Airtac SAIJ125 Adjustable Cylinder SAIJ125AX55-50S
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125AX55-50S 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 SAIJ125AX55-50S
The AirTAC SAIJ125X55-50-S is a double-acting ISO 15552 profile cylinder featuring a rear stroke adjuster that allows you to trim the effective travel. With a nominal 55 mm stroke and a 50 mm adjustment range, you get a usable travel window of 5 to 55 mm. This enables fine end-position tuning at commissioning without swapping the cylinder or bolting on external stops. The 125 mm bore delivers 6136 N of push force at 0.5 MPa, making it suited for heavy-duty positioning tasks.
This unit includes a SUS420J2 stainless steel rod (material code A) for enhanced corrosion resistance and carries the -S magnet option for use with AirTAC CMSE reed and DMSE electronic sensors. The rear adjuster acts purely as a mechanical stop to set the travel end, not as a lock, and does not hold the load without live air. It uses a PT tapered port and shares the standard SAI extruded aluminum barrel with sensor grooves on both sides.
Airtac SAIJ125 Adjustable Cylinder SAIJ125AX55-50S Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125AX55-50S |
|---|---|
| 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 SAIJ125AX55-50S
| 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 SAIJ125AX55-50S Is Used
Product Changeover
Dial in the exact end position for different product sizes on a packaging line by adjusting the rear stopper from 5 to 55 mm without changing hardware.
Machine Setup
Fine-tune the retract end-position during initial commissioning to achieve perfect alignment, eliminating the need for external mechanical stops.
Heavy Positioning
Leverage the 6136 N push force at 0.5 MPa to move heavy jigs into place, using the adjustable stroke to set the exact resting position.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125AX55-50S the Right Cylinder?
Choose this 125 mm bore adjustable cylinder when your application requires precise variable end stops and heavy force, as it provides 6136 N push at 0.5 MPa. If you need less force, stepping down to a 100 mm bore yields 3927 N, whereas moving up to a 160 mm bore provides 10053 N. The adjustable stroke is ideal for machine setup and product-size changeovers, giving you a 5 to 55 mm window to dial in the exact retract position. For holding a load without live air pressure, you would need to look at the SAIL or BSAI clamp-lock series, as the SAIJ rear adjuster is only a travel stop.
When replacing an ISO 15552 cylinder, match the 125 mm bore, 55 mm stroke, 50 mm adjustment, PT port, and the -S magnet. The SAIJ mounting set includes Basic, FA, LB, TC, FTC, TCM1, and TCM2, omitting FB, CA, CB, and CR. Because the 55 mm stroke is short, side-load stress is minimal, but the M27x2 rod thread still handles high mechanical loads effectively.
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 SAIJ125AX55-50S FAQ
It uses a rear adjusting screw that acts as a mechanical stopper. For this model, the 55 mm nominal stroke can be dialed back by up to 50 mm, giving an effective adjustable travel window of 5 to 55 mm to fine-tune the end position.
At 0.5 MPa operating pressure, it generates 6136 N of push force and 5734 N of pull force. At 0.7 MPa, the push force increases to 8590 N.
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