Airtac SCJ50 Standard Cylinder SCJ50X175-20S
The AirTAC Airtac SCJ50 Standard Cylinder SCJ50X175-20S 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, 175mm nominal stroke, PT1/4 ports and adjustable end cushioning.
- BoreØ50 mm
- Nominal stroke175 mm
- Stroke adjust-20 mm
- Port sizePT1/4
- Rod threadM16×1.5
- CushionAdjustable, 21 mm
About the Airtac SCJ50 Standard Cylinder SCJ50X175-20S
The SCJ50X175-20S is a double-acting, single-rod pneumatic cylinder from AirTAC's adjustable-stroke series, delivering 982 N of push force at 0.5 MPa. A rear-cap adjusting screw lets you fine-tune the stroke end position within a 20 mm range, making it ideal for commissioning trials or format changeovers where the exact stop point must be dialled in on the machine without swapping the cylinder.
This model features a 20 mm diameter piston rod and a 50 mm bore, with a body length A(SCJ) of 194 mm. The integrated magnet allows direct mounting of CMSG/DMSG/EMSG reed or solid-state sensors along the tie-rod barrel for reliable end-of-stroke detection. It uses PT1/4 ports and operates with filtered air from 0.15 to 1.0 MPa across a standard temperature range of -20 to +70 °C.
Airtac SCJ50 Standard Cylinder SCJ50X175-20S Technical Specifications
| Model | Airtac SCJ50 Standard Cylinder SCJ50X175-20S |
|---|---|
| Series | SCJ adjustable-stroke tie-rod cylinder |
| Bore size | Ø50 mm |
| Nominal stroke | 175 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 SCJ50X175-20S
| SCJ | Adjustable-stroke tie-rod cylinder series. |
|---|---|
| 50 | Bore size in mm. |
| ×175 | 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 SCJ50X175-20S Is Used
Commissioning & Setup
Field technicians can micro-adjust the 20 mm stroke end to perfectly align a stop position during initial machine setup, eliminating the need to fabricate shims or reposition hard stops.
Product Format Changeover
On packaging or sorting lines, the adjustable stroke allows operators to quickly reset the cylinder's end position for different product sizes without replacing the actuator, reducing downtime between batches.
Wear Compensation
In clamping or pressing fixtures, the screw can be advanced to take up mechanical wear on tooling or contact surfaces over time, maintaining consistent clamping force and position without a full cylinder rebuild.
Is the Airtac SCJ50 Standard Cylinder SCJ50X175-20S the Right Cylinder?
Choose the SCJ50X175-20S when you need mid-range force and the ability to adjust the stroke end without mechanical stops. If your application demands higher force, stepping up to the 63 mm bore provides 1559 N of push force at 0.5 MPa. For a simpler, fixed-stroke solution where adjustability is not required, the standard SC50 series is a direct alternative. This cylinder is a drop-in replacement for another AirTAC SCJ adjustable-stroke unit of the same 50 mm bore, 175 mm nominal stroke, and 20 mm adjustment range, provided the port thread (PT) and magnet option match. For strokes of this length, ensure the rod is adequately supported against side loads; if significant lateral force is present, consider adding an external guide rail or switching to a guided cylinder assembly.
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 SCJ50X175-20S FAQ
At 0.5 MPa, the push force is 982 N and the pull force is 825 N. The push force is higher because the single piston rod reduces the effective piston area on the return stroke. The maximum theoretical force at 1.0 MPa is 200 kgf.
Yes, if you need the adjustable stroke feature. The SCJ50X175-20S shares the same 50 mm bore, 20 mm rod, and PT1/4 porting as a fixed-stroke SC50. However, the SCJ body is slightly longer to house the adjusting screw. Ensure the 175 mm nominal stroke and 20 mm adjustment range fit your machine's envelope.
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