Airtac SAIJ125 Adjustable Cylinder SAIJ125AX650-40
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125AX650-40 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 SAIJ125AX650-40
The AirTAC SAIJ125X650-40 is a double-acting ISO 15552 profile cylinder featuring a rear-mounted stroke adjuster. It provides a 610 to 650 mm usable travel window, allowing you to dial back the nominal 650 mm stroke by up to 40 mm during commissioning. With a 125 mm bore, it generates 6136 N of push force and 5734 N of pull force at 0.5 MPa. The rod is constructed from SUS420J2 stainless steel (code A) for enhanced corrosion resistance, and the body uses an extruded aluminum barrel with sensor grooves on both sides.
This model features PT tapered port threads (G1/2) and operates at speeds of 30 to 500 mm/s. The rear adjuster acts purely as a mechanical stop to fine-tune the retract end position without adding external stops. It supports a reduced mounting set including Basic, FA, LB, TC, FTC, TCM1, and TCM2, omitting FB, CA, CB, and CR brackets.
Airtac SAIJ125 Adjustable Cylinder SAIJ125AX650-40 Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125AX650-40 |
|---|---|
| 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 SAIJ125AX650-40
| 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 SAIJ125AX650-40 Is Used
Variable End-Stop Machining
Dial in the exact 610 to 650 mm retract position on the fly for machining fixtures without swapping out the entire cylinder or adding external stopper blocks.
Product Changeover Lines
Quickly adjust the end-of-stroke position up to 40 mm during packaging line format changes to accommodate different product lengths efficiently.
Long-Stroke Press Setup
Fine-tune the bottoming position of a 125 mm bore press operation during commissioning, utilizing the 6136 N thrust at 0.5 MPa for precise forming.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125AX650-40 the Right Cylinder?
Choose this 125 mm bore adjustable-stroke cylinder when your machine setup requires variable end-stops or product changeovers without replacing the cylinder. If you need less force, stepping down to a 100 mm bore yields 3927 N of push at 0.5 MPa. If your application requires load-holding without live air pressure, note that the SAIJ rear adjuster is a travel stop, not a lock; you should instead select an AirTAC SAIL (air-released lock) or BSAI (clamp-lock) cylinder. To replace this with a fixed-stroke ISO 15552 cylinder, match the 125 mm bore, 650 mm stroke, PT port thread, and the required mounting bracket.
Because the 650 mm stroke is relatively long, the 32 mm rod diameter and M27x2 rod thread will carry significant side loads, but an external guide is still recommended to prevent rod bending under heavy offset loads.
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 SAIJ125AX650-40 FAQ
At 0.5 MPa operating pressure, this 125 mm bore cylinder generates 6136 N of push force and 5734 N of pull force. At the maximum 1.0 MPa pressure, it can deliver up to 1251 kgf.
The rear adjusting screw acts as a mechanical stop that lets you shorten the effective travel from the 650 mm nominal stroke down to 610 mm. It fine-tunes the end position but does not hold the load without live air pressure.
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