The AirTAC Airtac SCJ40 Standard Cylinder SCJ40X200-75S 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. Ø40mm bore, 200mm nominal stroke, PT1/4 ports and adjustable end cushioning.
The SCJ40X200-75S is a double-acting, single-rod pneumatic cylinder engineered for applications requiring on-the-fly stroke-end adjustment. With a 40 mm bore and a nominal 200 mm stroke, the rear-cap screw provides a 75 mm adjustable range, allowing operators to fine-tune the end position without removing the cylinder. It delivers a push force of 628 N at 0.5 MPa and 1130 N at 0.9 MPa, making it a capable mid-range actuator.
This model features a built-in magnet (denoted by the -S suffix), enabling direct mounting of CMSG, DMSG, or EMSG reed and solid-state sensors along the barrel for precise end-of-stroke detection. The cylinder uses a 16 mm diameter piston rod with an M12x1.25 thread and PT1/4 ports. Its tie-rod construction ensures reliable service, with an adjustable air cushion for smooth deceleration and a body length of 185 mm.
| Model | Airtac SCJ40 Standard Cylinder SCJ40X200-75S |
|---|---|
| Series | SCJ adjustable-stroke tie-rod cylinder |
| Bore size | Ø40 mm |
| Nominal stroke | 200 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. |
| ×200 | 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 screw lets technicians dial in the exact stroke end-stop during initial machine setup, compensating for assembly tolerances without needing to swap out the cylinder or add external hard stops.
On packaging lines, quickly adjust the pusher stroke for different box sizes. The SCJ40X200-75S provides a 200 mm maximum reach, adjustable down to 125 mm, enabling a single actuator to handle multiple product formats.
In clamping or pressing fixtures, the adjustable stroke can be periodically tweaked to take up for pad wear or material thickness variations, maintaining consistent clamping force without reprogramming a controller.
Select the SCJ40X200-75S when you need a 200 mm maximum stroke that can be shortened by up to 75 mm during commissioning or changeovers. If your force requirements are lower, consider stepping down to the 32 mm bore (402 N push at 0.5 MPa); for significantly higher force, the 50 mm bore provides 982 N push. If your application does not require stroke adjustability, a fixed-stroke SC40X200 cylinder is a simpler, more cost-effective alternative.
For a drop-in replacement, match the 40 mm bore, 200 mm nominal stroke, 75 mm adjust range, PT1/4 port thread, and the built-in magnet. This basic-mount model requires a separate mounting bracket; choose from the FA front flange or LB foot mount (e.g., F-SC40LB). For strokes of this length, ensure the rod is not subjected to high side loads, or use an external guide rail 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 push force at the 0.9 MPa operating limit is 1130 N. The pull force is lower because the rod reduces the effective piston area on the retract side.
A rear-cap screw physically limits the piston's stroke end, allowing you to shorten the 200 mm nominal stroke by up to 75 mm. This is a mechanical end-stop, not a locking device. If air pressure is lost, the piston rod will not hold its position and can be moved by an external load; a pilot-operated check valve or external rod lock is required for load holding.
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