Airtac SAIJ125 Adjustable Cylinder SAIJ125X70-10
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125X70-10 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 SAIJ125X70-10
The AirTAC SAIJ125X70-10 is a double-acting ISO 15552 profile cylinder featuring a rear stroke adjuster that allows you to trim the nominal 70 mm travel back by up to 10 mm. This yields a precise 60-70 mm usable stroke window, enabling exact end-position tuning at commissioning without adding external stops. Built with a carbon steel piston rod and PT tapered ports, it delivers a robust 6136 N push force at 0.5 MPa.
This model omits the FB, CA, CB, and CR mounts, offering a streamlined SAIJ mounting set of Basic, FA, LB, TC, FTC, TCM1, and TCM2. The rear adjuster acts purely as a travel stop for deceleration, not a lock, so it will not hold the load without live air pressure. For position holding without pressure, consider the SAIL or BSAI variants.
Airtac SAIJ125 Adjustable Cylinder SAIJ125X70-10 Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125X70-10 |
|---|---|
| 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 SAIJ125X70-10
| 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 SAIJ125X70-10 Is Used
Machine Changeover
Dial in the 60-70 mm travel window during product size transitions without replacing the cylinder or bolting on external stops.
End-Position Tuning
Use the rear adjuster screw to precisely set the retract end-stop during commissioning for high-accuracy heavy-duty pressing.
Heavy-Duty Positioning
Leverage the 6136 N push force at 0.5 MPa to move substantial masses while maintaining the flexibility to trim the stroke by up to 10 mm.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125X70-10 the Right Cylinder?
Choose this 125 mm bore when you need heavy thrust that exceeds the 3927 N push force of the 100 mm version, but do not require the 10053 N output of the 160 mm class. The adjustable 60-70 mm travel window is ideal for product-size changeovers on a line, allowing you to fine-tune the end stop quickly instead of physically swapping a fixed-stroke SAI cylinder. Because the stroke is 70 mm, side-load risks are minimal, but an external guide remains recommended for heavy lateral loads. To match an ISO 15552 replacement, specify bore 125, stroke 70, adjustment 10, PT ports, and the required mounting accessory.
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 SAIJ125X70-10 FAQ
At a 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 70 mm stroke by up to 10 mm, creating a 60-70 mm usable travel window. This stopper only sets the end position and does not lock or hold the load without live air pressure.
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