Airtac SAIJ125 Adjustable Cylinder SAIJ125AX850-20
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125AX850-20 is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø125mm bore and 850mm 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
- Stroke850 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2
- CushionAdjustable, 40 mm
About the Airtac SAIJ125 Adjustable Cylinder SAIJ125AX850-20
The AirTAC SAIJ125X850-20 is a double-acting ISO 15552 profile cylinder engineered with a rear stroke adjuster, allowing you to dial back the nominal 850 mm travel by up to 20 mm. This creates a precise 830-850 mm usable window, enabling exact end-position tuning at commissioning without swapping out the entire unit or fabricating external stops. Delivering a robust 6136 N pull force at 0.5 MPa, it is built for heavy-duty positioning tasks.
This variant features a SUS420J2 stainless steel rod for superior corrosion resistance and uses PT tapered port threads. The extruded aluminum barrel incorporates sensor grooves on both sides, and while this specific SKU omits the magnet, the design readily accommodates AirTAC CMSE reed and DMSE electronic solid-state switches when position sensing is required. The rear adjuster functions purely as a mechanical stop to set the travel end and does not lock the load without live air pressure.
Airtac SAIJ125 Adjustable Cylinder SAIJ125AX850-20 Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125AX850-20 |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø125 mm |
| Stroke | 850 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 SAIJ125AX850-20
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 125 | Bore size in mm. |
| ×850 | 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 SAIJ125AX850-20 Is Used
Variable End-Stop Machining
Fine-tune the 830-850 mm travel window on the fly to accommodate different workpiece lengths without retooling the entire fixture.
Product Changeover Diverter
Adjust the rear stopper during line changeovers to alter the push-off distance for varying package dimensions quickly.
Heavy-Duty Press Setup
Leverage the 6136 N pull force at 0.5 MPa for substantial forming operations, dialing back the stroke to set precise bottoming depth.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125AX850-20 the Right Cylinder?
Selecting this 125 mm bore over a smaller 100 mm bore steps up your 0.5 MPa pull force from 3681 N to 6136 N, providing the necessary muscle for high-inertia loads. An adjustable stroke is chosen over a fixed SAI cylinder when you need variable end-stops for product changeovers or fine-tuning machine setup. If your application requires holding a load statically without continuous air pressure, note that this cylinder's adjuster is only a travel stop; you would instead need an SAIL locking cylinder or an external pilot-operated check valve.
When replacing an ISO 15552 cylinder, match the 125 mm bore, 850 mm stroke, 20 mm adjustment range, PT G1/2 port, and the Basic, FA, LB, TC, FTC, TCM1, or TCM2 mounting set. Because the stroke is 850 mm, the 32 mm piston rod will experience deflection and side-loading forces; always incorporate an external guide rail to prevent premature seal wear and binding.
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 SAIJ125AX850-20 FAQ
The rear adjuster screw acts as a mechanical stop, allowing you to shorten the effective stroke from 850 mm down to 830 mm. This 20 mm adjustment window is set during commissioning and does not lock the load without live air pressure.
At a 0.5 MPa operating pressure, the SAIJ125X850-20 provides 6136 N of pull force and 8590 N of push force. It can achieve up to 1251 kgf at its maximum 1.0 MPa pressure rating.
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