Airtac SAIJ125 Adjustable Cylinder SAIJ125AX170-30S
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125AX170-30S 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 SAIJ125AX170-30S
The AirTAC SAIJ125X170-30-S is a double-acting ISO 15552 profile cylinder equipped with a rear stroke adjuster, delivering a robust 6136N push force at 0.5 MPa. It features a 125mm bore and a 170mm nominal stroke, which the rear stopper can trim back by up to 30mm, creating a precise 140-170mm usable travel window for exact end-position tuning. This built-in adjustability allows you to dial in the retract distance during commissioning without adding external stops or swapping the cylinder.
Engineered for durability, the piston rod is made from SUS420J2 stainless steel (material code A), and the -S suffix indicates an integrated magnet for position sensing via AirTAC CMSE reed or DMSE electronic switches. The extruded aluminum barrel includes sensor grooves on both sides, and the standard PT G1/2 port provides ample flow for the 30-500mm/s operating speed range.
Airtac SAIJ125 Adjustable Cylinder SAIJ125AX170-30S Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125AX170-30S |
|---|---|
| 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 SAIJ125AX170-30S
| 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 SAIJ125AX170-30S Is Used
Machine Setup & Changeover
Fine-tune the 140-170mm retract distance during product family changeovers without physically swapping cylinders or re-machining external hard stops.
Variable End-Stop Positioning
Dial in the exact end-of-stroke position for diverter arms or gating mechanisms on the fly using the 30mm rear adjustment screw.
Heavy-Duty Forming Stops
Leverage the 6136N push force at 0.5 MPa to act as an adjustable backstop for heavy workpieces in pressing or clamping stations.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125AX170-30S the Right Cylinder?
Select this 125mm bore cylinder when an application requires substantial force, such as 6136N push at 0.5 MPa, alongside variable end-stop positioning. If your setup demands less thrust, stepping down to a 100mm bore yields 3927N push force, whereas moving up to a 160mm bore provides 10053N. The adjustable stroke is specifically beneficial for product changeovers on a line, letting you fine-tune the 140-170mm travel window on the fly instead of machining new hard stops. Because the 170mm stroke is under 300mm, side-load risks are moderate, but the robust 32mm SUS420J2 rod still requires adequate external guiding for heavy lateral loads.
When specifying a replacement, ensure you match the 125mm bore, 170mm stroke, 30mm adjustment range, PT G1/2 port, and the -S magnet requirement. Mounting is limited to the SAIJ subset: Basic, FA, LB, TC, FTC, TCM1, and TCM2 (omitting FB, CA, CB, and CR). Remember that the rear adjuster functions purely as a travel stop, not a lock; the cylinder cannot hold a load without live air, so for fail-safe load holding, consider an AirTAC SAIL or BSAI cylinder instead.
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 SAIJ125AX170-30S 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 acts as a mechanical stop that allows you to shorten the 170mm nominal stroke by up to 30mm, providing a usable travel window of 140-170mm. It only sets the travel end and does not lock the load without continuous air pressure.
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