Airtac SCJ50 Standard Cylinder SCJ50X175-20
The AirTAC Airtac SCJ50 Standard Cylinder SCJ50X175-20 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 SCJ50X175-20
The SCJ50X175-20 delivers a nominal 175 mm stroke that you can fine-tune in the field by up to 20 mm using the rear-cap adjusting screw, letting you dial in the exact end position without swapping the cylinder. With a 20 mm rod and PT1/4 ports, this single-rod double-acting unit produces 982 N of push force at 0.5 MPa (1767 N at 0.9 MPa), suiting it for medium-force positioning and clamping tasks where the stroke needs to be set once and tweaked later.
The 50 mm bore SCJ body has an A dimension of 194 mm and a 21 mm air cushion at each end to decelerate the piston quietly. Its tie-rod construction keeps it serviceable, and the adjustable stroke end is purely mechanical—it sets the retract limit within the 20 mm band but does not alter the cylinder's force output or speed capability.
Airtac SCJ50 Standard Cylinder SCJ50X175-20 Technical Specifications
| Model | Airtac SCJ50 Standard Cylinder SCJ50X175-20 |
|---|---|
| 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 SCJ50X175-20
| 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 SCJ50X175-20 Is Used
Commissioning & Setup
During machine build, the 20 mm adjustment screw lets technicians fine-tune the cylinder's end stop to match the exact tooling position, eliminating the need to shim or reposition the cylinder body.
Format Changeover
On a packaging line that runs multiple box sizes, the adjustable stroke lets operators quickly reset the pusher stroke end for each format, reducing changeover time compared to swapping fixed-stroke cylinders.
Wear Compensation
In clamping or pressing fixtures, the screw can be advanced slightly over time to take up pad wear or seal compression, maintaining consistent clamping force without replacing the cylinder or adding shims.
Is the Airtac SCJ50 Standard Cylinder SCJ50X175-20 the Right Cylinder?
Step up to a 63 mm bore SCJ if your application needs more push force (1559 N at 0.5 MPa); step down to a 40 mm bore if 628 N is sufficient and you want a lighter, more compact unit. The SCJ is the right choice when you need to adjust the stroke end on the machine—during commissioning, after tooling wear, or for different product formats—without adding external hard stops. For a fixed, non-adjustable stroke, the standard SC series is a simpler, lower-cost alternative. If you are replacing an existing SCJ50X175-20, match the bore, 175 mm nominal stroke, 20 mm adjust range, PT port thread, and basic mounting to ensure drop-in interchangeability.
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 SCJ50X175-20 FAQ
At 0.5 MPa the push force is 982 N and the pull force is 825 N (the rod reduces the piston area on the return stroke). At the maximum operating pressure of 0.9 MPa, push force reaches 1767 N. Always size your cylinder using the pull force if the return stroke does the work.
Physically the SCJ will mount in the same space, but it is slightly longer due to the rear adjusting mechanism (body length A=194 mm). The SCJ gives you up to 20 mm of stroke-end adjustment that the fixed SC does not have. If you need the exact same overall length and do not require adjustability, order the standard SC50X175 instead.
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