The AirTAC Airtac SCJ80 Standard Cylinder SCJ80X300-20S 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 SCJ80X300-20S is an 80 mm bore double-acting single-rod cylinder with a rear adjusting screw that provides up to 20 mm of field-adjustable stroke-end reduction. At 0.5 MPa it delivers 2513 N push and 2268 N pull, suiting it for mid-range force applications where fine-tuning the retract end position is needed during commissioning or format changes.
This model includes a built-in magnet (-S suffix), allowing CMSG/DMSG/EMSG reed or solid-state sensors to be clamped directly onto the tie-rod barrel for non-contact position sensing. The 25 mm diameter piston rod, PT3/8 ports, and 28 mm air cushion work together for smooth deceleration, while the 239 mm body length A(SCJ) keeps the assembly compact for its 300 mm nominal stroke.
| Model | Airtac SCJ80 Standard Cylinder SCJ80X300-20S |
|---|---|
| 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 screw lets technicians dial in the exact retract stop position during machine build and runoff, eliminating the need to machine custom end stops for each station.
On packaging lines handling multiple box sizes, the adjustable stroke allows operators to quickly reset the pusher end position between batches, reducing downtime compared to fixed-stroke cylinders.
In clamping or pressing fixtures, the stroke can be extended slightly over time to compensate for pad wear or tooling compression, maintaining consistent clamp force without replacing the actuator.
Choose the SCJ80 when you need roughly 2500 N of push force at standard shop air and the ability to trim the stroke end by up to 20 mm without swapping the cylinder. If your load requires more force, stepping up to the 100 mm bore SCJ100 provides 3927 N push at the same 0.5 MPa pressure. For applications that do not need stroke adjustability, the fixed-stroke SC80 is a simpler alternative.
This cylinder has a 300 mm nominal stroke, so ensure the rod is supported against side loads if the attachment point is not perfectly aligned; an external guide rail or switching to a guided cylinder will prevent rod bending and premature seal wear. The SCJ80X300-20S is a direct replacement for another AirTAC SCJ80 of the same stroke, 20 mm adjust range, PT port thread, and magnet-equipped configuration.
Adjustable-stroke checklist
At 0.5 MPa the push force is 2513 N and the pull force is 2268 N (pull is lower because the 25 mm rod reduces the piston area on the return side). The maximum operating pressure is 1.0 MPa, giving a theoretical push of 5026 N.
Yes, if the mounting style and port thread (PT) match. The SCJ80 body is slightly longer than the SC80 to house the adjusting screw, so check the 239 mm body length against your available space. You must also match the 300 mm nominal stroke and the magnet option (-S) if your existing setup uses sensors.
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