Airtac SAIJ125 Adjustable Cylinder SAIJ125X70-40
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125X70-40 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 SAIJ125X70-40
The AirTAC SAIJ125X70-40 is a double-acting ISO 15552 profile cylinder featuring a rear-mounted stroke adjuster. It delivers a substantial 6136N push and 5734N pull force at 0.5 MPa, utilizing a 32mm carbon steel rod and M27x2 thread to manage heavy loads. The rear stopper screw allows you to trim the nominal 70mm stroke back by up to 40mm, creating a precise 30-70mm usable travel window for exact end-position tuning.
Unlike a fixed-stroke SAI cylinder, this adjustable variant eliminates the need to swap hardware or bolt on external stops during machine commissioning or product changeover. The extruded aluminum barrel includes sensor grooves on both sides for direct mounting of CMSE reed and DMSE electronic sensors, while the variable air cushions at both ends work alongside the rear stopper to decelerate the payload smoothly.
Airtac SAIJ125 Adjustable Cylinder SAIJ125X70-40 Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125X70-40 |
|---|---|
| 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 SAIJ125X70-40
| 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 SAIJ125X70-40 Is Used
Heavy-Duty Press Tuning
Dial in the exact 30-70mm pressing depth during machine setup to accommodate different material thicknesses without changing the cylinder.
Product Size Changeover
Quickly adjust the retract end-stop on a packaging line when switching between product variants, saving valuable reconfiguration time.
Assembly Station Setup
Fine-tune the end position during initial commissioning to achieve perfect alignment, using the rear stopper to set the precise travel limit.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125X70-40 the Right Cylinder?
Choose this 125mm bore when an 80mm bore (providing 2268N pull at 0.5 MPa) cannot generate enough thrust for your heavy-duty clamping or lifting application. The 30-70mm adjustable travel window is ideal for setups requiring variable end-stops without replacing the entire cylinder. Because the stroke is under 300mm, the 32mm rod handles side loads well, though external guides remain best practice for offset loads.
When replacing an ISO 15552 cylinder, match the 125mm bore, 70mm nominal stroke, 40mm adjustment range, PT tapered ports, and the reduced SAIJ mounting set (Basic, FA, LB, TC, FTC, TCM1, TCM2). Note that the rear adjuster is a travel stop, not a lock; the cylinder will not hold its load without live air. For true fail-safe load holding, consider the SAIL or BSAI series instead.
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 SAIJ125X70-40 FAQ
At 0.5 MPa, this 125mm bore cylinder provides 6136N of push force and 5734N of pull force. It operates at a speed range of 30-500 mm/s.
The rear adjuster screw acts as a mechanical stop that lets you shorten the effective travel by up to 40mm, providing a usable stroke window of 30-70mm for fine-tuning the end position without replacing the cylinder.
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