Airtac SAIJ125 Adjustable Cylinder SAIJ125AX650-50S
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125AX650-50S 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 SAIJ125AX650-50S
The AirTAC SAIJ125X650-50-S is a double-acting ISO 15552 profile cylinder equipped with a rear stroke adjuster, delivering 8590N of thrust at 0.7 MPa. The 50 mm adjustment code creates a usable travel window between 600 and 650 mm, allowing you to dial in the exact retract end-position during commissioning without adding external stops. This standard 650 mm stroke falls within the 1500 mm maximum limit for this bore.
Configuration highlights include a SUS420J2 stainless steel rod (material code A) for enhanced corrosion resistance and a built-in magnet (-S) for use with AirTAC CMSE reed and DMSE electronic sensors. The extruded aluminum barrel features sensor grooves on both sides for flexible switch mounting. Unlike a tie-rod build, this profile design integrates variable air cushions at both ends to decelerate heavy 125 mm bore loads smoothly across its 30-500 mm/s speed range.
Airtac SAIJ125 Adjustable Cylinder SAIJ125AX650-50S Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125AX650-50S |
|---|---|
| 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 SAIJ125AX650-50S
| 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 SAIJ125AX650-50S Is Used
Product Changeover Stops
Quickly reconfigure the retract end-position within the 600-650 mm window when adapting machinery to new packaging dimensions.
Heavy Press Assembly
Leverage 6136N of thrust at 0.5 MPa to seat large components, using the rear stop to prevent over-travel.
Commissioning Calibration
Fine-tune the final end-of-stroke position during initial machine setup without machining custom external spacers.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125AX650-50S the Right Cylinder?
Choose this 125 mm bore when an 80 mm bore is insufficient, stepping up from 3518N of push force at 0.5 MPa to a robust 6136N. The adjustable stroke is selected over a fixed SAI cylinder when a machine requires frequent product changeovers, letting operators fine-tune the retract distance on the fly. The rear adjuster acts purely as a mechanical stop to set the travel end; it does not lock or hold the load without live air. For position-holding requirements without continuous pressure, specify an SAIL or BSAI cylinder instead.
Because the 650 mm stroke exceeds the 300 mm threshold, the 32 mm rod and M27x2 thread require external guide rail support to prevent side-load damage on the piston. This SAIJ125X650-50-S variant features PT tapered ports and is dimensionally interchangeable with ISO 15552 cylinders. It supports a reduced mounting set of Basic, FA, LB, TC, FTC, TCM1, and TCM2, omitting FB, CA, CB, and CR brackets.
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 SAIJ125AX650-50S FAQ
This 125 mm bore cylinder provides 6136N of push force and 5734N of pull force at 0.5 MPa. At 0.7 MPa, the push force increases to 8590N.
The rear adjuster acts as a mechanical stop that trims the effective travel, creating a usable window between 600 and 650 mm. It sets the end position but does not lock the load without live air pressure.
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