Airtac SAIJ125 Adjustable Cylinder SAIJ125AX650-100
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125AX650-100 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 SAIJ125AX650-100
The AirTAC SAIJ125X650-100 is a double-acting ISO 15552 profile cylinder equipped with a rear stroke adjuster, providing a usable travel window of 550 to 650 mm. Operating at 0.5 MPa, it generates 6136 N of push force and 5734 N of pull force, making it suitable for heavy-duty positioning tasks. This specific SKU features a SUS420J2 stainless steel rod (material code A) for enhanced corrosion resistance and utilizes PT tapered port threads.
Instead of relying on fixed end stops, the integrated rear screw mechanism allows operators to fine-tune the retract position during commissioning or product changeovers without swapping the cylinder. The extruded aluminum barrel includes sensor grooves on both sides for flexible mounting of CMSE or DMSE switches, though this base configuration ships without a magnet. The adjuster acts purely as a travel stop and does not hold the load without continuous live air pressure.
Airtac SAIJ125 Adjustable Cylinder SAIJ125AX650-100 Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125AX650-100 |
|---|---|
| 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 SAIJ125AX650-100
| 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 SAIJ125AX650-100 Is Used
Variable End-Stop Tuning
Dial in the exact retract position within the 550-650 mm window during machine setup, eliminating the need to fabricate and install external spacer blocks.
Product Size Changeovers
Quickly adapt a heavy-duty production line to accommodate different material lengths by adjusting the rear stopper screw on the fly.
Heavy-Duty Positioning
Leverage the 6136 N push force at 0.5 MPa to move substantial masses, relying on the SUS420J2 stainless steel rod for durability in demanding environments.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125AX650-100 the Right Cylinder?
Selecting this 125 mm bore cylinder makes sense when an application requires substantial thrust—such as 6136 N at 0.5 MPa—but demands variable end-position tuning. If an installation needs less force, stepping down to a 100 mm bore provides 3927 N of push force at the same pressure, whereas moving up to a 160 mm bore yields 10053 N for heavier loads. The adjustable 100 mm window is ideal for production lines running mixed product sizes, allowing rapid changeovers without adding external mechanical stops.
Because the 650 mm stroke is substantial, the 32 mm diameter rod and M27x2 thread must be properly supported to prevent excessive side-loading; an external guide mechanism is recommended for unsupported lengths. For holding loads without live air pressure, this cylinder is insufficient as the rear adjuster is not a lock—consider an AirTAC SAIL or BSAI model for positive holding requirements. When replacing an ISO 15552 cylinder, verify the 125 mm bore, 650 mm stroke, 100 mm adjustment range, PT G1/2 port, and the specific mounting bracket style, noting SAIJ supports Basic, FA, LB, TC, FTC, TCM1, and TCM2 mounts.
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 SAIJ125AX650-100 FAQ
The rear adjuster screw allows you to shorten the effective stroke by up to 100 mm, creating a usable travel window between 550 mm and 650 mm. This stopper fine-tunes the end position but does not lock the load without live air pressure.
At an operating pressure of 0.5 MPa, the SAIJ125X650-100 provides 6136 N of push force and 5734 N of pull force. At the maximum pressure of 0.9 MPa, the push force increases to 11045 N.
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Standard models usually ship in 3-4 days.
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