Airtac SAIJ125 Adjustable Cylinder SAIJ125X650-30
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125X650-30 is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø125mm bore and 650mm 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
- Stroke650 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2
- CushionAdjustable, 40 mm
About the Airtac SAIJ125 Adjustable Cylinder SAIJ125X650-30
The AirTAC SAIJ125X650-30 is a double-acting ISO 15552 profile cylinder featuring a rear stroke adjuster that permits precise end-position tuning. With a 650 mm nominal stroke and a 30 mm adjustment range, you can dial back the effective travel to anywhere within a 620-650 mm window during commissioning. This bore class delivers 6136 N of pull force at 0.5 MPa and 8590 N at 0.7 MPa, making it suitable for heavy-duty positioning tasks.
The extruded aluminum barrel includes sensor grooves on both sides for CMSE reed or DMSE electronic switches. A carbon steel piston rod and M27x2 rod thread provide robust load transmission. The rear adjuster functions purely as a travel stop to set deceleration limits; it does not hold the load without live air pressure.
Airtac SAIJ125 Adjustable Cylinder SAIJ125X650-30 Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125X650-30 |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø125 mm |
| Stroke | 650 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 SAIJ125X650-30
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 125 | Bore size in mm. |
| ×650 | 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 SAIJ125X650-30 Is Used
Variable End Stops
Dial in the exact retraction point within the 620-650 mm window for machining operations that require strict positional control without mechanical hard stops.
Product Changeover
Adjust the rear stopper on the fly when switching between different package lengths on a packaging line, saving downtime on the production floor.
Heavy-Duty Positioning
Leverage the 8590 N pull force at 0.7 MPa to move heavy pallets or fixtures, using the rear screw to fine-tune the final resting position.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125X650-30 the Right Cylinder?
Choose this 125 mm bore when 80 mm falls short—its 2268 N pull at 0.5 MPa is less than half the force of this 125 mm unit. An adjustable stroke is selected over a fixed SAI cylinder when a machine handles varying product sizes, allowing operators to fine-tune the 620-650 mm travel window without adding external stops or swapping the cylinder. To replace this ISO 15552 cylinder, match the 125 mm bore, 650 mm stroke, 30 mm adjuster, PT tapered G1/2 port, and mounting from the SAIJ set (Basic, FA, LB, TC, FTC, TCM1, TCM2). Because the 650 mm stroke is long, an external guide is recommended to prevent excessive side loading on the rod.
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 SAIJ125X650-30 FAQ
At 0.5 MPa it provides 6136 N of pull force and 8590 N at 0.7 MPa. The maximum thrust is 11045 N at 0.9 MPa.
The rear adjuster acts as a stopper that lets you shorten the 650 mm nominal stroke by up to 30 mm, creating a 620-650 mm usable travel window. It only sets the end position and does not lock the load without continuous air pressure.
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Standard models usually ship in 3-4 days.
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