Airtac SAIJ125 Adjustable Cylinder SAIJ125AX70-50
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125AX70-50 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 SAIJ125AX70-50
The AirTAC SAIJ125X70-50 is a double-acting ISO 15552 profile cylinder featuring a rear-mounted stroke adjuster. It provides a usable travel window of 20 to 70 mm by allowing you to trim the nominal 70 mm stroke back by up to 50 mm. This bore delivers robust thrust, generating 8590 N of push force at 0.7 MPa, making it well-suited for heavy-duty positioning tasks.
This variant uses a SUS420J2 stainless steel rod for enhanced durability against moisture and minor corrosion. The extruded aluminum barrel includes sensor grooves on both sides for flexible switch placement. The rear adjuster acts purely as a mechanical stop to set the end position and does not hold the load without live air pressure.
Airtac SAIJ125 Adjustable Cylinder SAIJ125AX70-50 Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125AX70-50 |
|---|---|
| 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 SAIJ125AX70-50
| 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 SAIJ125AX70-50 Is Used
Heavy Press Tuning
Dial in the exact 20-70 mm travel window during machine setup to accommodate varying material thicknesses without swapping out the entire cylinder.
Product Changeover
Quickly adjust the retract stop on the line when switching to a new product size, using the rear screw to fine-tune the end position.
Variable End Stops
Set precise retract distances for heavy-duty assembly presses where the nominal stroke needs to be restricted based on the specific jig in use.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125AX70-50 the Right Cylinder?
Select this 125 mm bore cylinder when an application requires substantial force combined with variable end-position tuning at commissioning. If you need less thrust, stepping down to an 80 mm bore yields 3518 N of push force at 0.7 MPa. Choose this adjustable SAIJ over a fixed SAI model when you need to dial in the exact retract distance during product changeovers without adding external stops. For load-holding without continuous air pressure, use an SAIL or BSAI cylinder instead.
This model features a PT tapered port thread and omits the FB, CA, CB, and CR mounting accessories, offering the standard SAIJ set of Basic, FA, LB, TC, FTC, TCM1, and TCM2. Because the stroke is under 300 mm, side-load concerns are minimal, but always verify rod alignment. This configuration ships without a magnet, so position sensing is not available out of the box.
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 SAIJ125AX70-50 FAQ
At an operating pressure of 0.7 MPa, this 125 mm bore cylinder generates 8590 N of push force and 5734 N of pull force. It can deliver a maximum push force of 11045 N at 0.9 MPa.
The rear adjuster allows you to shorten the 70 mm nominal stroke by up to 50 mm, providing a usable travel window of 20 to 70 mm. This stopper only sets the travel end and does not lock or hold the load without live air pressure.
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Covers non-human-caused product damage.
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Standard models usually ship in 3-4 days.
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