Airtac SAIJ125 Adjustable Cylinder SAIJ125X85-40S
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125X85-40S 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 SAIJ125X85-40S
The AirTAC SAIJ125X85-40-S is a double-acting ISO 15552 profile cylinder featuring a rear stroke adjuster that allows you to fine-tune the travel window from 45 to 85 mm. It delivers 6136 N of pull force at 0.5 MPa, making it suitable for heavy-duty positioning tasks.
This variant includes a piston magnet for use with CMSE reed and DMSE electronic sensors. It features a carbon steel rod, PT tapered ports, and air cushions at both ends to manage deceleration. The rear adjuster acts purely as a mechanical stop and does not hold the load without live air pressure.
Airtac SAIJ125 Adjustable Cylinder SAIJ125X85-40S Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125X85-40S |
|---|---|
| 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 SAIJ125X85-40S
| 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 SAIJ125X85-40S Is Used
Variable End-Stop Positioning
Dial in the exact 45 to 85 mm travel distance during machine setup to accommodate varying workpiece sizes without replacing the cylinder.
Product Line Changeover
Quickly adjust the rear stopper on the fly when switching production runs, minimizing downtime and avoiding the need for external mechanical stops.
Heavy-Duty Assembly Press
Leverage the 6136 N pull force at 0.5 MPa for robust assembly operations while using the rear adjuster to tune the final pressing depth.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125X85-40S the Right Cylinder?
Choose this 125 mm bore cylinder when an application requires substantial thrust, such as 8590 N of push force at 0.7 MPa, but demands an adjustable end-position for product changeovers. If your process requires less force, stepping down to a 100 mm bore yields 3681 N of pull force at 0.5 MPa.
The 40 mm adjustment range allows precise variable end-stops without adding external stops or swapping out a fixed-stroke SAI cylinder. For ISO 15552 replacement matching, verify the 85 mm stroke, 40 mm adjuster, PT port threads, and the -S magnet option. Note that the SAIJ mounting set includes Basic, FA, LB, TC, FTC, TCM1, and TCM2, omitting FB, CA, CB, and CR.
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 SAIJ125X85-40S FAQ
The rear adjuster is a mechanical stopper that allows you to shorten the effective stroke by up to 40 mm. This provides a usable travel window of 45 to 85 mm, which is set mechanically during commissioning and does not hold the load without live air pressure.
At an operating pressure of 0.5 MPa, it provides 6136 N of push force and 5734 N of pull force. At 0.7 MPa, the push force increases to 8590 N.
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