Airtac SAIJ125 Adjustable Cylinder SAIJ125X45-20
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125X45-20 is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø125mm bore and 45mm 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
- Stroke45 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2
- CushionAdjustable, 40 mm
About the Airtac SAIJ125 Adjustable Cylinder SAIJ125X45-20
The AirTAC SAIJ125X45-20 is a double-acting, single-rod ISO 15552 profile cylinder equipped with a rear stroke adjuster. It delivers 6136N of push force at 0.5MPa and features a 25-45mm usable travel window, allowing you to trim the 45mm nominal stroke by up to 20mm during commissioning. This built-in stopper eliminates the need to swap cylinders or bolt on external hardware to fine-tune the end position.
This model uses a PT tapered port thread and a robust 32mm carbon steel rod with an M27x2 thread, providing high rigidity against side loads. The extruded aluminum barrel includes sensor grooves on both sides for CMSE reed or DMSE electronic switches, though this specific SKU is configured without a magnet. It supports a reduced set of ISO 15552 mountings: Basic, FA, LB, TC, FTC, TCM1, and TCM2.
Airtac SAIJ125 Adjustable Cylinder SAIJ125X45-20 Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125X45-20 |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø125 mm |
| Stroke | 45 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 SAIJ125X45-20
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 125 | Bore size in mm. |
| ×45 | 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 SAIJ125X45-20 Is Used
Heavy Clamping Positioning
Dial in the exact 25-45mm clamping depth on heavy fixtures without machining custom stopper blocks.
Short-Stroke Changeover
Quickly adjust the end-stop distance during product size changeovers on automated assembly lines.
Press Fit Tuning
Fine-tune the bottoming position of a press operation at commissioning to prevent component damage.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125X45-20 the Right Cylinder?
Choose this 125mm bore when you need heavy thrust (6136N push at 0.5MPa) but require precise end-position tuning for short-stroke tasks; if you need less force, stepping down to an 80mm bore yields 2513N. The adjustable rear screw is strictly a travel stop, not a lock, so it cannot hold a load without live air. For positive load-holding without pressure, select an AirTAC SAIL or BSAI cylinder instead. To match this ISO 15552 interchangeable cylinder, confirm your 125mm bore, 45mm stroke, 20mm adjustment, PT port, and mounting style.
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 SAIJ125X45-20 FAQ
At 0.5MPa operating pressure, this 125mm bore cylinder provides 6136N of push force and 5734N of pull force. It can reach up to 11045N push at 0.9MPa.
The rear adjuster acts as a mechanical stop that lets you shorten the 45mm nominal stroke by up to 20mm, creating a usable travel window of 25-45mm. It only sets the end position and does not lock the load without live air pressure.
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