Airtac SAIJ125 Adjustable Cylinder SAIJ125AX115-40S
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125AX115-40S 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 SAIJ125AX115-40S
The AirTAC SAIJ125X115-40-S is a double-acting ISO 15552 profile cylinder equipped with a rear stroke adjuster. It features a 125 mm bore and a 115 mm nominal stroke that can be fine-tuned backward by up to 40 mm, yielding a usable travel window of 75-115 mm. This wide adjustment range allows precise end-position calibration during commissioning without swapping the cylinder or adding external stops. The SUS420J2 stainless steel rod (option A) provides excellent corrosion resistance for harsh environments.
Operating at 0.5 MPa, it generates 6136 N of push force and 5734 N of pull force. It includes a magnet for position sensing, compatible with AirTAC CMSE reed switches and DMSE electronic solid-state sensors that mount directly into the dual-side sensor grooves on the extruded aluminum barrel. The rear adjuster acts purely as a travel stop to set deceleration and end limits; it does not hold the load without live air. For position holding without pneumatic pressure, consider the SAIL or BSAI series.
Airtac SAIJ125 Adjustable Cylinder SAIJ125AX115-40S Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125AX115-40S |
|---|---|
| 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 SAIJ125AX115-40S
| 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 SAIJ125AX115-40S Is Used
Variable End-Stop Tuning
Dial in the exact 75-115 mm travel distance during machine commissioning to accommodate varying material thicknesses without external physical stops.
Product Changeover Setup
Quickly adjust the retract end-position on packaging lines when switching between different product sizes, reducing downtime and mechanical retooling.
High-Force Positioning
Leverage the 6136 N push force at 0.5 MPa to move heavy jigs into exact final positions, using the 40 mm adjustment to fine-tune the resting point.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125AX115-40S the Right Cylinder?
Choose this 125 mm bore when an 80 mm cylinder lacks thrust, stepping up from the 80 mm bore's 2513 N push force at 0.5 MPa to a robust 6136 N. The adjustable 75-115 mm travel window is ideal for machines requiring variable end-stops during product changeovers, replacing the need for fixed-stroke SAI cylinders when exact positioning varies. The PT tapered port threads ensure a tight, reliable pneumatic seal.
When matching this ISO 15552 cylinder for a replacement, verify the 125 mm bore, 115 mm stroke, 40 mm adjustment range, PT port threads, and the -S magnet option. Because the stroke is under 300 mm, side-load stress on the M27x2 rod thread is manageable, though external guides are still recommended for heavy lateral loads. The SAIJ mounting set includes Basic, FA, LB, TC, FTC, TCM1, and TCM2 options, 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 SAIJ125AX115-40S FAQ
At 0.5 MPa operating pressure, this 125 mm bore cylinder provides 6136 N of push force and 5734 N of pull force. It can reach a maximum push force of 11045 N at 0.9 MPa.
The rear adjusting screw lets you shorten the effective stroke by up to 40 mm. With the 115 mm nominal stroke, this creates a usable travel window of 75-115 mm, allowing you to fine-tune the retract end-position without altering the cylinder's physical mounting.
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