Airtac SAIJ125 Adjustable Cylinder SAIJ125AX115-30S
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125AX115-30S is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø125mm bore and 115mm 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
- Stroke115 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2
- CushionAdjustable, 40 mm
About the Airtac SAIJ125 Adjustable Cylinder SAIJ125AX115-30S
The AirTAC SAIJ125X115-30-S is a double-acting, single-rod ISO 15552 profile cylinder equipped with a rear stroke adjuster. It provides a usable travel window of 85 to 115 mm, allowing you to dial back the nominal 115 mm stroke by up to 30 mm during commissioning. Delivering 6136 N of push force at 0.5 MPa, it handles heavy positioning tasks without needing external stops. The extruded aluminum barrel features sensor grooves on both sides, and this -S variant includes a magnet for CMSE reed and DMSE electronic sensors.
This model uses a SUS420J2 stainless steel rod for improved corrosion resistance and features PT tapered port threads. The rear adjuster acts purely as a mechanical stop to set the end position; it does not hold the load without live air pressure. For applications requiring true load-holding, consider the SAIL or BSAI series instead.
Airtac SAIJ125 Adjustable Cylinder SAIJ125AX115-30S Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125AX115-30S |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø125 mm |
| Stroke | 115 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 SAIJ125AX115-30S
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 125 | Bore size in mm. |
| ×115 | 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 SAIJ125AX115-30S Is Used
Machine Setup & Changeover
Fine-tune the 85-115 mm travel window on the fly during product size transitions without machining new hard stops.
Variable End-Stop Positioning
Dial in the exact retract distance for multi-format assembly lines using the 30 mm rear adjustment screw.
Heavy-Duty Clamping
Leverage 6136 N of thrust at 0.5 MPa to secure heavy workpieces while the adjuster sets the precise clamp depth.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125AX115-30S the Right Cylinder?
Select this 125 mm bore cylinder when a machine requires high thrust—up to 6136 N at 0.5 MPa—combined with variable end-stop positioning. If your application needs less force, stepping down to an 80 mm bore yields 2513 N at 0.5 MPa, whereas moving up to a 160 mm bore provides 10053 N. Choose this adjustable-stroke SAIJ over a fixed-stroke SAI when you need fine end-position tuning during product changeovers without swapping the cylinder.
To match this ISO 15552 cylinder for a replacement, verify the 125 mm bore, 115 mm stroke, 30 mm adjustment range, PT port threads, and the integrated magnet. Because the stroke is under 300 mm, side-load stress on the 32 mm rod is manageable, but an external guide is still recommended for heavy lateral loads. 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 SAIJ125AX115-30S FAQ
At 0.5 MPa operating pressure, this 125 mm bore cylinder provides 6136 N of push force and 5734 N of pull force. At the maximum 1.0 MPa, it delivers up to 1251 kgf.
The rear adjuster screw lets you mechanically shorten the 115 mm nominal stroke by up to 30 mm, creating an 85-115 mm usable travel window. It functions as a travel stop and does not lock or hold the load without continuous air pressure.
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