Airtac SAIJ125 Adjustable Cylinder SAIJ125AX120-30
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125AX120-30 is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø125mm bore and 120mm 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
- Stroke120 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2
- CushionAdjustable, 40 mm
About the Airtac SAIJ125 Adjustable Cylinder SAIJ125AX120-30
The AirTAC SAIJ125X120-30 is a double-acting ISO 15552 profile cylinder featuring a rear stroke adjuster. It delivers 6136N of push force at 0.5MPa and provides a usable travel window of 90-120mm, letting you trim up to 30mm off the nominal stroke. This built-in adjuster allows fine end-position tuning at commissioning without swapping the cylinder or bolting on external stops.
This unit is configured with a SUS420J2 stainless steel piston rod (material code A) for improved corrosion resistance and PT tapered port threads. It operates at speeds of 30-500mm/s and includes sensor grooves on both sides of the extruded aluminum barrel. The rear screw acts as a travel stop to set deceleration, not a lock, so it will not hold a load without live air pressure.
Airtac SAIJ125 Adjustable Cylinder SAIJ125AX120-30 Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125AX120-30 |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø125 mm |
| Stroke | 120 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 SAIJ125AX120-30
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 125 | Bore size in mm. |
| ×120 | 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 SAIJ125AX120-30 Is Used
Variable End-Stop Forming
Dial in the exact 90-120mm travel window during press setup to accommodate different material thicknesses without changing the cylinder.
Machine Changeover
Quickly fine-tune the retract position by up to 30mm at the rear screw when switching a production line to a new product size.
Heavy-Duty Clamping
Leverage the 6136N push force at 0.5MPa to secure large workpieces, using the rear stop to precisely limit the clamp travel.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125AX120-30 the Right Cylinder?
Choose this 125mm bore when a 100mm bore (offering 3927N push at 0.5MPa) is insufficient, but a 160mm bore (10053N at 0.5MPa) would over-engineer the machine. The adjustable stroke is ideal for product-size changeovers on a line, dialing in the exact 90-120mm travel window during setup. For load-holding without live pressure, select the SAIL or BSAI series instead, as the SAIJ adjuster is only a stop.
To match this ISO 15552 cylinder for a retrofit, specify: 125mm bore, 120mm stroke, 30mm adjustment, PT ports, and the desired mounting from the SAIJ set (Basic, FA, LB, TC, FTC, TCM1, TCM2). Because the 120mm stroke is relatively short, side-load stress is minimal, but always ensure the M27x2 rod thread is properly aligned to avoid 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 SAIJ125AX120-30 FAQ
At a 0.5MPa operating pressure, this 125mm bore cylinder provides 6136N of push force and 5734N of pull force. At 0.7MPa, the push force increases to 8590N.
The rear adjuster screw lets you shorten the effective stroke by up to 30mm, creating a 90-120mm usable travel window. This allows precise end-position tuning during commissioning without adding external stops.
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