The AirTAC Airtac SCJ80 Standard Cylinder SCJ80X275-20 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, 275mm nominal stroke, PT3/8 ports and adjustable end cushioning.
The SCJ80X275-20 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 20 mm, giving you a 255–275 mm working range without swapping the cylinder. At 0.5 MPa, it delivers 2513 N of push force and 2268 N of pull force, making it a strong choice for medium-duty positioning tasks.
This model uses a 25 mm diameter piston rod and PT3/8 ports. The built-in adjustable air cushion (28 mm long) decelerates the piston smoothly, and the tie-rod construction keeps service straightforward. The SCJ body length A is 239 mm, providing a compact footprint for its force class.
| Model | Airtac SCJ80 Standard Cylinder SCJ80X275-20 |
|---|---|
| Series | SCJ adjustable-stroke tie-rod cylinder |
| Bore size | Ø80 mm |
| Nominal stroke | 275 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. |
| ×275 | 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.
Fine-tune the end position during machine commissioning without re-plumbing. The 20 mm adjustment screw lets technicians dial in the exact stroke for sensors, clamps, or ejectors on the fly.
Quickly adapt to different product sizes on packaging or sorting lines. Adjust the stroke end to handle varying box heights or pallet widths without mechanical rework.
Take up mechanical play in linkages or tooling over time. The rear screw provides a simple way to restore precise end-of-stroke positioning as grippers or stops wear in.
Step up to the 100 mm bore SCJ if your load exceeds the 80 mm bore's 2513 N push force at 0.5 MPa; the 100 mm bore delivers 3927 N. For a simpler, fixed-stroke solution where no in-field adjustment is needed, the standard SC80X275 is a direct alternative. When replacing this cylinder, match the 80 mm bore, 275 mm nominal stroke, 20 mm adjust range, PT3/8 port thread, and basic mounting style.
At a 275 mm stroke, the extended rod can experience side-loading. If your application involves off-axis forces, consider pairing the cylinder with an external linear guide or switching to a guided cylinder to protect the rod and bearing from premature wear.
Adjustable-stroke checklist
At 0.5 MPa, the cylinder provides 2513 N pushing and 2268 N pulling. The push force is higher because the single rod reduces the piston area on the pull side. At the maximum operating pressure of 1.0 MPa, the theoretical push force reaches 513 kgf.
A screw in the rear cap acts as an internal stop for the piston, allowing you to shorten the stroke end by up to 20 mm. This field adjustment changes the rod's extended position without affecting the cylinder's bore, force output, or the 275 mm nominal maximum stroke rating.
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