Airtac SAIJ125 Adjustable Cylinder SAIJ125X65-30S
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125X65-30S 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 SAIJ125X65-30S
The AirTAC SAIJ125X65-30-S is a double-acting ISO 15552 profile cylinder featuring a rear-mounted stroke adjuster. By dialing back the nominal 65 mm travel by up to 30 mm, it provides a highly versatile 35-65 mm usable stroke window for precise end-position tuning. Belonging to the 125 mm bore class, it delivers a robust 6136 N push force at 0.5 MPa and 8590 N at 0.7 MPa, making it well-suited for heavy-duty positioning tasks.
This variant includes a standard carbon steel piston rod and PT tapered port threads (G1/2). Equipped with a magnetic piston (-S), it supports AirTAC CMSE reed and DMSE solid-state electronic sensors housed within the dual-side extruded aluminum barrel grooves. The rear adjuster acts purely as a travel stop for deceleration and end-position setting; it is not a locking mechanism, so live air pressure is required to hold the load securely in place.
Airtac SAIJ125 Adjustable Cylinder SAIJ125X65-30S Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125X65-30S |
|---|---|
| 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 SAIJ125X65-30S
| 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 SAIJ125X65-30S Is Used
Variable End-Stop Tuning
Dial in the exact 35 to 65 mm retract position during machine commissioning to accommodate varying product sizes without swapping out the cylinder.
Product Changeover
Rapidly adjust the effective stroke on automated lines when switching between different package lengths or material widths.
Heavy-Duty Positioning
Leverage the 6136 N push force at 0.5 MPa to move heavy pallets or tooling fixtures into their final retracted position with precise mechanical stops.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125X65-30S the Right Cylinder?
Choose this 125 mm bore adjustable cylinder when your application requires substantial thrust but variable end-stops for product changeovers. If your process demands 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. The SAIJ design is favored over a fixed-stroke SAI cylinder when you need to fine-tune the retract position at commissioning without adding external mechanical stops.
As a dimensionally interchangeable ISO 15552 cylinder, it matches standard mounting footprints using the Basic, FA, LB, TC, FTC, TCM1, and TCM2 accessory set, deliberately omitting FB, CA, CB, and CR mounts. For applications requiring positive load-holding without continuous air pressure, consider the SAIL (air-released lock) or BSAI (clamp-lock) series instead. Because the nominal stroke is 65 mm, no external guide is required for side-load support.
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 SAIJ125X65-30S FAQ
The cylinder has a nominal 65 mm stroke, but the rear adjuster allows you to shorten the effective travel by up to 30 mm. This creates a usable stroke window of 35 to 65 mm, enabling fine-tuning of the retract end-position without external stops.
At an operating pressure of 0.5 MPa, the SAIJ125X65-30-S generates a push force of 6136 N and a pull force of 5734 N. At 0.7 MPa, the push force increases to 8590 N.
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