Airtac SAIJ125 Adjustable Cylinder SAIJ125X155-20
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125X155-20 is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø125mm bore and 155mm 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
- Stroke155 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2
- CushionAdjustable, 40 mm
About the Airtac SAIJ125 Adjustable Cylinder SAIJ125X155-20
The AirTAC SAIJ125X155-20 is a double-acting ISO 15552 profile cylinder equipped with a rear stroke adjuster, delivering 6136N of push force at 0.5 MPa. It features a carbon steel piston rod and PT tapered port threads. By integrating an external adjustment screw, this actuator allows you to fine-tune the retract end position during commissioning without adding external stops.
With a 20mm adjustment range, the usable travel window spans 135 to 155mm. The extruded aluminum barrel includes sensor grooves on both sides for flexible switch placement. If position detection is required later, adding a magnet allows the use of AirTAC CMSE reed or DMSE electronic solid-state sensors.
Airtac SAIJ125 Adjustable Cylinder SAIJ125X155-20 Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125X155-20 |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø125 mm |
| Stroke | 155 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 SAIJ125X155-20
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 125 | Bore size in mm. |
| ×155 | 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 SAIJ125X155-20 Is Used
Product Changeovers
Dial in the 135-155mm travel window during format size changes on a packaging line, avoiding the need to swap out the entire actuator.
Machine Setup
Fine-tune the end-of-stroke position at commissioning to perfectly time heavy pressing or clamping operations using the rear stopper screw.
Heavy Forming
Leverage the 6136N push force at 0.5 MPa for robust metalforming or stamping tasks where exact bottoming depth is critical.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125X155-20 the Right Cylinder?
Choose this 125mm bore when an application requires substantial thrust, such as the 6136N push or 5734N pull force available at 0.5 MPa. If your setup needs less force, stepping down to a 100mm bore provides 3927N push force, while moving up to a 160mm bore yields 10053N. The adjustable stroke is ideal for product changeovers on a line, enabling variable end-stops without replacing the cylinder.
This model uses a subset of ISO 15552 mounts: Basic, FA, LB, TC, FTC, TCM1, and TCM2, omitting FB, CA, CB, and CR. Because the 155mm stroke is relatively short for this large bore, side-load concerns are minimal, but the load should still be guided externally. Note that the rear adjuster acts only as a travel stop and does not hold the load without live air; for true locking, consider 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 SAIJ125X155-20 FAQ
The rear adjuster screw allows you to shorten the effective travel by up to 20mm. This provides a usable stroke window of 135 to 155mm, letting you set the exact retract end position without external stops.
At 0.5 MPa operating pressure, it provides 6136N of push force and 5734N of pull force. The maximum thrust is 1251 kgf at 1.0 MPa.
Authorized Export Seller
Genuine AirTAC parts produced by AirTAC factory.
1-Year Warranty
Covers non-human-caused product damage.
Fast Dispatch
Standard models usually ship in 3-4 days.
Fast Reply
Most inquiries answered within 7-8 hours.
Related AirTAC SAI Cylinders
Request a Quote for Airtac SAIJ125 Adjustable Cylinder SAIJ125X155-20
Send us the quantity and destination. We confirm price, stock and lead time — usually within 7-8 hours.