Airtac SAIJ125 Adjustable Cylinder SAIJ125X180-75
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125X180-75 is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø125mm bore and 180mm 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
- Stroke180 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2
- CushionAdjustable, 40 mm
About the Airtac SAIJ125 Adjustable Cylinder SAIJ125X180-75
The AirTAC SAIJ125X180-75 is a double-acting ISO 15552 profile cylinder featuring a rear stroke adjuster that allows you to trim the effective travel by up to 75 mm. This creates a highly versatile usable stroke window of 105 to 180 mm, letting you dial in the exact end position during commissioning without swapping out the barrel or adding external stops. It delivers robust thrust, pushing with 6136 N and pulling with 5734 N at 0.5 MPa, making it well-suited for heavy-duty positioning tasks.
This bore features a 32 mm carbon steel piston rod with an M27x2 thread, designed to handle significant side loads, though long or heavy assemblies still require an external guide. The extruded aluminum barrel includes sensor grooves on both sides for flexible mounting of CMSE reed or DMSE electronic sensors if a magnet is added later. The SAIJ mounting set includes Basic, FA, LB, TC, FTC, TCM1, and TCM2 options, specifically omitting FB, CA, CB, and CR configurations. Standard NBR seals support operating speeds of 30-500 mm/s.
Airtac SAIJ125 Adjustable Cylinder SAIJ125X180-75 Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125X180-75 |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø125 mm |
| Stroke | 180 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 SAIJ125X180-75
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 125 | Bore size in mm. |
| ×180 | 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 SAIJ125X180-75 Is Used
Product Changeover Adjustment
Rapidly reconfigure the 105-180 mm stroke window on packaging lines when switching between different carton sizes, eliminating the need for manual spacer adjustments.
Heavy Press End-Tuning
Fine-tune the final 75 mm of travel during machine commissioning to perfectly set the pressing force on heavy assemblies without replacing the cylinder.
Variable Position Ejection
Adjust the retract distance on an ejection station to accommodate varying part widths, ensuring parts are pushed precisely onto the downstream conveyor.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125X180-75 the Right Cylinder?
Choose this 125 mm bore when a 100 mm bore (offering 3927 N push force at 0.5 MPa) is insufficient for your load, but a larger 160 mm bore (10053 N push force) would be excessive overkill. The 75 mm adjustment range is particularly valuable for machinery that processes varying product sizes, allowing operators to change the end-stop position rapidly during product changeovers without machining new hard stops. The PT tapered port threads ensure a robust, leak-free pneumatic connection.
Because this is a standard double-acting cylinder, the rear adjuster functions strictly as a mechanical travel stop and deceleration point, not a lock. It will not hold a load in place without continuous live air pressure. If your application requires true fail-safe load holding, you must integrate an external pilot-operated check valve or select a related AirTAC series like the SAIL (pneumatic lock) or BSAI (clamp-lock). When replacing an ISO 15552 cylinder, match the 125 mm bore, 180 mm stroke, 75 mm adjustment, G1/2 port, and appropriate mounting hardware.
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 SAIJ125X180-75 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 supports a standard operating speed range of 30-500 mm/s.
The rear adjuster screw allows you to shorten the 180 mm nominal stroke by up to 75 mm, providing an effective usable travel window of 105 to 180 mm. This allows precise end-position tuning during setup without changing the cylinder.
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