Airtac SAIJ125 Adjustable Cylinder SAIJ125X500-40S
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125X500-40S 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 SAIJ125X500-40S
The AirTAC SAIJ125X500-40-S is a double-acting, single-rod ISO 15552 profile cylinder equipped with a rear stroke adjuster. It provides a 460-500 mm usable travel window, allowing you to dial back the 500 mm nominal stroke by up to 40 mm during commissioning. In the 125 mm bore class, it delivers 6136 N of pull force at 0.5 MPa and reaches a maximum of 1251 kgf at 1.0 MPa. The integrated -S magnet enables position sensing with AirTAC CMSE reed and DMSE electronic switches.
This pneumatic actuator uses a PT tapered port (G1/2) and a 32 mm carbon steel rod with an M27x2 thread. Because the adjuster acts purely as a mechanical stop on the retract end, it does not hold the load without live air pressure. For fail-safe load holding, consider the SAIL or BSAI series instead.
Airtac SAIJ125 Adjustable Cylinder SAIJ125X500-40S Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125X500-40S |
|---|---|
| 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 SAIJ125X500-40S
| 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 SAIJ125X500-40S Is Used
Variable End-Stop Tuning
Dial in the exact retract position within the 460-500 mm window during machine setup to accommodate different part lengths without changing hardware.
Product Changeover
Quickly adjust the stroke stop on packaging lines when switching between box sizes, ensuring precise positioning without mechanical rebuilds.
Heavy-Duty Forming
Leverage the 6136 N pull force at 0.5 MPa to press and form components while using the rear screw to fine-tune the final stroke depth.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125X500-40S the Right Cylinder?
Choose this 125 mm bore adjustable-stroke cylinder when you need to fine-tune end positions on product changeovers without swapping the actuator or adding external stops. If your application requires less force, stepping down to an 80 mm bore yields 2268 N of pull at 0.5 MPa. If you need more power, moving up to a 160 mm bore provides 9425 N of pull. To match this ISO 15552 interchangeable profile, specify the 125 mm bore, 500 mm stroke, 40 mm adjustment, PT port, and -S magnet.
Because the 500 mm stroke is relatively long, the 32 mm rod and M27x2 thread still require an external guide to prevent excessive side loading on the seals. The SAIJ mounting set includes Basic, FA, LB, TC, FTC, TCM1, and TCM2 options, omitting the FB, CA, CB, and CR variants.
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 SAIJ125X500-40S FAQ
At 0.5 MPa, this 125 mm bore cylinder provides 6136 N of pull force and 8590 N of push force. At the maximum operating pressure of 1.0 MPa, it delivers up to 1251 kgf.
A rear mechanical screw allows you to shorten the effective travel by up to 40 mm, creating a 460-500 mm usable window. It functions as a travel stop and does not lock the load without live air pressure.
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Standard models usually ship in 3-4 days.
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