Airtac SAIJ125 Adjustable Cylinder SAIJ125X350-30
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125X350-30 is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø125mm bore and 350mm 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
- Stroke350 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2
- CushionAdjustable, 40 mm
About the Airtac SAIJ125 Adjustable Cylinder SAIJ125X350-30
The AirTAC SAIJ125X350-30 is a double-acting ISO 15552 profile cylinder featuring a rear-mounted stroke adjuster. It provides a usable travel window of 320 to 350 mm, allowing you to dial back the nominal 350 mm stroke by up to 30 mm during machine setup. Belonging to the 125 mm bore class, it delivers a substantial push force of 6136 N at 0.5 MPa and reaches a maximum of 1251 kgf at 1.0 MPa.
This extruded aluminum profile barrel includes sensor grooves on both sides for flexible switch mounting. The standard carbon steel rod uses an M27x2 thread, and the PT G1/2 porting pairs with 40 mm variable air cushions at both ends to manage kinetic energy. The rear adjuster acts purely as a travel stop for fine-tuning end positions, not as a load-holding lock.
Airtac SAIJ125 Adjustable Cylinder SAIJ125X350-30 Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125X350-30 |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø125 mm |
| Stroke | 350 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 SAIJ125X350-30
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 125 | Bore size in mm. |
| ×350 | 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 SAIJ125X350-30 Is Used
Machine Changeover
Fine-tune the 320-350 mm travel window during product line changeovers to set new end positions rapidly without replacing the cylinder.
Heavy Assembly Pressing
Leverage the 6136 N push force at 0.5 MPa to securely seat large components, using the rear stopper to dial in the exact contact depth.
Variable End Stops
Implement adjustable retract positions on automated machinery, relying on the 40 mm air cushions to decelerate heavy 350 mm strokes smoothly.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125X350-30 the Right Cylinder?
Choose this 125 mm bore when a 100 mm bore (delivering 3927 N push at 0.5 MPa) lacks the thrust for heavy moving assemblies, or step down if the 80 mm bore (2513 N) is sufficient. An adjustable stroke is selected over a fixed SAI cylinder when you need variable end-stops to accommodate product size changeovers without physically swapping the actuator. Because this is a 350 mm stroke, the 32 mm rod should be guided externally to prevent excessive side-loading on the seals. For true load-holding without live air pressure, select a SAIL or BSAI cylinder, as the SAIJ adjuster is only a stop. To match this ISO 15552 footprint, verify the 125 mm bore, 350 mm stroke, 30 mm adjustment, PT G1/2 port, and your required mounting set (Basic, FA, LB, TC, FTC, TCM1, TCM2).
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 SAIJ125X350-30 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 its maximum 1.0 MPa pressure, it delivers up to 1251 kgf.
The rear adjuster acts as an external stopper that lets you shorten the effective travel from the nominal 350 mm down to 320 mm. This creates a 30 mm tuning window for commissioning without altering the cylinder mount.
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