Airtac SAIJ125 Adjustable Cylinder SAIJ125AX65-20S
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125AX65-20S 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 SAIJ125AX65-20S
The AirTAC SAIJ125X65-20-S is a double-acting ISO 15552 profile cylinder featuring a rear stroke adjuster that allows you to fine-tune the retract end-position without adding external stops. With a 65 mm nominal stroke and a 20 mm adjustment range, it provides a usable travel window of 45-65 mm for precise machine setup. This bore size delivers 6136 N of push force at 0.5 MPa, scaling up to 11045 N at 0.9 MPa, making it well-suited for heavier actuation tasks.
This unit is configured with a SUS420J2 stainless steel rod (option A) for improved corrosion resistance and includes a magnet (-S) for electronic position feedback. The integrated sensor grooves on both sides of the extruded aluminum barrel accept AirTAC CMSE reed and DMSE solid-state switches. It features PT tapered port threads and uses variable air cushions at both ends to decelerate the load smoothly.
Airtac SAIJ125 Adjustable Cylinder SAIJ125AX65-20S Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125AX65-20S |
|---|---|
| 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 SAIJ125AX65-20S
| 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 SAIJ125AX65-20S Is Used
Variable End-Stop Tuning
Dial in the exact retract position within the 45-65 mm window during machine commissioning to accommodate varying product sizes without external spacers.
Heavy Pressing Operations
Leverage the 11045 N of push force at 0.9 MPa for high-load forming or pressing tasks that require precise end-of-stroke positioning and smooth air cushion deceleration.
Automated Changeover Lines
Quickly adjust the stroke on the fly during product line changeovers, utilizing the integrated magnet and DMSE sensors to confirm the adjusted end position.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125AX65-20S the Right Cylinder?
Select this 125 mm bore cylinder when your application requires high force within a short, variable travel window. If you need less force, stepping down to an 80 mm bore yields 2513 N of push force at 0.5 MPa, whereas moving up to a 160 mm bore provides 10053 N for heavier loads. The adjustable rear stopper is ideal for product changeovers, allowing you to dial in the exact end-position at commissioning rather than machining custom spacers or swapping out a fixed-stroke SAI cylinder.
When specifying a replacement, match the 125 mm bore, 65 mm stroke, 20 mm adjustment, PT port threads, and the -S magnet requirement. The mounting interface is dimensionally interchangeable per ISO 15552 and supports Basic, FA, LB, TC, FTC, TCM1, and TCM2 mounts (omitting FB, CA, CB, and CR). Remember that the rear adjuster acts only as a travel stop, not a lock; the cylinder will not hold its load without live air pressure. For true load-holding without continuous air, consider the SAIL or BSAI series instead.
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 SAIJ125AX65-20S FAQ
The rear adjuster screw acts as a mechanical stop that lets you trim the effective stroke back by up to 20 mm. This creates a usable travel window of 45-65 mm, allowing you to fine-tune the end position at commissioning without changing the cylinder or adding external stops.
At an operating pressure of 0.5 MPa, this cylinder provides 6136 N of push force and 5734 N of pull force. At 0.9 MPa, the push force increases to 11045 N.
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