Airtac SAIJ125 Adjustable Cylinder SAIJ125X170-20
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125X170-20 is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø125mm bore and 170mm 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
- Stroke170 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2
- CushionAdjustable, 40 mm
About the Airtac SAIJ125 Adjustable Cylinder SAIJ125X170-20
The AirTAC SAIJ125X170-20 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 32mm carbon steel rod with an M27x2 thread and a G1/2 port. By turning the rear screw, you can trim the effective travel into a precise 150-170mm window, which is ideal for dialing in exact end positions during commissioning.
This adjustable stopper allows you to fine-tune the retract position without swapping out the cylinder or adding external stops. The extruded aluminum barrel includes sensor grooves on both sides, and while this unit omits a magnet, adding an -S magnet enables tracking with AirTAC CMSE (reed) or DMSE (electronic) switches. The rear adjuster acts purely as a travel stop and does not hold the load without live air pressure.
Airtac SAIJ125 Adjustable Cylinder SAIJ125X170-20 Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125X170-20 |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø125 mm |
| Stroke | 170 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 SAIJ125X170-20
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 125 | Bore size in mm. |
| ×170 | 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 SAIJ125X170-20 Is Used
Product Size Changeover
Quickly dial in the 150-170mm travel window during format changes on packaging lines without physically swapping cylinders.
Machine Setup Tuning
Fine-tune the exact retract end position at commissioning to perfect tooling alignment without machining custom spacers.
Heavy Material Handling
Leverage the 6136N push force at 0.5 MPa to move heavy workpieces while maintaining precise positioning limits.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125X170-20 the Right Cylinder?
Choose this 125mm bore when a 100mm cylinder (providing 3927N push at 0.5 MPa) lacks the necessary thrust, but a 160mm bore is physically too large. The 150-170mm adjustable travel window is highly beneficial for product-size changeovers on a line, whereas a fixed-stroke SAI cylinder would require mechanical shims. For load-holding without continuous air pressure, you must integrate an external rod lock or look at the SAIL or BSAI series, as the SAIJ adjuster is strictly a stop.
When replacing an ISO 15552 cylinder, match the 125mm bore, 170mm nominal stroke, G1/2 port (PT tapered thread), and the reduced SAIJ mounting set (Basic, FA, LB, TC, FTC, TCM1, TCM2—omitting FB, CA, CB, CR). With a 170mm stroke, the 32mm rod handles side loads well, but any long unsupported tooling should still use an external guide to prevent binding.
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 SAIJ125X170-20 FAQ
At 0.5 MPa operating pressure, this 125mm bore cylinder provides 6136N of push force and 5734N of pull force. At 0.7 MPa, the push force increases to 8590N.
The rear adjuster screw allows you to shorten the 170mm nominal stroke by up to 20mm, creating a usable travel window of 150-170mm. This stopper sets the end position but does not lock the load without live air pressure.
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