Airtac SAIJ125 Adjustable Cylinder SAIJ125X500-30S
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125X500-30S 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 SAIJ125X500-30S
The AirTAC SAIJ125X500-30-S is a double-acting ISO 15552 profile cylinder equipped with a rear stroke adjuster, allowing you to dial back the 500 mm nominal stroke by up to 30 mm. This yields a precise 470-500 mm usable travel window, perfect for fine-tuning end positions during machine commissioning without swapping out the entire actuator. It delivers robust thrust, pushing 6136 N and pulling 5734 N at 0.5 MPa.
This model features a carbon steel piston rod and a PT tapered port thread. The integrated -S magnet enables position sensing via AirTAC CMSE reed or DMSE electronic solid-state switches seated in the dual-side sensor grooves. Because the 500 mm stroke is unsupported, the 32 mm rod diameter should be paired with an external guide to manage side loads. The rear stopper sets the travel end but does not lock the load without live air pressure.
Airtac SAIJ125 Adjustable Cylinder SAIJ125X500-30S Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125X500-30S |
|---|---|
| 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 SAIJ125X500-30S
| 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 SAIJ125X500-30S Is Used
Product Size Changeovers
Dial in the 470-500 mm travel window during line changeovers to accommodate different product lengths without physically replacing the cylinder or adding external mechanical stops.
Heavy Press Positioning
Leverage the 6136 N push force at 0.5 MPa to move heavy assemblies, using the rear screw to precisely set the final clamping position during machine commissioning.
Automated Material Handling
Drive large pallet transfers over a 500 mm stroke, relying on the -S magnet and DMSE electronic sensors to confirm end-of-travel positions for the PLC.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125X500-30S the Right Cylinder?
Selecting this 125 mm bore actuator makes sense when your application requires the 6136 N push force at 0.5 MPa and a variable end-stop. If your setup needs less force, stepping down to a 100 mm bore provides 3927 N; if you need more power, a 160 mm bore yields 10053 N. The adjustable-stroke design is chosen over a fixed SAI cylinder when you need on-the-fly end-position tuning for product size changeovers. To match this exact unit for an ISO 15552 replacement, specify the 125 mm bore, 500 mm stroke, 30 mm adjustment, PT port thread, carbon steel rod, and the -S magnet option.
For any stroke of 500 mm, preventing rod sag and side-load damage is critical, so always use an external guide rail. Remember that the rear adjuster and the variable air cushions only decelerate the travel end; they do not function as a brake. If your machine must hold a load without continuous air pressure, integrate an external rod lock or pilot-operated check valve, or select an AirTAC SAIL or BSAI cylinder.
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 SAIJ125X500-30S FAQ
At 0.5 MPa operating pressure, this 125 mm bore cylinder provides a push force of 6136 N and a pull force of 5734 N. At 0.7 MPa, the push force increases to 8590 N.
The rear adjuster acts as a mechanical stop that allows you to shorten the 500 mm nominal stroke by up to 30 mm, creating a 470-500 mm usable travel window. It only sets the end position and does not lock the load without live air pressure.
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