Airtac SAIJ125 Adjustable Cylinder SAIJ125X155-30S
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125X155-30S is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø125mm bore and 155mm 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
- Stroke155 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2
- CushionAdjustable, 40 mm
About the Airtac SAIJ125 Adjustable Cylinder SAIJ125X155-30S
The AirTAC SAIJ125X155-30-S is a double-acting ISO 15552 profile cylinder featuring a rear stroke adjuster. It delivers 6136N of push force at 0.5 MPa and provides a usable travel window of 125 to 155 mm, letting you dial back the nominal 155 mm stroke by up to 30 mm. This built-in adjustability simplifies machine setup and product changeovers without requiring external stops or cylinder swaps.
Equipped with a standard magnet (-S), it integrates seamlessly with AirTAC CMSE reed and DMSE electronic sensors housed in the extruded aluminum barrel's dual-side grooves. The 32 mm carbon steel rod and M27x2 thread provide robust resistance to side loads, while the PT tapered ports ensure a tight pneumatic connection. The rear adjuster acts purely as a travel stop and does not hold the load without live air pressure.
Airtac SAIJ125 Adjustable Cylinder SAIJ125X155-30S Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125X155-30S |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø125 mm |
| Stroke | 155 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 SAIJ125X155-30S
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 125 | Bore size in mm. |
| ×155 | 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 SAIJ125X155-30S Is Used
Variable End-Stop Tuning
Fine-tune the retract stroke by up to 30 mm during machine commissioning to perfectly set the end position for new tooling without swapping cylinders.
Product Size Changeover
Quickly adjust the 125-155 mm travel window on packaging lines to accommodate different carton or product heights on the fly.
Heavy-Duty Positioning
Leverage the 6136N push force at 0.5 MPa to move heavy pallets or fixtures, relying on the external stopper to set the exact resting position.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125X155-30S the Right Cylinder?
Select this 125 mm bore cylinder when your application requires substantial thrust—stepping down to an 80 mm bore drops the 0.5 MPa push force to 2513N, while upgrading to a 160 mm bore yields 10053N. Choose the SAIJ adjustable-stroke variant over a fixed SAI model when you need precise end-position tuning during commissioning or when accommodating multiple product sizes on the same line. For load-holding without continuous air pressure, pair this cylinder with a SAIL air-released lock, a BSAI clamp-lock, or an external rod lock, as the rear adjuster is a stop, not a brake.
This SAIJ125X155-30-S configuration includes a PT tapered port, a standard magnet for CMSE/DMSE sensors, and a carbon steel rod. It supports the SAIJ mounting subset (Basic, FA, LB, TC, FTC, TCM1, TCM2) and is dimensionally interchangeable per ISO 15552. Because the 155 mm stroke is relatively short, external guide rails are less critical than for long-stroke setups, but the 32 mm rod still handles side loads effectively.
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 SAIJ125X155-30S FAQ
The rear adjuster acts as an external stopper that lets you shorten the effective stroke by up to 30 mm. This creates a usable travel window of 125 to 155 mm, allowing you to fine-tune the retract end position at commissioning without adding external stops or changing the cylinder.
At 0.5 MPa, this 125 mm bore cylinder provides 6136N of push force and 5734N of pull force. It can deliver up to 11045N of push force at 0.7 MPa.
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