The AirTAC Airtac SCJ40 Standard Cylinder SCJ40X175-40 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. Ø40mm bore, 175mm nominal stroke, PT1/4 ports and adjustable end cushioning.
The SCJ40X175-40 is a double-acting, single-rod pneumatic cylinder with a field-adjustable stroke end, offering up to 40 mm of fine-tuning via a rear-cap screw. With a 40 mm bore and a 16 mm rod, it delivers 628 N of push force at 0.5 MPa, making it a versatile mid-range actuator for tasks that require on-machine stroke tweaking during commissioning or format changes.
This model features a 175 mm nominal stroke, PT1/4 ports, and an M12x1.25 rod thread, with a 21 mm air cushion for smooth deceleration. The body length (A dimension) is 185 mm, and the adjustable screw shortens the stroke end without disassembling the cylinder, eliminating the need for external hard stops.
| Model | Airtac SCJ40 Standard Cylinder SCJ40X175-40 |
|---|---|
| Series | SCJ adjustable-stroke tie-rod cylinder |
| Bore size | Ø40 mm |
| Nominal stroke | 175 mm |
| Stroke adjustment | Up to 40 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. |
| -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.
Fine-tune the end position of a material stop or pusher during machine commissioning without swapping out hard stops, saving setup time on a new packaging line.
Quickly adjust the stroke of a diverter gate on a conveyor to handle different box widths, using the 40 mm adjustment range to switch between product sizes in minutes.
In a clamping fixture, use the adjusting screw to take up mechanical wear on contact pads over time, maintaining consistent clamping pressure without replacing the cylinder.
Choose the SCJ40X175-40 when you need to dial in a precise stroke end position on the fly. For applications requiring more force, stepping up to a 50 mm bore SCJ provides 982 N of push at 0.5 MPa. If the stroke does not need field adjustment, a fixed-stroke SC40X175 simplifies the setup. A direct replacement must match the 40 mm bore, 175 mm nominal stroke, 40 mm adjustable range, PT port thread, and basic mounting. At this 175 mm stroke, ensure the rod is guided if significant side loads are present to prevent bending.
Adjustable-stroke checklist
At 0.5 MPa, the push force is 628 N and the pull force is 528 N. The maximum operating force at 0.9 MPa is 1130 N push. Because it is a single-rod cylinder, the push force is greater than the pull force due to the rod area on the return side.
Yes, if you need the adjustable stroke feature. The SCJ40X175-40 is a direct dimensional match for an SC40X175 in terms of bore, port, and mounting, but the body is slightly longer to house the adjusting screw. Ensure the 40 mm adjustment range does not interfere with your machine's cycle, and that the mounting style (basic, FA, LB, or TC) matches your existing setup.
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