The AirTAC Airtac SCJ80 Standard Cylinder SCJ80X250-100S 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, 250mm nominal stroke, PT3/8 ports and adjustable end cushioning.
The SCJ80X250-100S is a double-acting, single-rod pneumatic cylinder that puts fine stroke control at your fingertips. With a 100 mm rear adjusting screw, you can dial in the exact stroke end position on the fly—no need to swap cylinders or add external hard stops during commissioning or format changes. The 80 mm bore delivers a substantial 2513 N push force at 0.5 MPa, making it a workhorse for medium-to-heavy linear tasks.
The built-in magnet (denoted by the -S suffix) allows direct mounting of CMSG, DMSG, or EMSG sensors on the tie-rod barrel for reliable end-of-stroke detection. This model uses a 25 mm diameter piston rod, PT3/8 ports, and an M20x1.5 rod thread. Its 28 mm air cushion provides smooth deceleration, and the body length A(SCJ) is 239 mm, slightly longer than the fixed-stroke SC to accommodate the adjusting mechanism.
| Model | Airtac SCJ80 Standard Cylinder SCJ80X250-100S |
|---|---|
| Series | SCJ adjustable-stroke tie-rod cylinder |
| Bore size | Ø80 mm |
| Nominal stroke | 250 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. |
| ×250 | 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.
Field technicians can fine-tune the stroke end in seconds using the rear screw, eliminating the need to stock multiple fixed-stroke cylinders for trial-and-error machine setup.
On packaging or sorting lines, quickly adjust the pusher stroke to handle different box sizes or product widths without mechanical rework, minimizing downtime between batches.
In clamping or pressing fixtures, the adjustable stroke can take up for tooling wear or material thickness variations over time, maintaining consistent contact force without reprogramming the PLC.
Choose the SCJ80 bore when your application needs around 2500 N of push force at standard shop air. If you require more force, stepping up to the 100 mm bore provides 3927 N push at 0.5 MPa; for a lighter, more compact solution, the 63 mm bore delivers 1559 N. The 100 mm adjustment range on this model is ideal for processes where the stroke length needs frequent, precise tweaking. If your stroke is permanently fixed, the standard SC series offers a simpler, cost-effective alternative.
For replacement, match an AirTAC SCJ adjustable-stroke cylinder with an 80 mm bore, 250 mm nominal stroke, and a 100 mm adjustment range (-100). Ensure the port thread is PT, the magnet option (-S) is present for sensor compatibility, and the mounting style is basic. At this 250 mm stroke, the rod is well-supported, but for applications with significant side loads, consider adding an external linear guide or switching to a guided cylinder to prevent rod bending and premature seal wear.
Adjustable-stroke checklist
A screw in the rear cap acts as an adjustable end stop for the piston. Turning the screw changes the retracted position of the piston rod, allowing you to shorten the effective stroke by up to 100 mm from the nominal 250 mm maximum. It adjusts the stroke end only; it does not change the cylinder's force or speed.
At 0.5 MPa (roughly 73 psi), the push force is 2513 N and the pull force is 2268 N. The push force is higher because the rod reduces the effective piston area on the return side. The maximum push force at the 0.9 MPa operating limit is 4523 N.
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