Airtac SAIJ125 Adjustable Cylinder SAIJ125X650-100S
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125X650-100S is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø125mm bore and 650mm 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
- Stroke650 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2
- CushionAdjustable, 40 mm
About the Airtac SAIJ125 Adjustable Cylinder SAIJ125X650-100S
The AirTAC SAIJ125X650-100-S is a double-acting, single-rod ISO 15552 profile cylinder equipped with a rear stroke adjuster. It delivers 6136 N of push force at 0.5 MPa and features a 650 mm nominal stroke that can be dialed back by up to 100 mm, creating a precise 550-650 mm usable travel window. This built-in adjustability allows you to fine-tune the retract end position during commissioning without swapping out the cylinder or adding external stops.
This model includes a magnet for position sensing and is designed with an extruded aluminum barrel housing sensor grooves on both sides. It accommodates AirTAC CMSE reed and DMSE electronic solid-state switches. The 32 mm carbon steel piston rod and M27x2 rod thread provide robust resistance against side loads, though a 650 mm stroke still requires an external guide to prevent rod bending under heavy lateral forces.
Airtac SAIJ125 Adjustable Cylinder SAIJ125X650-100S Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125X650-100S |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø125 mm |
| Stroke | 650 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 SAIJ125X650-100S
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 125 | Bore size in mm. |
| ×650 | 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 SAIJ125X650-100S Is Used
Variable End-Stop Positioning
Dial in the exact retract distance within the 550-650 mm window during machine commissioning to accommodate different material lengths without external stopper blocks.
Product Line Changeover
Quickly adjust the end-of-stroke position on packaging or handling lines when switching between product sizes, minimizing downtime between production runs.
Heavy-Duty Forming Setup
Leverage the 6136 N push force at 0.5 MPa for pressing or forming applications where the exact bottoming position must be fine-tuned on-site.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125X650-100S the Right Cylinder?
Select this 125 mm bore cylinder when an application requires substantial thrust—up to 6136 N push and 5734 N pull at 0.5 MPa—combined with variable end-stop positioning. If your setup needs less force, stepping down to a 100 mm bore yields 3927 N of push force at 0.5 MPa. The adjustable stroke is ideal for product-size changeovers on a line, whereas a fixed-stroke SAI cylinder is better for repetitive single-cycle tasks.
When replacing an ISO 15552 cylinder, match the 125 mm bore, 650 mm stroke, 100 mm adjustment range, PT tapered port threads, and the -S magnet option. Note that the rear adjuster acts strictly as a travel stop and does not hold the load without live air; for true load-holding without pneumatic pressure, consider an AirTAC SAIL locking cylinder or a BSAI clamp-lock model. Furthermore, this SAIJ variant supports a reduced mounting set of Basic, FA, LB, TC, FTC, TCM1, and TCM2, omitting FB, CA, CB, and CR brackets.
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 SAIJ125X650-100S 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 0.7 MPa, the push force increases to 8590 N.
The rear adjuster screw acts as a mechanical stop, allowing you to shorten the effective stroke from the nominal 650 mm down to 550 mm. It only sets the travel end and does not lock the load without live air pressure.
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