Airtac SAIJ125 Adjustable Cylinder SAIJ125X105-75S
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125X105-75S is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø125mm bore and 105mm 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
- Stroke105 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2
- CushionAdjustable, 40 mm
About the Airtac SAIJ125 Adjustable Cylinder SAIJ125X105-75S
The AirTAC SAIJ125X105-75-S is a double-acting ISO 15552 profile cylinder equipped with a rear stroke adjuster. It features a carbon steel piston rod and a built-in magnet (-S) for position sensing with CMSE reed or DMSE electronic switches. By integrating a 75mm adjustment mechanism at the retract end, this model transforms a 105mm nominal stroke into a highly flexible 30-105mm usable travel window, allowing precise end-position tuning without external stops.
Delivering 6136N of push force at 0.5MPa and utilizing a G1/2 port, this 125mm bore cylinder handles heavy loads up to 11045N at 0.9MPa. The extruded aluminum barrel includes sensor grooves on both sides for straightforward switch mounting. It is essential to note the rear adjuster functions strictly as a travel stop to fine-tune deceleration, not as a load-holding lock; for fail-safe positioning without live air, a SAIL or BSAI variant is required.
Airtac SAIJ125 Adjustable Cylinder SAIJ125X105-75S Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125X105-75S |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø125 mm |
| Stroke | 105 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 SAIJ125X105-75S
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 125 | Bore size in mm. |
| ×105 | 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 SAIJ125X105-75S Is Used
Variable End-Stop Positioning
Dial in the exact retract distance for varying material thicknesses on a press, utilizing the 30-105mm travel window to accommodate multiple product sizes without changing hardware.
Machine Setup & Changeover
Speed up production line transitions by fine-tuning the stroke end-position at the rear adjuster, avoiding the downtime needed to swap out a fixed-stroke cylinder.
Product-Size Changes
Adapt automated handling lines to new package dimensions quickly by adjusting the stroke in the field, relying on the 125mm bore's 6136N force at 0.5MPa to move heavy loads reliably.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125X105-75S the Right Cylinder?
Selecting this SAIJ125X105-75-S model is optimal when an application requires significant end-position variability during machine setup or product changeover. The 75mm adjustment range on a 105mm stroke allows the effective travel to be dialed back to as little as 30mm. If your process demands less force, stepping down to a 100mm bore yields 3927N at 0.5MPa, whereas moving up to a 160mm bore provides 10053N. This adjustable-stroke design provides commissioning flexibility that a fixed-stroke SAI cylinder cannot match.
Because the 125mm bore operates at a maximum speed of 30-500mm/s and generates substantial thrust, proper mounting is critical. The SAIJ series supports a reduced mounting set including Basic, FA, LB, TC, FTC, TCM1, and TCM2 (omitting FB, CA, CB, and CR). When replacing an ISO 15552 cylinder, match the PT tapered port thread, the -S magnet requirement, and the chosen mounting accessory. For strokes of 300mm or more, an external guide is recommended to manage rod side-loading, though this 105mm unit manages well with its 32mm rod diameter and M27x2 thread.
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 SAIJ125X105-75S FAQ
At 0.5MPa operating pressure, the 125mm bore provides 6136N of push force and 5734N of pull force. If pressure is increased to 0.9MPa, the push force reaches 11045N.
The SAIJ125X105-75-S uses a rear adjusting screw to mechanically shorten the retract travel. With a 105mm nominal stroke and a 75mm adjustment code, the usable travel window can be fine-tuned anywhere from 30mm to 105mm during commissioning.
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