The AirTAC Airtac SCJ80 Standard Cylinder SCJ80X300-75 is a genuine double-acting SINGLE-ROD air cylinder with a rear-cap ADJUSTING SCREW: the stroke end is field-adjustable within a 75 mm range without swapping the cylinder. Ø80mm bore, 300mm nominal stroke, PT3/8 ports and adjustable end cushioning.
The SCJ80X300-75 is an 80 mm bore, double-acting, single-rod pneumatic cylinder with a 300 mm nominal stroke and a 75 mm rear adjusting screw. This design allows you to fine-tune the stroke end position in the field without replacing the cylinder or adding external hard stops. It delivers 2513 N of push force and 2268 N of pull force at 0.5 MPa, making it a strong candidate for medium-duty automation tasks where stroke length needs to be dialed in during commissioning or changeovers.
This genuine AirTAC SCJ unit uses a 25 mm diameter piston rod with an M20x1.5 male thread and PT3/8 ports. The body length A(SCJ) is 239 mm, and it features an adjustable air cushion of 28 mm for smooth end-of-stroke deceleration. The operating pressure range is 0.15 to 1.0 MPa, with a proof pressure of 1.5 MPa, and the standard speed range is 30-800 mm/s.
| Model | Airtac SCJ80 Standard Cylinder SCJ80X300-75 |
|---|---|
| Series | SCJ adjustable-stroke tie-rod cylinder |
| Bore size | Ø80 mm |
| Nominal stroke | 300 mm |
| Stroke adjustment | Up to 75 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. |
| -75 | 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.
Dial in the exact end position for a material stop or pusher during initial machine setup. The 75 mm adjustment range lets technicians fine-tune the stroke without swapping out the cylinder.
Quickly adjust a diverter gate or reject station for different product sizes on a packaging line. The rear screw provides a repeatable mechanical stop that can be changed in minutes.
Take up mechanical slack in a clamping or pressing fixture over time. As tooling wears, the stroke end can be extended slightly to maintain consistent contact force and position.
Select the SCJ80X300-75 when you need to precisely set a stroke end within a 75 mm window. If your force requirement is lower, stepping down to a 63 mm bore reduces push force to 1559 N at 0.5 MPa. For higher force, the 100 mm bore provides 3927 N. For a fixed, non-adjustable stroke, the standard SC80X300 is a direct alternative. A direct replacement must match the 80 mm bore, 300 mm nominal stroke, 75 mm adjust range, PT3/8 ports, and basic mounting. At this 300 mm stroke length, be mindful of side loads on the 25 mm rod; use an external guide rail or switch to a guided cylinder if the load is not perfectly axial.
Adjustable-stroke checklist
At 0.5 MPa, the cylinder provides 2513 N of push force and 2268 N of pull force. At the maximum operating pressure of 1.0 MPa, the theoretical push force is 5026 N. The force is identical to a fixed-stroke SC80 cylinder.
A screw in the rear cap acts as an internal, adjustable end stop for the piston. Turning the screw changes the retracted stroke end position by up to 75 mm. It sets a mechanical limit for the stroke but does not lock the piston in place or hold the load when air pressure is removed.
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