm rod; if the load is not guided, consider adding an external guide rail or switching to a guided cylinder to prevent rod bending and seal wear.
This model is a direct replacement for an existing AirTAC SCJ80X300-20 with basic mounting, TPU seals, and PT threads. If your current cylinder has a magnet for sensors or a specific mounting like an FA front flange, ensure the replacement code matches those suffixes exactly to maintain full compatibility.
Adjustable-stroke checklist
At the standard operating pressure of 0.5 MPa, the cylinder produces a push force of 2513 N and a pull force of 2268 N. The push force is higher due to the single-rod design. At the maximum operating pressure of 1.0 MPa, the theoretical push force reaches 5026 N.
A rear-cap screw physically limits the piston's stroke end within a 20 mm range, letting you fine-tune the position on the machine. Choose this SCJ model over a fixed-stroke SC when you need to make precise end-point adjustments during setup, for different product formats, or to compensate for wear, without the downtime of replacing the entire cylinder.
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