Airtac SCJ50 Standard Cylinder SCJ50X450-75
The AirTAC Airtac SCJ50 Standard Cylinder SCJ50X450-75 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, 450mm nominal stroke, PT1/4 ports and adjustable end cushioning.
- BoreØ50 mm
- Nominal stroke450 mm
- Stroke adjust-75 mm
- Port sizePT1/4
- Rod threadM16×1.5
- CushionAdjustable, 21 mm
About the Airtac SCJ50 Standard Cylinder SCJ50X450-75
The SCJ50X450-75 is a double-acting, single-rod adjustable-stroke cylinder that delivers 982 N of push force at 0.5 MPa (1767 N at the 0.9 MPa maximum operating pressure). Its 75 mm rear-end adjustment screw lets you fine-tune the stroke end position in the field, making it ideal for commissioning and format changeovers on medium-duty automation.
This 50 mm bore model uses a 20 mm diameter piston rod with an M16x1.5 rod thread and PT1/4 ports. The integrated air cushion provides 21 mm of deceleration at each end, and the body length (A dimension) is 194 mm, providing a compact yet robust package for industrial tasks.
Airtac SCJ50 Standard Cylinder SCJ50X450-75 Technical Specifications
| Model | Airtac SCJ50 Standard Cylinder SCJ50X450-75 |
|---|---|
| Series | SCJ adjustable-stroke tie-rod cylinder |
| Bore size | Ø50 mm |
| Nominal stroke | 450 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.
Theoretical Output Force (Ø50mm)
| 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.
Model Code: Airtac SCJ50 Standard Cylinder SCJ50X450-75
| SCJ | Adjustable-stroke tie-rod cylinder series. |
|---|---|
| 50 | Bore size in mm. |
| ×450 | 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.
Where the Airtac SCJ50 Standard Cylinder SCJ50X450-75 Is Used
Commissioning & Setup
The 75 mm adjustment range allows technicians to quickly dial in the exact end-stop position during machine commissioning without fabricating custom hard stops.
Product Format Changeover
Easily adapt the cylinder's stroke for different product sizes on a packaging line by turning the rear screw, minimizing downtime between batches.
Wear Compensation
As tooling or gripper pads wear over time, the adjustable stroke can be extended slightly to maintain precise engagement without immediate part replacement.
Is the Airtac SCJ50 Standard Cylinder SCJ50X450-75 the Right Cylinder?
Choose the SCJ50X450-75 when you need a 450 mm nominal stroke with the ability to dial back the end position by up to 75 mm without replacing the cylinder. If your force requirement is lower, stepping down to the 40 mm bore reduces push force to 628 N at 0.5 MPa; for higher demands, the 63 mm bore provides 1559 N. For a direct replacement, match this model's 50 mm bore, 450 mm stroke, 75 mm adjustment range, PT port thread, and basic mounting style. Since this is a 450 mm stroke, ensure the rod is guided externally or use a guided cylinder if the application imposes significant side loads to prevent rod bending.
Adjustable-stroke checklist
- ✓ Need to fine-tune stroke on the line?
- ✓ Nominal stroke + adjust range (-75)
- ✓ Required force at your working pressure
- ✓ Port/thread type (PT/NPT/G)
- ✓ Magnet (-S) for sensors?
Installation & Maintenance Notes
- check Use clean air filtered to 40µm or finer.
- check Keep within 0.15 – 1.0 MPa operating pressure.
- check Set the rear adjusting screw, then lock it before running.
- check Adjust end cushion screws for smooth stops.
- check Use SCJ mounting accessory (FA / LB / TC / TCM1).
- check Installation by qualified personnel per AirTAC docs.
Airtac SCJ50 Standard Cylinder SCJ50X450-75 FAQ
At the standard 0.5 MPa operating pressure, the cylinder provides 982 N of push force and 825 N of pull force. The maximum push force at 0.9 MPa is 1767 N. The rear adjusting screw changes only the stroke end position, not the cylinder's force output.
It can replace an SC50 of a similar stroke if you need the field-adjustable end position. Ensure the replacement matches the 50 mm bore, PT1/4 ports, and your required mounting accessory. The SCJ body is slightly longer than a fixed-stroke SC to accommodate the adjustment mechanism.
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