Airtac SAIJ125 Adjustable Cylinder SAIJ125X500-20
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125X500-20 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 SAIJ125X500-20
The AirTAC SAIJ125X500-20 is a double-acting, single-rod ISO 15552 profile cylinder equipped with a rear stroke adjuster. It delivers a robust 6136N of push force at 0.5 MPa and features a 500mm nominal stroke that can be fine-tuned down by 20mm, yielding a usable travel window of 480-500mm. This built-in adjustability allows you to dial in the exact retract end position during commissioning without swapping out the entire unit.
Constructed with an extruded aluminum barrel and a carbon steel piston rod, this model utilizes PT tapered port threads (G1/2) and operates at speeds between 30-500mm/s. The rear adjustment screw functions purely as a mechanical stop to set the travel limit, working in tandem with the variable air cushions at both ends to decelerate the load. It does not lock or hold the load without continuous live air pressure.
Airtac SAIJ125 Adjustable Cylinder SAIJ125X500-20 Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125X500-20 |
|---|---|
| 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 SAIJ125X500-20
| 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 SAIJ125X500-20 Is Used
Machine Changeover
Quickly fine-tune the 480-500mm retract position by up to 20mm during product size changeovers without bolting on external stops.
Heavy Material Handling
Leverage the 6136N push force at 0.5 MPa to move heavy workpieces while using the rear adjuster to set precise end-of-stroke limits.
Assembly Station Setup
Dial in the exact clamping distance during initial commissioning, using the rear screw to compensate for mechanical tolerances.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125X500-20 the Right Cylinder?
Selecting this 125mm bore cylinder makes sense when your application requires the 6136N push force at 0.5 MPa and on-the-fly end-position tuning. If you need less force, stepping down to a 100mm bore provides 3927N; if you require more, a 160mm bore yields 10053N. Choose this adjustable-stroke SAIJ variant over a fixed-stroke SAI when you anticipate product changeovers or need to micro-adjust the 480-500mm travel window during machine setup. To match this cylinder for an ISO 15552 replacement, specify the 125mm bore, 500mm stroke, 20mm adjustment, PT port threads, carbon steel rod, and no magnet.
Because this model features a 500mm stroke, the extended rod is subject to increased side-loading risks. Even with a substantial 32mm rod diameter and M27x2 rod thread, you must use an external guide to prevent excessive wear and binding over long travel distances. For applications requiring true load-holding without live air, consider the SAIL pneumatic lock or BSAI clamp-lock 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 SAIJ125X500-20 FAQ
At 0.5 MPa operating pressure, this 125mm bore cylinder provides 6136N of push force and 5734N of pull force. At the maximum 1.0 MPa pressure, it can deliver up to 1251 kgf.
The rear adjuster acts as a mechanical stop that allows you to shorten the 500mm nominal stroke by up to 20mm, creating a 480-500mm usable travel window. It only sets the end position and does not hold the load without live air pressure.
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