Airtac SAIJ125 Adjustable Cylinder SAIJ125X105-40S
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125X105-40S is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø125mm bore and 105mm 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
- Stroke105 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2
- CushionAdjustable, 40 mm
About the Airtac SAIJ125 Adjustable Cylinder SAIJ125X105-40S
The AirTAC SAIJ125X105-40-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, making it suited for heavy-duty positioning. By turning the external stopper screw, you can fine-tune the effective travel window down from the 105mm nominal stroke to a 65-105mm range. This on-machine tuning eliminates the need to swap cylinders or bolt on external stops during product changeovers.
This unit features a standard carbon steel piston rod and a PT tapered port thread. The extruded aluminum barrel incorporates sensor grooves on both sides, and because this SKU includes the -S magnet option, it is fully compatible with AirTAC CMSE reed and DMSE solid-state switches for precise end-of-stroke detection. The rear adjuster acts purely as a travel stop and deceleration point, meaning it will not hold the load without live air pressure.
Airtac SAIJ125 Adjustable Cylinder SAIJ125X105-40S Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125X105-40S |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø125 mm |
| Stroke | 105 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 SAIJ125X105-40S
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 125 | Bore size in mm. |
| ×105 | 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 SAIJ125X105-40S Is Used
Variable End-Stop Positioning
Dial in the exact 65 to 105mm travel distance required for pressing or clamping operations without replacing the actuator.
Machine Setup and Changeover
Quickly reconfigure the rear stopper to accommodate new product dimensions on automated assembly lines during format changes.
Heavy-Duty End Detection
Leverage the 6136N thrust and integrated -S magnet with DMSE sensors for reliable end-of-stroke signaling in robust industrial environments.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125X105-40S the Right Cylinder?
Choose this 125mm bore when your application requires significantly more force than a 100mm cylinder (which provides 3927N at 0.5 MPa). If 6136N is excessive for your payload, stepping down to an 80mm bore yields 2513N, offering a lighter, faster alternative. The adjustable stroke is ideal for variable end-stop requirements and commissioning fine-tuning, providing flexibility that a fixed-stroke SAI cylinder cannot match. To replace an existing ISO 15552 cylinder, verify your bore, stroke, 40mm adjustment requirement, PT port type, mounting style, and magnet needs.
For load-holding applications without continuous air pressure, note that this cylinder's rear adjuster and air cushions function only as stops, not as locks. You must integrate an external rod lock, a pilot-operated check valve, or select an AirTAC SAIL or BSAI clamp-lock cylinder. Additionally, the 32mm rod diameter and M27x2 rod thread provide excellent resistance to side loads, but any stroke exceeding 300mm requires an external guide to prevent rod deflection.
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 SAIJ125X105-40S FAQ
At an operating pressure of 0.5 MPa, this 125mm bore cylinder generates 6136N of push force and 5734N of pull force. At 0.9 MPa, the push force increases to 11045N.
The rear adjuster screw allows you to shorten the 105mm nominal stroke by up to 40mm. This creates a usable travel window ranging from 65mm to 105mm, enabling precise end-position tuning at commissioning without swapping the cylinder.
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