Airtac SAIJ125 Adjustable Cylinder SAIJ125X500-40
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125X500-40 is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø125mm bore and 500mm 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
- Stroke500 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2
- CushionAdjustable, 40 mm
About the Airtac SAIJ125 Adjustable Cylinder SAIJ125X500-40
The AirTAC SAIJ125X500-40 is a double-acting, single-rod ISO 15552 profile cylinder featuring a rear-mounted stroke adjuster. It delivers a robust 6136N push force at 0.5 MPa, making it ideal for heavy-duty operations. The built-in rear stopper allows you to trim the effective travel, creating a precise 460-500mm usable stroke window without needing external stops.
This 125mm bore unit uses a PT tapered port and operates at speeds of 30-500 mm/s. It features an extruded aluminum barrel with sensor grooves on both sides. Because no magnet is specified, position sensing requires adding a magnetic piston assembly to use CMSE reed or DMSE electronic switches.
Airtac SAIJ125 Adjustable Cylinder SAIJ125X500-40 Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125X500-40 |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø125 mm |
| Stroke | 500 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 SAIJ125X500-40
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 125 | Bore size in mm. |
| ×500 | 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 SAIJ125X500-40 Is Used
Variable End Stops
Dial in the exact 460-500mm travel distance during machine setup to accommodate different material thicknesses without swapping hardware.
Product Changeover
Quickly adjust the retract end-position on a production line when switching to a new product size, minimizing downtime between runs.
Heavy-Duty Forming
Leverage the 6136N push force at 0.5 MPa for pressing or forming tasks while fine-tuning the end-stop to prevent overtravel.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125X500-40 the Right Cylinder?
Select this 125mm bore when an application requires substantial force—such as the 6136N push thrust at 0.5 MPa—but still needs on-the-fly end-position tuning. If your process demands less force, stepping down to a 100mm bore yields 3927N at 0.5 MPa. Choose this adjustable SAIJ over a fixed SAI when you need commissioning flexibility for varying product sizes. Note that the rear adjuster is a travel stop, not a lock; for load-holding without live air pressure, consider the SAIL or BSAI series. To ensure proper ISO 15552 replacement matching, verify the 500mm stroke, 40mm adjustment, PT port, and mounting choice (Basic, FA, LB, TC, FTC, TCM1, or TCM2). Because the 500mm stroke is long, an external guide is recommended to manage side loads on the 32mm carbon steel rod.
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 SAIJ125X500-40 FAQ
The rear adjuster acts as a mechanical stop that lets you shorten the nominal 500mm stroke by up to 40mm. This creates a usable travel window of 460-500mm, allowing precise end-position tuning at commissioning without external stops.
At 0.5 MPa operating pressure, it provides 6136N of push force and 5734N of pull force. At 0.7 MPa, the push force increases to 8590N.
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Covers non-human-caused product damage.
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Standard models usually ship in 3-4 days.
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