Airtac SAIJ125 Adjustable Cylinder SAIJ125AX240-100S
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125AX240-100S is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø125mm bore and 240mm 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
- Stroke240 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2
- CushionAdjustable, 40 mm
About the Airtac SAIJ125 Adjustable Cylinder SAIJ125AX240-100S
The AirTAC SAIJ125X240-100-S is a double-acting ISO 15552 profile cylinder featuring a rear stroke adjuster. It provides a 140 to 240 mm usable travel window, allowing you to dial back the nominal stroke by up to 100 mm during commissioning. This 125 mm bore generates 8590 N of push force at 0.7 MPa, making it well suited for heavy machinery. The extruded aluminum barrel includes sensor grooves on both sides for flexible mounting.
This unit is built with a SUS420J2 stainless steel rod (code A) for enhanced corrosion resistance and includes a magnet (-S) for position feedback. It uses PT tapered ports and operates at speeds of 30 to 500 mm/s. The rear adjuster acts purely as a travel stop to fine-tune the end position without swapping cylinders. For load-holding without live air pressure, consider a SAIL or BSAI series cylinder instead.
Airtac SAIJ125 Adjustable Cylinder SAIJ125AX240-100S Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125AX240-100S |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø125 mm |
| Stroke | 240 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 SAIJ125AX240-100S
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 125 | Bore size in mm. |
| ×240 | 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 SAIJ125AX240-100S Is Used
Heavy Product Changeover
Dial in the 140 to 240 mm travel window during line changeovers to accommodate different large product sizes without physically swapping the actuator.
Precision End-Stop Tuning
Use the rear adjuster to fine-tune the retraction end position during machine setup, ensuring perfect alignment for high-force pressing or holding tasks.
Variable Length Indexing
Adjust the stroke on the fly for conveyor sorting mechanisms that handle varying package lengths, relying on the 6136 N pull force at 0.5 MPa to move loads reliably.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125AX240-100S the Right Cylinder?
Choose this 125 mm bore model when your application requires substantial thrust, such as 8590 N at 0.7 MPa. If you need less force, stepping down to an 80 mm bore yields 3518 N at 0.7 MPa, while a 160 mm bore offers 14074 N for heavier loads. The 100 mm adjustment range is ideal for product changeovers where end-position tuning is frequent, eliminating the need to bolt on external stops compared to a fixed SAI cylinder.
When replacing an ISO 15552 cylinder, match the 125 mm bore, 240 mm nominal stroke, PT port, and -S magnet. The SAIJ mounting set includes Basic, FA, LB, TC, FTC, TCM1, and TCM2 options, omitting FB, CA, CB, and CR. Because the total travel can reach 240 mm, ensure you provide an external guide to handle side loads and protect the 32 mm rod thread from bending stress.
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 SAIJ125AX240-100S FAQ
This 125 mm bore cylinder delivers 6136 N of push force and 5734 N of pull force at 0.5 MPa. At 0.7 MPa, the push force increases to 8590 N, and at 0.9 MPa it reaches 11045 N.
The rear adjuster acts as a mechanical stop that lets you trim the effective travel back from the 240 mm nominal stroke down to 140 mm. This creates a 100 mm usable window for fine-tuning end positions at commissioning without adding external stops.
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