Airtac SAIJ125 Adjustable Cylinder SAIJ125X150-100STC
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125X150-100STC is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø125mm bore and 150mm 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
- Stroke150 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2
- CushionAdjustable, 40 mm
About the Airtac SAIJ125 Adjustable Cylinder SAIJ125X150-100STC
The AirTAC SAIJ125X150-100-S is a double-acting ISO 15552 profile cylinder with a rear stroke adjuster, built for applications requiring exact end-position tuning. It delivers 6136 N of push force at 0.5 MPa and features a built-in magnet for CMSE reed and DMSE electronic sensors. The rear stopper allows you to dial back the nominal 150 mm stroke by up to 100 mm, creating a wide 50-150 mm usable travel window for product changeovers without swapping the hardware.
This cylinder uses a PT tapered port thread and a robust 32 mm carbon steel rod. It includes adjustable air cushions at both ends to decelerate the moving load, but the adjuster and cushions act only as travel stops—they do not hold the load without live air. For position holding, an external pilot-operated check valve or a SAIL lock cylinder is required.
Airtac SAIJ125 Adjustable Cylinder SAIJ125X150-100STC Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125X150-100STC |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø125 mm |
| Stroke | 150 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 SAIJ125X150-100STC
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 125 | Bore size in mm. |
| ×150 | 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 SAIJ125X150-100STC Is Used
Variable End-Stop Positioning
Dial in the exact retract distance within the 50-150 mm window during machine commissioning to accommodate different material thicknesses without external shims.
Product Changeover Lines
Quickly adjust the stroke stopper when switching the production line to a new product size, leveraging the 100 mm adjustment range to set new end positions in seconds.
High-Force Assembly Presses
Utilize the 6136 N push force at 0.5 MPa for heavy pressing operations, fine-tuning the travel limit to prevent over-travel on delicate components.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125X150-100STC the Right Cylinder?
Choose this 125 mm bore when your application demands high thrust—stepping down to a 100 mm bore drops the 0.5 MPa push force to 3927 N, while stepping up to a 160 mm bore yields 10053 N. The adjustable stroke is ideal for machine setups where the end-stop varies, giving you a 50-150 mm window to fine-tune at commissioning without adding external stops. For load-holding without continuous air pressure, select the SAIL or BSAI series instead, as this rear adjuster is a stop, not a lock.
This model is dimensionally interchangeable per ISO 15552 and includes a TC mounting accessory. It carries the -S magnet for CMSE and DMSE sensors. Although the 150 mm stroke is short, the 32 mm rod and M27x2 thread handle side loads well; for any stroke of 300 mm or more, always use an external guide to prevent rod deflection.
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 SAIJ125X150-100STC FAQ
At a 0.5 MPa operating pressure, this 125 mm bore cylinder provides 6136 N of push force and 5734 N of pull force. At 0.7 MPa, the push force increases to 8590 N.
The rear adjusting screw acts as a mechanical stopper that lets you trim the effective travel back from the 150 mm nominal stroke down to as little as 50 mm. This creates a 50-150 mm usable window for fine-tuning end positions at commissioning without replacing the cylinder.
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