The AirTAC Airtac SCJ80 Standard Cylinder SCJ80X75-20STC 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, 75mm nominal stroke, PT3/8 ports and adjustable end cushioning.
The SCJ80X75-20STC is an 80 mm bore double-acting single-rod cylinder that lets you fine-tune the stroke end by up to 20 mm via a rear adjusting screw, without replacing the unit. With a 25 mm rod and a 2513 N push force at 0.5 MPa, it delivers robust linear motion for medium-duty automation tasks where the final stop position must be dialled in on the machine.
This model includes a built-in magnet for CMSG/DMSG/EMSG sensors and a centre trunnion (TC) mount, supplied with the TCM1 bracket, allowing the cylinder to pivot as it strokes. The SCJ body length A is 239 mm, and the adjustable air cushion decelerates the piston smoothly at the end of travel.
| Model | Airtac SCJ80 Standard Cylinder SCJ80X75-20STC |
|---|---|
| Series | SCJ adjustable-stroke tie-rod cylinder |
| Bore size | Ø80 mm |
| Nominal stroke | 75 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. |
| ×75 | 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 adjustment allows technicians to precisely set the retract end stop during initial machine commissioning, eliminating the need for trial-and-error cylinder swaps.
On a packaging line, quickly adjust the stroke end to accommodate different box sizes or product positions without mechanical rework, using the centre trunnion mount for a pivoting pusher arm.
In clamping or pressing fixtures, the adjustable stroke can be used to take up mechanical wear in tooling over time, maintaining consistent contact without reprogramming the machine controller.
Choose this 80 mm bore when the 63 mm bore's 1559 N push force at 0.5 MPa is marginal. If you need a fixed, non-adjustable stroke, the standard SC80X75 is the direct alternative. For replacement, match the 80 mm bore, 75 mm nominal stroke, 20 mm adjust range, PT port thread, TC centre trunnion mount (F-SC80TC), and the -S magnet option exactly.
For this 75 mm stroke, side-loading is not a primary concern, but if the application involves off-axis forces, consider an external guide rail or a guided cylinder to protect the rod bearing from premature wear.
Adjustable-stroke checklist
At the standard 0.5 MPa operating pressure, it delivers 2513 N of push force and 2268 N of pull force. The maximum push force at 0.9 MPa is 4523 N. The pull force is lower because the 25 mm rod reduces the effective piston area on the return stroke.
A rear-cap screw lets you shorten the stroke end by up to 20 mm from the 75 mm nominal maximum. It is a mechanical end-stop, not a force or speed control. Choose the SCJ over a fixed-stroke SC when you need to fine-tune the end position on-site. For replacement, you must match the SCJ series, bore, nominal stroke, 20 mm adjust range, and mounting type.
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