Airtac SAIJ125 Adjustable Cylinder SAIJ125AX375-50S
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125AX375-50S 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 SAIJ125AX375-50S
The AirTAC SAIJ125X375-50-S is a double-acting ISO 15552 profile cylinder equipped with a rear stroke adjuster, delivering 6136 N push force at 0.5 MPa. Its 375 mm nominal stroke can be dialed back by up to 50 mm, creating a precise 325-375 mm usable travel window for fine-tuning end positions during machine commissioning. This model features a SUS420J2 stainless steel rod, PT tapered port threads, and an integrated magnet for position sensing.
Because the stroke is 375 mm, the 32 mm rod diameter and M27x2 rod thread provide robust support, though an external guide is still recommended to manage side loads on longer travels. The rear adjuster acts purely as a mechanical stop for deceleration and positioning; it does not hold the load without live air. For load-holding requirements without continuous pressure, consider the SAIL or BSAI cylinder series instead.
Airtac SAIJ125 Adjustable Cylinder SAIJ125AX375-50S Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125AX375-50S |
|---|---|
| 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 SAIJ125AX375-50S
| 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 SAIJ125AX375-50S Is Used
Product Changeover Positioning
Dial in the 325-375 mm travel window during format changeovers on packaging lines without replacing the cylinder or adding external stops.
Variable End-Stop Diverter
Fine-tune the retract stroke on a conveyor sorting arm to accommodate different package lengths on the fly.
Machine Setup Calibration
Use the rear adjusting screw to precisely set the retraction end-position during initial commissioning of heavy material handling equipment.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125AX375-50S the Right Cylinder?
Selecting this 125 mm bore over a smaller 100 mm bore steps the thrust up significantly from 3927 N to 6136 N at 0.5 MPa, whereas stepping up to a 160 mm bore yields 10053 N. The 50 mm adjustment range is chosen when a process requires variable end-stops or frequent product-size changeovers, avoiding the need to physically swap cylinders or bolt on external stopper blocks.
As a dimensionally interchangeable ISO 15552 cylinder, it matches standard mounting footprints using the SAIJ subset: Basic, FA, LB, TC, FTC, TCM1, and TCM2 (omitting FB, CA, CB, and CR). The included magnet (-S) works seamlessly with AirTAC CMSE reed and DMSE solid-state sensors mounted in the dual-side extruded barrel grooves. Speeds for this bore range from 30-500 mm/s.
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 SAIJ125AX375-50S 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 pressure, it can deliver up to 1251 kgf.
The rear adjuster screw lets you shorten the 375 mm nominal stroke by up to 50 mm, providing a usable travel window of 325-375 mm. This mechanical stop sets the end position but does not lock or hold the load without live air pressure.
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