Airtac SAIJ125 Adjustable Cylinder SAIJ125X105-20
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125X105-20 is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø125mm bore and 105mm 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
- Stroke105 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2
- CushionAdjustable, 40 mm
About the Airtac SAIJ125 Adjustable Cylinder SAIJ125X105-20
The AirTAC SAIJ125X105-20 is a double-acting ISO 15552 profile cylinder featuring a rear stroke adjuster that allows you to fine-tune the retract end position. It provides a usable travel window of 85 to 105 mm, enabling precise end-position tuning at commissioning without swapping the cylinder or bolting on external stops. Delivering a robust 6136 N pull force at 0.5 MPa, it handles heavy loads with ease.
This model features a 32 mm carbon steel piston rod and a G1/2 port. It uses adjustable air cushions at both ends to decelerate the load, but note that the adjuster acts only as a travel stop, not a lock, so it will not hold the load without live air pressure. The extruded aluminum barrel includes sensor grooves on both sides, ready for CMSE or DMSE switches if a magnet is added later.
Airtac SAIJ125 Adjustable Cylinder SAIJ125X105-20 Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125X105-20 |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø125 mm |
| Stroke | 105 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 SAIJ125X105-20
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 125 | Bore size in mm. |
| ×105 | 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 SAIJ125X105-20 Is Used
Product Changeovers
Dial in the 85-105 mm travel window during line changeovers to accommodate different product sizes without replacing the actuator.
Machine Setup
Fine-tune the retract end position at commissioning using the rear stopper, eliminating the need to add external shims or mechanical stops.
Heavy Clamping
Leverage the 8590 N push force at 0.5 MPa to secure heavy workpieces, using the adjustable stroke to set the exact clamping depth.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125X105-20 the Right Cylinder?
Select this 125 mm bore cylinder when your application requires significant force, offering 6136 N pull and 8590 N push at 0.5 MPa. If your setup needs less force, stepping down to a 100 mm bore yields 3681 N pull, which might be preferable for energy efficiency. The SAIJ125X105-20 is chosen over a fixed-stroke SAI cylinder when you need a variable end-stop to accommodate product changeovers or minor mechanical variations during machine setup.
For load-holding without continuous air pressure, this cylinder is not suitable as the rear adjuster only sets the travel end; you should look at the SAIL or BSAI series instead. This configuration uses a PT tapered port thread, carbon steel rod material, and the standard SAIJ mounting set (Basic, FA, LB, TC, FTC, TCM1, TCM2). Since the stroke is 105 mm, no external side-load guide is strictly required, but always ensure the load is adequately supported.
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 SAIJ125X105-20 FAQ
The SAIJ125X105-20 has a rear adjusting screw that acts as a stopper, allowing you to shorten the effective stroke by up to 20 mm. This creates a usable travel window of 85 to 105 mm, which can be fine-tuned at commissioning without changing the cylinder.
At an operating pressure of 0.5 MPa, this 125 mm bore cylinder generates a push force of 6136 N and a pull force of 5734 N. It can deliver up to 11045 N push force at its maximum rated pressure of 0.9 MPa.
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