Airtac SAIJ125 Adjustable Cylinder SAIJ125X325-20S
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125X325-20S is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø125mm bore and 325mm 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
- Stroke325 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2
- CushionAdjustable, 40 mm
About the Airtac SAIJ125 Adjustable Cylinder SAIJ125X325-20S
The AirTAC SAIJ125X325-20-S is a double-acting, single-rod ISO 15552 profile cylinder equipped with a rear stroke adjuster. It features a carbon steel rod and a PT tapered port. Because this SKU includes the -S magnet option, it directly supports AirTAC CMSE reed and DMSE electronic sensors housed within the dual-side extruded barrel grooves. Operating at a 30-500 mm/s speed range, it delivers a robust 6136 N pull force at 0.5 MPa.
The -20 adjustment code allows you to dial back the 325 mm nominal stroke by up to 20 mm, creating a precise 305-325 mm usable travel window. This built-in stopper lets you fine-tune the retract end-position at commissioning without swapping the cylinder or adding external stops. The rear adjuster acts purely as a travel stop and deceleration aid alongside the 40 mm air cushions; it does not hold the load without live air.
Airtac SAIJ125 Adjustable Cylinder SAIJ125X325-20S Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125X325-20S |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø125 mm |
| Stroke | 325 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 SAIJ125X325-20S
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 125 | Bore size in mm. |
| ×325 | 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 SAIJ125X325-20S Is Used
Machine Changeover
Quickly fine-tune the 305-325 mm end-stop during product size changeovers without disassembling the line or swapping cylinders.
Variable End Stops
Dial in the exact retract position on a conveyor sorting arm to handle different package lengths on the fly.
Assembly Press Setup
Precisely set the engagement depth of a 6136 N assembly tool at commissioning to prevent damage to new workpieces.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125X325-20S the Right Cylinder?
Choose this 125 mm bore when your application requires higher force than the 100 mm bore (which provides 3681 N pull at 0.5 MPa), but you want to avoid stepping up to the heavier 160 mm class. The adjustable 305-325 mm window is ideal for production lines running multiple product sizes, allowing rapid changeover by simply turning the rear screw rather than physically replacing a fixed-stroke SAI cylinder. For load-holding without continuous air pressure, this cylinder is insufficient; you should select an SAIL (air-released lock) or BSAI (clamp-lock) cylinder instead.
When replacing an ISO 15552 cylinder, match these exact attributes: 125 mm bore, 325 mm stroke, 20 mm adjustment, PT port thread, and the -S magnet. Because the 325 mm stroke is relatively long, the 32 mm rod diameter provides excellent rigidity, but an external guide is still recommended to prevent excessive side-loading on the unsupported rod. SAIJ supports Basic, FA, LB, TC, FTC, TCM1, and TCM2 mounts.
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 SAIJ125X325-20S FAQ
At 0.5 MPa operating pressure, this 125 mm bore cylinder provides 6136 N of push force and 5734 N of pull force. At the maximum 1.0 MPa pressure, it delivers 1251 kgf.
The rear adjuster screw allows you to shorten the 325 mm nominal stroke by up to 20 mm, providing a usable travel window of 305 to 325 mm. This stopper only sets the end position and does not lock the load without live air pressure.
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