Airtac SAIJ125 Adjustable Cylinder SAIJ125X700-20
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125X700-20 is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø125mm bore and 700mm 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
- Stroke700 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2
- CushionAdjustable, 40 mm
About the Airtac SAIJ125 Adjustable Cylinder SAIJ125X700-20
The AirTAC SAIJ125X700-20 is a double-acting ISO 15552 profile cylinder featuring a rear stroke adjuster. It provides a usable travel window of 680 to 700 mm, letting you dial back the end position by up to 20 mm during commissioning without adding external stops. It delivers a robust 6136 N push force at 0.5 MPa, scaling up to 11045 N at 0.9 MPa.
This model uses a carbon steel piston rod and PT tapered port threads. The extruded aluminum barrel includes sensor grooves on both sides for CMSE reed or DMSE electronic switches, though no magnet is specified for this configuration. The rear adjuster acts purely as a travel stop for deceleration, meaning it will not hold a load without live air pressure.
Airtac SAIJ125 Adjustable Cylinder SAIJ125X700-20 Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125X700-20 |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø125 mm |
| Stroke | 700 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 SAIJ125X700-20
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 125 | Bore size in mm. |
| ×700 | 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 SAIJ125X700-20 Is Used
Heavy Press Tuning
Fine-tune the 700 mm extend position by up to 20 mm during machine setup to perfectly align heavy pressing loads without external stopper blocks.
Product Size Changeovers
Adjust the end-stop within the 680-700 mm window to accommodate varying product lengths on a packaging line during rapid format changes.
Long-Stroke Material Handling
Shift heavy pallets or chassis using 6136 N of push force at 0.5 MPa, relying on the rear screw to set the exact retract deceleration point.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125X700-20 the Right Cylinder?
Choose this 125 mm bore when an 80 mm bore (2513 N push at 0.5 MPa) is insufficient for moving heavy assemblies. The adjustable 680-700 mm window is ideal for product-size changeovers on a line, offering variable end-stops without swapping the cylinder. For true load-holding without live air, consider an AirTAC SAIL or BSAI cylinder instead, as the SAIJ adjuster is not a lock.
As an ISO 15552 profile cylinder, it is dimensionally interchangeable with standard mounting interfaces. The SAIJ series supports a reduced mounting set: Basic, FA, LB, TC, FTC, TCM1, and TCM2, omitting FB, CA, CB, and CR. Because the stroke is 700 mm, the 32 mm rod needs external guidance to prevent side-load damage over this long unsupported travel.
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 SAIJ125X700-20 FAQ
At 0.5 MPa it provides 6136 N of push force and 5734 N of pull force. If you increase the operating pressure to 0.9 MPa, the push force scales to 11045 N.
The rear adjuster screw lets you shorten the nominal 700 mm stroke by up to 20 mm, creating a 680-700 mm usable travel window. It functions as an end-position stop for commissioning, not as a load-holding lock.
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