Airtac SAIJ125 Adjustable Cylinder SAIJ125AX65-20
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125AX65-20 is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø125mm bore and 65mm 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
- Stroke65 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2
- CushionAdjustable, 40 mm
About the Airtac SAIJ125 Adjustable Cylinder SAIJ125AX65-20
The AirTAC SAIJ125X65-20 is a double-acting ISO 15552 profile cylinder featuring a rear stroke adjuster, engineered to provide a usable travel window of 45 to 65 mm. By turning the external rear screw, you can fine-tune the retract end-position during commissioning without adding external stops or swapping the cylinder. It delivers a robust 6136 N push force at 0.5 MPa, making it well-suited for heavy-duty positioning tasks.
This unit is built with a SUS420J2 stainless steel rod (material code A) for enhanced corrosion resistance and utilizes PT tapered port threads. The extruded aluminum barrel includes sensor grooves on both sides, and the cylinder operates at speeds of 30-500 mm/s with variable air cushions at both ends to decelerate the load smoothly.
Airtac SAIJ125 Adjustable Cylinder SAIJ125AX65-20 Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125AX65-20 |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø125 mm |
| Stroke | 65 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 SAIJ125AX65-20
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 125 | Bore size in mm. |
| ×65 | 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 SAIJ125AX65-20 Is Used
Machine Setup Changeover
Dial in the exact retract position within the 45-65 mm window during product size transitions without physically replacing the actuator or adding external shims.
Heavy-Duty End Stops
Leverage the 6136 N push force to securely move heavy pallets or fixtures, using the rear adjuster to precisely set the final resting position.
Variable Positioning Jigs
Fine-tune clamping or pressing distances on automated jigs where the exact end-of-stroke point must be adjusted per workpiece batch.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125AX65-20 the Right Cylinder?
Choose this 125 mm bore when an application requires substantial thrust, such as 6136 N push at 0.5 MPa, combined with precise end-stop tuning. If your force requirements are lower, stepping down to a 100 mm bore yields 3927 N push force, whereas moving up to a 160 mm bore provides 10053 N. The adjustable stroke is ideal for product changeovers on a line, allowing you to dial in the exact position without replacing the actuator.
Because the stroke is 65 mm, side-load risks are minimal, but always ensure the M27x2 rod thread is properly aligned with your load coupling. Remember that the rear adjuster acts only as a travel stop, not a lock; the SAIJ125X65-20 will not hold its position without live air. For load-holding requirements without continuous pressure, consider an AirTAC SAIL or BSAI cylinder. This model is dimensionally interchangeable per ISO 15552 and supports Basic, FA, LB, TC, FTC, TCM1, and TCM2 mounts.
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 SAIJ125AX65-20 FAQ
At an operating pressure of 0.5 MPa, this 125 mm bore cylinder generates a push force of 6136 N and a pull force of 5734 N. It can achieve a maximum push force of 11045 N at 0.9 MPa.
The rear external screw acts as a mechanical stop that allows you to shorten the effective travel from the nominal 65 mm down to a minimum of 45 mm. It sets the end position but does not lock the load without continuous air pressure.
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