Airtac SCJ50 Standard Cylinder SCJ50X450-20
The AirTAC Airtac SCJ50 Standard Cylinder SCJ50X450-20 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, 450mm nominal stroke, PT1/4 ports and adjustable end cushioning.
- BoreØ50 mm
- Nominal stroke450 mm
- Stroke adjust-20 mm
- Port sizePT1/4
- Rod threadM16×1.5
- CushionAdjustable, 21 mm
About the Airtac SCJ50 Standard Cylinder SCJ50X450-20
The SCJ50X450-20 is a double-acting, single-rod pneumatic cylinder with a rear-cap adjusting screw that provides a 20 mm field-adjustable stroke-end range. With a 50 mm bore and a 20 mm diameter piston rod, it delivers 982 N of push force and 825 N of pull force at 0.5 MPa, making it a capable mid-range actuator for tasks that require precise end-position tuning.
This model features a 450 mm nominal stroke, well within the 1200 mm maximum standard stroke for the 50 mm bore. The adjustable screw shortens the stroke end by up to 20 mm, allowing operators to dial in the exact stopping point for commissioning, format changes, or wear compensation. The cylinder body has a length of 194 mm, uses PT1/4 ports, and includes an adjustable air cushion for smooth deceleration.
Airtac SCJ50 Standard Cylinder SCJ50X450-20 Technical Specifications
| Model | Airtac SCJ50 Standard Cylinder SCJ50X450-20 |
|---|---|
| Series | SCJ adjustable-stroke tie-rod cylinder |
| Bore size | Ø50 mm |
| Nominal stroke | 450 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.
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 SCJ50X450-20
| SCJ | Adjustable-stroke tie-rod cylinder series. |
|---|---|
| 50 | Bore size in mm. |
| ×450 | 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.
Where the Airtac SCJ50 Standard Cylinder SCJ50X450-20 Is Used
Commissioning & Setup
During machine commissioning, the 20 mm adjustment screw allows technicians to quickly dial in the exact stroke end position without fabricating shims or moving hard stops, speeding up the final setup process.
Product Format Changeover
On packaging lines, the adjustable stroke lets operators change the push-out distance for different box sizes by simply turning the rear screw, minimizing downtime between production runs.
Wear Compensation
In clamping or pressing fixtures, the stroke end can be slightly extended over time to compensate for pad wear, maintaining consistent clamping force without replacing the cylinder or tooling.
Is the Airtac SCJ50 Standard Cylinder SCJ50X450-20 the Right Cylinder?
Choose the SCJ50X450-20 when you need a mid-force actuator with a stroke that can be fine-tuned on the machine. If the 982 N push force at 0.5 MPa is insufficient, stepping up to the 63 mm bore (SCJ63 series) provides 1559 N of push force. For applications requiring a fixed, non-adjustable stroke, the standard SC50X450 is a direct alternative. A direct replacement must match the 50 mm bore, 450 mm nominal stroke, 20 mm adjustable range, PT port thread, and basic mounting style.
For a 450 mm stroke, be mindful of side-loading on the rod. If the load is not guided externally, the extended rod may be subject to bending moments. In such cases, use an external guide rail or consider a guided cylinder assembly to protect the rod bearing and seals from premature wear.
Adjustable-stroke checklist
- ✓ Need to fine-tune stroke on the line?
- ✓ Nominal stroke + adjust range (-20)
- ✓ 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 SCJ50X450-20 FAQ
At the standard operating pressure of 0.5 MPa, this 50 mm bore cylinder generates 982 N of push force and 825 N of pull force. The maximum push force at 0.9 MPa is 1767 N. The push force is higher than the pull force because the single rod reduces the piston area on the return side.
Yes, if you need the ability to fine-tune the stroke end. The SCJ50X450-20 has the same bore, rod diameter, and port size as an SC50X450, but includes a rear adjusting screw that can shorten the stroke by up to 20 mm. Ensure your mounting and port thread (PT) match, and confirm the slightly longer body length fits your machine envelope.
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