Airtac SAIJ125 Adjustable Cylinder SAIJ125AX120-100
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125AX120-100 is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø125mm bore and 120mm 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
- Stroke120 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2
- CushionAdjustable, 40 mm
About the Airtac SAIJ125 Adjustable Cylinder SAIJ125AX120-100
The AirTAC SAIJ125X120-100 is a double-acting ISO 15552 profile cylinder equipped with a rear stroke adjuster, allowing you to dial back the nominal 120 mm stroke by up to 100 mm. This creates a highly flexible 20 to 120 mm usable travel window, perfect for dialing in exact end positions during machine commissioning. It delivers a robust 6136 N push force at 0.5 MPa, making it well-suited for heavy-duty positioning tasks.
This variant features a SUS420J2 stainless steel rod for improved corrosion resistance and utilizes PT tapered port threads. The extruded aluminum barrel includes sensor grooves on both sides for CMSE reed or DMSE electronic switches, though this specific SKU is configured without a magnet. Remember that the rear adjuster acts purely as a mechanical stop to decelerate travel; it does not lock the load without live air pressure.
Airtac SAIJ125 Adjustable Cylinder SAIJ125AX120-100 Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125AX120-100 |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø125 mm |
| Stroke | 120 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 SAIJ125AX120-100
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 125 | Bore size in mm. |
| ×120 | 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 SAIJ125AX120-100 Is Used
Machine Setup & Changeover
Dial in the exact end position for new product runs using the rear screw, shifting the travel window from 20 to 120 mm without changing the cylinder.
Heavy Material Pushing
Leverage 6136 N of thrust at 0.5 MPa to index heavy pallets or push dense materials, fine-tuning the stroke to match varying load lengths.
Variable End-Stop Positioning
Establish precise mechanical stops for assembly presses, allowing operators to adjust the effective stroke on the fly to accommodate different part dimensions.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125AX120-100 the Right Cylinder?
Choose this 125 mm bore cylinder when your application requires the substantial thrust of the 125 class but demands on-site travel flexibility. If you need less force, stepping down to a 100 mm bore yields 3927 N at 0.5 MPa; stepping up to 160 mm provides 10053 N. The integrated 100 mm adjustment range is ideal for product changeovers on a packaging line, removing the need to physically swap cylinders or bolt on external stopper blocks.
Because the total stroke reaches 120 mm, ensure proper external guiding to manage side loads, as the 32 mm rod and M27x2 thread carry limits under heavy offset weight. For exact ISO 15552 dimensional interchangeability, match the 125 mm bore, 120 mm stroke, PT ports, and the Basic, FA, LB, TC, FTC, TCM1, or TCM2 mounting sets. If your setup requires true load holding without continuous air pressure, consider the SAIL locking cylinder or BSAI clamp-lock type instead of relying on the SAIJ adjuster.
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 SAIJ125AX120-100 FAQ
The nominal stroke is 120 mm, but the rear adjuster allows you to trim the effective travel back by up to 100 mm. This provides a usable stroke window of 20 to 120 mm, which is set mechanically at commissioning without needing external stops.
At 0.5 MPa, it provides 6136 N of push force and 5734 N of pull force. At a maximum operating pressure of 1.0 MPa, the push force reaches 11045 N.
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