The AirTAC Airtac SCJ80 Standard Cylinder SCJ80X125-100S is a genuine double-acting SINGLE-ROD air cylinder with a rear-cap ADJUSTING SCREW: the stroke end is field-adjustable within a 100 mm range without swapping the cylinder. Ø80mm bore, 125mm nominal stroke, PT3/8 ports and adjustable end cushioning.
The SCJ80X125-100S is an 80 mm bore, double-acting, single-rod pneumatic cylinder with a field-adjustable stroke. A rear-cap screw provides up to 100 mm of adjustment to fine-tune the stroke end position, making it ideal for commissioning and format changeovers without swapping the cylinder. It delivers a push force of 2513 N at 0.5 MPa and 4523 N at its maximum operating pressure of 0.9 MPa.
This model includes a built-in magnet (-S suffix), allowing easy mounting of CMSG/DMSG/EMSG sensors directly on the tie-rod barrel for precise end-of-stroke detection. The 25 mm diameter rod, PT3/8 port, and 28 mm air cushion ensure reliable, controlled motion. Its body length A(SCJ) is 239 mm, slightly longer than a fixed-stroke SC of the same bore to accommodate the adjusting mechanism.
| Model | Airtac SCJ80 Standard Cylinder SCJ80X125-100S |
|---|---|
| Series | SCJ adjustable-stroke tie-rod cylinder |
| Bore size | Ø80 mm |
| Nominal stroke | 125 mm |
| Stroke adjustment | Up to 100 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. |
| -100 | 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 100 mm adjustment range lets technicians fine-tune the end-stop position during initial machine setup without removing the cylinder, dramatically reducing commissioning time on complex assembly lines.
In high-cycle clamping or pressing fixtures, the adjustable stroke can be periodically shortened to compensate for wear on tooling or workpieces, maintaining consistent clamp force without mechanical shims.
Quickly adapt a diverter or stop gate for different product sizes on a packaging line. The rear screw adjusts the stroke end in seconds, enabling a single actuator to handle multiple formats.
Choose the SCJ80 when you need the 2513 N push force of an 80 mm bore at 0.5 MPa and the ability to dial in the stroke end on the machine. If your application requires a higher force class, stepping up to the 100 mm bore provides 3927 N of push at the same pressure. For applications where the stroke is fixed and never needs field adjustment, the standard SC80 series offers a simpler, more compact solution.
For direct replacement, match an AirTAC SCJ80 with a nominal stroke of 125 mm, a -100 mm adjustable range, PT3/8 ports, and a built-in magnet. The basic mounting configuration uses the cylinder's body for direct installation. For strokes of 300 mm or more, evaluate side-loading on the 25 mm rod; an external guide rail or a switch to a guided cylinder is recommended to prevent rod bending and premature seal wear.
Adjustable-stroke checklist
A screw mechanism in the rear cap limits how far the piston can retract, allowing you to shorten the stroke end by up to 100 mm. The nominal 125 mm stroke is the maximum; you can set any effective stroke down to 25 mm. It adjusts the end position only and does not change the cylinder's force output.
At 0.5 MPa, the push force is 2513 N and the pull force is 2268 N. At the maximum operating pressure of 0.9 MPa, the push force reaches 4523 N. The pull force is lower because the rod reduces the effective piston area on the retract side.
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