Airtac SAIJ125 Adjustable Cylinder SAIJ125AX120-75
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125AX120-75 is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø125mm bore and 120mm 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
- Stroke120 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2
- CushionAdjustable, 40 mm
About the Airtac SAIJ125 Adjustable Cylinder SAIJ125AX120-75
The AirTAC SAIJ125X120-75 is a double-acting ISO 15552 profile cylinder featuring a rear stroke adjuster that allows you to fine-tune the effective travel down to a 45-120 mm window. It delivers 6136 N of push force at 0.5 MPa, making it suited for heavy-duty positioning tasks. The extruded aluminum barrel includes sensor grooves on both sides for flexible mounting of CMSE reed or DMSE electronic switches.
This variant uses an SUS420J2 stainless steel piston rod (material code A) for enhanced corrosion resistance and features a PT tapered port thread. The rear adjuster acts purely as a mechanical stop to trim the stroke during commissioning or product changeovers. It does not lock the load; for position holding without live air pressure, consider an AirTAC SAIL or BSAI series cylinder.
Airtac SAIJ125 Adjustable Cylinder SAIJ125AX120-75 Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125AX120-75 |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø125 mm |
| Stroke | 120 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 SAIJ125AX120-75
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 125 | Bore size in mm. |
| ×120 | 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 SAIJ125AX120-75 Is Used
Product Changeovers
Dial in the 45-120 mm travel window on the fly to accommodate different package sizes on a packaging line without swapping out the cylinder.
End-Stop Calibration
Use the rear mechanical stopper to precisely set the retracted end position during machine commissioning, avoiding the need for external stop blocks.
Heavy-Duty Positioning
Leverage the 6136 N push force at 0.5 MPa to move heavy pallets or industrial fixtures, relying on the adjuster to fine-tune the final resting position.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125AX120-75 the Right Cylinder?
Select this 125 mm bore cylinder when an application requires substantial thrust—6136 N at 0.5 MPa or 8590 N at 0.7 MPa. If your process needs less force, stepping down to the 100 mm bore yields 3927 N at 0.5 MPa, whereas moving up to the 160 mm bore provides 10053 N. The integrated rear adjuster is chosen over a fixed-stroke SAI cylinder when machinery requires variable end-stops or precise end-position tuning without adding external physical stops.
When replacing an ISO 15552 cylinder, match the 125 mm bore, 120 mm stroke, 75 mm adjustment range, PT port thread, and required mounting style. SAIJ supports Basic, FA, LB, TC, FTC, TCM1, and TCM2 mounts. Note that the rear adjuster only sets the travel end and works alongside the variable air cushions; it does not function as a brake. Operating speed is rated for 30-500 mm/s.
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 SAIJ125AX120-75 FAQ
At an operating pressure of 0.5 MPa, this 125 mm bore cylinder provides 6136 N of push force and 5734 N of pull force. At 0.7 MPa, the push force increases to 8590 N.
The rear adjusting screw acts as a mechanical stopper, allowing you to shorten the 120 mm nominal stroke by up to 75 mm. This creates a usable travel window of 45 to 120 mm, enabling fine-tuning of the end position without changing the cylinder.
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