Airtac SAIJ125 Adjustable Cylinder SAIJ125AX125-40S
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125AX125-40S is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø125mm bore and 125mm 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
- Stroke125 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2
- CushionAdjustable, 40 mm
About the Airtac SAIJ125 Adjustable Cylinder SAIJ125AX125-40S
The AirTAC SAIJ125X125-40-S is a double-acting, single-rod ISO 15552 profile cylinder equipped with a rear stroke adjuster. It delivers a robust 6136N push force at 0.5 MPa and features a 125mm nominal stroke that can be fine-tuned down by up to 40mm, creating an exact 85-125mm usable travel window. This built-in adjustability allows operators to dial in retract end positions during commissioning without adding external stops.
This SKU includes a SUS420J2 stainless steel rod (code A) for superior corrosion resistance and carries the -S magnet option for seamless integration with AirTAC CMSE reed and DMSE electronic sensors. The extruded aluminum barrel incorporates sensor grooves on both sides, and the unit operates at speeds between 30-500mm/s. It uses a PT tapered G1/2 port and provides variable air cushioning at both ends to decelerate heavy loads smoothly.
Airtac SAIJ125 Adjustable Cylinder SAIJ125AX125-40S Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125AX125-40S |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø125 mm |
| Stroke | 125 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 SAIJ125AX125-40S
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 125 | Bore size in mm. |
| ×125 | 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 SAIJ125AX125-40S Is Used
Machine Changeover
Quickly adjust the 85-125mm travel window during product size changeovers without swapping the cylinder or repositioning hard stops.
Precision End-Positioning
Fine-tune the retract stroke by up to 40mm during commissioning to achieve exact end-of-travel positioning for high-force assembly tasks.
Heavy Load Deceleration
Leverage the variable air cushions at both ends alongside the rear stopper to safely decelerate 6136N loads at up to 500mm/s.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125AX125-40S the Right Cylinder?
Select this 125mm bore cylinder when an application requires high thrust (6136N push at 0.5 MPa) alongside variable end-stop positioning. If you need less force, stepping down to a 100mm bore yields 3927N push force, whereas upgrading to a 160mm bore provides 10053N. Choose the SAIJ adjustable-stroke format over a fixed SAI model when you anticipate product changeovers or need to trim the retract position on the fly. To replace this cylinder, match the 125mm bore, 125mm stroke, 40mm adjustment, PT G1/2 port, and -S magnet.
Because the nominal stroke is 125mm, an external guide is recommended to manage side loads, despite the robust 32mm rod and M27x2 thread. Remember that the rear adjuster acts only as a travel stop, not a lock; the SAIJ cannot hold a load without live air pressure. For secure load-holding, consider an AirTAC SAIL pneumatic lock or BSAI clamp-lock cylinder. Mounting options are limited to 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 SAIJ125AX125-40S 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 can deliver up to 1251 kgf.
The rear adjuster screw allows you to shorten the effective stroke by up to 40mm from the 125mm nominal length, providing an 85-125mm usable travel window. It functions as a mechanical stop to set the end position and does not lock the load without continuous air pressure.
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