Airtac SAIJ125 Adjustable Cylinder SAIJ125X140-30
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125X140-30 is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø125mm bore and 140mm 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
- Stroke140 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2
- CushionAdjustable, 40 mm
About the Airtac SAIJ125 Adjustable Cylinder SAIJ125X140-30
The AirTAC SAIJ125X140-30 is a double-acting ISO 15552 profile cylinder equipped with a rear mechanical stopper, allowing you to dial back the nominal 140 mm stroke by up to 30 mm. This yields a usable travel window of 110-140 mm, allowing precise end-position tuning at commissioning without swapping out the barrel or adding external stops. In the 125 mm bore class, it delivers 6136 N of push force and 5734 N of pull force at 0.5 MPa, making it suited for heavy-duty positioning tasks.
The adjuster functions strictly as a travel stop that works alongside the standard variable air cushions at both ends to decelerate the load; it does not lock the rod or hold a load without live air pressure. For position holding without continuous air, you would need a related type like the SAIL or BSAI. This unit features a carbon steel rod, a PT tapered port, and an extruded aluminum barrel with sensor grooves on both sides for mounting CMSE reed or DMSE electronic switches.
Airtac SAIJ125 Adjustable Cylinder SAIJ125X140-30 Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125X140-30 |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø125 mm |
| Stroke | 140 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 SAIJ125X140-30
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 125 | Bore size in mm. |
| ×140 | 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 SAIJ125X140-30 Is Used
Product Changeover Stops
Quickly dial back the stroke from 140 mm to 110 mm on a packaging line when switching to a smaller carton size, avoiding the need to physically swap cylinders.
Commissioning Fine-Tuning
Micro-adjust the rear stopper to perfectly seat heavy components against a backstop without reprogramming the entire pneumatic motion control system.
Heavy-Duty Positioning
Leverage the 6136 N of push force at 0.5 MPa to move heavy pallets or industrial fixtures into exact working positions before a secondary operation begins.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125X140-30 the Right Cylinder?
Choose this 125 mm bore when your application requires high thrust—stepping down to an 80 mm bore drops the 0.5 MPa push force to 2513 N, whereas this SAIJ provides 6136 N at the same pressure. The adjustable stroke is selected over a fixed SAI cylinder when a machine requires variable end-stops for product changeovers or fine-tuning during setup. To match this ISO 15552 footprint, specify a 125 mm bore, 140 mm stroke, 30 mm adjustment, PT port, and your required mounting from the SAIJ subset: Basic, FA, LB, TC, FTC, TCM1, or 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 SAIJ125X140-30 FAQ
The rear adjuster acts as a mechanical stop that lets you shorten the effective stroke from its nominal 140 mm down to 110 mm. This provides a 110-140 mm travel window for fine-tuning end positions during setup. The adjuster only sets the travel end and does not lock the load without live air pressure.
At 0.5 MPa, this 125 mm bore cylinder provides 6136 N of push force and 5734 N of pull force. At the maximum operating pressure of 1.0 MPa, the push force reaches 11045 N.
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