Airtac SAIJ125 Adjustable Cylinder SAIJ125X300-50S
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125X300-50S 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 SAIJ125X300-50S
The AirTAC SAIJ125X300-50-S is a double-acting ISO 15552 profile cylinder equipped with a rear stroke adjuster, providing a usable travel window of 250-300 mm from its 300 mm nominal stroke. Built with a carbon steel rod and PT G1/2 tapered ports, it delivers robust thrust capabilities, pushing with 8590 N and pulling with 5734 N at 0.7 MPa. This bore size also features a 40 mm variable air cushion at both ends to manage kinetic energy during operation.
Because this is an adjustable-stroke variant rather than a fixed-stroke SAI, the external rear stopper allows you to fine-tune the retract end-position during commissioning without adding external stops. It includes a standard magnet (-S) for position sensing, operating seamlessly with AirTAC CMSE reed switches and DMSE solid-state electronic sensors mounted in the dual-side extruded barrel grooves. The mounting interface supports Basic, FA, LB, TC, FTC, TCM1, and TCM2 attachments.
Airtac SAIJ125 Adjustable Cylinder SAIJ125X300-50S Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125X300-50S |
|---|---|
| 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 SAIJ125X300-50S
| 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 SAIJ125X300-50S Is Used
Product Changeovers
Dial in the 250-300 mm travel window during product size transitions without physically replacing the cylinder or adding external mechanical stops.
Machine Setup Tuning
Fine-tune the exact retract end-position at commissioning to perfect pressing or clamping forces, avoiding the guesswork of fixed-stroke setups.
Variable End Stops
Establish precise, repeatable retract limits for heavy-duty assembly stations requiring up to 8590 N of thrust at 0.7 MPa.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125X300-50S the Right Cylinder?
Choose this 125 mm bore when a 100 mm bore (offering 5497 N push at 0.7 MPa) lacks sufficient force, but a 160 mm bore (14074 N push) is oversized for your space. The 50 mm adjustment range is ideal for product-size changeovers on a line, letting you dial in the exact end-stop without physically swapping the cylinder.
When specifying an ISO 15552 replacement, match the 125 mm bore, 300 mm stroke, 50 mm adjustment, PT G1/2 port, and the -S magnet. Since the stroke is 300 mm, use an external guide to prevent excessive side-loading on the rod. Note that the rear adjuster acts only as a travel stop and does not hold the load without live air; for true load-holding, select the SAIL or BSAI series.
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 SAIJ125X300-50S FAQ
The rear adjuster lets you shorten the effective stroke by up to 50 mm, creating a usable travel window of 250-300 mm. This allows precise end-position tuning at commissioning without swapping the cylinder.
At 0.7 MPa, it provides 8590 N of push force and 5734 N of pull force. At 0.9 MPa, the push force increases to 11045 N.
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