Airtac SAIJ125 Adjustable Cylinder SAIJ125AX65-50
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125AX65-50 is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø125mm bore and 65mm 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
- Stroke65 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2
- CushionAdjustable, 40 mm
About the Airtac SAIJ125 Adjustable Cylinder SAIJ125AX65-50
The AirTAC SAIJ125X65-50 is a double-acting ISO 15552 profile cylinder featuring a rear-mounted stroke adjuster. It delivers 6136N of push force at 0.5 MPa and provides a usable travel window of 15 to 65 mm, allowing you to dial back the nominal 65 mm stroke by up to 50 mm during commissioning. The extruded aluminum barrel includes sensor grooves on both sides for flexible mounting of CMSE or DMSE switches.
This unit is configured with a SUS420J2 stainless steel rod (option A) for improved corrosion resistance and features PT tapered port threads. The rear adjuster acts purely as a mechanical stop to set the end position; it does not lock or hold the load without live air pressure. For load-holding requirements without continuous air, consider the SAIL or BSAI series instead.
Airtac SAIJ125 Adjustable Cylinder SAIJ125AX65-50 Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125AX65-50 |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø125 mm |
| Stroke | 65 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 SAIJ125AX65-50
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 125 | Bore size in mm. |
| ×65 | 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 SAIJ125AX65-50 Is Used
Product Changeover Tuning
Dial in the exact retract distance from 15 to 65 mm when switching a packaging line to a different carton size without swapping out the cylinder.
End-Position Calibration
Fine-tune the final end-stop during machine commissioning to achieve precise pressing or clamping force without adding external hard stops.
Variable Forming Stops
Adjust the travel window on the fly for heavy-duty forming or bending jigs that require different material engagement depths.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125AX65-50 the Right Cylinder?
Choose this 125 mm bore when an application requires substantial thrust—stepping down to an 80 mm bore drops the 0.5 MPa push force to 2513N. An adjustable stroke is preferred over a fixed SAI cylinder when you need variable end-stops to fine-tune positioning across different product sizes on the same line. To match this exact configuration, specify the 125 mm bore, 65 mm stroke, 50 mm adjustment, PT ports, SUS420J2 rod, and no magnet. The standard SAIJ mounting set includes Basic, FA, LB, TC, FTC, TCM1, and TCM2.
Because the 32 mm rod and M27x2 thread handle high side loads, ensure proper external guidance for your payload. The cylinder operates at speeds of 30-500 mm/s. Remember that the rear screw stopper only decelerates or sets the travel end; it cannot function as a brake.
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 SAIJ125AX65-50 FAQ
At an operating pressure of 0.5 MPa, this 125 mm bore cylinder provides a push force of 6136N and a pull force of 5734N. At 0.7 MPa, the push force increases to 8590N.
The rear adjuster screw allows you to shorten the effective stroke from the nominal 65 mm down to 15 mm. This creates a 15-65 mm usable travel window for fine-tuning the end position at commissioning. The adjuster acts only as a travel stop and does not lock the load.
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