Airtac SAIJ125 Adjustable Cylinder SAIJ125X115-50
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125X115-50 is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø125mm bore and 115mm 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
- Stroke115 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2
- CushionAdjustable, 40 mm
About the Airtac SAIJ125 Adjustable Cylinder SAIJ125X115-50
The AirTAC SAIJ125X115-50 is a double-acting ISO 15552 profile cylinder featuring a rear stroke adjuster that permits up to 50 mm of travel reduction. This yields a usable working window of 65 to 115 mm, enabling precise end-position tuning at commissioning without swapping out the physical unit. It delivers a substantial 6136 N push force at 0.5 MPa, making it suitable for heavy-duty actuation.
The extruded aluminum barrel includes sensor grooves on both sides for direct mounting of CMSE reed and DMSE electronic switches, though this specific configuration omits the internal magnet. A carbon steel piston rod with an M27x2 thread provides high tensile strength, but long unsupported strokes still require an external guide to manage side loads. The rear adjuster functions strictly as a travel stop to decelerate the load, not as a lock; for position holding without live air pressure, consider the SAIL or BSAI series.
Airtac SAIJ125 Adjustable Cylinder SAIJ125X115-50 Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125X115-50 |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø125 mm |
| Stroke | 115 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 SAIJ125X115-50
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 125 | Bore size in mm. |
| ×115 | 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 SAIJ125X115-50 Is Used
Heavy-Duty Pressing
Dial in the exact 65-115 mm travel window during machine setup to apply consistent 6136 N pressing force without external stop blocks.
Product Changeover
Quickly adapt the cylinder's end position on automated lines when product sizes change, utilizing the 50 mm rear adjustment screw.
Fixture Alignment
Fine-tune the retract end-stop during commissioning to perfectly align heavy pneumatic clamps without machining new mounting plates.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125X115-50 the Right Cylinder?
Choose this 125 mm bore when 100 mm bore cylinders (providing 3927 N push at 0.5 MPa) lack the necessary thrust for high-force applications. The 50 mm adjustment range is ideal for product-size changeovers on a line, allowing operators to dial in the exact 65-115 mm travel window on the fly instead of installing fixed stops. When matching an ISO 15552 replacement, verify the 115 mm stroke, 50 mm adjuster, PT G1/2 port, and the reduced SAIJ mounting set (Basic, FA, LB, TC, FTC, TCM1, TCM2). Because the stroke is under 300 mm, side-load risks are moderate, but external guidance is still recommended for heavy lateral loads.
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 SAIJ125X115-50 FAQ
At 0.5 MPa operating pressure, this 125 mm bore cylinder generates 6136 N of push force and 5734 N of pull force. It can achieve up to 1251 kgf at 1.0 MPa.
The rear adjuster screw acts as a mechanical stop that shortens the nominal 115 mm stroke by up to 50 mm. This creates an adjustable travel window from 65 to 115 mm, allowing you to set the exact retract position without replacing the cylinder.
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