The AirTAC Airtac SCJ50 Standard Cylinder SCJ50X350-20 is a genuine double-acting SINGLE-ROD air cylinder with a rear-cap ADJUSTING SCREW: the stroke end is field-adjustable within a 20 mm range without swapping the cylinder. Ø50mm bore, 350mm nominal stroke, PT1/4 ports and adjustable end cushioning.
The SCJ50X350-20 brings field-adjustable stroke control to a 50 mm bore double-acting cylinder. Its rear-cap screw provides up to 20 mm of stroke-end reduction, letting you dial in the exact stopping position without swapping the unit. With a 20 mm diameter piston rod and PT1/4 ports, it delivers 982 N of push force at 0.5 MPa and can reach 1767 N at the 0.9 MPa maximum operating pressure.
This tie-rod cylinder uses an adjustable air cushion (21 mm length) to decelerate the piston smoothly. The body length A is 194 mm plus stroke, making it a compact choice for applications where the stroke must be tuned during commissioning or format changes. It is not an ISO 15552 cylinder, so dimensional interchangeability is limited to matching AirTAC SCJ models.
| Model | Airtac SCJ50 Standard Cylinder SCJ50X350-20 |
|---|---|
| Series | SCJ adjustable-stroke tie-rod cylinder |
| Bore size | Ø50 mm |
| Nominal stroke | 350 mm |
| Stroke adjustment | Up to 20 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. |
| ×350 | Nominal (maximum) stroke length in mm. |
| -20 | 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.
Dial in the exact stroke end position during machine bring-up. The 20 mm rear screw adjustment lets technicians fine-tune the actuator's stopping point without disconnecting linkages or re-machining hard stops.
Quickly adapt a packaging or assembly line to a new product size. The adjustable stroke allows operators to shift the end-of-travel for different box heights or part lengths, reducing downtime between batches.
Take up mechanical play or seal compression over time. As tooling wears, the stroke can be extended slightly via the rear screw to maintain precise contact or clamping force, extending the service life of the entire station.
Choose the SCJ50 when you need a mid-range force of 982 N push at 0.5 MPa. If your load is lighter, stepping down to a 40 mm bore reduces push force to 628 N and saves space. For heavier demands, the 63 mm bore provides 1559 N. This model is ideal when the stroke needs frequent on-machine adjustment; if your stroke is fixed, a standard SC series cylinder is a simpler, lower-cost alternative. For a direct replacement, match the 50 mm bore, 350 mm nominal stroke, 20 mm adjust range, PT port thread, and basic mounting.
With a 350 mm stroke, consider the rod's column strength under compressive loads. If the application introduces significant side forces or the rod is unsupported, add an external linear guide or switch to a guided cylinder to prevent rod bending and premature seal wear.
Adjustable-stroke checklist
At 0.5 MPa, the push force is 982 N and the pull force is 825 N (the difference is due to the single 20 mm rod). At the maximum operating pressure of 0.9 MPa, push force reaches 1767 N. The rear adjusting screw does not alter the cylinder's force output; it only sets the stroke end position.
Yes, if you need the ability to fine-tune the stroke end. The SCJ50X350-20 shares the same 50 mm bore, PT1/4 ports, and basic tie-rod mounting pattern as a fixed-stroke SC50. Ensure the 20 mm adjustment range is sufficient for your application and that the slightly longer body length A (194 mm + stroke) fits your machine envelope.
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