Airtac SAIJ125 Adjustable Cylinder SAIJ125AX700-20S
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125AX700-20S is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø125mm bore and 700mm 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
- Stroke700 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2
- CushionAdjustable, 40 mm
About the Airtac SAIJ125 Adjustable Cylinder SAIJ125AX700-20S
The AirTAC SAIJ125X700-20-S is a double-acting ISO 15552 profile cylinder featuring a rear stroke adjuster that allows you to fine-tune the effective travel down to 680 mm from a 700 mm nominal stroke. This 20 mm adjustment window is ideal for dialing in exact end positions during machine commissioning or product changeovers without adding external stops. It delivers a robust 6136 N push force at 0.5 MPa and 8590 N at 0.7 MPa.
This SKU includes a SUS420J2 stainless steel rod (option A) for enhanced corrosion resistance and is equipped with a magnet (-S) for use with AirTAC CMSE reed and DMSE solid-state sensors. It uses PT tapered G1/2 ports and relies on a 40 mm air cushion at both ends to decelerate heavy loads. The rear adjuster acts purely as a mechanical stop to set the travel end and does not hold the load without live air pressure.
Airtac SAIJ125 Adjustable Cylinder SAIJ125AX700-20S Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125AX700-20S |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø125 mm |
| Stroke | 700 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 SAIJ125AX700-20S
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 125 | Bore size in mm. |
| ×700 | 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 SAIJ125AX700-20S Is Used
Product Changeover Dials
Quickly adjust the 680-700 mm travel window to accommodate different package lengths on a packaging line without swapping out the entire cylinder assembly.
Commissioning End-Tuning
Fine-tune the retract end-position by up to 20 mm during machine setup to perfect the seating force of a 6136 N press operation at 0.5 MPa.
Heavy Material Handling
Moves substantial bulk materials using the 8590 N thrust at 0.7 MPa, relying on the 40 mm air cushions to safely decelerate the 700 mm stroke.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125AX700-20S the Right Cylinder?
Choose this 125 mm bore when a 100 mm bore (offering 3927 N at 0.5 MPa) cannot provide enough thrust, but a 160 mm bore (10053 N at 0.5 MPa) would be physically oversized. The adjustable stroke is selected over a fixed SAI cylinder when a process requires variable end-stops for different product sizes on a single line. Because the nominal stroke is 700 mm, the 32 mm diameter rod and M27x2 thread provide substantial rigidity, but an external guide is strongly recommended to prevent excessive side-loading on the long unsupported rod.
To match this exact configuration for an ISO 15552 interchangeable replacement, ensure you specify the 125 mm bore, 700 mm stroke, 20 mm adjustment range, PT G1/2 ports, SUS420J2 rod material, and the -S magnet option. The available mounting set for SAIJ includes Basic, FA, LB, TC, FTC, TCM1, and TCM2. If your application requires true load-holding without continuous air pressure, the rear adjuster will not act as a brake; consider the SAIL pneumatic lock or BSAI clamp-lock cylinder instead.
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 SAIJ125AX700-20S 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 mechanical stopper allows you to shorten the 700 mm nominal stroke by up to 20 mm, creating a 680-700 mm usable travel window. It functions as a travel stop and does not lock or hold the load without live air pressure.
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