Airtac SAIJ125 Adjustable Cylinder SAIJ125AX300-10S
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125AX300-10S is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø125mm bore and 300mm 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
- Stroke300 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2
- CushionAdjustable, 40 mm
About the Airtac SAIJ125 Adjustable Cylinder SAIJ125AX300-10S
The AirTAC SAIJ125X300-10-S is a double-acting ISO 15552 profile cylinder equipped with a rear stroke adjuster, allowing you to fine-tune the retract end position by up to 10 mm. This yields a precise 290-300 mm usable travel window, ideal for dialing in final positioning during machine commissioning without adding bulky external stops. It delivers a robust 6136 N pull force at 0.5 MPa, leveraging a 32 mm SUS420J2 stainless steel rod and M27x2 thread to handle substantial side loads.
This variant includes a piston magnet (-S) for direct integration with AirTAC CMSE reed and DMSE electronic solid-state sensors, which seat neatly into the dual-side extruded aluminum barrel grooves. Fluid supply is routed through PT tapered G1/2 ports, and the standard adjustable air cushions at both ends absorb kinetic energy. The rear adjustment screw acts purely as a travel stop to set deceleration limits and does not lock or hold the load without continuous air pressure.
Airtac SAIJ125 Adjustable Cylinder SAIJ125AX300-10S Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125AX300-10S |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø125 mm |
| Stroke | 300 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 SAIJ125AX300-10S
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 125 | Bore size in mm. |
| ×300 | 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 SAIJ125AX300-10S Is Used
Product Changeover Tuning
Dial in the 10 mm retract window during rapid product size transitions on packaging lines without physically swapping the cylinder.
Precision End-Stopping
Use the rear stopper to set exact 290-300 mm travel limits for heavy machining fixtures requiring strict final positioning.
Heavy Assembly Pressing
Leverage the 6136 N pull force to seat large components, adjusting the stroke end to accommodate varying part tolerances.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125AX300-10S the Right Cylinder?
Choose this 125 mm bore when an application demands high thrust (6136 N pull at 0.5 MPa) alongside strict end-position tuning. If your process requires less force, stepping down to the 100 mm bore yields 3681 N pull, whereas moving up to the 160 mm bore provides 9425 N pull. The 10 mm adjustable window is perfect for product size changeovers on a line, providing flexibility that a fixed-stroke SAI cylinder cannot match. For load-holding without live air, select a SAIL or BSAI cylinder instead, as this adjuster is not a brake.
When replacing an ISO 15552 cylinder, match the 125 mm bore, 300 mm stroke, 10 mm adjustment, G1/2 PT ports, and the -S magnet. Because the 300 mm stroke is substantial, the unsupported rod length requires an external guide to prevent side-load wear, despite the robust 32 mm rod. SAIJ supports a reduced mounting set including Basic, FA, LB, TC, FTC, TCM1, and TCM2, omitting FB, CA, CB, and CR.
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 SAIJ125AX300-10S FAQ
At an operating pressure of 0.5 MPa, this 125 mm bore cylinder generates 6136 N of pull force and 8590 N of push force. It can reach a maximum push force of 11045 N at 0.7 MPa.
The rear adjuster screw allows you to shorten the nominal 300 mm stroke by up to 10 mm, creating a 290-300 mm usable travel window. This stopper only sets the end position and deceleration; it does not lock the load without continuous air pressure.
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