Airtac SAIJ125 Adjustable Cylinder SAIJ125AX185-50S
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125AX185-50S is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø125mm bore and 185mm 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
- Stroke185 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2
- CushionAdjustable, 40 mm
About the Airtac SAIJ125 Adjustable Cylinder SAIJ125AX185-50S
The AirTAC SAIJ125X185-50-S is a double-acting, single-rod ISO 15552 profile cylinder equipped with a rear stroke adjuster, delivering 6136N of push force at 0.5 MPa. It features a SUS420J2 stainless steel rod (option A) for enhanced corrosion resistance and includes a magnet (-S) for use with CMSE reed and DMSE electronic sensors. The PT tapered port threads ensure a robust, leak-free pneumatic connection.
With a nominal stroke of 185 mm and a 50 mm adjustment range, this SKU provides a usable travel window of 135 to 185 mm. This allows you to fine-tune the retract end-position at commissioning without swapping the cylinder or adding external stops. The extruded aluminum barrel retains standard ISO 15552 mounting dimensions and utilizes adjustable air cushions at both ends to decelerate heavy loads smoothly.
Airtac SAIJ125 Adjustable Cylinder SAIJ125AX185-50S Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125AX185-50S |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø125 mm |
| Stroke | 185 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 SAIJ125AX185-50S
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 125 | Bore size in mm. |
| ×185 | 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 SAIJ125AX185-50S Is Used
Product Size Changeovers
Dial in the exact 135 to 185 mm end-position during line changeovers to accommodate different product lengths without physically swapping out the actuator.
Heavy Forming End-Stops
Leverage the 6136N thrust capacity for pressing operations while using the 50 mm rear screw to precisely set the bottoming depth during machine commissioning.
Variable Position Ejection
Adjust the retract distance on the fly for ejection systems that must push parts of varying widths into downstream packaging or sorting chutes.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125AX185-50S the Right Cylinder?
Choose this 125 mm bore when an 80 mm cylinder (providing 2513N push at 0.5 MPa) lacks the thrust for moving substantial masses, but a 160 mm bore (10053N) would be physical overkill. The adjustable 135-185 mm window is ideal for machines processing multiple product sizes, allowing operators to dial in the exact end-stop during changeovers rather than machining custom spacers. Remember that the rear adjuster acts only as a travel stop, not a lock; the cylinder cannot hold a load without live air, so utilize a SAIL or BSAI cylinder if dead-load holding is required.
When replacing an ISO 15552 cylinder, verify the 125 mm bore, 185 mm stroke, 50 mm adjustment requirement, PT port threads, and the need for the -S magnet. Although the 185 mm stroke is under the 300 mm side-load threshold, the 32 mm rod and M27x2 rod thread provide a rigid interface, yet any application with heavy offset loads should still incorporate an external guide rail to prevent premature seal wear. The SAIJ mounting set includes Basic, FA, LB, TC, FTC, TCM1, and TCM2 options.
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 SAIJ125AX185-50S FAQ
At a 0.5 MPa operating pressure, this 125 mm bore cylinder generates 6136N of push force and 5734N of pull force. At the maximum 1.0 MPa pressure, it can deliver up to 1251 kgf.
The rear adjuster screw allows you to shorten the effective stroke from its 185 mm nominal length down to 135 mm, creating a 135-185 mm usable travel window. This mechanism acts as a physical stop to set the end position and relies on the air cushion for deceleration, but it is not a lock and will not hold the load without continuous air pressure.
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