Airtac SAIJ125 Adjustable Cylinder SAIJ125AX55-40
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125AX55-40 is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø125mm bore and 55mm 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
- Stroke55 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2
- CushionAdjustable, 40 mm
About the Airtac SAIJ125 Adjustable Cylinder SAIJ125AX55-40
The AirTAC SAIJ125X55-40 is a double-acting ISO 15552 profile cylinder featuring a rear mechanical stroke adjuster. It delivers a robust 6136 N push force at 0.5 MPa, utilizing a 32 mm SUS420J2 stainless steel rod with an M27x2 thread. The integrated rear stopper screw allows you to fine-tune the travel end-point, providing a usable stroke window of 15 to 55 mm without requiring external stops.
This adjustable design is ideal for product changeovers, letting you dial in the exact end-position during commissioning rather than swapping out the entire actuator. It includes variable air cushions at both ends to manage deceleration, and the extruded aluminum barrel features sensor grooves on both sides. Note that the adjuster acts purely as a travel stop and does not lock the load without live air pressure.
Airtac SAIJ125 Adjustable Cylinder SAIJ125AX55-40 Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125AX55-40 |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø125 mm |
| Stroke | 55 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 SAIJ125AX55-40
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 125 | Bore size in mm. |
| ×55 | 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 SAIJ125AX55-40 Is Used
Product Changeovers
Dial in the 15-55 mm travel window during line changeovers to accommodate different product sizes without physically replacing the cylinder.
Machine Setup Tuning
Fine-tune the retract end-position at commissioning using the rear stopper, eliminating the need to bolt on external mechanical stops.
Heavy Clamping Fixtures
Leverage the 6136 N push force at 0.5 MPa for heavy-duty clamping, relying on the rear screw to set the exact clamping depth.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125AX55-40 the Right Cylinder?
Select this 125 mm bore actuator when an application requires heavy thrust combined with precise end-position tuning. If the 6136 N push force at 0.5 MPa is excessive for your fixture, stepping down to a 100 mm bore yields 3927 N. Conversely, if you need higher force, the 160 mm bore provides 10053 N. The SAIJ125X55-40 is chosen over a fixed-stroke SAI specifically when variable end-stops are needed for machine setup or product-size changes.
When matching this for an ISO 15552 replacement, verify the 125 mm bore, 55 mm nominal stroke, 40 mm adjustment range, PT tapered port thread, and your required mounting style (Basic, FA, LB, TC, FTC, TCM1, or TCM2). Because the 32 mm rod and M27x2 thread handle significant side loads, ensure your mounting configuration adequately supports the piston rod to prevent premature wear.
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 SAIJ125AX55-40 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 screw acts as a mechanical stop that lets you shorten the 55 mm nominal stroke by up to 40 mm. This creates a usable travel window of 15 to 55 mm, allowing precise end-position tuning. The adjuster is a stop only and does not hold the load without live air pressure.
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