Airtac SAIJ125 Adjustable Cylinder SAIJ125X210-40S
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125X210-40S is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø125mm bore and 210mm 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
- Stroke210 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2
- CushionAdjustable, 40 mm
About the Airtac SAIJ125 Adjustable Cylinder SAIJ125X210-40S
The AirTAC SAIJ125X210-40-S is a double-acting, single-rod ISO 15552 profile cylinder equipped with a rear stroke adjuster. It delivers 6136N of push force at 0.5MPa and features a 170-210mm usable travel window, letting you dial back the nominal 210mm stroke by up to 40mm during commissioning. This built-in adjustability eliminates the need to swap cylinders or bolt on external stoppers when fine-tuning end positions.
As a profile cylinder, it features an extruded aluminum barrel with sensor grooves on both sides. The standard carbon steel rod and M27x2 rod thread provide robust resistance to side loads, while the PT tapered port threads ensure a secure pneumatic connection. It includes a magnet (-S) for use with AirTAC CMSE reed and DMSE electronic sensors, and uses the reduced SAIJ mounting set: Basic, FA, LB, TC, FTC, TCM1, and TCM2.
Airtac SAIJ125 Adjustable Cylinder SAIJ125X210-40S Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125X210-40S |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø125 mm |
| Stroke | 210 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 SAIJ125X210-40S
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 125 | Bore size in mm. |
| ×210 | 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 SAIJ125X210-40S Is Used
Product Changeovers
Dial in the 170-210mm travel window during format size changes on a packaging line without swapping out the entire actuator.
Machine Setup
Fine-tune the retract end-position at commissioning to achieve exact tooling alignment, using the rear screw instead of external stops.
Variable End Stops
Adapt clamping or press operations on the fly by trimming the stroke up to 40mm to accommodate different workpiece heights.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125X210-40S the Right Cylinder?
Choose this 125mm bore when a 100mm cylinder (providing 3927N push at 0.5MPa) lacks the necessary thrust, but a 160mm bore (10053N) would be excessive. The 40mm adjustment range is ideal for product-size changeovers on a line, allowing variable end-stops without replacing the actuator. For any stroke of 210mm, ensure an external guide supports the load to prevent excessive rod wear.
When specifying a replacement, match the 125mm bore, 210mm stroke, 40mm adjustment, PT port threads, and the -S magnet requirement. Remember that the rear adjuster acts only as a travel stop and the air cushions handle deceleration; neither will hold a load without live air. For positive load-holding without pneumatic pressure, consider an AirTAC SAIL lock cylinder, a BSAI clamp-lock, or an external rod lock.
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 SAIJ125X210-40S FAQ
At 0.5MPa operating pressure, this 125mm bore cylinder provides 6136N of push force and 5734N of pull force. At 0.7MPa, the push force increases to 8590N.
The rear adjuster screw allows you to shorten the effective stroke by up to 40mm, creating a 170-210mm usable travel window. It acts as a mechanical stop to set the end position and does not lock the load without live air pressure.
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