Airtac SAIJ125 Adjustable Cylinder SAIJ125X85-30
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125X85-30 is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø125mm bore and 85mm 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
- Stroke85 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2
- CushionAdjustable, 40 mm
About the Airtac SAIJ125 Adjustable Cylinder SAIJ125X85-30
The AirTAC SAIJ125X85-30 is a double-acting ISO 15552 profile cylinder equipped with a rear stroke adjuster, delivering a robust 6136N push and 5734N pull force at 0.5 MPa. By integrating a 30mm adjustment mechanism, this unit enables you to dial the effective travel down from its 85mm nominal length, creating a precise 55-85mm usable stroke window for exact end-position tuning during commissioning.\n\nThis model features a carbon steel piston rod with an M27x2 thread and a PT tapered G1/2 port. The extruded aluminum barrel incorporates sensor grooves on both sides, allowing you to mount CMSE reed or DMSE electronic solid-state sensors for position feedback. It utilizes a reduced mounting interface subset of Basic, FA, LB, TC, FTC, TCM1, and TCM2, omitting the FB, CA, CB, and CR options found on other variants.
Airtac SAIJ125 Adjustable Cylinder SAIJ125X85-30 Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125X85-30 |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø125 mm |
| Stroke | 85 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 SAIJ125X85-30
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 125 | Bore size in mm. |
| ×85 | 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 SAIJ125X85-30 Is Used
Product Changeover
Dial in the 55-85mm travel window on the fly to accommodate varying package lengths on a packaging line without changing the cylinder.
Machine Setup
Fine-tune the exact retract end-position during initial commissioning to perfectly align heavy 125mm bore tooling.
Variable End Stops
Use the 30mm rear adjustment screw to set precise mechanical stops for machining operations requiring different material thicknesses.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125X85-30 the Right Cylinder?
Selecting this 125mm bore over a 100mm variant steps up your thrust significantly, moving from 3927N to 6136N at 0.5 MPa to handle heavier actuation demands. You would choose this adjustable-stroke model over a fixed SAI cylinder when you need variable end-stops to accommodate product size changes on a line without physically swapping the actuator.\n\nWhen configuring your setup, note that the rear adjuster functions strictly as a travel stop to decelerate the load, not as a locking mechanism; a plain SAIJ will not hold its position without live air pressure. For load-holding without continuous pressure, consider the SAIL pneumatic lock or BSAI clamp-lock series. The 85mm stroke is well below the 1500mm maximum standard stroke for this bore, keeping the 32mm rod highly stable without requiring external guides.
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 SAIJ125X85-30 FAQ
The rear adjuster acts as an external stopper that lets you shorten the effective stroke by up to 30mm. This provides a usable travel window of 55-85mm, allowing you to fine-tune the retract end position without adding external stops.
At 0.5 MPa operating pressure, it provides 6136N of push force and 5734N of pull force. At the maximum 1.0 MPa pressure, it can deliver up to 1251 kgf.
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Covers non-human-caused product damage.
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Standard models usually ship in 3-4 days.
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