Airtac SAIJ125 Adjustable Cylinder SAIJ125X100-20S
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125X100-20S is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø125mm bore and 100mm 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
- Stroke100 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2
- CushionAdjustable, 40 mm
About the Airtac SAIJ125 Adjustable Cylinder SAIJ125X100-20S
The AirTAC SAIJ125X100-20-S is a double-acting, single-rod ISO 15552 profile cylinder equipped with a rear mechanical stroke adjuster. It provides a usable travel window of 80 to 100 mm, allowing you to dial back the 100 mm nominal stroke by up to 20 mm during commissioning. Operating at 0.5 MPa, it generates 6136 N of push force and 5734 N of pull force, making it suitable for heavy-duty positioning tasks.
This variant features a carbon steel rod and includes a standard magnet (-S) for electronic position sensing. It is important to note that the rear adjuster acts strictly as an end-stop to fine-tune travel; it is not a locking mechanism and will not hold a load without sustained live air pressure. For load-holding requirements without air, consider the SAIL or BSAI series.
Airtac SAIJ125 Adjustable Cylinder SAIJ125X100-20S Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125X100-20S |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø125 mm |
| Stroke | 100 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 SAIJ125X100-20S
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 125 | Bore size in mm. |
| ×100 | 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 SAIJ125X100-20S Is Used
Variable End-Stop Positioning
Dial in the exact retract distance between 80 and 100 mm to accommodate varying material thicknesses without changing the cylinder setup.
Machine Changeover
Rapidly adjust the stroke end-position during product line changeovers to maintain precise timing and prevent overtravel damage.
Heavy-Duty Clamping
Utilize the 6136 N of push force at 0.5 MPa to secure heavy workpieces, tuning the final clamping position with the rear adjuster.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125X100-20S the Right Cylinder?
Choose this 125 mm bore cylinder when your application requires substantial thrust, such as 6136 N at 0.5 MPa, stepping up from a 100 mm bore that provides 3927 N. The adjustable 80 to 100 mm travel window is ideal for production lines running multiple product sizes, as it allows you to reposition the end-stop without physically swapping the cylinder or adding external stops. To replace an ISO 15552 cylinder, match the 125 mm bore, 100 mm stroke, PT tapered port threads, and the -S magnet option. Mounting options for this series include Basic, FA, LB, TC, FTC, TCM1, and TCM2. Because the stroke is 100 mm, no external guide is required for side-load support.
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 SAIJ125X100-20S FAQ
At 0.5 MPa operating pressure, this 125 mm bore cylinder provides 6136 N of push force and 5734 N of pull force. It can deliver up to 1251 kgf at its maximum 1.0 MPa pressure.
The rear adjuster screw allows you to shorten the effective stroke by up to 20 mm from the 100 mm nominal length, providing an adjustable travel window of 80 to 100 mm to fine-tune the end position without replacing the cylinder.
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