The AirTAC Airtac SCJ40 Standard Cylinder SCJ40X175-75 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. Ø40mm bore, 175mm nominal stroke, PT1/4 ports and adjustable end cushioning.
The SCJ40X175-75 brings field-adjustable stroke control to the 40 mm bore class, delivering 628 N of push force at 0.5 MPa and up to 1130 N at the 0.9 MPa maximum operating pressure. Its rear-cap adjusting screw provides a generous 75 mm of stroke-end reduction, letting you fine-tune the piston stop position without removing the cylinder from the machine.
This double-acting, single-rod cylinder uses a 16 mm diameter rod and PT1/4 ports, with a 21 mm air cushion at each end to decelerate the load smoothly. The tie-rod body measures 185 mm in length (A dimension), and the standard stroke of 175 mm is well within the 1200 mm maximum for this bore size.
| Model | Airtac SCJ40 Standard Cylinder SCJ40X175-75 |
|---|---|
| Series | SCJ adjustable-stroke tie-rod cylinder |
| Bore size | Ø40 mm |
| Nominal stroke | 175 mm |
| Stroke adjustment | Up to 75 mm (rear adjusting screw) |
| Acting type | Double acting (single rod) |
| Port size | PT1/4 |
| Rod thread | M12×1.25 |
| 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, 21 mm |
| Max stroke | Up to 1200 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 | 628 N | 528 N |
| 0.7 MPa | 880 N | — |
| Max (@1.0 MPa) | 128 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. |
|---|---|
| 40 | Bore size in mm. |
| ×175 | 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.
The 75 mm rear adjuster lets technicians precisely set the retract stroke end on a new assembly line without swapping shims or hard stops, speeding up machine runoff.
Packaging machines that handle multiple box sizes use the SCJ40X175-75 to quickly reset the pusher stroke between batches, minimizing downtime during product changeovers.
In clamping or pressing fixtures, the adjustable stroke can be tweaked over time to take up mechanical wear in tooling, maintaining consistent clamp force without replacing the cylinder.
Choose the SCJ40X175-75 when you need to dial in a precise stroke end during commissioning or product changeovers. If you require more force, stepping up to the 50 mm bore SCJ50 delivers 982 N of push at 0.5 MPa. For applications where the stroke is fixed and never needs field adjustment, the standard SC40 fixed-stroke cylinder is a simpler, cost-effective alternative. This model is a direct replacement for another AirTAC SCJ40X175-75 with the same 75 mm adjust range, PT ports, and basic mounting. For strokes of 300 mm or longer, evaluate side-loading on the 16 mm rod and consider an external guide or a guided cylinder to prevent bending.
Adjustable-stroke checklist
At 0.5 MPa, the push force is 628 N and the pull force is 528 N (the difference is due to the single 16 mm rod). At the maximum operating pressure of 0.9 MPa, the push force reaches 1130 N.
A screw in the rear cap limits how far the piston can retract. You can shorten the nominal 175 mm stroke by up to 75 mm. It only sets the stroke end position—it does not adjust the cylinder's speed or output force.
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