Airtac SCJ50 Standard Cylinder SCJ50X175-50
The AirTAC Airtac SCJ50 Standard Cylinder SCJ50X175-50 is a genuine double-acting SINGLE-ROD air cylinder with a rear-cap ADJUSTING SCREW: the stroke end is field-adjustable within a 50 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-50 mm
- Port sizePT1/4
- Rod threadM16×1.5
- CushionAdjustable, 21 mm
About the Airtac SCJ50 Standard Cylinder SCJ50X175-50
The SCJ50X175-50 is a 50 mm bore double-acting single-rod cylinder with a rear-cap adjusting screw that provides up to 50 mm of field-adjustable stroke reduction. At the standard 0.5 MPa operating pressure, it delivers 982 N of push force and 825 N on the pull stroke, driven by a 20 mm diameter piston rod.
This tie-rod cylinder uses PT1/4 ports and includes an adjustable air cushion (21 mm length) to decelerate the piston smoothly. The body length A measures 194 mm, and the nominal 175 mm stroke is well within the 1200 mm maximum standard stroke for this bore, making it a ready-to-ship configuration for commissioning and format-change applications.
Airtac SCJ50 Standard Cylinder SCJ50X175-50 Technical Specifications
| Model | Airtac SCJ50 Standard Cylinder SCJ50X175-50 |
|---|---|
| Series | SCJ adjustable-stroke tie-rod cylinder |
| Bore size | Ø50 mm |
| Nominal stroke | 175 mm |
| Stroke adjustment | Up to 50 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 SCJ50X175-50
| SCJ | Adjustable-stroke tie-rod cylinder series. |
|---|---|
| 50 | Bore size in mm. |
| ×175 | Nominal (maximum) stroke length in mm. |
| -50 | 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 SCJ50X175-50 Is Used
Commissioning & Setup
Field engineers can dial in the exact stroke end position via the rear screw during initial machine commissioning, eliminating the need to stock multiple fixed-stroke cylinders for trial runs.
Format Changeover
On packaging or assembly lines, the 50 mm adjustment range allows a single actuator to handle multiple product sizes by quickly resetting the stop position for different box heights or part lengths.
Wear Compensation
In clamping or pressing fixtures, the adjustable stroke takes up mechanical wear on tooling or workpieces over time, maintaining consistent contact force without reprogramming the machine controller.
Is the Airtac SCJ50 Standard Cylinder SCJ50X175-50 the Right Cylinder?
Choose the SCJ50X175-50 when you need to fine-tune the stroke end position on a machine without swapping the cylinder. If 825 N of pull force is marginal, stepping up to a 63 mm bore provides 1402 N of pull at the same 0.5 MPa. For applications that do not require stroke adjustment, a fixed-stroke SC50X175 simplifies the bill of materials.
A direct replacement must match the 50 mm bore, 175 mm nominal stroke, 50 mm adjust range, PT port thread, and basic mounting. For strokes of 175 mm, verify that the rod is adequately guided; if the load applies a side force, add an external guide rail or switch to a guided cylinder to prevent rod bending and premature seal wear.
Adjustable-stroke checklist
- ✓ Need to fine-tune stroke on the line?
- ✓ Nominal stroke + adjust range (-50)
- ✓ 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 SCJ50X175-50 FAQ
At 0.5 MPa, the cylinder produces 982 N of push force and 825 N of pull force. The maximum operating push force at 0.9 MPa is 1767 N. The pull force is lower because the 20 mm rod reduces the effective piston area on the return stroke.
A rear-cap screw lets you shorten the stroke end by up to 50 mm from the 175 mm nominal maximum. Pick the SCJ when you need to fine-tune the stop position during setup, accommodate different product sizes, or compensate for tooling wear. Choose a fixed-stroke SC cylinder if the stroke length is permanently fixed and you want a simpler, lower-cost actuator.
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