Airtac SCJ40 Standard Cylinder SCJ40X175-20S
The AirTAC Airtac SCJ40 Standard Cylinder SCJ40X175-20S 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. Ø40mm bore, 175mm nominal stroke, PT1/4 ports and adjustable end cushioning.
- BoreØ40 mm
- Nominal stroke175 mm
- Stroke adjust-20 mm
- Port sizePT1/4
- Rod threadM12×1.25
- CushionAdjustable, 21 mm
About the Airtac SCJ40 Standard Cylinder SCJ40X175-20S
The SCJ40X175-20S is a double-acting, single-rod pneumatic cylinder offering field-adjustable stroke end positioning. Its rear-cap screw provides up to 20 mm of adjustment from the 175 mm nominal stroke, making it ideal for fine-tuning end-of-travel during commissioning or format changes without swapping the cylinder. This model includes a built-in magnet for direct mounting of CMSG/DMSG/EMSG sensors.
With a 40 mm bore and 16 mm piston rod, it delivers 628 N of push force and 528 N of pull force at 0.5 MPa. The PT1/4 port and M12x1.25 rod thread are standard, while the 21 mm air cushion aids smooth deceleration. The body length is 185 mm, slightly longer than the fixed-stroke SC version to accommodate the adjustment mechanism.
Airtac SCJ40 Standard Cylinder SCJ40X175-20S Technical Specifications
| Model | Airtac SCJ40 Standard Cylinder SCJ40X175-20S |
|---|---|
| Series | SCJ adjustable-stroke tie-rod cylinder |
| Bore size | Ø40 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 | M12×1.25 |
| 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 (Ø40mm)
| Pressure | Push force | Pull force |
|---|---|---|
| 0.5 MPa | 628 N | 528 N |
| 0.7 MPa | 880 N | — |
| Max (@1.0 MPa) | 128 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 SCJ40 Standard Cylinder SCJ40X175-20S
| SCJ | Adjustable-stroke tie-rod cylinder series. |
|---|---|
| 40 | 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 SCJ40 Standard Cylinder SCJ40X175-20S Is Used
Commissioning Fine-Tuning
Allows engineers to make small, precise stroke adjustments on new equipment without swapping cylinders, speeding up machine setup and validation.
Wear Compensation
In high-cycle clamping or pressing fixtures, the 20 mm adjustment can be used to take up mechanical wear on tooling or contact surfaces over time.
Sensor-Ready Positioning
The integrated magnet works with CMSG/DMSG sensors to provide reliable end-of-stroke detection, even after the stroke length has been field-adjusted.
Is the Airtac SCJ40 Standard Cylinder SCJ40X175-20S the Right Cylinder?
Choose the SCJ40X175-20S when you need to precisely dial in a 175 mm stroke on the machine. If 628 N of push force is insufficient, stepping up to the 50 mm bore provides 982 N at the same pressure. For applications where the stroke length is fixed and will never need field adjustment, the standard SC series offers a more compact and cost-effective alternative. To replace this cylinder, match the 40 mm bore, 175 mm nominal stroke, 20 mm adjustment range, PT ports, and the -S magnet option.
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 SCJ40 Standard Cylinder SCJ40X175-20S FAQ
At the standard operating pressure of 0.5 MPa, this cylinder generates 628 N of push force and 528 N of pull force. The push force is higher because it acts on the full 40 mm bore area, while pull force is reduced by the 16 mm rod cross-section.
A screw in the rear end-cap acts as an internal mechanical stop for the piston. Turning the screw shortens the stroke end by up to 20 mm from the nominal 175 mm. It sets the retracted position, not the extended one, and does not adjust force or speed.
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