Airtac SAIJ63 Adjustable Stroke Air Cylinder SAIJ63AX125-75
The AirTAC Airtac SAIJ63 Adjustable Stroke Air Cylinder SAIJ63AX125-75 is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø63mm bore and 125mm stroke, G3/8 air ports and adjustable end cushioning. Its standardized mounting interface makes it a drop-in replacement for other ISO 15552 cylinders in automation lines.
- BoreØ63 mm
- Stroke125 mm
- Port sizeG3/8
- Acting typeDouble acting
- Rod threadM16×1.5
- CushionAdjustable, 36 mm
About the Airtac SAIJ63 Adjustable Stroke Air Cylinder SAIJ63AX125-75
The AirTAC SAIJ63X125-75 is a double-acting ISO 15552 profile cylinder featuring a rear stroke adjuster that allows you to trim the effective travel. With a nominal 125 mm stroke and a 75 mm adjustment range, it provides a highly flexible 50-125 mm usable travel window for precise end-position tuning at commissioning. It delivers a robust 1559 N push force at 0.5 MPa, making it suitable for moderate to heavy actuation tasks.
This variant uses a SUS420J2 stainless steel rod (material code A) for improved corrosion resistance over standard carbon steel. The rear adjuster acts purely as a mechanical stop to set the retract position and cannot hold the load without live air pressure. It features PT tapered port threads (G3/8) and variable air cushions at both ends to decelerate the piston, while the extruded aluminum barrel includes sensor grooves on both sides for flexible switch placement.
Airtac SAIJ63 Adjustable Stroke Air Cylinder SAIJ63AX125-75 Technical Specifications
| Model | Airtac SAIJ63 Adjustable Stroke Air Cylinder SAIJ63AX125-75 |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø63 mm |
| Stroke | 125 mm |
| Acting type | Double acting |
| Port size | G3/8 |
| Rod thread | M16×1.5 |
| 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 – 800 mm/s |
| Cushion | Adjustable, 36 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 (Ø63mm)
| Pressure | Push force | Pull force |
|---|---|---|
| 0.5 MPa | 1559 N | 1402 N |
| 0.7 MPa | 2182 N | — |
| Max (@1.0 MPa) | 318 kgf | |
Actual usable force is lower than theoretical due to friction and back-pressure. Size with a safety margin.
Model Code: Airtac SAIJ63 Adjustable Stroke Air Cylinder SAIJ63AX125-75
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 63 | Bore size in mm. |
| ×125 | 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 SAIJ63 Adjustable Stroke Air Cylinder SAIJ63AX125-75 Is Used
Variable End-Stop Tuning
Dial in the exact retract position within a 50-125 mm window during machine commissioning without physically relocating the cylinder mount.
Product Changeover
Quickly adapt the stroke length on a packaging line when handling different carton sizes, using the 75 mm adjustment range to accommodate new formats.
Assembly Line Setup
Set precise end-of-stroke positions for pressing or locating tasks, leveraging the 1559 N output force at 0.5 MPa to handle moderate assembly loads.
Is the Airtac SAIJ63 Adjustable Stroke Air Cylinder SAIJ63AX125-75 the Right Cylinder?
Choose this 63 mm bore if your application requires around 1559 N of push force at 0.5 MPa. If you need less force, the 50 mm bore offers 982 N; if you need more, the 80 mm bore provides 2513 N. The 75 mm adjustment range is particularly useful for product changeovers, allowing you to shorten the stroke by up to 75 mm without swapping the cylinder or adding external stops. Because the nominal stroke is 125 mm, an external guide is not strictly required for side loads, but the 20 mm rod diameter should still be factored into your mounting plan.
When replacing an ISO 15552 cylinder, match the 63 mm bore, 125 mm stroke, 75 mm adjustment, PT G3/8 ports, and your required mounting style. SAIJ supports a reduced mounting set including Basic, FA, LB, TC, FTC, TCM1, and TCM2, but omits FB, CA, CB, and CR. If your process requires true load-holding without live air, this adjuster will not suffice; consider the SAIL or BSAI series 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 SAIJ63 Adjustable Stroke Air Cylinder SAIJ63AX125-75 FAQ
At 0.5 MPa operating pressure, this 63 mm bore cylinder provides 1559 N of push force and 1402 N of pull force. At the maximum 1.0 MPa pressure, it delivers up to 318 kgf.
The rear adjuster screw acts as a mechanical stop that lets you shorten the 125 mm nominal stroke by up to 75 mm, creating a 50-125 mm usable travel window. It only sets the end position and does not lock or hold the load without continuous air pressure.
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