Airtac SAIJ125 Adjustable Cylinder SAIJ125X85-30S
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125X85-30S is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø125mm bore and 85mm 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
- Stroke85 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2
- CushionAdjustable, 40 mm
About the Airtac SAIJ125 Adjustable Cylinder SAIJ125X85-30S
The AirTAC SAIJ125X85-30-S is a double-acting ISO 15552 profile cylinder equipped with a rear stroke adjuster, allowing you to fine-tune the effective travel window from 55 to 85 mm without adding external stops. Delivering 6136 N of push force at 0.5 MPa, it handles heavy-duty positioning with precision. The carbon steel rod and M27x2 thread provide robust resistance to side loads, while the PT tapered port ensures a tight, reliable pneumatic seal.
Because this unit includes a magnet (-S), it integrates seamlessly with AirTAC CMSE reed and DMSE electronic sensors mounted into the dual-sided extruded barrel grooves. The rear adjuster acts purely as a mechanical stop to decelerate the end-of-stroke position, so you must maintain live air pressure to hold a load. For true drop-prevention holding, consider the SAIL or BSAI series instead.
Airtac SAIJ125 Adjustable Cylinder SAIJ125X85-30S Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125X85-30S |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø125 mm |
| Stroke | 85 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 SAIJ125X85-30S
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 125 | Bore size in mm. |
| ×85 | 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 SAIJ125X85-30S Is Used
Variable End-Stop Positioning
Dial in the 55 to 85 mm travel window during machine setup to accommodate varying part dimensions without physically swapping cylinders.
Heavy-Duty Changeover
Use the rear screw to rapidly adjust the retract end-position on production lines processing different product sizes, reducing commissioning time.
Sensor-Integrated Assembly
Leverage the built-in magnet with DMSE solid-state sensors to confirm end-stroke positions in automated assembly lines requiring heavy thrust.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125X85-30S the Right Cylinder?
Choose this 125 mm bore when a 100 mm bore (offering 3927 N at 0.5 MPa) lacks the necessary thrust, but a 160 mm bore is oversized. The 30 mm adjustment range is ideal for product changeovers where the exact end position varies slightly, saving you from swapping out a fixed-stroke SAI cylinder. When replacing an ISO 15552 unit, match the 85 mm stroke, 30 mm adjuster, PT G1/2 port, and the -S magnet. The SAIJ mounting set includes Basic, FA, LB, TC, FTC, TCM1, and TCM2, omitting FB, CA, CB, and CR.
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 SAIJ125X85-30S FAQ
At 0.5 MPa operating pressure, this 125 mm bore cylinder provides 6136 N of push force and 5734 N of pull force. At 0.7 MPa, the push force increases to 8590 N.
The rear adjuster screw lets you shorten the nominal 85 mm stroke by up to 30 mm, creating a usable travel window of 55 to 85 mm. The adjuster functions as a mechanical stop and does not lock the load without live air pressure.
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