Airtac SAIJ125 Adjustable Cylinder SAIJ125X155-20S
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125X155-20S 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 SAIJ125X155-20S
The AirTAC SAIJ125X155-20-S is a double-acting, single-rod ISO 15552 profile cylinder featuring a rear stroke adjuster. It delivers 6136N of push force and 5734N of pull force at 0.5 MPa. The built-in rear stopper allows you to fine-tune the effective travel down from the 155mm nominal stroke, creating a precise 135-155mm usable window without adding external stops. This cylinder includes a magnet for position sensing and uses a PT tapered port thread.
Equipped with a 32mm carbon steel rod and M27x2 rod threading, this 125mm bore unit handles substantial loads. The extruded aluminum barrel features sensor grooves on both sides, supporting CMSE reed and DMSE electronic switches. The rear adjuster acts purely as a travel stop for end-position tuning; it does not lock the load. For load-holding without live air, consider the SAIL or BSAI series. The SAIJ mounting set includes Basic, FA, LB, TC, FTC, TCM1, and TCM2 options.
Airtac SAIJ125 Adjustable Cylinder SAIJ125X155-20S Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125X155-20S |
|---|---|
| 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 SAIJ125X155-20S
| 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 SAIJ125X155-20S Is Used
Variable End Stops
Dial in the exact 135-155mm travel distance during machine commissioning to accommodate varying part sizes without swapping cylinders.
Product Changeover
Quickly adjust the retract end-position on automated lines when switching between different product lengths or formats.
Machine Setup
Fine-tune the stroke limit at commissioning using the rear stopper, preventing the need for external mechanical stops.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125X155-20S the Right Cylinder?
Select this 125mm bore model when your application requires high force (6136N at 0.5 MPa) alongside variable end-position tuning. The 20mm adjustment range is ideal for product changeovers on a line, letting you dial in the exact 135-155mm travel distance at commissioning. If you need less force, the 100mm bore offers 3927N push at 0.5 MPa; if you need more, the 160mm bore provides 10053N push. Since the stroke is 155mm, side-load risks are moderate, but always ensure proper guiding for the load. To match this ISO 15552 footprint, specify: 125mm bore, 155mm stroke, 20mm adjustment, PT G1/2 port, 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 SAIJ125X155-20S FAQ
At an operating pressure of 0.5 MPa, this 125mm bore cylinder provides a push (extend) force of 6136N and a pull (retract) force of 5734N. At 0.9 MPa, the push force increases to 11045N.
The rear adjuster screw allows you to shorten the nominal 155mm stroke by up to 20mm, providing an effective travel window of 135-155mm. This stopper only sets the end position and deceleration; it does not hold the load without live air pressure.
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