Airtac SAIJ125 Adjustable Cylinder SAIJ125X100-40S
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125X100-40S is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø125mm bore and 100mm 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
- Stroke100 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2
- CushionAdjustable, 40 mm
About the Airtac SAIJ125 Adjustable Cylinder SAIJ125X100-40S
The AirTAC SAIJ125X100-40-S is a double-acting, single-rod ISO 15552 profile cylinder equipped with a rear stroke adjuster. It delivers 6136N of push force at 0.5 MPa and features a 100mm nominal stroke that can be fine-tuned down by up to 40mm, creating a precise 60-100mm usable travel window. This built-in adjustability allows operators to dial in exact end positions during commissioning without adding external stops.
This model includes a magnetic piston (-S) for position sensing and uses a standard carbon steel rod. The extruded aluminum barrel incorporates sensor grooves on both sides, directly supporting AirTAC CMSE reed and DMSE electronic solid-state switches. It operates at 30-500mm/s and relies on adjustable air cushions at both ends to decelerate the load smoothly.
Airtac SAIJ125 Adjustable Cylinder SAIJ125X100-40S Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125X100-40S |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø125 mm |
| Stroke | 100 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 SAIJ125X100-40S
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 125 | Bore size in mm. |
| ×100 | 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 SAIJ125X100-40S Is Used
Product Changeover Tuning
Quickly adjust the 60-100mm travel window during packaging line format changes to accommodate different carton sizes without swapping hardware.
End-Position Calibration
Fine-tune the retract stroke during machine commissioning to achieve exact material clamping positions, preventing crush damage to delicate workpieces.
Variable Stop Assembly
Use the rear stopper screw to set intermediate stopping points in heavy-duty assembly presses, leveraging the 6136N push force for reliable actuation.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125X100-40S the Right Cylinder?
Choose this 125mm bore when an application requires substantial thrust, such as 6136N push or 5734N pull at 0.5 MPa. If your force requirements are lower, stepping down to a 100mm bore yields 3927N push force, whereas upgrading to a 160mm bore provides 10053N. The adjustable stroke is selected over a fixed SAI cylinder when a machine requires variable end-stops or frequent product-size changeovers. For any stroke of 300mm or more, external guide rails should be fitted to support the load and prevent excessive side-loading on the rod.
This SAIJ125X100-40-S is dimensionally interchangeable per ISO 15552. To match this exact replacement, confirm: 125mm bore, 100mm stroke, 40mm adjustment, PT tapered port threads, a carbon steel rod, and the -S magnet option. Note that the rear adjuster acts only as a travel stop and does not hold the load without live air; for fail-safe load holding, consider an AirTAC SAIL or BSAI locking cylinder. 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 SAIJ125X100-40S 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 achieves a push force of 1251 kgf.
The rear adjuster screw allows you to shorten the 100mm nominal stroke by up to 40mm, providing a usable travel window of 60-100mm. This stopper decelerates the piston via the air cushion but does not lock the load without continuous air pressure.
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