The AirTAC Airtac SCJ80 Standard Cylinder SCJ80X275-50 is a genuine double-acting SINGLE-ROD air cylinder with a rear-cap ADJUSTING SCREW: the stroke end is field-adjustable within a 50 mm range without swapping the cylinder. Ø80mm bore, 275mm nominal stroke, PT3/8 ports and adjustable end cushioning.
The SCJ80X275-50 is an 80 mm bore, double-acting, single-rod pneumatic cylinder with a field-adjustable stroke. A rear-cap adjusting screw lets you shorten the stroke end by up to 50 mm, so the effective stroke can be dialed anywhere between 225 mm and the 275 mm nominal maximum. This makes it ideal for commissioning trials, format changeovers, or taking up mechanical wear without replacing the cylinder or adding external hard stops. The 25 mm piston rod and PT3/8 ports deliver a robust 2513 N push force at 0.5 MPa.
At 0.9 MPa maximum operating pressure, this cylinder generates 4523 N of push force, placing it in a high-force class for medium-duty automation. The body length A(SCJ) is 239 mm, and the adjustable air cushion decelerates the piston smoothly at end of travel. The stroke is within the 1500 mm maximum standard stroke for this bore, so it is a standard catalog item. This model comes in the basic configuration with TPU seals and PT threads, ready for direct integration or for adding an SCJ-specific mounting accessory like an LB foot or TC centre trunnion.
| Model | Airtac SCJ80 Standard Cylinder SCJ80X275-50 |
|---|---|
| Series | SCJ adjustable-stroke tie-rod cylinder |
| Bore size | Ø80 mm |
| Nominal stroke | 275 mm |
| Stroke adjustment | Up to 50 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. |
| ×275 | Nominal (maximum) stroke length in mm. |
| -50 | 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 50 mm adjustment range allows engineers to precisely dial in the optimal stroke end position for a new tool or fixture without needing to order multiple fixed-stroke cylinders.
On packaging or sorting lines, the adjustable stroke lets operators quickly reset a pusher or stop gate for a different product size. The 2513 N push force at 0.5 MPa handles heavy cartons or bins reliably.
In clamping or pressing operations, the stroke can be gradually extended over the cylinder's service life to compensate for wear on tooling or contact surfaces, maintaining consistent clamping force without mechanical shims.
Choose the SCJ80X275-50 when you need to fine-tune the stroke end position on the machine without swapping cylinders. If your force requirement is lower, stepping down to a 63 mm bore (1559 N push at 0.5 MPa) saves space and air consumption; if you need more force, the 100 mm bore provides 3927 N push at 0.5 MPa. For applications where the stroke must never be field-adjusted and a fixed hard stop is preferred, the standard SC80X275 fixed-stroke cylinder is a simpler, more cost-effective alternative.
For a direct replacement, match the 80 mm bore, 275 mm nominal stroke, and the 50 mm adjustable range. Ensure the port thread (PT), mounting style, and magnet option match the original. This is a basic configuration without a magnet or mounting bracket. For a 275 mm stroke, be mindful of side loads on the 25 mm rod; if the load is not guided externally, consider adding an external guide rail or switching to a guided cylinder to prevent rod bending and premature seal wear.
Adjustable-stroke checklist
At 0.5 MPa, the push force is 2513 N and the pull force is 2268 N. Because it is a single-rod cylinder, the pull force is lower due to the rod area. At the maximum operating pressure of 0.9 MPa, the push force reaches 4523 N.
It is a direct fit for any AirTAC SCJ80X275-50 with the same port thread (PT), basic mounting, and no magnet. If your original has a magnet, mounting bracket, or different seal material, you must match those suffix options exactly to ensure mechanical and sensor compatibility.
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