Airtac SAIJ125 Adjustable Cylinder SAIJ125X65-50
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125X65-50 is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø125mm bore and 65mm 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
- Stroke65 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2
- CushionAdjustable, 40 mm
About the Airtac SAIJ125 Adjustable Cylinder SAIJ125X65-50
The AirTAC SAIJ125X65-50 is a double-acting ISO 15552 profile cylinder featuring a rear stroke adjuster that creates a 15-65 mm usable travel window from its 65 mm nominal stroke. Delivering 6136 N of push force at 0.5 MPa, it handles heavy positioning tasks while allowing precise end-position tuning during commissioning without swapping the cylinder or adding external stops.
This bore uses a G1/2 port and a 32 mm carbon steel rod with an M27x2 thread to manage high side loads. It supports speeds of 30-500 mm/s and uses the SAIJ mounting subset (Basic, FA, LB, TC, FTC, TCM1, TCM2), omitting FB, CA, CB, and CR. The rear screw acts purely as a travel stop, not a lock, so live air is required to hold the load.
Airtac SAIJ125 Adjustable Cylinder SAIJ125X65-50 Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125X65-50 |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø125 mm |
| Stroke | 65 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 SAIJ125X65-50
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 125 | Bore size in mm. |
| ×65 | 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 SAIJ125X65-50 Is Used
Variable End Stops
Dial in the exact clamping distance on heavy machining fixtures, trimming the stroke back by up to 50 mm to accommodate different part sizes.
Machine Setup Tuning
Fine-tune the retract end position during commissioning to perfect the timing and alignment of heavy assemblies without machining new stopper blocks.
Product Changeover
Quickly reconfigure a heavy-duty conveyor diverter or press line by adjusting the travel window from 15 to 65 mm to handle varying product widths on the fly.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125X65-50 the Right Cylinder?
Choose this 125 mm bore when a 100 mm bore (providing 3927 N at 0.5 MPa) lacks the thrust for your heavy fixtures, or step down if the load is lighter. An adjustable stroke is selected over a fixed SAI when you need variable end-stops for product changeovers. For a direct ISO 15552 replacement match, specify the 125 mm bore, 65 mm stroke, 50 mm adjustment, PT tapered port threads, and no magnet (standard, without -S for CMSE/DMSE sensors).
Because the stroke is short, side-load stress is minimal, but always verify rod alignment. If the application requires true load-holding without live air pressure, the SAIJ adjuster cannot act as a brake; instead, specify an SAIL air-released lock, a BSAI clamp-lock, or an external rod lock.
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 SAIJ125X65-50 FAQ
At 0.5 MPa operating pressure, this 125 mm bore cylinder provides 6136 N of push thrust and 5734 N of pull thrust. It can deliver up to 1251 kgf at its maximum rated pressure of 1.0 MPa.
The rear adjuster screw allows you to trim the effective travel back by up to 50 mm from the 65 mm nominal stroke, creating a 15-65 mm usable travel window. This stopper sets the end position but does not lock the load; live air pressure is still required to hold the cylinder in place.
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