Airtac SAIJ125 Adjustable Cylinder SAIJ125X70-30S
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125X70-30S 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 SAIJ125X70-30S
The AirTAC SAIJ125X70-30-S is a double-acting, single-rod ISO 15552 profile cylinder equipped with a rear stroke adjuster. It delivers 6136N of push force and 5734N of pull force at 0.5MPa, featuring a 70mm nominal stroke that can be fine-tuned down by up to 30mm. This creates a usable travel window between 40mm and 70mm, allowing you to dial in the exact end position during commissioning without adding external stops.
This model includes a magnet for CMSE reed and DMSE electronic sensors, which seat neatly into the sensor grooves on both sides of the extruded aluminum barrel. It uses a PT tapered port thread, a 32mm carbon steel rod with an M27x2 thread, and operates at speeds of 30-500mm/s. The rear adjuster acts purely as a travel stop for deceleration alongside the standard air cushions, meaning it will not hold a load without live air pressure.
Airtac SAIJ125 Adjustable Cylinder SAIJ125X70-30S Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125X70-30S |
|---|---|
| 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 SAIJ125X70-30S
| 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 SAIJ125X70-30S Is Used
Product Changeovers
Dial in the 40-70mm travel window on the fly when switching between product sizes on a packaging line, avoiding physical cylinder swaps.
End-Stop Tuning
Fine-tune the retract end position during machine commissioning to achieve precise mechanical alignment without external shims.
Heavy Forming
Leverage the 6136N push force at 0.5MPa for pressing or forming tasks where the exact bottoming position varies per batch.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125X70-30S the Right Cylinder?
Choose this 125mm bore when you need significantly more thrust than the 80mm option (which provides 2513N push at 0.5MPa), but do not require the extreme force of the 160mm class. The adjustable stroke is ideal for product changeovers on a line, letting you shift the end-stop dynamically rather than swapping a fixed-stroke SAI cylinder. If your machine requires true load-holding without continuous air pressure, you should look toward the SAIL or BSAI locking cylinder series instead of relying on this adjuster.
For an exact ISO 15552 replacement match, verify the 125mm bore, 70mm nominal stroke, 30mm adjustment range, PT port thread, and the -S magnet option. Mounting choices are limited to the SAIJ subset: Basic, FA, LB, TC, FTC, TCM1, and TCM2, omitting the FB, CA, CB, and CR styles found on other variants.
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 SAIJ125X70-30S FAQ
At 0.5MPa operating pressure, this 125mm bore cylinder provides 6136N of push force and 5734N of pull force. At the maximum 1.0MPa pressure, it can deliver up to 1251kgf.
The rear adjuster screw allows you to trim the 70mm nominal stroke back by up to 30mm, creating a usable travel window of 40-70mm. It functions as a mechanical stop for end-position tuning and does not lock the load without live air.
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