Airtac SAIJ125 Adjustable Cylinder SAIJ125AX120-50
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125AX120-50 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 SAIJ125AX120-50
The AirTAC SAIJ125X120-50 is a double-acting ISO 15552 profile cylinder featuring a rear-mounted stroke adjuster. It delivers 6136 N of push force and 5734 N of pull force at 0.5 MPa, providing robust actuation for heavy industrial tasks. The barrel is extruded aluminum with sensor grooves on both sides, strictly avoiding any tie-rod construction.
Equipped with a 50 mm adjustment range, this model allows you to trim the effective travel down from a 120 mm nominal stroke to a 70 mm minimum. This creates a 70-120 mm usable window, enabling precise end-position tuning during commissioning without swapping the cylinder. The piston rod is constructed from SUS420J2 stainless steel, and the pneumatic ports feature PT tapered threads.
Airtac SAIJ125 Adjustable Cylinder SAIJ125AX120-50 Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125AX120-50 |
|---|---|
| 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 SAIJ125AX120-50
| 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 SAIJ125AX120-50 Is Used
Product Size Changeovers
Dial in the 70-120 mm travel window during format changeovers on packaging lines, using the rear screw to establish new end-stops without disassembling the actuator.
Heavy Press Positioning
Leverage the 6136 N push force at 0.5 MPa to seat heavy components, relying on the adjuster to fine-tune the final pressing depth during machine commissioning.
Variable End-Stop Actuation
Adapt automated assembly stations on the fly by trimming the stroke back up to 50 mm, accommodating different part heights without adding bulky external mechanical stops.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125AX120-50 the Right Cylinder?
Select this 125 mm bore when an 80 mm cylinder (providing 2513 N push at 0.5 MPa) lacks the necessary thrust, but a 160 mm bore is physically oversized. The 50 mm adjustment code is ideal for machines processing varying product sizes, allowing operators to dial in the exact stroke end-point on the fly rather than machining external stops. The rear adjuster acts purely as a travel stop to set deceleration alongside the air cushions; it is not a locking mechanism. If your application requires the load to be held securely without live air pressure, integrate an external pilot-operated check valve or select an AirTAC SAIL or BSAI locking cylinder.
To match this ISO 15552 interchangeable cylinder exactly, confirm the 120 mm nominal stroke, 50 mm adjustment limit, PT port threads, SUS420J2 rod material, and the absence of a magnet. The approved mounting set includes Basic, FA, LB, TC, FTC, TCM1, and TCM2 options.
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 SAIJ125AX120-50 FAQ
At 0.5 MPa operating pressure, this 125 mm bore cylinder provides 6136 N of push force and 5734 N of pull force. If pressure is increased to 0.7 MPa, the push force rises to 8590 N.
The rear adjuster acts as a mechanical stop that shortens the 120 mm nominal stroke. You can trim the travel back by up to 50 mm, creating a usable 70-120 mm window to fine-tune the end position without replacing the cylinder.
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