The AirTAC Airtac SCJ50 Standard Cylinder SCJ50X400-75 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. Ø50mm bore, 400mm nominal stroke, PT1/4 ports and adjustable end cushioning.
The SCJ50X400-75 is a double-acting, single-rod pneumatic cylinder that puts fine stroke-end tuning directly on the machine. Its rear-cap adjusting screw lets you shorten the stroke by up to 75 mm without swapping the cylinder, making it a practical choice for commissioning trials, format changeovers, or taking up mechanical wear. With a 50 mm bore, this unit delivers 982 N of push force at 0.5 MPa and 1767 N at the maximum operating pressure of 0.9 MPa.
This tie-rod cylinder uses a 20 mm diameter piston rod and PT1/4 ports, with an adjustable air cushion to decelerate the load smoothly. The body length A(SCJ) is 194 mm, and the standard stroke ceiling for the 50 mm bore is 1200 mm, so this 400 mm nominal stroke is well within the standard range. As a genuine AirTAC product, it is built for reliable service in filtered-air systems up to 1.0 MPa.
| Model | Airtac SCJ50 Standard Cylinder SCJ50X400-75 |
|---|---|
| Series | SCJ adjustable-stroke tie-rod cylinder |
| Bore size | Ø50 mm |
| Nominal stroke | 400 mm |
| Stroke adjustment | Up to 75 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. |
| ×400 | 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.
Fine-tune the end position of a material stop or pusher during machine commissioning. The 75 mm adjustment range allows operators to dial in the exact stroke without fabricating new hard stops.
Quickly adapt a diverter gate or sorting mechanism for different box sizes on a packaging line. The rear screw adjusts the stroke end in seconds, minimizing downtime between production runs.
Compensate for mechanical wear in a clamping or pressing fixture over time. As tooling surfaces wear down, the adjustable stroke can be extended slightly to maintain consistent clamping force and position.
Choose the SCJ50X400-75 when you need a mid-range force actuator with the ability to dial in the stroke end position on-site. If your application requires more push force, stepping up to the 63 mm bore (SCJ63) provides 1559 N at 0.5 MPa; for a lighter, more compact solution, the 40 mm bore (SCJ40) offers 628 N. If the stroke never needs adjustment, the fixed-stroke SC50X400 is a simpler, cost-effective alternative. For a direct replacement, match the 50 mm bore, 400 mm nominal stroke, 75 mm adjust range, PT port thread, basic mounting, and no magnet.
At a 400 mm stroke, the piston rod is extended significantly. Evaluate side-loading forces on the rod; if the load is not guided externally, consider adding an external guide rail or switching 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. At the maximum operating pressure of 0.9 MPa, the push force increases to 1767 N. The pull force is lower because the rod reduces the effective piston area on the return stroke.
A rear-cap adjusting screw sets the stroke end position within a 75 mm range, shortening the 400 mm nominal stroke. Choose the SCJ when you need to fine-tune the stroke on the machine for setup, changeovers, or wear compensation. If the stroke length is fixed and never needs field adjustment, the standard SC fixed-stroke cylinder is the more economical choice.
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