Airtac SAIJ125 Adjustable Cylinder SAIJ125AX115-40
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125AX115-40 is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø125mm bore and 115mm 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
- Stroke115 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2
- CushionAdjustable, 40 mm
About the Airtac SAIJ125 Adjustable Cylinder SAIJ125AX115-40
The AirTAC SAIJ125X115-40 is a double-acting ISO 15552 profile cylinder featuring a rear-mounted stroke adjuster. It provides a nominal 115 mm travel that can be dialed back by up to 40 mm, yielding a precise 75-115 mm usable window for fine-tuning end positions at commissioning. In this configuration, the piston rod is SUS420J2 stainless steel (code A) for superior corrosion resistance, and ports are PT tapered thread.
Delivering 6136 N of pull force at 0.5 MPa and 8590 N at 0.7 MPa, it handles heavy loads within the 30-500 mm/s speed range. The extruded aluminum barrel includes sensor grooves on both sides. While the rear adjuster and variable air cushions decelerate the load, neither acts as a lock; for position holding without live air, consider SAIL or BSAI types.
Airtac SAIJ125 Adjustable Cylinder SAIJ125AX115-40 Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125AX115-40 |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø125 mm |
| Stroke | 115 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 SAIJ125AX115-40
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 125 | Bore size in mm. |
| ×115 | 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 SAIJ125AX115-40 Is Used
Machine Changeover
Dial in the exact 75-115 mm end-stop during product size transitions on a packaging line without changing cylinders.
Variable End-Stop Setup
Fine-tune the retract position at commissioning to perfect a crimping or pressing action, compensating for mechanical stack-up tolerances.
Heavy Assembly Positioning
Leverage the 6136 N pull force to move heavy jigs into a precise retracted position before initiating the next automated cycle.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125AX115-40 the Right Cylinder?
Select this 125 mm bore adjustable cylinder when your application requires exact end-position tuning during machine setup or product changeover, avoiding the need to swap out a fixed-stroke SAI cylinder or bolt on external stops. If your process requires less force, stepping down to a 100 mm bore yields 3681 N of pull at 0.5 MPa. To match ISO 15552 interchangeability, specify 125 mm bore, 115 mm stroke, 40 mm adjustment, PT port, and the SUS420J2 rod.
Because the 115 mm stroke is relatively short for this large bore, side-load stress is minimal compared to longer strokes, but the robust 32 mm rod and M27x2 thread handle high guide loads effectively. Remember that the rear adjuster is a mechanical stop, not a brake, so it will not hold the load safely without continuous air pressure.
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 SAIJ125AX115-40 FAQ
A rear screw stopper lets you shorten the 115 mm nominal stroke by up to 40 mm, creating a 75-115 mm adjustable travel window. It sets the end position but does not lock the load without live air.
At 0.5 MPa it provides 6136 N pull and 8590 N pull at 0.7 MPa. The maximum push force at 0.9 MPa is 11045 N.
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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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