Airtac SAIJ125 Adjustable Cylinder SAIJ125X150-40S
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125X150-40S is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø125mm bore and 150mm 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
- Stroke150 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2
- CushionAdjustable, 40 mm
About the Airtac SAIJ125 Adjustable Cylinder SAIJ125X150-40S
The AirTAC SAIJ125X150-40-S is a double-acting ISO 15552 profile cylinder equipped with a rear stroke adjuster, enabling you to fine-tune the end-of-travel position during commissioning. It provides a usable travel window of 110-150 mm, letting you shorten the nominal 150 mm stroke by up to 40 mm without adding external stops. Delivering 6136 N of push force at 0.5 MPa, it suits heavy-duty positioning tasks.
This -S variant includes a piston magnet for position sensing via AirTAC CMSE reed or DMSE electronic solid-state switches. The extruded aluminum barrel features sensor grooves on both sides, and the unit omits FB, CA, CB, and CR mounts, supporting only Basic, FA, LB, TC, FTC, TCM1, and TCM2 attachments.
Airtac SAIJ125 Adjustable Cylinder SAIJ125X150-40S Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125X150-40S |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø125 mm |
| Stroke | 150 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 SAIJ125X150-40S
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 125 | Bore size in mm. |
| ×150 | 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 SAIJ125X150-40S Is Used
Product Changeover
Dial in the 110-150 mm travel window during format changes on a packaging line, accommodating different carton sizes without swapping hardware.
Heavy Pressing
Apply up to 6136 N of force at 0.5 MPa for seating bearings or heavy components, using the adjustable stopper to prevent over-travel.
Variable End Stops
Set precise retract positions on automated assembly machinery, fine-tuning the 150 mm stroke by up to 40 mm during initial commissioning.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125X150-40S the Right Cylinder?
Choose this 125 mm bore when a 100 mm bore (offering 3927 N at 0.5 MPa) cannot generate enough push force, but you want to avoid stepping up to a 160 mm unit. The adjustable rear stopper is ideal for machines processing varying product sizes, allowing you to dial in the exact end position on the fly instead of physically swapping out a fixed-stroke SAI cylinder.
For ISO 15552 replacement matching, specify a 125 mm bore, 150 mm stroke, 40 mm adjustment range, PT tapered port threads, and the -S magnet option. Because the rear adjuster and air cushions only decelerate the load, this cylinder will not hold position without live air pressure; for true load-holding, consider an external rod lock, an SAIL air-released lock, or a BSAI clamp-lock cylinder.
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 SAIJ125X150-40S FAQ
At 0.5 MPa it provides 6136 N of push force and 5734 N of pull force. At the maximum operating pressure of 1.0 MPa, the push force reaches 11045 N.
The external rear screw acts as a mechanical stop, allowing you to trim the effective travel back from the 150 mm nominal stroke down to 110 mm, creating a 110-150 mm usable window for fine-tuning.
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