Airtac SAIJ125 Adjustable Cylinder SAIJ125X500-100
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125X500-100 is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø125mm bore and 500mm 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
- Stroke500 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2
- CushionAdjustable, 40 mm
About the Airtac SAIJ125 Adjustable Cylinder SAIJ125X500-100
The AirTAC SAIJ125X500-100 is a double-acting ISO 15552 profile cylinder featuring a rear stroke adjuster. It provides a substantial 6136N pull force at 0.5 MPa and uses a 32mm carbon steel rod with M27x2 threading. By turning the rear screw, you can trim the nominal 500mm stroke back by up to 100mm, creating a precise 400-500mm usable travel window without adding external stopper blocks.
This 125mm bore actuator operates at 30-500 mm/s and includes variable air cushions at both ends to decelerate heavy loads. The extruded aluminum barrel integrates sensor grooves on both sides for CMSE reed and DMSE electronic switches, though this standard configuration omits the -S magnet. The adjuster functions strictly as a travel stop to set end positions, meaning it will not hold the load safely without live air pressure.
Airtac SAIJ125 Adjustable Cylinder SAIJ125X500-100 Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125X500-100 |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø125 mm |
| Stroke | 500 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 SAIJ125X500-100
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 125 | Bore size in mm. |
| ×500 | 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 SAIJ125X500-100 Is Used
Variable End-Position Setup
Dial in the exact 400-500mm travel distance during machine commissioning to accommodate varying product lengths without machining new hard stops.
Product Changeover Systems
Quickly adjust the retract end-position by up to 100mm on packaging lines when switching between different package sizes or formats.
Heavy Load Deceleration
Leverage the built-in 40mm air cushions alongside the mechanical stopper to safely bring high-mass actuators moving at up to 500 mm/s to rest.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125X500-100 the Right Cylinder?
Choose this adjustable-stroke model over a fixed SAI cylinder when your application requires frequent product changeovers or commissioning fine-tuning of the end position. If your thrust requirements are lower, stepping down to a 100mm bore yields 3681N pull at 0.5 MPa, whereas stepping up to a 160mm bore provides 9425N. Because the total stroke is 500mm, you must use an external guide to support the load and prevent excessive side-loading on the rod.
For an exact ISO 15552 dimensional replacement, match the 125mm bore, 500mm stroke, and 100mm adjustment range. This unit features PT G1/2 ports, a standard carbon steel rod, and no magnet. It supports a reduced mounting set including Basic, FA, LB, TC, FTC, TCM1, and TCM2. If you need true fail-safe load holding without air pressure, select the SAIL or BSAI series instead of relying on the rear stopper.
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 SAIJ125X500-100 FAQ
The rear adjuster screw acts as a mechanical stop that lets you shorten the effective travel from 500mm down to 400mm. This creates a 400-500mm usable window for fine-tuning end positions at commissioning without swapping the cylinder.
At 0.5 MPa, this cylinder provides 6136N of push force and 5734N of pull force. If operated at the maximum 1.0 MPa pressure, it can deliver up to 1251 kgf of thrust.
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