The AirTAC Airtac SCJ100 Standard Cylinder SCJ100X420-75S is a genuine double-acting SINGLE-ROD air cylinder with a rear-cap ADJUSTING SCREW: the stroke end is field-adjustable within a 75 mm range without swapping the cylinder. Ø100mm bore, 420mm nominal stroke, PT1/2 ports and adjustable end cushioning.
The SCJ100X420-75S delivers a substantial 3927 N push force at 0.5 MPa, making it a robust solution for heavy-duty applications requiring a long, tunable stroke. Its 75 mm rear-end adjustment range lets you dial in the exact stroke end position on the machine, accommodating part variations or wear without swapping the cylinder.
This model features a built-in magnet for direct mounting of CMSG/DMSG/EMSG sensors, enabling precise end-of-stroke or mid-stroke position feedback. The 25 mm diameter rod and PT1/2 ports ensure high flow and structural rigidity for a 420 mm nominal stroke, while the integrated air cushion smoothly decelerates the piston over its final 29 mm of travel.
| Model | Airtac SCJ100 Standard Cylinder SCJ100X420-75S |
|---|---|
| Series | SCJ adjustable-stroke tie-rod cylinder |
| Bore size | Ø100 mm |
| Nominal stroke | 420 mm |
| Stroke adjustment | Up to 75 mm (rear adjusting screw) |
| Acting type | Double acting (single rod) |
| Port size | PT1/2 |
| 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, 29 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 | 3927 N | 3682 N |
| 0.7 MPa | 5498 N | — |
| Max (@1.0 MPa) | 801 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. |
|---|---|
| 100 | Bore size in mm. |
| ×420 | Nominal (maximum) stroke length in mm. |
| -75 | 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.
Quickly adjust the push stroke for different box or pallet sizes on a packaging line without mechanical rework, minimizing downtime between product runs.
In high-cycle clamping or pressing fixtures, use the 75 mm adjustment screw to take up slack as tooling or contact surfaces wear, maintaining consistent clamp force.
Fine-tune the actuator's end stop during machine setup and testing to find the optimal stroke length for a new process, then lock it in place for production.
Choose the SCJ100 when you need a force class of around 3927 N push at standard plant pressure. If your load demands more, stepping up to the 125 mm bore provides 6136 N push at the same 0.5 MPa. For applications where the stroke never needs field adjustment, the fixed-stroke SC100 is a more economical alternative. If side-loading is a concern with this 420 mm stroke, an external guide rail or a guided cylinder is recommended to protect the rod and seals from bending moments.
This unit is a direct, form-fit replacement for another AirTAC SCJ100 cylinder with a 420 mm nominal stroke and a 75 mm adjust range, provided the port thread (PT) and magnet option (S) match. For a pivoting mount, order the TC center trunnion kit (F-SC100TC).
Adjustable-stroke checklist
At 0.5 MPa, the push force is 3927 N and the pull force is 3681 N. The maximum push force at the 0.9 MPa operating limit is 7068 N. The pull force is lower due to the area of the 25 mm piston rod.
Yes. The '-S' in the model code signifies a built-in magnet, making it ready for AirTAC CMSG, DMSG, or EMSG reed and solid-state sensors. These sensors clamp directly onto the cylinder barrel's tie-rod slots to detect piston position.
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