Airtac SCJ50 Standard Cylinder SCJ50X175-40
The AirTAC Airtac SCJ50 Standard Cylinder SCJ50X175-40 is a genuine double-acting SINGLE-ROD air cylinder with a rear-cap ADJUSTING SCREW: the stroke end is field-adjustable within a 40 mm range without swapping the cylinder. Ø50mm bore, 175mm nominal stroke, PT1/4 ports and adjustable end cushioning.
- BoreØ50 mm
- Nominal stroke175 mm
- Stroke adjust-40 mm
- Port sizePT1/4
- Rod threadM16×1.5
- CushionAdjustable, 21 mm
About the Airtac SCJ50 Standard Cylinder SCJ50X175-40
The SCJ50X175-40 is a 50 mm bore, double-acting, single-rod tie-rod cylinder that delivers a robust 982 N push force at 0.5 MPa. Its defining feature is a rear-cap adjusting screw that provides a 40 mm field-adjustable stroke range, letting you dial in the exact stroke end position from 135 mm up to the nominal 175 mm. This makes it ideal for applications where the mechanical stop needs precise tuning during commissioning or format changeovers.
Equipped with a 20 mm diameter piston rod, PT1/4 pneumatic ports, and a 21 mm air cushion, this cylinder decelerates the piston smoothly at the end of travel. The body length A for the SCJ series is 194 mm, making it slightly longer than a fixed-stroke SC of the same bore to accommodate the adjustment mechanism. It operates on 40 µm filtered air at 0.15-1.0 MPa and can handle speeds from 30 to 800 mm/s.
Airtac SCJ50 Standard Cylinder SCJ50X175-40 Technical Specifications
| Model | Airtac SCJ50 Standard Cylinder SCJ50X175-40 |
|---|---|
| Series | SCJ adjustable-stroke tie-rod cylinder |
| Bore size | Ø50 mm |
| Nominal stroke | 175 mm |
| Stroke adjustment | Up to 40 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 SCJ50X175-40
| SCJ | Adjustable-stroke tie-rod cylinder series. |
|---|---|
| 50 | Bore size in mm. |
| ×175 | Nominal (maximum) stroke length in mm. |
| -40 | 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 SCJ50X175-40 Is Used
Commissioning & Setup
During initial machine setup, the 40 mm adjustment screw allows technicians to precisely dial in the actuator's end stop without needing to shim or reposition the entire cylinder, saving significant commissioning time.
Product Format Changeover
Ideal for packaging or sorting lines that handle different product sizes. An operator can quickly adjust the stroke end to accommodate a new box height or pallet width, minimizing downtime between production runs.
Wear Compensation
In clamping or pressing fixtures, the adjustable stroke can be used to take up mechanical wear on tooling or contact surfaces over time, maintaining consistent clamping force and position without replacing parts.
Is the Airtac SCJ50 Standard Cylinder SCJ50X175-40 the Right Cylinder?
This 50 mm bore model strikes a balance between force and physical size. If you need more push force, stepping up to the 63 mm bore provides 1559 N at 0.5 MPa, while a step down to the 40 mm bore offers 628 N for lighter, more compact designs. The SCJ is the right choice when you need to fine-tune the stroke end on the machine; if your stroke length is fixed, a standard SC series cylinder is a more economical alternative. For direct replacement, match the 50 mm bore, 175 mm nominal stroke, 40 mm adjust range, PT port thread, and basic mounting.
For this 175 mm stroke length, be mindful of side loads. The piston rod is designed for axial force, and any significant radial load can cause premature wear or rod bending. If your application involves a side load, use an external guide rail or consider a guided cylinder assembly to ensure long service life.
Adjustable-stroke checklist
- ✓ Need to fine-tune stroke on the line?
- ✓ Nominal stroke + adjust range (-40)
- ✓ 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 SCJ50X175-40 FAQ
The theoretical push force at 0.5 MPa is 982 N, and the pull force is 825 N (the difference is due to the rod area). At the maximum operating pressure of 1.0 MPa, the theoretical push force reaches 1963 N. Always apply a safety factor for real-world dynamic loads.
A rear-cap screw sets the stroke end position within a 40 mm range, allowing the effective stroke to be adjusted from 135 mm to 175 mm. Choose the SCJ when your application requires fine-tuning of the end stop on the machine, such as for format changes or wear take-up. If the stroke length is a fixed, known value, the standard SC series cylinder is a more cost-effective solution.
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