Airtac SCJ50 Standard Cylinder SCJ50X450-75S
The AirTAC Airtac SCJ50 Standard Cylinder SCJ50X450-75S 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, 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 SCJ50X450-75S
The SCJ50X450-75S is a double-acting, single-rod pneumatic cylinder offering a field-adjustable stroke end. Its rear-cap screw provides a 75 mm adjustment range, letting you fine-tune the 450 mm nominal stroke for commissioning or format changes without removing the cylinder. At 0.5 MPa, it delivers 982 N of push force, supported by a 20 mm diameter piston rod and PT1/4 ports.
This model includes a built-in magnet (-S suffix), allowing direct mounting of CMSG/DMSG/EMSG sensors on the tie-rod barrel for position feedback. The body length A is 194 mm, and the cylinder features an adjustable air cushion for smooth deceleration. It is a genuine AirTAC component built for reliable, repeatable motion control.
Airtac SCJ50 Standard Cylinder SCJ50X450-75S Technical Specifications
| Model | Airtac SCJ50 Standard Cylinder SCJ50X450-75S |
|---|---|
| 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 SCJ50X450-75S
| 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 SCJ50X450-75S Is Used
Commissioning & Process Setup
The 75 mm adjustment screw allows engineers to precisely set the end position during machine commissioning, accommodating variations in tooling or workpieces without needing to order multiple fixed-stroke cylinders.
Product Changeover on Packaging Lines
Quickly adapt the push stroke for different box or product sizes on a packaging line. The adjustable stroke eliminates the need for mechanical hard stops and reduces changeover time between formats.
Wear Compensation in Clamping
In clamping or pressing fixtures, the stroke can be incrementally extended with the adjusting screw to compensate for wear on pads or tooling, maintaining consistent clamping force without reprogramming.
Is the Airtac SCJ50 Standard Cylinder SCJ50X450-75S the Right Cylinder?
Choose the SCJ50X450-75S when you need a mid-range force actuator with the ability to dial in the stroke end position on the machine. 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. This adjustable-stroke model is ideal when the exact stroke is unknown at design time or may need to change, unlike a fixed-stroke SC cylinder. For a direct replacement, match the 50 mm bore, 450 mm nominal stroke, 75 mm adjust range, PT ports, and the -S magnet option. At this 450 mm stroke, ensure the rod is supported against side loads; if the application involves significant lateral force, pair the cylinder with an external guide or consider a guided cylinder.
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 SCJ50X450-75S FAQ
At the standard operating pressure of 0.5 MPa, the push force is 982 N and the pull force is 825 N. The force increases with pressure, reaching a maximum push force of 1767 N at 0.9 MPa. Because it is a single-rod cylinder, the push force is always greater than the pull force.
This SCJ50X450-75S is a direct replacement for any AirTAC SCJ cylinder with a 50 mm bore, 450 mm nominal stroke, and a 75 mm adjustment range. To ensure full compatibility, confirm your existing cylinder uses PT ports, a basic mount, and has a magnet for sensors. The tie-rod construction means it is not dimensionally interchangeable with ISO 15552 profile cylinders.
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