Airtac SAIJ125 Adjustable Cylinder SAIJ125X175-50
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125X175-50 is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø125mm bore and 175mm stroke, G1/2 air ports and adjustable end cushioning. Its standardized mounting interface makes it a drop-in replacement for other ISO 15552 cylinders in automation lines.
- BoreØ125 mm
- Stroke175 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2
- CushionAdjustable, 40 mm
About the Airtac SAIJ125 Adjustable Cylinder SAIJ125X175-50
The AirTAC SAIJ125X175-50 is a double-acting ISO 15552 profile cylinder featuring a rear stroke adjuster that trims the effective travel by up to 50 mm. This creates a usable 125-175 mm stroke window, allowing you to dial in the exact retract position during commissioning without swapping hardware. It delivers a robust 6136 N pull force at 0.5 MPa, making it well-suited for heavy positioning tasks.
The extruded aluminum barrel includes sensor grooves on both sides for flexible mounting of CMSE reed or DMSE electronic switches. The standard carbon steel rod uses an M27x2 thread, and the cylinder omits FB, CA, CB, and CR mounts, offering the reduced SAIJ mounting set of Basic, FA, LB, TC, FTC, TCM1, and TCM2.
Airtac SAIJ125 Adjustable Cylinder SAIJ125X175-50 Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125X175-50 |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø125 mm |
| Stroke | 175 mm |
| Acting type | Double acting |
| Port size | G1/2 |
| Rod thread | M27×2 |
| 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 – 500 mm/s |
| Cushion | Adjustable, 40 mm |
| Max stroke | Up to 1500 mm |
Specifications follow the official AirTAC SAI series datasheet and ISO 15552 dimensions. Confirm against the product label before installation. Port options: G (BSPP) / NPT.
Theoretical Output Force (Ø125mm)
| Pressure | Push force | Pull force |
|---|---|---|
| 0.5 MPa | 6136 N | 5734 N |
| 0.7 MPa | 8590 N | — |
| Max (@1.0 MPa) | 1251 kgf | |
Actual usable force is lower than theoretical due to friction and back-pressure. Size with a safety margin.
Model Code: Airtac SAIJ125 Adjustable Cylinder SAIJ125X175-50
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 125 | Bore size in mm. |
| ×175 | Stroke length in mm. |
| -S | Optional built-in magnet for sensor position sensing. |
Related SAI-family variants: SAID (double rod), SAIJ (adjustable stroke), SAIL (with lock), SAIF (with valve), BSAI (enclasp / clamp-lock), and SAI-S with built-in magnet. Rod material: carbon steel (blank) / SUS420J2 (A) / SUS304 (B); seals: TPU (blank) / Viton H / NBR N.
Where the Airtac SAIJ125 Adjustable Cylinder SAIJ125X175-50 Is Used
Variable End-Stop Positioning
Dial in the retract distance within the 125-175 mm window to accommodate varying material lengths without reinstalling the cylinder.
Machine Changeover
Quickly adjust the physical stopper during product size changes on automated packaging lines to minimize downtime.
Heavy Assembly Clamping
Leverage the 6136 N pull force to secure heavy components, using the adjustable stroke to set the exact clamping depth.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125X175-50 the Right Cylinder?
Choose this 125 mm bore when a 100 mm bore (offering 3681 N pull at 0.5 MPa) cannot provide enough force for your heavy loads. The 50 mm adjustment range is ideal for production lines running multiple product sizes, as the rear stopper fine-tunes the end position on the fly. For a fixed end-stop without the adjustment feature, select the standard SAI cylinder.
Because the rear adjuster acts only as a travel stop and not a lock, this cylinder cannot hold a load without live air pressure. If your application requires fail-safe load holding, consider the SAIL air-released lock or BSAI clamp-lock cylinder. This model uses PT tapered ports and operates at speeds of 30-500 mm/s.
Quick checklist
- ✓ Required force at your working pressure
- ✓ Stroke and mounting space
- ✓ Port/thread type (PT/NPT/G)
- ✓ Magnet (-S) for sensors?
- ✓ Side load — consider a guided cylinder
Installation & Maintenance Notes
- check Use clean air filtered to 40µm or finer.
- check Keep within 0.15 – 1.0 MPa operating pressure.
- check Avoid side load on the piston rod.
- check Adjust end cushion screws for smooth stops.
- check Use correct mounting accessory (FA/FB/CA/CB/LB/TC).
- check Installation by qualified personnel per AirTAC docs.
Airtac SAIJ125 Adjustable Cylinder SAIJ125X175-50 FAQ
The rear adjuster screw acts as a mechanical stopper, allowing you to shorten the nominal 175 mm stroke by up to 50 mm. This provides a usable travel window of 125 to 175 mm for fine-tuning the end position at commissioning.
At 0.5 MPa, it provides 6136 N of pull force and 8590 N of push force. At the maximum operating pressure of 1.0 MPa, the push force reaches 11045 N.
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Standard models usually ship in 3-4 days.
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