Airtac SAIJ125 Adjustable Cylinder SAIJ125AX70-40
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125AX70-40 is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø125mm bore and 70mm 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
- Stroke70 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2
- CushionAdjustable, 40 mm
About the Airtac SAIJ125 Adjustable Cylinder SAIJ125AX70-40
The AirTAC SAIJ125X70-40 is a double-acting ISO 15552 profile cylinder featuring a rear-mounted stroke adjuster. It provides a 30-70 mm usable travel window by trimming the 70 mm nominal stroke up to 40 mm, enabling exact end-position tuning without swapping hardware. It delivers 6136 N of pull force at 0.5 MPa, making it suitable for heavy-duty positioning.
This SKU features a SUS420J2 stainless steel rod for enhanced corrosion resistance and PT tapered ports for a tight pneumatic seal. The extruded aluminum barrel includes sensor grooves on both sides, and the standard variable air cushions at both ends decelerate the heavy 125 mm piston to achieve a controlled stop within the 30-500 mm/s speed range.
Airtac SAIJ125 Adjustable Cylinder SAIJ125AX70-40 Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125AX70-40 |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø125 mm |
| Stroke | 70 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 SAIJ125AX70-40
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 125 | Bore size in mm. |
| ×70 | 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 SAIJ125AX70-40 Is Used
Variable End Stops
Dial in the 30-70 mm travel window during machine setup to accommodate varying material thicknesses without adding external physical stops.
Product Changeover
Quickly reconfigure the stroke on automated lines when switching between product sizes, using the rear screw to set the exact retraction point.
Heavy-Duty Positioning
Leverage the 6136 N pull force to move substantial jigs or fixtures, fine-tuning the final resting position via the external adjuster.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125AX70-40 the Right Cylinder?
Select this 125 mm bore model when your application requires the 6136 N pull force at 0.5 MPa and a variable end-stop for product changeovers. If your process needs less push force, stepping down to a 100 mm bore yields 3927 N, whereas moving up to a 160 mm bore provides 10053 N. The adjustable stroke is ideal for fine-tuning at commissioning, but the rear adjuster acts only as a travel stop; it will not hold a load without live air. For position holding without pressure, consider an external rod lock, or AirTAC SAIL and BSAI series cylinders. As a dimensionally interchangeable ISO 15552 cylinder, it matches replacements using a 125 mm bore, 70 mm stroke, 40 mm adjustment, PT ports, and Basic, FA, LB, TC, FTC, TCM1, or TCM2 mountings.
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 SAIJ125AX70-40 FAQ
At 0.5 MPa operating pressure, this 125 mm bore cylinder provides 6136 N of pull force and 8590 N of push force. At the maximum 1.0 MPa pressure, it can deliver up to 1251 kgf.
The rear adjuster allows you to shorten the 70 mm nominal stroke by up to 40 mm, creating a 30-70 mm usable travel window. This enables fine-tuning of the end position at commissioning without replacing the cylinder.
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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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