The AirTAC Airtac SCJ40 Standard Cylinder SCJ40X450-30STC 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. Ø40mm bore, 450mm nominal stroke, PT1/4 ports and adjustable end cushioning.
The SCJ40X450-30STC is a double-acting, single-rod pneumatic cylinder with a field-adjustable stroke end, offering 628 N of push force at 0.5 MPa. Its rear-cap adjusting screw provides up to 30 mm of stroke-end reduction, making it ideal for commissioning fine-tuning and format changeovers on packaging or assembly lines without swapping the cylinder.
This model features a built-in magnet for CMSG/DMSG sensor compatibility and a centre trunnion (TC) mount for pivoting applications. The 40 mm bore uses a 16 mm diameter piston rod and PT1/4 ports, with an adjustable air cushion for smooth deceleration. The body length A(SCJ) is 185 mm, slightly longer than a fixed-stroke SC due to the integrated adjusting mechanism.
| Model | Airtac SCJ40 Standard Cylinder SCJ40X450-30STC |
|---|---|
| Series | SCJ adjustable-stroke tie-rod cylinder |
| Bore size | Ø40 mm |
| Nominal stroke | 450 mm |
| Stroke adjustment | Up to 30 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. |
| ×450 | 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.
Engineers use the 30 mm adjusting screw to fine-tune the end-stop position during machine commissioning, eliminating the need to fabricate custom shims or mechanical stops for a perfect fit.
On a packaging line, the adjustable stroke allows operators to quickly reset the pusher stroke for a new box size by simply turning the rear screw, minimizing downtime between production runs.
In clamping or pressing fixtures, the stroke can be incrementally extended over time to compensate for wear on tooling or contact surfaces, maintaining consistent clamping force without replacing the actuator.
Choose the SCJ40X450-30STC when you need to precisely dial in the stroke end position on a machine, such as during a new product setup or to compensate for mechanical wear. If your force requirements increase, stepping up to a 50 mm bore SCJ provides 982 N of push force at the same 0.5 MPa pressure. For applications where the stroke is fixed and will never need adjustment, a standard SC40X450 cylinder is a simpler, more cost-effective alternative.
This cylinder is a direct replacement for another AirTAC SCJ40 cylinder with a 450 mm nominal stroke, 30 mm adjust range, PT ports, and TC mount with magnet. For this 450 mm stroke length, be mindful of side-loading on the 16 mm 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, this cylinder provides a push force of 628 N and a pull force of 528 N. The push force is greater because the single rod reduces the piston area on the return stroke. The maximum operating push force at 0.9 MPa is 1130 N.
A rear-cap adjusting screw lets you shorten the stroke end by up to 30 mm without disassembling the cylinder. Choose an SCJ when your application requires on-machine stroke fine-tuning for setup, changeover, or wear take-up. If the stroke is a fixed value that will never change, a standard SC fixed-stroke cylinder is the better choice.
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