Airtac SAIJ125 Adjustable Cylinder SAIJ125X40-20S
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125X40-20S is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø125mm bore and 40mm 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
- Stroke40 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2
- CushionAdjustable, 40 mm
About the Airtac SAIJ125 Adjustable Cylinder SAIJ125X40-20S
The AirTAC SAIJ125X40-20-S is a double-acting, single-rod ISO 15552 profile cylinder equipped with a rear stroke adjuster. It provides a robust 6136N push force at 0.5 MPa and features a usable travel window of 20 to 40mm, letting you dial in the exact end position during commissioning. The extruded aluminum barrel includes sensor grooves on both sides, and because this SKU includes the -S magnet, it directly supports AirTAC CMSE reed and DMSE electronic solid-state switches for precise position detection.
This 125mm bore unit uses a PT tapered port thread and a 32mm carbon steel rod with an M27x2 thread. The rear adjustment screw acts purely as a mechanical stop to fine-tune the retract distance; it does not lock or hold the load without continuous air pressure. For load-holding requirements without live air, consider an external pilot-operated check valve or the related SAIL lock cylinder series.
Airtac SAIJ125 Adjustable Cylinder SAIJ125X40-20S Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125X40-20S |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø125 mm |
| Stroke | 40 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 SAIJ125X40-20S
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 125 | Bore size in mm. |
| ×40 | 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 SAIJ125X40-20S Is Used
High-Force Clamping
Delivers 6136N of push force for securing heavy workpieces, with a 20-40mm travel window to accommodate varying material thicknesses during machining.
Product Changeover
Quickly fine-tune the retract end position by up to 20mm during production line size changes without replacing the entire cylinder assembly.
Assembly Pressing
Provides adjustable end-stops for pressing bearings or pins, allowing operators to set precise insertion depths directly at the machine.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125X40-20S the Right Cylinder?
Choose this adjustable-stroke model when your machine setup requires variable end-stops or frequent product-size changeovers, avoiding the need to physically swap cylinders or bolt on external stopper blocks. If your application requires less thrust, stepping down to an 80mm bore yields 2513N at 0.5 MPa, but the 125mm bore is necessary for high-force clamping. The SAIJ mounting set includes Basic, FA, LB, TC, FTC, TCM1, and TCM2 options, omitting FB, CA, CB, and CR. To match this cylinder for an ISO 15552 replacement, verify the 125mm bore, 40mm stroke, 20mm adjustment, PT ports, and the -S magnet.
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 SAIJ125X40-20S FAQ
At 0.5 MPa operating pressure, this 125mm bore cylinder provides 6136N of push force and 5734N of pull force. It can reach a maximum push force of 11045N at 0.7 MPa.
The rear adjuster screw allows you to trim the effective travel back by up to 20mm, creating a usable stroke window of 20 to 40mm. This mechanical stop fine-tunes the end position but does not hold the load without live air pressure.
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Standard models usually ship in 3-4 days.
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