The AirTAC Airtac SCJ50 Standard Cylinder SCJ50X225-40S 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. Ø50mm bore, 225mm nominal stroke, PT1/4 ports and adjustable end cushioning.
The SCJ50X225-40S is a 50 mm bore double-acting single-rod cylinder with a rear-cap adjusting screw that provides a 40 mm field-adjustable stroke-end range. This allows fine-tuning of the 225 mm nominal stroke without removing the cylinder, delivering 982 N of push force at 0.5 MPa and up to 1767 N at 0.9 MPa. The 20 mm diameter piston rod and PT1/4 port thread make it a robust, mid-range actuator for dynamic applications.
A built-in magnet (denoted by the -S suffix) allows direct mounting of CMSG, DMSG, or EMSG reed and solid-state sensors along the tie-rod barrel for precise end-of-stroke or mid-stroke position feedback. The cylinder uses TPU seals for standard operation from -20 to +70 °C and features an adjustable air cushion to decelerate the piston smoothly at the end of travel.
| Model | Airtac SCJ50 Standard Cylinder SCJ50X225-40S |
|---|---|
| Series | SCJ adjustable-stroke tie-rod cylinder |
| Bore size | Ø50 mm |
| Nominal stroke | 225 mm |
| Stroke adjustment | Up to 40 mm (rear adjusting screw) |
| Acting type | Double acting (single rod) |
| Port size | PT1/4 |
| Rod thread | M16×1.5 |
| 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 | 982 N | 825 N |
| 0.7 MPa | 1374 N | — |
| Max (@1.0 MPa) | 200 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. |
|---|---|
| 50 | Bore size in mm. |
| ×225 | 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.
The 40 mm adjust range allows engineers to dial in the exact stroke end position during machine commissioning and fine-tune it for optimal performance without swapping out the cylinder.
In packaging or labeling lines, the stroke can be quickly adjusted to handle different product sizes or box formats, reducing downtime between production runs.
The rear screw can be used to take up mechanical play or compensate for wear in tooling over time, maintaining precise positioning without replacing the actuator.
This 50 mm bore model is a strong middle-ground choice, stepping up from the 40 mm bore (628 N push) for heavier loads, or down from the 63 mm bore (1559 N push) if space and air consumption are a concern. For applications that do not require field-adjustable stroke, the fixed-stroke SC50X225 offers a simpler, more compact alternative. If the load has a significant side force, especially at this 225 mm stroke, an external guide rail or a guided cylinder should be used to prevent rod bending.
For a direct replacement, match an AirTAC SCJ cylinder with a 50 mm bore, 225 mm nominal stroke, 40 mm adjust range, PT port thread, basic mounting, and a built-in magnet. The standard SCJ mounting accessories for this bore are FA (front flange, F-SC50FA), LB (foot mount, F-SC50LB), and TC (center trunnion with TCM1 bracket, F-SC50TC).
Adjustable-stroke checklist
At 0.5 MPa, the push force is 982 N and the pull force is 825 N. The maximum push force at the 0.9 MPa operating limit is 1767 N. Because it is a single-rod cylinder, the push force is greater than the pull force due to the rod area.
A screw in the rear cap acts as an internal stop for the piston, allowing you to shorten the stroke end by up to 40 mm. This sets the final extended position of the rod. It is not a speed or force control; it only adjusts the mechanical end-of-stroke position.
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