The AirTAC Airtac SCJ40 Standard Cylinder SCJ40X270-75 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, 270mm nominal stroke, PT1/4 ports and adjustable end cushioning.
The SCJ40X270-75 is a 40 mm bore double-acting, single-rod cylinder with a rear adjusting screw that provides up to 75 mm of field-adjustable stroke reduction. This allows machine builders to fine-tune the end position for commissioning, format changes, or wear compensation without removing the cylinder. At 0.5 MPa it delivers 628 N of push force and 528 N on the pull stroke, with a 16 mm diameter piston rod and PT1/4 pneumatic ports.
With a 270 mm nominal stroke, this unit is well within the 1200 mm maximum standard stroke for the 40 mm bore. The body length A(SCJ) is 185 mm, and the adjustable air cushion provides smooth deceleration. The standard TPU seal and PT thread configuration suits general industrial use from -20 to +70 °C.
| Model | Airtac SCJ40 Standard Cylinder SCJ40X270-75 |
|---|---|
| Series | SCJ adjustable-stroke tie-rod cylinder |
| Bore size | Ø40 mm |
| Nominal stroke | 270 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. |
| ×270 | 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 adjustment range lets technicians quickly dial in the exact end-of-stroke position during machine commissioning without fabricating custom hard stops.
On packaging or assembly lines, operators can adjust the stroke end to handle different product sizes or pallet depths, reducing changeover time between batches.
In clamping or pressing fixtures, the screw can be advanced over time to compensate for tooling or pad wear, maintaining consistent clamping force without replacing the actuator.
Choose the SCJ40X270-75 when you need to dial in the stroke end position on a 40 mm bore platform. If 628 N of push force at 0.5 MPa is insufficient, stepping up to a 50 mm bore SCJ50 series provides 982 N of push force. For applications requiring a fixed, non-adjustable stroke, the standard SC40 series is a simpler, more cost-effective alternative.
A direct replacement must match the 40 mm bore, 270 mm nominal stroke, 75 mm adjustment range, PT1/4 port thread, and basic mounting. For strokes of 270 mm and above, be mindful of side-loading on the rod; if the load is not guided, consider adding an external guide rail or switching to a guided cylinder to prevent rod bending and premature seal wear.
Adjustable-stroke checklist
At the standard operating pressure of 0.5 MPa, the cylinder produces 628 N of push force and 528 N of pull force. The maximum push force at 0.9 MPa is 1130 N. Because it is a single-rod cylinder, the push force is always greater than the pull force due to the area of the 16 mm rod.
A rear-cap adjusting screw lets you shorten the stroke end by up to 75 mm from the 270 mm nominal maximum. This is purely a mechanical stroke-end limiter, not a speed or force control. Choose the SCJ when you need to fine-tune the position in the field; choose a fixed-stroke SC when the stroke length is permanently defined and will never need adjustment.
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