Airtac SAIJ125 Adjustable Cylinder SAIJ125X375-75S
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125X375-75S is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø125mm bore and 375mm 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
- Stroke375 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2
- CushionAdjustable, 40 mm
About the Airtac SAIJ125 Adjustable Cylinder SAIJ125X375-75S
The AirTAC SAIJ125X375-75-S is a double-acting ISO 15552 profile cylinder equipped with a rear stroke adjuster. It delivers a robust 8590N pull force at 0.7 MPa and features a built-in magnet for position sensing. The extruded aluminum barrel includes sensor grooves on both sides, seamlessly accommodating CMSE reed and DMSE electronic solid-state switches for precise feedback.
This specific SKU provides a 375mm nominal stroke that can be dialed back by up to 75mm, creating a 300-375mm usable travel window. This built-in adjustment allows you to fine-tune the retract end-position during commissioning or product changeovers without swapping the cylinder or bolting on external stops. The 32mm carbon steel piston rod and M27x2 thread provide substantial structural rigidity for heavy loads.
Airtac SAIJ125 Adjustable Cylinder SAIJ125X375-75S Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125X375-75S |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø125 mm |
| Stroke | 375 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 SAIJ125X375-75S
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 125 | Bore size in mm. |
| ×375 | 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 SAIJ125X375-75S Is Used
Variable End-Stop Machining
Dial in the exact 300-375mm retract position for machining different part depths without changing out the physical cylinder or adding mechanical shims.
Product Changeover Diverter
Quickly adjust the stroke window on a packaging line diverter to accommodate varying package lengths during rapid product format changes.
Heavy Assembly Press
Leverage the 8590N pull force to seat heavy components, using the rear stopper to fine-tune the final pressing depth at machine setup.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125X375-75S the Right Cylinder?
Choose this 125mm bore when a 100mm bore falls short of the required thrust, as the 100mm version only yields 3681N of pull force at 0.7 MPa compared to this model's 8590N. The adjustable stroke is ideal for variable end-stop setups, but note that the rear adjuster acts purely as a travel stop and does not hold the load without live air pressure. For true load-holding requirements without continuous air, consider an SAIL air-released lock, a BSAI clamp-lock, or an external rod lock.
As a dimensionally interchangeable ISO 15552 cylinder, it matches replacements by specifying a 125mm bore, 375mm stroke, 75mm adjustment, PT tapered port threads, and the -S magnet option. Mounting options include the reduced SAIJ set of Basic, FA, LB, TC, FTC, TCM1, and TCM2, omitting FB, CA, CB, and CR. Because the 375mm stroke creates a long unsupported rod extension, an external guide is recommended to prevent excessive side-loading and premature seal wear.
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 SAIJ125X375-75S FAQ
At an operating pressure of 0.7 MPa, this 125mm bore cylinder generates 8590N of pull force and 8590N of push force. At the maximum 1.0 MPa pressure, it can deliver up to 1251 kgf.
The rear adjuster screw lets you shorten the effective travel from 375mm down to 300mm. It functions only as a mechanical travel stop to set the end position and does not lock or hold the load without continuous air pressure.
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