Airtac SAIJ125 Adjustable Cylinder SAIJ125X145-20S
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125X145-20S is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø125mm bore and 145mm 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
- Stroke145 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2
- CushionAdjustable, 40 mm
About the Airtac SAIJ125 Adjustable Cylinder SAIJ125X145-20S
The AirTAC SAIJ125X145-20-S is a double-acting, single-rod ISO 15552 profile cylinder equipped with a rear stroke adjuster. It delivers a robust 6136N pull force at 0.5 MPa and features a standard carbon steel piston rod with PT tapered port threads. The integrated magnet enables position sensing with CMSE reed or DMSE electronic solid-state switches.
With a 145mm nominal stroke and a 20mm adjustment range, this unit provides a usable travel window of 125-145mm. This built-in rear stopper allows you to fine-tune the retract end position during commissioning without adding external stops. The extruded aluminum barrel includes sensor grooves on both sides, and the mounting set covers Basic, FA, LB, TC, FTC, TCM1, and TCM2.
Airtac SAIJ125 Adjustable Cylinder SAIJ125X145-20S Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125X145-20S |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø125 mm |
| Stroke | 145 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 SAIJ125X145-20S
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 125 | Bore size in mm. |
| ×145 | 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 SAIJ125X145-20S Is Used
Product Changeover
Quickly reconfigure the retract end-stop from 145mm down to 125mm during packaging size transitions without disassembling the machine.
Heavy Forming Setup
Leverage the 6136N pull force for stamping or bending tasks while fine-tuning the tooling approach distance at commissioning.
Sensor Calibration
Utilize the -S magnet with DMSE solid-state sensors to track the piston across the adjusted travel window for precise cycle validation.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125X145-20S the Right Cylinder?
Choose this 125mm bore when you need heavy thrust that exceeds the 3927N push force of a 100mm cylinder at 0.5 MPa, but want to avoid the larger footprint and 10053N output of a 160mm unit. The adjustable stroke is ideal for product changeovers on automated lines, allowing you to dial in the exact end-stop without physically swapping the cylinder. Speeds for this bore are 30-500mm/s.
When ordering, confirm the 125mm bore, 145mm stroke, 20mm adjustment, PT port threads, and the -S magnet option. Remember that the rear adjuster acts only as a travel stop and does not hold the load without live air; for true fail-safe load holding, select a SAIL or BSAI cylinder instead.
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 SAIJ125X145-20S FAQ
At 0.5 MPa operating pressure, this 125mm bore cylinder provides 6136N of pull force and 8590N of push force. The maximum operating pressure is 1.0 MPa.
The rear adjuster screw lets you shorten the effective stroke by up to 20mm, creating a usable travel window of 125-145mm. It acts as a mechanical stop to tune the end position and does not lock the load.
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