Airtac SCJ50 Standard Cylinder SCJ50X175-75S
The AirTAC Airtac SCJ50 Standard Cylinder SCJ50X175-75S 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, 175mm nominal stroke, PT1/4 ports and adjustable end cushioning.
- BoreØ50 mm
- Nominal stroke175 mm
- Stroke adjust-75 mm
- Port sizePT1/4
- Rod threadM16×1.5
- CushionAdjustable, 21 mm
About the Airtac SCJ50 Standard Cylinder SCJ50X175-75S
The SCJ50X175-75S is a 50 mm bore double-acting single-rod cylinder with a field-adjustable stroke end, letting you fine-tune the retract position by up to 75 mm without swapping the unit. Its 20 mm rod and PT1/4 ports deliver 982 N of push force at 0.5 MPa, rising to 1767 N at the 0.9 MPa maximum operating pressure.
This model includes a built-in magnet, so CMSG/DMSG/EMSG reed or solid-state sensors clamp directly onto the tie-rod barrel for reliable end-of-stroke detection. The adjustable screw shortens the stroke end mechanically, making it ideal for commissioning trials, format changeovers, or taking up wear on tooling where a fixed 175 mm nominal stroke would otherwise require shimming or external stops.
Airtac SCJ50 Standard Cylinder SCJ50X175-75S Technical Specifications
| Model | Airtac SCJ50 Standard Cylinder SCJ50X175-75S |
|---|---|
| Series | SCJ adjustable-stroke tie-rod cylinder |
| Bore size | Ø50 mm |
| Nominal stroke | 175 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 SCJ50X175-75S
| SCJ | Adjustable-stroke tie-rod cylinder series. |
|---|---|
| 50 | Bore size in mm. |
| ×175 | 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 SCJ50X175-75S Is Used
Commissioning & Setup
The 75 mm adjustment range lets technicians dial in the exact retract stop during machine bring-up without cutting brackets or adding shims, speeding up line commissioning.
Format Changeovers
On packaging or assembly machines that run multiple product sizes, the rear screw allows a quick stroke-end change between batches, reducing downtime compared to swapping fixed-stroke cylinders.
Wear Compensation
When tooling or gripper pads wear over time, the adjustable stop can be tweaked to maintain precise part contact, extending the service interval before a full cylinder rebuild is needed.
Is the Airtac SCJ50 Standard Cylinder SCJ50X175-75S the Right Cylinder?
Step up to the 63 mm bore SCJ if your application needs more than 1767 N of push force at 0.9 MPa; the 63 mm bore provides 2805 N. For purely fixed-stroke applications where field adjustment is never needed, the standard SC series offers the same bore and mounting footprint without the rear adjusting screw. This SCJ50X175-75S replaces another AirTAC SCJ of the same 50 mm bore, 175 mm nominal stroke, and 75 mm adjust range, provided the port thread is PT and the magnet option is present.
At 175 mm stroke, rod bending from side loads is generally manageable, but if the load is not guided externally, consider adding a guide rod or switching to a guided cylinder to protect the rod bearing and seal.
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 SCJ50X175-75S FAQ
At 0.5 MPa, the push force is 982 N and the pull force is 825 N. At the maximum operating pressure of 0.9 MPa, push force reaches 1767 N. Because this is a single-rod cylinder, push force is always greater than pull force.
Yes, if the bore, nominal stroke, and port thread match. The SCJ body is slightly longer (A=194 mm) to house the adjusting screw, so check your machine envelope. The SCJ adds stroke-end adjustability that the fixed SC does not have.
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