Airtac SCJ50 Standard Cylinder SCJ50X300-75
The AirTAC Airtac SCJ50 Standard Cylinder SCJ50X300-75 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, 300mm nominal stroke, PT1/4 ports and adjustable end cushioning.
- BoreØ50 mm
- Nominal stroke300 mm
- Stroke adjust-75 mm
- Port sizePT1/4
- Rod threadM16×1.5
- CushionAdjustable, 21 mm
About the Airtac SCJ50 Standard Cylinder SCJ50X300-75
The SCJ50X300-75 is a double-acting, single-rod pneumatic cylinder that puts stroke-end fine-tuning directly in your hands. With a 75 mm rear adjusting screw, you can shorten the effective stroke on the fly—ideal for commissioning trials or format changeovers without swapping the cylinder. It delivers a substantial 1767 N of push force at 0.9 MPa, driven by a 20 mm diameter piston rod.
Built on a robust tie-rod body with a length of 194 mm (A dimension), this cylinder uses PT1/4 ports and an M16x1.5 rod thread. The adjustable air cushion decelerates the piston smoothly, and the 300 mm nominal stroke is well within the 1200 mm maximum standard stroke for this 50 mm bore class. It's a practical choice when you need to dial in a precise end position on a packaging or assembly machine.
Airtac SCJ50 Standard Cylinder SCJ50X300-75 Technical Specifications
| Model | Airtac SCJ50 Standard Cylinder SCJ50X300-75 |
|---|---|
| Series | SCJ adjustable-stroke tie-rod cylinder |
| Bore size | Ø50 mm |
| Nominal stroke | 300 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 SCJ50X300-75
| SCJ | Adjustable-stroke tie-rod cylinder series. |
|---|---|
| 50 | Bore size in mm. |
| ×300 | 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 SCJ50X300-75 Is Used
Commissioning & Setup
Fine-tune the end stop during machine commissioning without cutting rods or adding external hard stops. The 75 mm adjustment range lets technicians quickly dial in the perfect stroke for a new product format.
Product Changeover
On a multi-product packaging line, the adjustable stroke allows operators to reset the pusher stroke for different box sizes in seconds, minimizing downtime between production runs.
Wear Compensation
In clamping or pressing fixtures, the rear screw can be advanced to take up mechanical wear on tooling or seals, maintaining consistent clamp force and position without replacing the entire cylinder.
Is the Airtac SCJ50 Standard Cylinder SCJ50X300-75 the Right Cylinder?
Choose the SCJ50X300-75 when your application requires a 300 mm maximum reach but the final stop point needs to be field-adjusted up to 75 mm shorter. If you need more force, stepping up to the 63 mm bore provides 2805 N of push at 0.9 MPa. For a fixed, non-adjustable stroke, the standard SC series is a simpler alternative. As a direct replacement, match the 50 mm bore, 300 mm nominal stroke, 75 mm adjust range, PT port thread, and basic mounting. For this 300 mm stroke, be mindful of side loads; if the rod is not guided externally, consider adding a guide rod or switching to a guided cylinder to prevent rod bending and ensure long seal life.
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 SCJ50X300-75 FAQ
At the standard 0.7 MPa operating pressure, the cylinder provides 1374 N of push force and 825 N of pull force. The pull force is lower due to the area of the 20 mm piston rod. The maximum push force at 0.9 MPa is 1767 N.
Yes, if you need the ability to adjust the stroke end. The SCJ50X300-75 has the same 50 mm bore, PT1/4 ports, and basic mounting pattern as an SC50X300. Ensure the 75 mm rear screw protrusion is accommodated in your machine layout, and match the port thread and magnet option for a direct fit.
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