Airtac SAIJ125 Adjustable Cylinder SAIJ125AX500-50
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125AX500-50 is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø125mm bore and 500mm 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
- Stroke500 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2
- CushionAdjustable, 40 mm
About the Airtac SAIJ125 Adjustable Cylinder SAIJ125AX500-50
The AirTAC SAIJ125X500-50 is a double-acting, single-rod ISO 15552 profile cylinder equipped with a rear stroke adjuster. It provides a nominal 500 mm stroke that can be fine-tuned down by up to 50 mm, yielding a usable travel window of 450-500 mm. Belonging to the 125 mm bore class, it delivers 6136 N of push force and 5734 N of pull force at 0.5 MPa, making it suitable for heavy-duty positioning tasks.
This variant features an SUS420J2 stainless steel rod (code A) for enhanced corrosion resistance and uses PT tapered port threads (G1/2). The extruded aluminum barrel includes sensor grooves on both sides. While the rear stopper screw allows precise end-position tuning during commissioning, it functions strictly as a travel stop and does not hold the load without live air pressure.
Airtac SAIJ125 Adjustable Cylinder SAIJ125AX500-50 Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125AX500-50 |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø125 mm |
| Stroke | 500 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 SAIJ125AX500-50
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 125 | Bore size in mm. |
| ×500 | 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 SAIJ125AX500-50 Is Used
Heavy-Duty Press Tuning
Dial in the exact 450-500 mm pressing depth during machine commissioning without machining new spacer blocks.
Product Size Changeover
Quickly adjust the rear stopper by up to 50 mm to accommodate different pallet lengths on an automated line.
Variable End-Stop Positioning
Set precise retraction limits for heavy 125 mm bore loads where a fixed standard SAI cylinder would require manual shimming.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125AX500-50 the Right Cylinder?
Selecting this 125 mm bore cylinder makes sense when your application requires substantial thrust—up to 6136 N at 0.5 MPa—combined with the flexibility to dial in the exact end-of-stroke position. If your setup needs less force, stepping down to a 100 mm bore provides 3927 N of push force. The adjustable -50 mm window is ideal for product changeovers, allowing you to shift the 500 mm travel limit without physically swapping the cylinder or adding external stopper blocks.
Because this is a 500 mm stroke, the 32 mm diameter rod and M27x2 rod thread must contend with potential side loads; an external guide is recommended to prevent rod bending over long unsupported travel. For drop-in compatibility, match the 125 mm bore, 500 mm stroke, PT port, and mounting style (Basic, FA, LB, TC, FTC, TCM1, or TCM2). If load-holding without live air is required, consider the SAIL or BSAI variants, as this adjuster is not a lock.
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 SAIJ125AX500-50 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 reach a maximum push force of 11045 N at 0.9 MPa.
The rear adjuster acts as a mechanical stop, allowing you to shorten the effective travel from the 500 mm nominal stroke down to 450 mm. This creates a 450-500 mm adjustable window for fine-tuning end positions without changing the cylinder.
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