Airtac SAIJ125 Adjustable Cylinder SAIJ125X300-50
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125X300-50 is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø125mm bore and 300mm 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
- Stroke300 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2
- CushionAdjustable, 40 mm
About the Airtac SAIJ125 Adjustable Cylinder SAIJ125X300-50
The AirTAC SAIJ125X300-50 is a double-acting ISO 15552 profile cylinder featuring a rear stroke adjuster that creates a 250-300mm usable travel window from its 300mm nominal stroke. Delivering 6136N of push force at 0.5 MPa, it handles heavy positioning tasks. The extruded aluminum barrel includes sensor grooves on both sides for flexible mounting of CMSE or DMSE switches.
This model uses a carbon steel piston rod with an M27x2 thread and a G1/2 port. The rear adjuster acts as a mechanical stop for fine-tuning end positions during commissioning or product changeovers, but it does not hold the load without live air pressure. Adjustable air cushions at both ends manage deceleration for this 125mm bore unit.
Airtac SAIJ125 Adjustable Cylinder SAIJ125X300-50 Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125X300-50 |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø125 mm |
| Stroke | 300 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 SAIJ125X300-50
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 125 | Bore size in mm. |
| ×300 | 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 SAIJ125X300-50 Is Used
Variable Product Changeover
Dial in the 250-300mm travel window during line format changes to accommodate different package sizes without swapping cylinders.
Heavy Press Positioning
Leverage the 6136N push force at 0.5 MPa to seat heavy components, using the rear stopper to fine-tune the final contact position.
Machine Setup Tuning
Eliminate external stop blocks during initial commissioning by trimming up to 50mm of stroke directly at the rear of the cylinder.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125X300-50 the Right Cylinder?
Choose this 125mm bore cylinder when your application requires 6136N of thrust at 0.5 MPa and on-the-fly end-position tuning. If your force requirements are lower, stepping down to a 100mm bore provides 3927N, while moving up to a 160mm bore yields 10053N. The adjustable stroke is ideal for variable product sizes, whereas a fixed SAI cylinder suits dedicated single-purpose stations.
For an exact ISO 15552 replacement match, verify the 125mm bore, 300mm stroke, 50mm adjustment range, PT tapered port threads, and your required mounting accessories (Basic, FA, LB, TC, FTC, TCM1, or TCM2). Because the stroke is 300mm, the M27x2 rod and thread should carry the load with an external guide to prevent side-load damage. For position holding without live air, select a SAIL or BSAI series cylinder instead of relying on the adjuster.
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 SAIJ125X300-50 FAQ
The rear adjuster screw lets you shorten the effective stroke by up to 50mm, providing a 250-300mm usable travel window. It acts as a mechanical stop for end-position tuning and does not lock the load without continuous air pressure.
At 0.5 MPa, the SAIJ125X300-50 provides 6136N of push force and 5734N of pull force. It operates at speeds of 30-500 mm/s and uses adjustable air cushions at both ends to decelerate the load.
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