Airtac SAIJ125 Adjustable Cylinder SAIJ125BX650-75
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125BX650-75 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
- 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 SAIJ125BX650-75
The AirTAC SAIJ125X650-75 is a double-acting ISO 15552 profile cylinder equipped with a rear stroke adjuster, delivering 6136N of push force and 5734N of pull force at 0.5 MPa. It features a SUS304 stainless steel rod for superior corrosion resistance and utilizes PT tapered ports. With a nominal 650mm stroke, the external rear stopper allows you to trim the effective travel back by up to 75mm, creating a precise 575-650mm usable window for fine-tuning end positions.
This adjustable design eliminates the need to swap cylinders or bolt on external stops during product changeovers. The extruded aluminum barrel includes sensor grooves on both sides, and while this unit lacks a magnet, adding an -S option enables compatibility with AirTAC CMSE reed and DMSE electronic solid-state switches. The generous 32mm rod and M27x2 thread provide robust support, though the extended 650mm travel still necessitates an external guide to manage side loads.
Airtac SAIJ125 Adjustable Cylinder SAIJ125BX650-75 Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125BX650-75 |
|---|---|
| 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 SAIJ125BX650-75
| 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 SAIJ125BX650-75 Is Used
Product Size Changeovers
Quickly dial in the 575-650mm retract distance via the rear screw when switching a packaging line to accommodate different pallet or product heights without changing hardware.
Heavy Press Tuning
Leverage the 8590N push force at 0.7 MPa for heavy forming tasks, using the 75mm adjustment window to fine-tune the exact end-of-stroke contact position during machine commissioning.
Variable End-Stop Positioning
Achieve precise mechanical stops on large automated assembly equipment where the rear adjuster acts as a dedicated deceleration and positioning stop for varying workpiece lengths.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125BX650-75 the Right Cylinder?
Selecting this 125mm bore cylinder makes sense when your application requires heavy thrust—such as 6136N at 0.5 MPa or 8590N at 0.7 MPa—combined with variable end-stop positioning. If you need less force, stepping down to a 100mm bore yields 3927N at 0.5 MPa, while moving up to a 160mm bore provides 10053N. The SAIJ125X650-75 is chosen over a fixed-stroke SAI specifically when commissioning requires dialing in the exact retract distance within that 575-650mm range.
Because the stroke reaches 650mm, supporting the load with an external linear guide is critical to prevent excessive wear on the rod seals. Remember that the rear adjuster functions strictly as a travel stop, not a locking device; this plain SAIJ cannot hold a load without live air pressure. For dead-load holding, consider an AirTAC SAIL or BSAI variant. To match this ISO 15552 interchangeable cylinder exactly, specify: 125mm bore, 650mm stroke, 75mm adjustment, PT ports, Basic/FA/LB/TC/FTC/TCM1/TCM2 mounting, and no magnet.
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 SAIJ125BX650-75 FAQ
At 0.5 MPa operating pressure, this 125mm bore cylinder provides 6136N of push force and 5734N of pull force. If pressure is increased to 0.7 MPa, the push force rises to 8590N.
The rear adjuster acts as an external stop that lets you shorten the nominal 650mm stroke by up to 75mm, providing an effective travel window of 575-650mm. It only sets the travel end and does not lock the load without continuous air pressure.
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