Airtac SAIJ125 Adjustable Cylinder SAIJ125X650-100
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125X650-100 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 SAIJ125X650-100
The AirTAC SAIJ125X650-100 is a double-acting, single-rod ISO 15552 profile cylinder equipped with a rear stroke adjuster. It provides a nominal 650 mm stroke that can be fine-tuned down by up to 100 mm, yielding a usable travel window of 550-650 mm. This built-in adjustability allows operators to dial in exact retract end positions during commissioning or product changeovers without swapping out the entire actuator. Delivering 8590 N of push force at 0.7 MPa, it is built for heavy-duty positioning.
This model features a robust 32 mm carbon steel rod with an M27x2 thread, paired with 40 mm adjustable air cushions at both ends to manage kinetic energy. The extruded aluminum barrel includes sensor grooves on both sides for direct mounting of switches. If position feedback is required later, adding a magnet for CMSE reed or DMSE electronic sensors can be specified, though this standard unit ships without one.
Airtac SAIJ125 Adjustable Cylinder SAIJ125X650-100 Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125X650-100 |
|---|---|
| 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 SAIJ125X650-100
| 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 SAIJ125X650-100 Is Used
Variable End-Stop Positioning
Ideal for diverter gates or heavy clamping fixtures where the exact retract distance needs to be dialed in precisely between 550 and 650 mm during initial setup.
Product Size Changeovers
Enables rapid line changeovers for different product dimensions by simply turning the rear adjuster screw rather than physically replacing long-stroke actuators.
Heavy-Duty Machine Setup
Provides the high thrust needed to move substantial masses while allowing technicians to fine-tune the end-of-stroke deceleration point without adding external stops.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125X650-100 the Right Cylinder?
Selecting this 125 mm bore actuator makes sense when your application demands high thrust—such as 6136 N push at 0.5 MPa—combined with variable end-stop positioning. If you need less force, stepping down to a 100 mm bore yields 5497 N push at 0.7 MPa, while moving up to a 160 mm bore provides 14074 N. The rear adjusting screw on this SAIJ model acts purely as a mechanical stop to set the retract position; it does not lock the load. For holding a load securely without live air pressure, consider an AirTAC SAIL pneumatic lock or a BSAI clamp-lock cylinder instead.
Because the 650 mm stroke is relatively long, the 32 mm rod requires external guiding to prevent excessive side-loading and premature seal wear. This cylinder is dimensionally interchangeable per ISO 15552 mounting interfaces. It uses a PT tapered G1/2 port and supports a reduced mounting set of Basic, FA, LB, TC, FTC, TCM1, and TCM2 (omitting FB, CA, CB, and CR). The operating speed range is 30-500 mm/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 SAIJ125X650-100 FAQ
At a 0.7 MPa operating pressure, this 125 mm bore cylinder generates 8590 N of push force and 7988 N of pull force. At the maximum 1.0 MPa pressure, it can deliver up to 1251 kgf.
The rear adjuster acts as a mechanical stop that shortens the effective retract stroke. For this 650 mm nominal stroke cylinder, you can trim the travel back by up to 100 mm, creating a usable positioning window of 550 to 650 mm without changing the physical cylinder.
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