Airtac SAIJ125 Adjustable Cylinder SAIJ125X50-40
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125X50-40 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
About the Airtac SAIJ125 Adjustable Cylinder SAIJ125X50-40
The AirTAC SAIJ125X50-40 is a double-acting ISO 15552 profile cylinder featuring a rear-mounted stroke adjuster. It provides a usable travel window of 10 to 50 mm, allowing you to dial back the nominal 50 mm stroke by up to 40 mm during commissioning. This bore size delivers a robust 6136 N push force at 0.5 MPa, making it suitable for heavy-duty positioning tasks.
The external adjuster acts purely as a mechanical stop to fine-tune the retract end position; it does not lock the load without live air pressure. For position holding, a SAIL or BSAI variant is required. This extruded aluminum barrel design includes sensor grooves on both sides for CMSE reed and DMSE electronic switches, though this specific SKU omits the magnet.
Airtac SAIJ125 Adjustable Cylinder SAIJ125X50-40 Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125X50-40 |
|---|---|
| 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 SAIJ125X50-40
| 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 SAIJ125X50-40 Is Used
Machine Setup & Changeover
Fine-tune the retract position on heavy machinery during product family changeovers without disassembling the pneumatic line.
Variable End Stops
Dial in the exact clamping depth on the fly using the 10 to 50 mm travel window to accommodate different material thicknesses.
Heavy-Duty Positioning
Leverage the 6136 N push force at 0.5 MPa to shift substantial jigs or pallets into place, then tweak the final stop position.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125X50-40 the Right Cylinder?
Choose this 125 mm bore when the 80 mm class (2513 N push at 0.5 MPa) is insufficient, but you want to avoid stepping up to the massive 160 mm bore. The adjustable stroke is ideal for product changeovers where the exact end-of-stroke varies by up to 40 mm, eliminating the need to physically swap cylinders or bolt on external stop blocks.
When ordering a replacement, verify the 50 mm nominal stroke, 40 mm adjustment range, PT tapered port, and the reduced SAIJ mounting set (Basic, FA, LB, TC, FTC, TCM1, TCM2). Because this is a large-bore cylinder operating at up to 30-500 mm/s, ensure your external guide can handle the side loads from the 32 mm carbon steel rod.
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 SAIJ125X50-40 FAQ
The rear adjuster screw lets you mechanically shorten the effective travel from 50 mm down to as little as 10 mm, providing a 40 mm adjustment window. It acts as a physical stop for the retract end and does not function as a lock, meaning live air pressure is still required to hold the load.
At a 0.5 MPa operating pressure, it provides 6136 N of push force and 5734 N of pull force. The maximum operating pressure is 1.0 MPa, which yields a maximum push force of 1251 kgf.
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Covers non-human-caused product damage.
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Standard models usually ship in 3-4 days.
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