The AirTAC Airtac SCJ80 Standard Cylinder SCJ80X125-30S is a genuine double-acting SINGLE-ROD air cylinder with a rear-cap ADJUSTING SCREW: the stroke end is field-adjustable within a 30 mm range without swapping the cylinder. Ø80mm bore, 125mm nominal stroke, PT3/8 ports and adjustable end cushioning.
The SCJ80X125-30S is an 80 mm bore double-acting single-rod cylinder with a rear adjusting screw that provides 30 mm of field-adjustable stroke-end control, letting you fine-tune the 125 mm nominal stroke without swapping the unit. At 0.5 MPa it delivers 2513 N push and 2268 N pull, and the 25 mm rod with PT3/8 ports handles a wide range of pneumatic positioning tasks.
This model includes a built-in magnet (-S), so CMSG/DMSG/EMSG reed or solid-state sensors clamp directly onto the tie-rod barrel for reliable end-of-stroke detection. The body length A(SCJ) is 239 mm, and the adjustable air cushion decelerates the piston smoothly at both ends. It is a genuine AirTAC component built for repeatable commissioning and changeover adjustments.
| Model | Airtac SCJ80 Standard Cylinder SCJ80X125-30S |
|---|---|
| Series | SCJ adjustable-stroke tie-rod cylinder |
| Bore size | Ø80 mm |
| Nominal stroke | 125 mm |
| Stroke adjustment | Up to 30 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. |
| ×125 | Nominal (maximum) stroke length in mm. |
| -30 | 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.
Packaging or labelling machines that switch between product sizes use the 30 mm adjust range to quickly set a new end-stop position without mechanical rework, cutting downtime between batches.
During machine build and commissioning, the rear screw allows engineers to precisely dial in the actuator stroke to match the actual tooling and fixture positions, compensating for build tolerances.
In clamping or pressing fixtures where tooling surfaces wear over time, the adjustable stroke-end screw can be periodically advanced to maintain consistent clamp force and position without replacing the cylinder.
Choose the SCJ80X125-30S when you need mid-range force and the ability to dial in the stroke end on the machine. If 2513 N push at 0.5 MPa is marginal, stepping up to the 100 mm bore gives 3927 N push; if you need a lighter, more compact unit, the 63 mm bore provides 1559 N. For applications where the stroke never needs field adjustment, the fixed-stroke SC80X125 is a simpler, slightly shorter alternative.
A direct replacement must match the 80 mm bore, 125 mm nominal stroke, 30 mm adjust range, PT ports, and the built-in magnet. The SCJ mounting subset includes basic, FA front flange, LB foot, and TC centre trunnion with TCM1 bracket—no FB flange or CA/CB clevis mounts are available. For a 125 mm stroke, rod bending is not a primary concern, but if the load applies a significant side force, consider an external guide rail.
Adjustable-stroke checklist
At the standard 0.5 MPa operating pressure, this 80 mm bore cylinder produces 2513 N of push force and 2268 N of pull force. The push force is higher because the single rod reduces the effective piston area on the return stroke. Maximum push force at 0.9 MPa is 4523 N.
Only if your application can accommodate the slightly longer body length A(SCJ) of 239 mm and you need the 30 mm adjustable stroke-end feature. The SCJ is not a direct dimensional drop-in for a fixed-stroke SC of the same nominal stroke. Ensure the port size (PT3/8), mounting style, and magnet option match your existing setup.
Genuine AirTAC parts produced by AirTAC factory.
Covers non-human-caused product damage.
Standard models usually ship in 3-4 days.
Most inquiries answered within 7-8 hours.
Send us the quantity and destination. We confirm price, stock and lead time — usually within 7-8 hours.