Airtac SAIJ125 Adjustable Cylinder SAIJ125AX240-50
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125AX240-50 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 SAIJ125AX240-50
The AirTAC SAIJ125X240-50 is a double-acting ISO 15552 profile cylinder featuring a rear stroke adjuster. It provides a 190-240 mm usable travel window, letting you dial back the nominal 240 mm stroke by up to 50 mm during commissioning. This bore size outputs 6136 N of push force at 0.5 MPa, making it suited for heavy material handling.
The cylinder uses a SUS420J2 stainless steel rod (code A) for corrosion resistance and carries PT tapered port threads. It includes variable air cushions at both ends to decelerate the load. The rear adjuster acts purely as a travel stop, so it will not hold a load without live air pressure.
Airtac SAIJ125 Adjustable Cylinder SAIJ125AX240-50 Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125AX240-50 |
|---|---|
| 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 SAIJ125AX240-50
| 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 SAIJ125AX240-50 Is Used
Product Changeover Tuning
Dial in the 190-240 mm travel window during production line size changeovers to set exact material push distances without external stops.
Heavy Fixture Positioning
Leverage the 6136 N push force at 0.5 MPa to move heavy machining fixtures into place, using the rear screw for final clamping alignment.
Assembly Line Setup
Fine-tune the end-of-stroke position during initial machine commissioning to accommodate mechanical tolerances across multiple assembly stations.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125AX240-50 the Right Cylinder?
Choose this 125 mm bore when a 100 mm bore (offering 3927 N at 0.5 MPa) lacks the thrust for your heavy fixtures, but a 160 mm bore is oversized. The 50 mm adjustment range is selected over a fixed SAI cylinder when you need precise end-position tuning for product-size changeovers without swapping hardware. Because the stroke is 240 mm, ensure your mounting configuration handles side loads; use an external guide rail for heavy masses to prevent rod wear.
For ISO 15552 replacement matching, verify the 125 mm bore, 240 mm stroke, 50 mm adjustment, PT G1/2 port, and your required mounting set (Basic, FA, LB, TC, FTC, TCM1, TCM2). This SKU lacks a magnet, so position sensing requires adding a separate external switch or choosing an -S variant. For load-holding without live pressure, select an SAIL or BSAI 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 SAIJ125AX240-50 FAQ
At a 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 rating.
The rear adjuster screw lets you shorten the effective travel from 240 mm down to as little as 190 mm. This creates a 50 mm tuning window for precise end-positioning without replacing the cylinder.
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