Airtac SAIJ125 Adjustable Cylinder SAIJ125X850-40S
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125X850-40S is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø125mm bore and 850mm 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
- Stroke850 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2
- CushionAdjustable, 40 mm
About the Airtac SAIJ125 Adjustable Cylinder SAIJ125X850-40S
The AirTAC SAIJ125X850-40-S is a double-acting ISO 15552 profile cylinder equipped with a rear stroke adjuster. It delivers a robust 6136N push force at 0.5 MPa and features a built-in magnetic piston for position detection. The carbon steel rod measures 32mm with an M27x2 thread, paired with a PT G1/2 port for high flow. An 850mm nominal stroke is paired with a 40mm adjustment range, yielding a usable travel window of 810 to 850mm.
This adjustable stop allows you to fine-tune the retract end position during commissioning or product changeovers without swapping out the cylinder. The extruded aluminum barrel includes sensor grooves on both sides, compatible with AirTAC CMSE reed and DMSE electronic switches. It supports a speed range of 30-500 mm/s and includes variable air cushions at both ends to manage kinetic energy.
Airtac SAIJ125 Adjustable Cylinder SAIJ125X850-40S Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125X850-40S |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø125 mm |
| Stroke | 850 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 SAIJ125X850-40S
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 125 | Bore size in mm. |
| ×850 | 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 SAIJ125X850-40S Is Used
Variable-Length Cutting
Dial in the 810-850mm retract stop to quickly change cut lengths on a production line without physically swapping cylinders or repositioning hard stops.
Assembly Press Tuning
Fine-tune the end-of-stroke position during machine commissioning to apply the 6136N push force at the exact height required for pressing bearings.
Product Size Changeovers
Adapt automated packaging equipment to different carton sizes by adjusting the stroke window rather than replacing the entire ISO 15552 actuator.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125X850-40S the Right Cylinder?
Choose this 125mm bore when your application requires substantial thrust—stepping down to a 100mm bore drops the 0.5 MPa push force to 3927N, while a larger 160mm bore offers 10053N. The SAIJ125X850-40-S is specified when you need an 810-850mm travel window to accommodate varying product sizes on a single line, avoiding the need for fixed-stroke SAI cylinders and external stops.
For an exact ISO 15552 replacement, match the 125mm bore, 850mm stroke, 40mm adjustment, PT G1/2 port, and -S magnet. Because the 850mm stroke is long, an external guide rail is recommended to prevent excessive side-loading on the 32mm rod. Note that the rear adjuster and air cushions only set the travel end and deceleration; they do not hold the load without live air. For dead-load holding, use an external rod lock or pilot-operated check valve. Mounting options include Basic, FA, LB, TC, FTC, TCM1, and TCM2.
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 SAIJ125X850-40S 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 delivers up to 1251 kgf.
The rear adjuster screw acts as a mechanical stop that lets you shorten the effective stroke from 850mm down to 810mm. It sets the travel end and deceleration point but does not lock the load without continuous air pressure.
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