Airtac SAIJ125 Adjustable Cylinder SAIJ125X650-20
The AirTAC SAIJ125 Adjustable Cylinder SAIJ125X650-20 is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø125mm bore and 650mm stroke, G1/2 air ports and adjustable end cushioning. Its standardized mounting interface makes it interchangeable with other ISO 15552 cylinders at the mounting interface.
- BoreØ125 mm
- Stroke650 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2
- CushionAdjustable, 40 mm
- No minimum order. A single piece can be ordered.
- Ready in 3–5 business days. That is the time we take to process the order and hand it to the carrier. Transit time after that depends on the destination.
About the Airtac SAIJ125 Adjustable Cylinder SAIJ125X650-20
The AirTAC SAIJ125X650-20 is a double-acting, double-rod ISO 15552 profile cylinder featuring a rear stroke adjuster. By integrating an external stopper screw, this model provides a usable travel window of 630 to 650mm, allowing you to dial in the exact retract position without swapping hardware.
The rear adjuster acts purely as a mechanical stop to set the end-of-travel position, not as a load-holding lock. For applications requiring position maintenance without live air pressure, an external pilot-operated check valve or a related SAIL pneumatic lock cylinder is necessary. This extruded aluminum barrel design includes dual sensor grooves for straightforward CMSE or DMSE switch mounting.
Airtac SAIJ125 Adjustable Cylinder SAIJ125X650-20 Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125X650-20 |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø125 mm |
| Stroke | 650 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 | 5734 N | 5734 N |
| 0.7 MPa | 8027 N | — |
| Max (@1.0 MPa) | 1169 kgf | |
Double-rod model: the rod passes through the rear cover, so both piston faces lose rod area and push is shown at the annular-area value. Actual usable force is lower than theoretical due to friction and back-pressure. Size with a safety margin.
Model Code: Airtac SAIJ125 Adjustable Cylinder SAIJ125X650-20
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 125 | Bore size in mm. |
| ×650 | 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 SAIJ125X650-20 Is Used
Product Changeovers
Quickly adapt retract distances by up to 20mm during packaging format changes without disassembling the machine or replacing the cylinder.
End-Position Tuning
Fine-tune the 630-650mm travel window during commissioning to perfectly align heavy mechanical stops under high thrust loads.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125X650-20 the Right Cylinder?
The 20mm adjustment window is ideal for fine-tuning machinery during product changeovers, eliminating the need to physically swap out a fixed-stroke SAI cylinder. Ensure your setup uses the correct PT tapered port threads and a compatible mounting accessory from the SAIJ subset: Basic, FA, LB, TC, FTC, TCM1, or TCM2.
Because this unit features a 650mm stroke, the extended length increases susceptibility to side-loading forces. Despite the sturdy 32mm rod and M27x2 thread, you must incorporate an external guide to prevent premature seal wear. Operating speed for this bore size ranges from 30-500mm/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 SAIJ125X650-20 FAQ
The rear adjuster screw allows you to mechanically shorten the effective stroke within a 630 to 650mm window. This stopper sets the retract end position but does not hold the load dynamically without continuous air pressure.
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Covers non-human-caused product damage.
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Standard models are processed and dispatched in 3-5 business days.
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Related AirTAC SAI Cylinders
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