Airtac SAIJ125 Adjustable Cylinder SAIJ125X155-30
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125X155-30 is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø125mm bore and 155mm 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
- Stroke155 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2
- CushionAdjustable, 40 mm
About the Airtac SAIJ125 Adjustable Cylinder SAIJ125X155-30
The AirTAC SAIJ125X155-30 is a double-acting, single-rod ISO 15552 profile cylinder equipped with a rear stroke adjuster. It provides a 125 mm to 155 mm usable travel window, allowing you to dial in the exact retract position during commissioning without swapping out the physical unit. In the 125 mm bore class, it delivers a robust 6136 N push force at 0.5 MPa and handles speeds of 30-500 mm/s.
This model features a carbon steel piston rod and PT tapered port threads. The extruded aluminum barrel includes sensor grooves on both sides, ready for CMSE reed or DMSE electronic switches if a magnet is specified later. The rear adjuster acts purely as a travel stop for end-position tuning and does not hold the load without live air pressure.
Airtac SAIJ125 Adjustable Cylinder SAIJ125X155-30 Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125X155-30 |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø125 mm |
| Stroke | 155 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 SAIJ125X155-30
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 125 | Bore size in mm. |
| ×155 | 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 SAIJ125X155-30 Is Used
Product Changeovers
Quickly fine-tune the 125-155 mm retract distance when switching machinery between different product sizes without changing the cylinder.
Heavy Clamping Setup
Delivers 6136 N of clamping thrust at 0.5 MPa, with a rear stopper to perfectly set the grip position during initial machine commissioning.
Variable End Stops
Replaces fixed-stroke actuators on assembly lines where the exact end-of-travel position must be tweaked on the fly for different tooling.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125X155-30 the Right Cylinder?
Select this 125 mm bore cylinder when an application requires heavy thrust (6136 N at 0.5 MPa) alongside precise end-stop variability. If your setup needs less force, stepping down to a 100 mm bore yields 3927 N push force, whereas moving up to a 160 mm bore provides 10053 N. The adjustable 125-155 mm window is ideal for product changeovers, functioning as an internal stop rather than requiring external mechanical bolts.
Because this is a 155 mm stroke, side loads are moderate, but always ensure external guiding for heavy off-center loads. For load-holding without continuous air pressure, this cylinder is insufficient; you must integrate an external pilot-operated check valve or select a related SAIL (air-released lock) or BSAI (clamp-lock) model. Mounting options are limited to 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 SAIJ125X155-30 FAQ
At 0.5 MPa operating pressure, this 125 mm bore cylinder provides 6136 N of push force and 5734 N of pull force. At the maximum 1.0 MPa pressure, it achieves a push force of 12272 N.
The rear adjuster screw allows you to shorten the nominal 155 mm stroke by up to 30 mm, creating a usable travel window of 125 to 155 mm. This stopper only sets the end position; it does not lock the load without live air pressure.
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