The AirTAC Airtac SCJ80 Standard Cylinder SCJ80X75-40S 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, 75mm nominal stroke, PT3/8 ports and adjustable end cushioning.
The SCJ80X75-40S is an 80 mm bore double-acting single-rod cylinder with a 75 mm nominal stroke and a 40 mm rear-end adjustable stroke range, letting you fine-tune the stroke end position on the machine without swapping the cylinder. It delivers 2513 N of push force and 2268 N of pull force at 0.5 MPa, driven through a 25 mm diameter piston rod and PT3/8 ports.
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 adjustable air cushion (28 mm long) decelerates the piston smoothly, and the body length A is 239 mm. It is a genuine AirTAC unit rated for 0.15–1.0 MPa and -20 to +70 °C with the standard TPU seal.
| Model | Airtac SCJ80 Standard Cylinder SCJ80X75-40S |
|---|---|
| Series | SCJ adjustable-stroke tie-rod cylinder |
| Bore size | Ø80 mm |
| Nominal stroke | 75 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. |
| ×75 | 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.
The 40 mm rear adjustment screw lets technicians precisely set the stroke end during initial machine setup, compensating for assembly tolerances without needing to re-machine mounting brackets or swap cylinders.
On packaging or sorting lines, operators can quickly re-set the stroke to match different box sizes or product widths, reducing downtime between batches with a simple screw adjustment.
In clamping or pressing fixtures, the adjustable stroke can be shortened over time to take up wear on tooling or contact pads, maintaining consistent clamp force and position without replacing the actuator.
Choose the SCJ80X75-40S when you need to dial in a precise stroke end during commissioning or format changes, with 2513 N of push force at 0.5 MPa. If you need more force, stepping up to the 100 mm bore provides 3927 N push; for a lighter, more compact solution, the 63 mm bore delivers 1559 N. The built-in magnet is already present, so sensor installation is immediate.
For fixed-stroke applications where adjustment is never needed, the standard SC80X75 is a simpler alternative. If the load creates significant side forces or the 75 mm stroke risks rod bending, add an external linear guide or consider a guided cylinder. This SCJ is a direct replacement for another AirTAC SCJ80 cylinder with the same 75 mm nominal stroke, 40 mm adjust range, PT ports, and -S magnet option.
Adjustable-stroke checklist
At 0.5 MPa the cylinder generates 2513 N pushing and 2268 N pulling. At the maximum operating pressure of 1.0 MPa, theoretical push force reaches 5026 N. The push force is higher than the pull force because the single 25 mm rod reduces the piston area on the return side.
Yes, if your existing cylinder is an AirTAC SCJ80 with a 75 mm nominal stroke, a 40 mm adjustable range, PT ports, and a built-in magnet. The SCJ is a tie-rod cylinder, so confirm the body length A (239 mm) and the mounting style match your machine. This model uses the basic mount; if you need a trunnion or foot mount, order the appropriate accessory bracket.
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