The AirTAC Airtac SCJ80 Standard Cylinder SCJ80X125-30 is a genuine double-acting SINGLE-ROD air cylinder with a rear-cap ADJUSTING SCREW: the stroke end is field-adjustable within a 30 mm range without swapping the cylinder. Ø80mm bore, 125mm nominal stroke, PT3/8 ports and adjustable end cushioning.
The SCJ80X125-30 is an 80 mm bore double-acting single-rod pneumatic cylinder with a rear adjusting screw that lets you fine-tune the stroke end position within a 30 mm range without swapping the unit. It delivers 2513 N of push force and 2268 N of pull force at 0.5 MPa, using a 25 mm diameter piston rod and PT3/8 ports. The adjustable-stroke design is ideal for commissioning trials, format changeovers, or taking up mechanical wear where the exact end stop needs to be dialled in on the machine.
Built on a proven tie-rod platform, this cylinder includes an adjustable air cushion (28 mm long) at both ends to decelerate the piston smoothly, supporting speeds from 30 to 800 mm/s. The body length A(SCJ) is 239 mm, slightly longer than a fixed-stroke SC of the same bore to accommodate the adjusting mechanism. At the maximum operating pressure of 0.9 MPa, the push force reaches 4523 N, giving you a robust actuator for positioning and clamping tasks that benefit from on-the-fly stroke adjustment.
| Model | Airtac SCJ80 Standard Cylinder SCJ80X125-30 |
|---|---|
| Series | SCJ adjustable-stroke tie-rod cylinder |
| Bore size | Ø80 mm |
| Nominal stroke | 125 mm |
| Stroke adjustment | Up to 30 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. |
| ×125 | Nominal (maximum) stroke length in mm. |
| -30 | 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 stop during machine commissioning without removing the cylinder. The 30 mm screw adjustment lets technicians quickly dial in the exact stroke needed for a new tool or fixture.
On packaging or assembly lines, adjust the stroke end to accommodate different product sizes. The SCJ80X125-30 eliminates the need to stock multiple fixed-stroke cylinders for each format.
In clamping or pressing operations, use the rear screw to take up mechanical wear on pads or tooling over time, maintaining consistent contact without reprogramming the machine controller.
Choose the SCJ80X125-30 when your application needs a nominal 125 mm stroke with the ability to shorten the end position by up to 30 mm during setup or production. If you require more force, stepping up to the 100 mm bore SCJ100 series provides 3927 N of push at 0.5 MPa. For applications where the stroke never needs field adjustment, the fixed-stroke SC80X125 is a simpler, slightly shorter alternative. Should your load need guided support against side forces—especially with a 125 mm stroke—consider pairing this cylinder with an external guide rail or switching to a guided cylinder. A direct replacement must match the 80 mm bore, 125 mm nominal stroke, 30 mm adjust range, PT3/8 ports, basic mounting, and the absence of a magnet.
Adjustable-stroke checklist
At 0.5 MPa, the push force is 2513 N and the pull force is 2268 N (the difference is due to the 25 mm rod reducing the piston area on the return side). At the maximum operating pressure of 0.9 MPa, the push force increases to 4523 N.
Yes, this is a genuine AirTAC SCJ80X125-30. It is a direct dimensional and performance match for any AirTAC SCJ80 cylinder with a 125 mm nominal stroke and a 30 mm adjust range, provided the port thread (PT), mounting style (basic), and magnet option (none) are the same.
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