The AirTAC Airtac SCJ50 Standard Cylinder SCJ50X300-10 is a genuine double-acting SINGLE-ROD air cylinder with a rear-cap ADJUSTING SCREW: the stroke end is field-adjustable within a 10 mm range without swapping the cylinder. Ø50mm bore, 300mm nominal stroke, PT1/4 ports and adjustable end cushioning.
The SCJ50X300-10 is a 50 mm bore double-acting, single-rod pneumatic cylinder with a 300 mm nominal stroke and a 10 mm rear-end adjustable range. At 0.5 MPa it delivers 982 N of push force and 825 N on the pull stroke, making it a capable mid-range actuator for tasks that need a modest but useful amount of end-position fine-tuning on the machine.
A 20 mm diameter piston rod and PT1/4 ports keep the unit mechanically robust, while the built-in adjustable air cushion (21 mm length) helps decelerate the load smoothly. The body length A dimension is 194 mm, and the rear adjusting screw lets you shorten the stroke end by up to 10 mm during commissioning or format changes, without needing to replace the cylinder or add external hard stops.
| Model | Airtac SCJ50 Standard Cylinder SCJ50X300-10 |
|---|---|
| Series | SCJ adjustable-stroke tie-rod cylinder |
| Bore size | Ø50 mm |
| Nominal stroke | 300 mm |
| Stroke adjustment | Up to 10 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. |
| ×300 | Nominal (maximum) stroke length in mm. |
| -10 | 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.
Use the 10 mm rear adjuster to quickly find the optimal stroke end position during machine commissioning. Eliminates the need to machine spacer blocks or swap cylinders for small positional tweaks.
Fine-tune the retracted position of a product stop or diverter gate on a conveyor line. The 10 mm range is ideal for accommodating slight variations in product size or wear on a contact tip.
Compensate for tooling or workpiece thickness changes in a clamping or light press operation. The adjusting screw lets you set the precise clamping point without reprogramming the machine controller.
Pick the SCJ50X300-10 when a 50 mm bore gives enough force but you need to dial in the exact stroke end position within a 10 mm window. If you require more push force, stepping up to a 63 mm bore (1559 N at 0.5 MPa) is the logical move; for a lighter, more compact solution, the 40 mm bore (628 N at 0.5 MPa) may suffice. For a fixed, non-adjustable stroke, the standard SC50X300 is a simpler alternative.
At 300 mm of stroke, be mindful of side loads that can cause rod bending. If the application imposes any lateral force, use an external guide rail or switch to a guided cylinder. For a direct replacement, match an SCJ50X300-10 with PT ports, basic mounting, and no magnet; if your current unit has a magnet, order SCJ50X300-10S, and for a centre-trunnion mount specify SCJ50X300-10TC.
Adjustable-stroke checklist
At the standard 0.5 MPa operating pressure, the cylinder provides 982 N of push force (extending) and 825 N of pull force (retracting). The maximum push force at 0.9 MPa is 1767 N. The pull force is lower because the 20 mm piston rod reduces the effective piston area on the return stroke.
A rear-cap adjusting screw lets you shorten the stroke end by up to 10 mm, giving you a field-adjustable range of 290-300 mm. It is a direct mechanical replacement for an SC50X300 if you need the adjustability, but the SCJ body is slightly longer. Ensure you match the port thread (PT), mounting style, and magnet option when ordering a replacement.
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