Airtac SAIJ125 Adjustable Cylinder SAIJ125AX70-30S
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125AX70-30S is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø125mm bore and 70mm 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
- Stroke70 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2
- CushionAdjustable, 40 mm
About the Airtac SAIJ125 Adjustable Cylinder SAIJ125AX70-30S
The AirTAC SAIJ125X70-30-S is a double-acting ISO 15552 profile cylinder featuring a rear stroke adjuster. It provides a usable travel window of 40-70 mm, letting you dial back the 70 mm nominal stroke by up to 30 mm during machine commissioning. It delivers 6136 N of push force at 0.5 MPa, making it suited for heavy positioning tasks.
This SKU features a SUS420J2 stainless steel rod for corrosion resistance and includes a magnet for CMSE reed and DMSE electronic sensors. The rear screw acts as a travel stop for end-position tuning, not a lock; for load-holding without live air, use an external rod lock or AirTAC SAIL cylinder.
Airtac SAIJ125 Adjustable Cylinder SAIJ125AX70-30S Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125AX70-30S |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø125 mm |
| Stroke | 70 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 SAIJ125AX70-30S
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 125 | Bore size in mm. |
| ×70 | 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 SAIJ125AX70-30S Is Used
Product Changeover Tuning
Dial the end-stop back by up to 30 mm to accommodate new package lengths on a packaging line without physically replacing the cylinder.
Heavy Press Positioning
Leverage 6136 N of thrust at 0.5 MPa to seat heavy components, using the rear stop to fine-tune the final pressing depth accurately.
Assembly End-Stop Setup
Set precise 40 to 70 mm travel limits during machine commissioning to prevent overtravel damage to delicate workpieces.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125AX70-30S the Right Cylinder?
Choose this 125 mm bore when a 100 mm bore (3927 N push at 0.5 MPa) lacks thrust for heavy product handling. The adjustable 40-70 mm window is ideal for product-size changeovers, avoiding the need to swap fixed-stroke SAI cylinders. To replace this unit, match the 125 mm bore, 70 mm stroke, 30 mm adjustment, PT tapered ports, and -S magnet.
Because the stroke is under 300 mm, side-load stress is minimal, but long unsupported loads still need an external guide. The mounting set is limited to Basic, FA, LB, TC, FTC, TCM1, and TCM2, omitting FB and rear pivot options.
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 SAIJ125AX70-30S FAQ
At 0.5 MPa operating pressure, this 125 mm bore cylinder provides 6136 N of push force and 5734 N of pull force. It can deliver up to 1251 kgf at its maximum 1.0 MPa pressure.
The rear adjuster screw lets you shorten the 70 mm nominal stroke by up to 30 mm, creating a 40-70 mm usable travel window. The adjuster acts only as a mechanical stop for end-position tuning and does not lock the load without live air pressure.
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