Airtac SAIJ125 Adjustable Cylinder SAIJ125X650-20
The AirTAC 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 a drop-in replacement for other ISO 15552 cylinders in automation lines.
- BoreØ125 mm
- Stroke650 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2
- CushionAdjustable, 40 mm
About the Airtac SAIJ125 Adjustable Cylinder SAIJ125X650-20
The AirTAC SAIJ125X650-20 is a double-acting, single-rod ISO 15552 profile cylinder featuring a rear stroke adjuster. It delivers a robust 8590N push force at 0.7 MPa, utilizing a G1/2 port and a 32mm carbon steel rod. 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 | 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 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.
Heavy Assembly Lines
Leverage the 8590N push force at 0.7 MPa to move substantial pallets or fixtures while maintaining precise end-stop control.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125X650-20 the Right Cylinder?
Choose this 125mm bore when a 100mm cylinder (providing 5497N push at 0.7 MPa) lacks the necessary thrust, but a 160mm bore (14074N) would be excessive. 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
At 0.7 MPa operating pressure, this 125mm bore cylinder provides 8590N of push force and 7600N of pull force. It can achieve a maximum push force of 11045N at 0.9 MPa.
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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