Airtac SAIJ125 Adjustable Cylinder SAIJ125BX280-75S
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125BX280-75S is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø125mm bore and 280mm 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
- Stroke280 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2
- CushionAdjustable, 40 mm
- No minimum order. A single piece can be ordered.
- Ready in 3–5 business days. That is the time we take to process the order and hand it to the carrier. Transit time after that depends on the destination.
About the Airtac SAIJ125 Adjustable Cylinder SAIJ125BX280-75S
The AirTAC SAIJ125X280-75-S is a double-acting, single-rod ISO 15552 profile cylinder equipped with a rear stroke adjuster. It delivers a robust 6136N push force at 0.5 MPa and features a 280mm nominal stroke that can be fine-tuned down by up to 75mm, yielding a usable travel window of 205-280mm. This built-in adjustability allows operators to dial in exact end positions during commissioning without swapping out the cylinder or adding external stops.
This model includes a SUS304 stainless steel rod (code B) for superior corrosion resistance and features a PT tapered port thread. The extruded aluminum barrel includes sensor grooves on both sides, and because this SKU carries the -S magnet option, it directly supports AirTAC CMSE reed and DMSE electronic solid-state switches for precise position detection. The rear adjuster acts purely as a travel stop to set the deceleration point and does not hold the load without live air pressure.
Airtac SAIJ125 Adjustable Cylinder SAIJ125BX280-75S Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125BX280-75S |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø125 mm |
| Stroke | 280 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 SAIJ125BX280-75S
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 125 | Bore size in mm. |
| ×280 | 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 SAIJ125BX280-75S Is Used
Product Size Changeovers
Quickly adapt a packaging line to different carton lengths by dialing the stroke back within the 205-280mm window, avoiding mechanical actuator swaps.
Heavy Pressing Setup
Leverage the 6136N thrust at 0.5 MPa for precise pressing operations, using the rear stopper to fine-tune the exact bottoming depth during machine commissioning.
Variable End-Stop Positioning
Ideal for automated assembly stations requiring flexible end-of-stroke positions, utilizing the PT port and SUS304 rod for durable, repeatable performance.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125BX280-75S the Right Cylinder?
Choose this 125mm bore when an application requires heavy thrust beyond the 3927N push force of the 100mm bore at 0.5 MPa, but without stepping up to the larger 160mm frame. The 75mm adjustment range is particularly valuable on automated lines handling varying product sizes, as it allows rapid changeovers simply by rotating the rear screw rather than replacing the entire actuator. If your process demands load holding without continuous air pressure, note that this adjustable stop is not a lock; you would need to look at the SAIL or BSAI series, or utilize an external pilot-operated check valve.
Because this is a true ISO 15552 profile cylinder, it is dimensionally interchangeable with other ISO 15552 cylinders of the same bore and stroke. To match this exact unit for a replacement, confirm the 125mm bore, 280mm stroke, 75mm adjustment, PT port thread, and the -S magnet. For any stroke of 280mm or greater, ensure an external guide is used to support the load and prevent excessive side-loading on the 32mm rod, despite its robust M27x2 thread. The available mounting set includes Basic, FA, LB, TC, FTC, TCM1, and TCM2.
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 SAIJ125BX280-75S FAQ
At 0.5 MPa operating pressure, this 125mm bore cylinder provides a push force of 6136N and a pull force of 5734N. At its maximum 1.0 MPa pressure, it can deliver up to 1251 kgf.
The rear adjuster screw acts as a mechanical stop, allowing you to shorten the 280mm nominal stroke by up to 75mm. This creates a usable travel window of 205-280mm for fine-tuning end positions without replacing the cylinder.
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