Airtac SAIJ125 Adjustable Cylinder SAIJ125X100-40
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125X100-40 is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø125mm bore and 100mm 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
- Stroke100 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2
- CushionAdjustable, 40 mm
About the Airtac SAIJ125 Adjustable Cylinder SAIJ125X100-40
The AirTAC SAIJ125X100-40 is a double-acting ISO 15552 profile cylinder equipped with a rear stroke adjuster, delivering 6136N of push force at 0.5MPa. By incorporating a 40mm adjustment range, this unit allows the effective travel to be dialed back from its 100mm nominal length, creating a precise 60-100mm usable window. This fine-tuning capability is ideal for optimizing end positions during commissioning without the need to physically swap out the cylinder.
The extruded aluminum barrel features sensor grooves on both sides, ready to accept CMSE or DMSE switches if a magnet is specified later. It uses a PT tapered port thread and a robust 32mm carbon steel rod with an M27x2 thread, providing high rigidity against side loads. The mounting hardware is limited to the SAIJ subset of Basic, FA, LB, TC, FTC, TCM1, and TCM2, deliberately omitting FB, CA, CB, and CR options.
Airtac SAIJ125 Adjustable Cylinder SAIJ125X100-40 Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125X100-40 |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø125 mm |
| Stroke | 100 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 SAIJ125X100-40
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 125 | Bore size in mm. |
| ×100 | 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 SAIJ125X100-40 Is Used
Variable End-Stop Positioning
Dial in the exact retraction point within the 60-100mm window to accommodate different material thicknesses or tooling lengths without changing the cylinder.
Machine Changeover
Quickly adjust the stroke length during product line changeovers by turning the rear screw, drastically reducing setup time and eliminating the need for external stopper blocks.
Heavy-Duty Clamping
Leverage the 6136N push force at 0.5MPa to secure heavy workpieces, using the adjustable stop to ensure the clamp bottoms out at the precise desired pressure point.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125X100-40 the Right Cylinder?
When configuring machinery, this 125mm bore is a significant step up from the 100mm option, which provides 3927N of push force at 0.5MPa. You would select this larger bore when needing 6136N of thrust to move heavier payloads reliably. The adjustable stroke is chosen over a fixed SAI cylinder when a process requires variable end-stops or frequent product-size changeovers, allowing operators to reposition the stopper mechanically rather than adding external physical stops.
For replacement, ensure the ISO 15552 footprint matches your existing mount, verify the 100mm nominal stroke, and confirm the PT port thread. Because the rear adjuster acts only as a travel stop and the air cushions handle deceleration, this cylinder will not hold a load without live air pressure. If your application requires true load-holding, consider the SAIL or BSAI series instead. Furthermore, while the 32mm rod handles substantial stress, any stroke over 300mm on larger bores requires external guide rails to prevent binding.
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 SAIJ125X100-40 FAQ
At 0.5MPa operating pressure, this 125mm bore cylinder generates 6136N of push force and 5734N of pull force. If pressure is increased to 0.7MPa, the push force rises to 8590N.
The rear adjuster acts as a mechanical stop that shortens the effective travel. For this 100mm nominal stroke cylinder, the -40 code means you can trim the stroke by up to 40mm, resulting in a usable travel window of 60 to 100mm.
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