Airtac SAIJ125 Adjustable Cylinder SAIJ125X850-30S
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125X850-30S 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 SAIJ125X850-30S
The AirTAC SAIJ125X850-30-S is a double-acting ISO 15552 profile cylinder equipped with a rear stroke adjuster, providing a usable travel window of 820 to 850 mm. Built with a carbon steel rod and a -S magnet for CMSE reed and DMSE electronic sensors, it delivers a robust 8590 N pull force at 0.7 MPa. The extruded aluminum barrel features sensor grooves on both sides for flexible switch mounting.
This 125 mm bore model uses PT tapered G1/2 ports and achieves a maximum thrust of 11045 N at 0.9 MPa. The rear adjustment screw acts purely as a mechanical stop to trim the end position, meaning it cannot hold the load without live air pressure. For secure load-holding, consider the SAIL or BSAI series instead.
Airtac SAIJ125 Adjustable Cylinder SAIJ125X850-30S Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125X850-30S |
|---|---|
| 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 SAIJ125X850-30S
| 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 SAIJ125X850-30S Is Used
Variable End-Stop Tuning
Dial in the exact retract distance within the 820-850 mm window during machine setup to accommodate varying product lengths on the fly.
Product Changeover Adjustment
Quickly reconfigure the stroke end-position for new packaging sizes without installing external physical stops or changing the cylinder.
Heavy-Duty Positioning
Leverage the 8590 N pull at 0.7 MPa to move heavy pallets or fixtures, using the rear screw to fine-tune the final resting position.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125X850-30S the Right Cylinder?
Choose this adjustable-stroke model when your application requires precise end-position tuning during commissioning or product changeover without swapping out the entire cylinder. If you need less force, stepping down to an 80 mm bore yields 2268 N of pull at 0.5 MPa. Because the 850 mm stroke is substantial, the 32 mm rod diameter requires an external guide to prevent excessive side-load wear on the seals. Mounting options are limited to Basic, FA, LB, TC, FTC, TCM1, and TCM2, omitting the FB, CA, CB, and CR styles. For fixed travel without the rear adjuster, the standard SAI series is the direct alternative.
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 SAIJ125X850-30S FAQ
At 0.7 MPa operating pressure, this 125 mm bore cylinder provides 8590 N of pull force and 8590 N of push force. It can reach a maximum thrust of 11045 N at 0.9 MPa.
The rear adjuster screw allows you to shorten the effective travel by up to 30 mm, creating an adjustable 820 to 850 mm stroke window. This mechanical stop fine-tunes the end position but does not lock the load without continuous air pressure.
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Standard models usually ship in 3-4 days.
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