The AirTAC Airtac SCJ80 Standard Cylinder SCJ80X50-40S is a genuine double-acting SINGLE-ROD air cylinder with a rear-cap ADJUSTING SCREW: the stroke end is field-adjustable within a 40 mm range without swapping the cylinder. Ø80mm bore, 50mm nominal stroke, PT3/8 ports and adjustable end cushioning.
The SCJ80X50-40S is an 80 mm bore double-acting single-rod cylinder with a field-adjustable stroke end. A rear-cap screw lets you shorten the stroke by up to 40 mm without changing the cylinder, delivering 2513 N of push force at 0.5 MPa and 4523 N at 0.9 MPa. The 25 mm rod and PT3/8 ports handle substantial loads, while the 28 mm air cushion decelerates the piston smoothly.
This model includes a built-in magnet (-S suffix), so CMSG/DMSG/EMSG reed or solid-state sensors clamp directly onto the tie-rod barrel for reliable end-of-stroke sensing. The body length A(SCJ) is 239 mm, slightly longer than a fixed-stroke SC of the same bore to accommodate the adjusting mechanism. It is a genuine AirTAC component, factory-tested for consistent performance in demanding pneumatic circuits.
| Model | Airtac SCJ80 Standard Cylinder SCJ80X50-40S |
|---|---|
| Series | SCJ adjustable-stroke tie-rod cylinder |
| Bore size | Ø80 mm |
| Nominal stroke | 50 mm |
| Stroke adjustment | Up to 40 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. |
| ×50 | Nominal (maximum) stroke length in mm. |
| -40 | 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.
During machine commissioning, the 40 mm adjustment range lets technicians dial in the exact stroke end position without fabricating custom stops, speeding up line start-up.
On packaging or assembly lines, the screw adjuster allows operators to quickly change the stroke for different product sizes, reducing downtime between batches.
In clamping or pressing fixtures, the adjustable stroke can be periodically tweaked to compensate for pad wear or tooling compression, maintaining consistent contact force.
Choose the SCJ80 bore when your application needs the 2513 N push force at 0.5 MPa that an 80 mm cylinder provides. If space or force requirements are lower, stepping down to the 63 mm bore delivers 1559 N push; for heavier loads, the 100 mm bore offers 3927 N push at the same pressure. The SCJ adjustable-stroke design is the right pick when you need to fine-tune the stroke end during commissioning, for format changes, or to take up tooling wear without swapping the cylinder. If your stroke length is fixed and will never need adjustment, the standard SC80 fixed-stroke cylinder is a simpler, cost-effective alternative.
For a direct replacement, match an AirTAC SCJ80 cylinder with an 80 mm bore, 50 mm nominal stroke, and a 40 mm adjustment range, with PT ports, a built-in magnet, and basic mounting. The 50 mm stroke is short and well-supported by the cylinder's bearings, so side-load concerns are minimal in this configuration.
Adjustable-stroke checklist
At 0.5 MPa, the push force is 2513 N and the pull force is 2268 N (reduced by the 25 mm rod area). At the maximum operating pressure of 1.0 MPa, the theoretical push force reaches 5026 N. The rear adjusting screw changes only the stroke end position, not the force output.
A screw in the rear cap limits how far the piston retracts, shortening the effective stroke by up to 40 mm from the 50 mm nominal maximum. You can use an SCJ80 in place of an SC80 if you need field-adjustable stroke trimming, but the SCJ body is slightly longer. For a fixed, non-adjustable stroke, the standard SC80 is the direct choice.
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