The AirTAC Airtac SCJ50 Standard Cylinder SCJ50X350-75S 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. Ø50mm bore, 350mm nominal stroke, PT1/4 ports and adjustable end cushioning.
The AirTAC SCJ50X350-75S is a double-acting, single-rod pneumatic cylinder with a field-adjustable stroke, delivering a push force of 982 N at 0.5 MPa. Its rear-cap adjusting screw provides up to 75 mm of stroke-end reduction, allowing precise fine-tuning of the piston's stop position without removing the cylinder from the machine. The 20 mm diameter piston rod and PT1/4 ports handle mid-range pneumatic tasks with a body length of 194 mm.
This model includes a built-in magnet (-S), enabling direct mounting of CMSG, DMSG, or EMSG reed and solid-state sensors along the tie-rod barrel for reliable end-of-stroke detection. The 350 mm nominal stroke is well within the 1200 mm maximum for the 50 mm bore, making it a standard, readily available configuration for commissioning and format-change applications.
| Model | Airtac SCJ50 Standard Cylinder SCJ50X350-75S |
|---|---|
| Series | SCJ adjustable-stroke tie-rod cylinder |
| Bore size | Ø50 mm |
| Nominal stroke | 350 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. |
| ×350 | 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.
During initial machine setup, the 75 mm adjustment range allows engineers to precisely dial in the optimal stroke end for a new process without needing to swap out fixed-stroke cylinders or fabricate external hard stops.
Ideal for conveyor lines handling different box or pallet sizes. The stroke can be quickly adjusted via the rear screw to change the gate's stopping position for each format, minimizing changeover time.
In a clamping fixture, the adjustable stroke compensates for wear on the clamp pads or variations in workpiece thickness, ensuring consistent clamping force is applied at the correct position over thousands of cycles.
Select the SCJ50X350-75S when you need mid-range force and a 75 mm on-machine adjustment window. If your force requirement is lower, stepping down to a 40 mm bore reduces push force to 628 N at 0.5 MPa; for higher force, a 63 mm bore provides 1559 N. Choose this adjustable-stroke SCJ over a fixed-stroke SC when your application demands fine end-position tuning for setup, wear compensation, or handling different product sizes. For a direct replacement, match the 50 mm bore, 350 mm nominal stroke, 75 mm adjust range, PT port thread, basic mounting, and the integrated magnet.
With a 350 mm stroke, be mindful of side-loading on the 20 mm rod. If the load is not guided externally, the rod may be subject to bending moments. In such cases, incorporate an external linear guide or consider a guided cylinder assembly to protect the rod bearings and seals from premature wear.
Adjustable-stroke checklist
As a single-rod cylinder, push and pull forces differ. At the standard 0.5 MPa operating pressure, the push force is 982 N and the pull force is 825 N. At the maximum operating pressure of 1.0 MPa, the theoretical push force reaches 200 kgf.
No. The rear adjusting screw only sets the stroke END position by limiting how far the piston can extend. It does not affect the retracted start position and is not a locking device. The cylinder will not hold a load if air pressure is lost; an external mechanical lock or pilot-operated check valve is required for load holding.
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