Airtac SAIJ125 Adjustable Cylinder SAIJ125AX650-40S
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125AX650-40S 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 SAIJ125AX650-40S
The AirTAC SAIJ125X650-40-S is a double-acting ISO 15552 profile cylinder featuring a rear stroke adjuster. It provides a 610 to 650 mm usable travel window, allowing you to dial back the nominal 650 mm stroke by up to 40 mm during commissioning without adding external stops. It delivers 6133 N push force at 0.5 MPa, scaling up to 11045 N at 0.9 MPa for heavy positioning tasks.
This unit includes a SUS420J2 stainless steel rod (option A) for improved corrosion resistance and carries the -S magnet option for direct compatibility with CMSE reed and DMSE electronic sensors. The extruded aluminum barrel features sensor grooves on both sides. The rear adjuster acts purely as a travel stop and does not hold the load without live air; for true load-holding without pressure, consider an external rod lock or the SAIL series.
Airtac SAIJ125 Adjustable Cylinder SAIJ125AX650-40S Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125AX650-40S |
|---|---|
| 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 SAIJ125AX650-40S
| 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 SAIJ125AX650-40S Is Used
Heavy Product Changeover
Adjusts the 610-650 mm retract stop on the fly to handle varying large product sizes on a packaging line without mechanical rebuild.
Machine Setup Tuning
Dials in the exact end-of-stroke position during commissioning, absorbing mechanical tolerances without fabricating custom spacer blocks.
Heavy Material Diverting
Leverages 11045 N of thrust at 0.9 MPa to push heavy pallets or assemblies off a conveyor, using the rear stop to set the divert distance.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125AX650-40S the Right Cylinder?
Choose this 125 mm bore when a 100 mm cylinder (offering 3927 N at 0.5 MPa) lacks the thrust for your heaviest changeover pushes, but a 160 mm bore is physically oversized. The 40 mm adjustment window is ideal for product size changeovers on a line, letting you fine-tune the retract end position on the fly rather than swapping a fixed-stroke SAI cylinder. To replace an ISO 15552 cylinder, match the 125 mm bore, 650 mm stroke, PT tapered ports, and the -S magnet requirement.
Because the 650 mm stroke is substantial, the 32 mm rod diameter and M27x2 thread will carry high side loads, yet an external guide rail is still recommended to prevent rod sag and premature seal wear. The SAIJ mounting set includes Basic, FA, LB, TC, FTC, TCM1, and TCM2, omitting the FB, CA, CB, and CR variants found in some standard lines.
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 SAIJ125AX650-40S FAQ
At 0.5 MPa it provides 6136 N of push force and 5734 N of pull force. At 0.9 MPa, the push force increases to 11045 N.
The nominal stroke is 650 mm, but the rear adjuster allows you to shorten the effective travel by up to 40 mm, creating a 610 to 650 mm usable window for fine-tuning end positions.
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