Airtac SAIJ125 Adjustable Cylinder SAIJ125AX50-20S
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125AX50-20S is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø125mm bore and 50mm 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
- Stroke50 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2
- CushionAdjustable, 40 mm
About the Airtac SAIJ125 Adjustable Cylinder SAIJ125AX50-20S
The AirTAC SAIJ125X50-20-S is a double-acting ISO 15552 profile cylinder equipped with a rear adjusting screw, allowing you to fine-tune the retract end position. With a 50 mm nominal stroke and a 20 mm adjustment range, it provides a usable travel window of 30-50 mm to perfectly dial in end-of-stroke positioning without adding external stops. It delivers a robust 6136 N pull force at 0.5 MPa, making it suitable for heavy-duty operations.
This specific configuration features a SUS420J2 stainless steel rod (material code A) for enhanced durability against moisture, and includes a magnet (-S) for use with AirTAC CMSE reed and DMSE electronic sensors. The extruded aluminum barrel includes sensor grooves on both sides, and the mounting set covers Basic, FA, LB, TC, FTC, TCM1, and TCM2.
Airtac SAIJ125 Adjustable Cylinder SAIJ125AX50-20S Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125AX50-20S |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø125 mm |
| Stroke | 50 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 SAIJ125AX50-20S
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 125 | Bore size in mm. |
| ×50 | 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 SAIJ125AX50-20S Is Used
Product Changeovers
Dial in the 30-50 mm travel window during format changes on a packaging line, ensuring the retraction point matches new container sizes perfectly.
Machine Setup Tuning
Fine-tune the end position at commissioning without swapping out the entire cylinder or fabricating external mechanical stops.
Heavy Clamping Stops
Leverage the 6136 N pull force to securely clamp heavy workpieces, using the adjuster to set the exact clamping depth.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125AX50-20S the Right Cylinder?
Choose this 125 mm bore when your application requires significant force, such as the 6136 N pull at 0.5 MPa provided here. If your load demands less push, stepping down to a 100 mm bore yields 3681 N pull, while moving up to a 160 mm bore offers 9425 N. The adjustable stroke is ideal for machine setups requiring variable end-stops during product changeovers rather than relying on a fixed-stroke SAI cylinder.
Because the stroke is 50 mm, side-load stress is minimal, though the 32 mm rod and M27x2 thread handle high axial loads well. Remember that the rear adjuster acts only as a travel stop, not a lock; the SAIJ does not hold loads without live air, so for position holding, consider the SAIL or BSAI series. This model uses PT tapered ports and is dimensionally interchangeable per ISO 15552.
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 SAIJ125AX50-20S FAQ
At 0.5 MPa operating pressure, this 125 mm bore cylinder provides 6136 N of pull force and 8590 N of push force. At the maximum 1.0 MPa pressure, it can deliver up to 1251 kgf.
The rear adjuster screw allows you to shorten the effective stroke from its 50 mm nominal length by up to 20 mm, creating a 30-50 mm usable travel window. This stopper sets the end position but does not lock the load without continuous air pressure.
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