Airtac SAIJ125 Adjustable Cylinder SAIJ125AX20-10
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125AX20-10 is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø125mm bore and 20mm 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
- Stroke20 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2
- CushionAdjustable, 40 mm
About the Airtac SAIJ125 Adjustable Cylinder SAIJ125AX20-10
The AirTAC SAIJ125X20-10 is a double-acting, single-rod ISO 15552 profile cylinder featuring a rear mechanical adjuster. It provides a nominal 20 mm stroke that can be dialed back by up to 10 mm, yielding a highly precise 10-20 mm usable travel window. This allows you to fine-tune the retract end position at commissioning without swapping out the physical cylinder or adding external stops.
Belonging to the 125 mm bore class, it generates 6136 N of push force and 5734 N of pull force at 0.5 MPa. It features a SUS420J2 stainless steel rod (material code A) for enhanced corrosion resistance and uses PT tapered port threads. The extruded aluminum barrel includes sensor grooves on both sides, though a magnet is not specified for this configuration, meaning electronic DMSE or reed CMSE sensors cannot be used without adding the -S option.
Airtac SAIJ125 Adjustable Cylinder SAIJ125AX20-10 Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125AX20-10 |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø125 mm |
| Stroke | 20 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 SAIJ125AX20-10
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 125 | Bore size in mm. |
| ×20 | 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 SAIJ125AX20-10 Is Used
Short-Stroke Pressing
Ideal for high-force pressing or clamping operations where the final 10-20 mm of travel must be precisely dialed in to avoid over-travel and damage to delicate workpieces.
Product Changeover
Enables rapid line changeovers by allowing operators to adjust the retract end position by up to 10 mm to accommodate slight variations in incoming product sizes without changing tooling.
End-Stop Tuning
Perfect for assembly stations needing exact bottoming-out positions, where the rear screw adjusts the final resting point dynamically during machine commissioning.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125AX20-10 the Right Cylinder?
Choose this 125 mm bore when substantial thrust is required in a compact footprint; stepping down to a 100 mm bore drops the 0.5 MPa push force to 3927 N. Selecting an adjustable-stroke SAIJ over a fixed SAI is ideal for machine setups requiring variable end stops or product-size changeovers. Because the stroke is very short (20 mm) and the 125 mm bore produces high forces, ensure your mounting setup—using the available Basic, FA, LB, TC, FTC, TCM1, or TCM2 interfaces—can withstand the impact loads. For any application requiring the load to be held without continuous live air pressure, note that the rear adjuster acts only as a travel stop and deceleration buffer, not a lock; you would need an external pilot-operated check valve or a SAIL/BSAI locking cylinder 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 SAIJ125 Adjustable Cylinder SAIJ125AX20-10 FAQ
At 0.5 MPa operating pressure, this 125 mm bore cylinder provides 6136 N of push force and 5734 N of pull force. At the maximum operating pressure of 1.0 MPa, it delivers up to 1251 kgf.
The SAIJ125X20-10 has a nominal 20 mm stroke with a rear adjuster that allows you to shorten the travel by up to 10 mm, creating a 10-20 mm usable travel window. The adjuster acts as a mechanical stop to fine-tune the end position; it does not lock the load when air is removed.
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