Airtac SAIJ125 Adjustable Cylinder SAIJ125AX850-100
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125AX850-100 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 SAIJ125AX850-100
The AirTAC SAIJ125X850-100 is a double-acting ISO 15552 profile cylinder featuring a rear-mounted stroke adjuster. It provides a usable travel window of 750 to 850 mm, allowing you to dial back the nominal 850 mm stroke by up to 100 mm during commissioning. Delivering 6136 N of pull force at 0.5 MPa, it handles heavy-duty positioning with precision.
This variant uses a SUS420J2 stainless steel rod (material code A) for enhanced corrosion resistance. The extruded aluminum barrel incorporates sensor grooves on both sides, ready for DMSE electronic or CMSE reed switches if a magnet is specified later. It operates at speeds of 30-500 mm/s and uses PT tapered G1/2 ports.
Airtac SAIJ125 Adjustable Cylinder SAIJ125AX850-100 Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125AX850-100 |
|---|---|
| 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 SAIJ125AX850-100
| 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 SAIJ125AX850-100 Is Used
Long-Stroke Machine Setup
Fine-tune the 850 mm travel down to 750 mm during equipment commissioning to achieve exact positioning without machining new hard stops.
Variable Product Changeover
Quickly adapt the end-of-stroke position for different sized products on a packaging line using the 100 mm rear adjustment screw.
Heavy-Duty Positioning
Leverage the 6136 N pull force to move heavy jigs or fixtures into place, relying on the stainless steel rod for durability.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125AX850-100 the Right Cylinder?
Choose this 125 mm bore when a 100 mm bore falls short on thrust, stepping up from 3927 N to 6136 N of pull force at 0.5 MPa. The 100 mm adjustment range is ideal for product changeovers on long-stroke machinery, letting you set variable end stops without swapping the cylinder or adding external stops. For any stroke of 850 mm, an external guide is strongly recommended to manage side loads and prevent rod binding over that extended distance.
This SAIJ model supports the reduced mounting set (Basic, FA, LB, TC, FTC, TCM1, TCM2), omitting FB, CA, CB, and CR brackets. Remember that the rear adjuster acts only as a travel stop to set deceleration, not as a lock; it will not hold a load without live air. For true load-holding without pressure, look to an external rod lock or the AirTAC SAIL and BSAI series.
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 SAIJ125AX850-100 FAQ
At 0.5 MPa operating pressure, this 125 mm bore cylinder provides 6136 N of pull force and 8590 N of push force at 0.7 MPa. It reaches a maximum thrust of 1251 kgf at 1.0 MPa.
The rear adjuster acts as a mechanical stop that lets you shorten the effective travel from the nominal 850 mm down to 750 mm. This creates a 750-850 mm adjustable window for fine-tuning end positions without replacing the cylinder.
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