Airtac SAIJ125 Adjustable Cylinder SAIJ125AX135-40
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125AX135-40 is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø125mm bore and 135mm 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
- Stroke135 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2
- CushionAdjustable, 40 mm
About the Airtac SAIJ125 Adjustable Cylinder SAIJ125AX135-40
The AirTAC SAIJ125X135-40 is a double-acting ISO 15552 profile cylinder featuring a rear-mounted stroke adjuster. It provides a 95-135 mm usable travel window, allowing you to trim the nominal 135 mm stroke by up to 40 mm during machine setup. This bore size generates a substantial 6136 N push force at 0.5 MPa, making it well-suited for heavy-duty positioning tasks.
This SKU is configured with a SUS420J2 stainless steel rod (material code A) for improved corrosion resistance and PT tapered port threads. The extruded aluminum barrel includes sensor grooves on both sides for mounting CMSE reed or DMSE electronic switches if a magnet is added later. The rear stopper mechanism decelerates travel but does not lock the load without live air pressure.
Airtac SAIJ125 Adjustable Cylinder SAIJ125AX135-40 Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125AX135-40 |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø125 mm |
| Stroke | 135 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 SAIJ125AX135-40
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 125 | Bore size in mm. |
| ×135 | 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 SAIJ125AX135-40 Is Used
Variable End-Stop Positioning
Dial in the exact retraction point for heavy workholding clamps, trimming up to 40 mm of travel without swapping hardware.
Product Size Changeover
Quickly adapt a packaging or handling line to different carton lengths by adjusting the 95-135 mm stroke window at the rear screw.
Commissioning Fine-Tuning
Perfect the end-position during initial machine setup to account for mechanical tolerance stack-up without adding external stops.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125AX135-40 the Right Cylinder?
Select this 125 mm bore when an application requires high force (6136 N at 0.5 MPa) but the exact end-of-stroke position varies by product size. The 40 mm adjustment window is ideal for changeovers, whereas a fixed-stroke SAI cylinder would require physical shimming. If your force requirements are lower, stepping down to an 80 mm bore yields 2513 N at 0.5 MPa. For applications needing true load-holding without live air, consider the SAIL or BSAI series, as this adjuster is a stop, not a lock. With a 135 mm stroke, side-loading is minimal, but long unsupported strokes still require an external guide. Mounting options include Basic, FA, LB, TC, FTC, TCM1, and TCM2.
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 SAIJ125AX135-40 FAQ
At 0.5 MPa operating pressure, this 125 mm bore cylinder provides 6136 N of push force and 5734 N of pull force. It uses a G1/2 port with PT tapered threads and operates at speeds of 30-500 mm/s.
The rear adjuster screw allows you to shorten the effective stroke from its nominal 135 mm down to 95 mm. This creates a 95-135 mm travel window for fine-tuning the end position at commissioning without replacing the cylinder.
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