Airtac SAIJ125 Adjustable Cylinder SAIJ125X260-40S
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125X260-40S is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø125mm bore and 260mm 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
- Stroke260 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2
- CushionAdjustable, 40 mm
About the Airtac SAIJ125 Adjustable Cylinder SAIJ125X260-40S
The AirTAC SAIJ125X260-40-S is a double-acting ISO 15552 profile cylinder featuring a rear-mounted stroke adjuster. It provides a usable travel window of 220 to 260 mm, allowing you to dial back the nominal 260 mm stroke by up to 40 mm during commissioning. This bore delivers 6136 N of push force at 0.5 MPa and integrates a standard carbon steel rod with PT tapered port threads.
The adjuster functions strictly as a travel stop for end-position tuning, not a load-holding lock. For position retention without live air pressure, consider the SAIL or BSAI series. This -S variant includes a magnet for CMSE reed and DMSE electronic sensors, fitting neatly into the dual-side sensor grooves of the extruded aluminum barrel.
Airtac SAIJ125 Adjustable Cylinder SAIJ125X260-40S Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125X260-40S |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø125 mm |
| Stroke | 260 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 SAIJ125X260-40S
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 125 | Bore size in mm. |
| ×260 | 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 SAIJ125X260-40S Is Used
Machine Setup Tuning
Fine-tune the 220 to 260 mm travel window during initial commissioning to perfect end-position stops without adding external spacers.
Product Changeover
Quickly adjust the rear stopper by up to 40 mm to accommodate varying product sizes on the same production line.
Heavy Fixture Positioning
Leverage the 6136 N push force at 0.5 MPa to move heavy jigs while precisely defining the retracted end position.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125X260-40S the Right Cylinder?
Select this 125 mm bore when an 80 mm bore (2513 N push at 0.5 MPa) lacks sufficient thrust for heavier fixtures. The 40 mm adjustment window is ideal for product changeovers where exact end-of-stroke positioning varies without swapping the entire cylinder. It supports a speed range of 30-500 mm/s.
For ISO 15552 interchangeability, match the 125 mm bore, 260 mm stroke, 40 mm adjuster, PT port threads, and the -S magnet. The SAIJ mounting set includes Basic, FA, LB, TC, FTC, TCM1, and TCM2, omitting FB, CA, CB, and CR. Since the 260 mm stroke is under 300 mm, standard mounting handles the load without requiring an external side-load guide.
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 SAIJ125X260-40S FAQ
At 0.5 MPa operating pressure, this 125 mm bore cylinder provides 6136 N of push force and 5734 N of pull force. At 0.9 MPa, the push force increases to 11045 N.
The rear adjuster acts as a stopper that lets you shorten the effective travel from 260 mm down to 220 mm. It only sets the end position and does not hold the load without live air pressure.
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