Airtac SAIJ125 Adjustable Cylinder SAIJ125AX275-40
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125AX275-40 is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø125mm bore and 275mm 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
- Stroke275 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2
- CushionAdjustable, 40 mm
About the Airtac SAIJ125 Adjustable Cylinder SAIJ125AX275-40
The AirTAC SAIJ125X275-40 is a double-acting ISO 15552 profile cylinder featuring a rear-mounted stroke adjuster that allows you to trim the effective travel back by up to 40 mm, creating a precise 235-275 mm usable window for product changeovers without swapping hardware. It delivers robust thrust, generating 6136 N of push force and 5734 N of pull force at 0.5 MPa. The extruded aluminum barrel includes sensor grooves on both sides, though this specific configuration omits the magnet, so external position sensing is not supported without modification.
This model is built with a SUS420J2 stainless steel rod (option A) for improved corrosion resistance and utilizes PT tapered port threads. The rear stopper mechanism functions purely as a travel end-limit and deceleration point alongside the adjustable air cushions; it does not lock or hold the load without live air pressure. For true load-holding requirements, consider the SAIL or BSAI series instead.
Airtac SAIJ125 Adjustable Cylinder SAIJ125AX275-40 Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125AX275-40 |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø125 mm |
| Stroke | 275 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 SAIJ125AX275-40
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 125 | Bore size in mm. |
| ×275 | 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 SAIJ125AX275-40 Is Used
Press Depth Tuning
Dial in the exact end-position during machine commissioning by trimming up to 40 mm off the stroke, ensuring precise pressing force without adding external mechanical stops.
Product Changeover
Adapt a single assembly station to varying product sizes by adjusting the retract travel window from 235 to 275 mm on the fly, reducing downtime between production runs.
Heavy Load Positioning
Leverage the 6136 N of push force at 0.5 MPa to move substantial masses while fine-tuning the deceleration point using the rear adjuster and integrated air cushions.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125AX275-40 the Right Cylinder?
Select this 125 mm bore cylinder when an application requires heavy thrust combined with variable end-stops, such as dialing in a precise pressing depth during machine setup. If your process needs less force, stepping down to the 100 mm bore yields 3927 N of push force at 0.5 MPa, while moving up to the 160 mm bore provides 10053 N for heavier loads. The SAIJ125X275-40 is dimensionally interchangeable per ISO 15552, using a reduced mounting set of Basic, FA, LB, TC, FTC, TCM1, and TCM2 (omitting FB, CA, CB, and CR). To match this exact configuration, specify the 125 mm bore, 275 mm stroke, 40 mm adjustment, PT port threads, SUS420J2 rod, and no magnet.
Because the nominal stroke is 275 mm, the 32 mm diameter rod and M27x2 rod thread will experience amplified side loads if the assembly is misaligned. For any stroke of 300 mm or more, adding an external guide is highly recommended to prevent premature seal wear and rod bending.
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 SAIJ125AX275-40 FAQ
At a standard operating pressure of 0.5 MPa, this 125 mm bore cylinder generates 6136 N of push force and 5734 N of pull force. At its maximum rated pressure of 1.0 MPa, it can deliver up to 1251 kgf of push force.
The rear-mounted adjuster acts as a mechanical stop that lets you shorten the 275 mm nominal stroke by up to 40 mm, providing a usable travel window of 235-275 mm. It sets the end-position and deceleration point but does not lock the load without continuous air pressure.
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