Airtac SAIJ125 Adjustable Cylinder SAIJ125AX210-75
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125AX210-75 is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø125mm bore and 210mm 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
- Stroke210 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2
- CushionAdjustable, 40 mm
About the Airtac SAIJ125 Adjustable Cylinder SAIJ125AX210-75
The AirTAC SAIJ125X210-75 is a double-acting, single-rod ISO 15552 profile cylinder featuring a rear-mounted stroke adjuster. It delivers 6136N of push force at 0.5MPa and provides a usable travel window of 135-210mm, letting you trim up to 75mm off the nominal 210mm stroke during commissioning. This specific configuration features a SUS420J2 stainless steel rod (material code A) and PT tapered port threads.
Because the adjuster acts purely as a mechanical stop, it decelerates the travel end but does not hold the load without live air pressure. For load-holding without continuous air, consider the SAIL or BSAI series. This model operates at 30-500mm/s and includes variable air cushions at both ends (40mm cushion length) to manage kinetic energy.
Airtac SAIJ125 Adjustable Cylinder SAIJ125AX210-75 Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125AX210-75 |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø125 mm |
| Stroke | 210 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 SAIJ125AX210-75
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 125 | Bore size in mm. |
| ×210 | 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 SAIJ125AX210-75 Is Used
Product Changeover Adjustment
Quickly adapt machinery for different carton lengths by dialing the rear stopper back up to 75mm, avoiding physical cylinder swaps during production runs.
End-Position Tuning
Fine-tune the final retract position during machine commissioning to achieve exact mechanical alignment without machining custom external spacers.
Variable Diverter Stroke
Set precise deflection distances on sorting conveyors where the required actuation travel varies based on package dimensions.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125AX210-75 the Right Cylinder?
Choose this 125mm bore when an 80mm bore (2513N at 0.5MPa) is insufficient, but a 160mm bore (10053N) would be excessive overkill. The 75mm adjustment range is particularly valuable on packaging lines or equipment requiring frequent product-size changeovers, allowing you to dial in the exact end position without swapping cylinders or adding external stops. The 32mm rod thread and substantial piston rod handle high side loads well, though any stroke over 300mm would require an external guide.
To match this exact unit for an ISO 15552 replacement, specify: 125mm bore, 210mm stroke, 75mm adjustment, PT G1/2 port, and the SUS420J2 rod material (code A). Note that SAIJ uses a specific mounting subset: Basic, FA, LB, TC, FTC, TCM1, and TCM2. It omits FB, CA, CB, and CR mounts. As no magnet is specified, position sensing requires adding an external switch track or upgrading to an -S variant for CMSE reed or DMSE electronic sensors.
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 SAIJ125AX210-75 FAQ
At 0.5MPa operating pressure, this 125mm bore cylinder provides 6136N of push force and 5734N of pull force. At the maximum 1.0MPa pressure, it can deliver up to 1251kgf.
The rear adjuster acts as a mechanical stop that shortens the effective travel. For this 210mm nominal stroke model, you can trim the stroke by up to 75mm, creating a usable travel window of 135-210mm. It only sets the end position; it does not lock the load without continuous air pressure.
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