Airtac SAIJ125 Adjustable Cylinder SAIJ125AX500-50S
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125AX500-50S 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 SAIJ125AX500-50S
The AirTAC SAIJ125X500-50-S is a double-acting ISO 15552 profile cylinder featuring a rear stroke adjuster. It provides a 450 to 500 mm usable travel window by allowing you to trim the nominal 500 mm stroke back by up to 50 mm. Built with a 125 mm bore, it delivers 8590 N of push force at 0.7 MPa, making it well-suited for heavy-duty positioning tasks.
This variant includes an -S magnet for CMSE and DMSE sensors, using electronic solid-state or reed switches that mount directly into the extruded aluminum barrel's dual sensor grooves. The piston rod is constructed from SUS420J2 stainless steel (code A) for enhanced durability against moisture, and it uses PT tapered port threads. The rear adjuster acts strictly as a travel stop to fine-tune end positions at commissioning, meaning it will not hold a load without continuous live air pressure.
Airtac SAIJ125 Adjustable Cylinder SAIJ125AX500-50S Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125AX500-50S |
|---|---|
| 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 SAIJ125AX500-50S
| 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 SAIJ125AX500-50S Is Used
Product Changeover
Quickly dial in the 450-500mm travel window during format changes on packaging lines without mechanical teardown.
Heavy Pressing
Leverage 8590N of force at 0.7MPa for heavy assembly presses while fine-tuning the exact retraction point.
Conveyor Diverter
Adjust the stopper position on the fly to handle varying pallet sizes on automated material handling conveyors.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125AX500-50S the Right Cylinder?
Choose this 125 mm bore cylinder when an application demands high force combined with variable end-stops. If your process requires less thrust, stepping down to an 80 mm bore yields 3518 N at 0.7 MPa. The 50 mm adjustment range is ideal for product changeovers, letting you dial in the exact end position without swapping the cylinder or adding external stopper blocks. Because the nominal 500 mm stroke is relatively long, an external guide is recommended to prevent excessive side-loading on the 32 mm rod and M27x2 rod thread.
For an exact ISO 15552 replacement match, verify a 125 mm bore, 500 mm stroke, 50 mm adjustment, PT tapered ports, and the -S magnet option. Remember that the rear adjuster is a stop, not a lock. If you need true fail-safe load holding without live air, consider the AirTAC SAIL or BSAI series instead. The SAIJ mounting set includes Basic, FA, LB, TC, FTC, TCM1, and TCM2, omitting the FB, CA, CB, and CR styles.
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 SAIJ125AX500-50S FAQ
At 0.7 MPa operating pressure, this 125 mm bore cylinder provides 8590 N of push force and 5734 N of pull force. The maximum thrust is 11045 N at 0.9 MPa.
The rear adjusting screw acts as an external stopper, allowing you to shorten the effective travel from 500 mm down to 450 mm. This is used for fine-tuning end positions at commissioning without swapping cylinders.
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