The AirTAC Airtac SCJ80 Standard Cylinder SCJ80X120-40S is a genuine double-acting SINGLE-ROD air cylinder with a rear-cap ADJUSTING SCREW: the stroke end is field-adjustable within a 40 mm range without swapping the cylinder. Ø80mm bore, 120mm nominal stroke, PT3/8 ports and adjustable end cushioning.
The SCJ80X120-40S is a double-acting, single-rod pneumatic cylinder with a field-adjustable stroke end, providing a 40 mm adjustment range via a rear-cap screw. With an 80 mm bore, it delivers 2513 N of push force at 0.5 MPa, making it a powerful actuator for industrial tasks that require fine-tuned positioning without swapping the cylinder. The built-in magnet allows direct mounting of CMSG/DMSG/EMSG sensors for reliable end-of-stroke detection.
This tie-rod cylinder uses a 25 mm diameter piston rod, PT3/8 ports, and an M20x1.5 rod thread for secure tooling attachment. The adjustable air cushion, with a 28 mm cushion length, decelerates the piston smoothly, while the screw sets the stroke end position to accommodate commissioning trials, format changes, or wear take-up. Its body length A(SCJ) is 239 mm, slightly longer than the fixed-stroke SC version to house the adjustment mechanism.
| Model | Airtac SCJ80 Standard Cylinder SCJ80X120-40S |
|---|---|
| Series | SCJ adjustable-stroke tie-rod cylinder |
| Bore size | Ø80 mm |
| Nominal stroke | 120 mm |
| Stroke adjustment | Up to 40 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. |
| ×120 | Nominal (maximum) stroke length in mm. |
| -40 | 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 40 mm stroke-end adjustment allows technicians to fine-tune the actuator's stop position on a new assembly line without mechanical rework, speeding up the commissioning process for packaging or material handling equipment.
In bottling or canning lines, the adjustable stroke quickly adapts the cylinder's end position to handle different container sizes, minimizing downtime during product changeovers.
In clamping or pressing fixtures, the screw can be periodically advanced to compensate for tooling or pad wear, maintaining consistent clamping force and part quality without replacing the cylinder.
Choose the SCJ80X120-40S when you need to precisely dial in a stroke end point within a 40 mm window without redesigning the machine. If your force requirement is lighter, the 63 mm bore SCJ63 series offers 1559 N of push force at 0.5 MPa; for heavier loads, step up to the SCJ100 series, which provides 3927 N. This model is ideal when the adjustable stroke is critical, but if your application has a fixed, unchanging stroke, the standard SC80 series is a more economical choice.
For replacement, match with an AirTAC SCJ adjustable-stroke cylinder of the same 80 mm bore, 120 mm nominal stroke, and 40 mm adjustment range (-40). Ensure the port thread is PT, the mounting is basic, and the magnet option (-S) is present for sensor compatibility. For strokes of 300 mm or more, be mindful of side-loading and rod bending; use an external guide or switch to a guided cylinder if lateral forces are present.
Adjustable-stroke checklist
At 0.5 MPa, the 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. The maximum operating push force at 0.9 MPa is 4523 N.
A rear adjusting screw sets the stroke end position, allowing you to shorten the effective stroke by up to 40 mm from the 120 mm nominal maximum. Choose this SCJ model when your process requires fine-tuning the stop point for setup, different product formats, or to take up wear. Choose a fixed-stroke SC80 cylinder if the stroke length is permanently fixed and you want a simpler, more cost-effective solution.
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