Airtac SAIJ125 Adjustable Cylinder SAIJ125BX50-40
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125BX50-40 is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø125mm bore and 50mm 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
- Stroke50 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 SAIJ125BX50-40
The AirTAC SAIJ125X50-40 is a double-acting ISO 15552 profile cylinder featuring a rear stroke adjuster. It provides a robust 6136N push force at 0.5MPa and uses a PT G1/2 port. The built-in stopper allows you to trim the 50mm nominal stroke back by up to 40mm, creating a precise 10-50mm usable travel window for exact end-position tuning at commissioning.
This model is equipped with a SUS304 stainless steel rod for superior corrosion resistance and features a 32mm rod diameter with an M27x2 thread. The extruded aluminum barrel includes sensor grooves on both sides, though this specific SKU lacks a magnet. The rear screw acts purely as a travel stop to fine-tune deceleration, meaning it will not hold a load without live air pressure.
Airtac SAIJ125 Adjustable Cylinder SAIJ125BX50-40 Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125BX50-40 |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø125 mm |
| Stroke | 50 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 SAIJ125BX50-40
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 125 | Bore size in mm. |
| ×50 | 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 SAIJ125BX50-40 Is Used
Product Size Changeover
Dial in the 10-50mm travel window during format changeovers on packaging lines without physically replacing the cylinder.
Machine Setup Tuning
Fine-tune the end position of high-force actuators during commissioning to perfectly strike mechanical stops.
Variable End Stops
Provide adjustable physical endpoints for heavy-duty clamping or pressing tasks requiring precise positional limits.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125BX50-40 the Right Cylinder?
Choose this 125mm bore cylinder when an application demands high thrust (6136N push at 0.5MPa) alongside variable end-stops. If you need less force, stepping down to a 100mm bore yields 3927N, while moving up to a 160mm bore provides 10053N. The adjustable stroke is ideal for product-size changeovers on a line, eliminating the need to swap cylinders or add external stops.
For an exact ISO 15552 replacement match, verify the 50mm stroke, 40mm adjustment range, PT G1/2 port, and mounting choice (Basic, FA, LB, TC, FTC, TCM1, or TCM2). Remember that the rear adjuster only sets the travel end; for load-holding without live pressure, consider an external rod lock or the AirTAC SAIL lock cylinder.
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 SAIJ125BX50-40 FAQ
At 0.5MPa operating pressure, this 125mm bore cylinder provides 6136N of push force and 5734N of pull force. At 0.7MPa, the push force increases to 8590N.
The rear adjuster acts as a mechanical stop, allowing you to shorten the 50mm nominal stroke by up to 40mm. This results in a usable travel window of 10-50mm, which can be fine-tuned during setup without altering the air cushion.
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1-Year Warranty
Covers non-human-caused product damage.
Fast Dispatch
Standard models are processed and dispatched in 3-5 business days.
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Most inquiries answered within 7-8 hours.
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