Airtac SAIJ125 Adjustable Cylinder SAIJ125X650-40S
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125X650-40S 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 SAIJ125X650-40S
The AirTAC SAIJ125X650-40-S is a double-acting, single-rod ISO 15552 profile cylinder equipped with a rear stroke adjuster. It delivers a robust 6136N push force at 0.5 MPa and features a 650mm nominal stroke that can be fine-tuned down by up to 40mm, creating a precise 610-650mm usable travel window. The integrated -S magnet enables position detection with AirTAC CMSE reed or DMSE electronic sensors.
Because the adjuster acts purely as a mechanical stop at the retract end, it allows rapid end-position tuning during commissioning without adding external stops. This extruded aluminum cylinder includes standard variable air cushions at both ends and utilizes a PT tapered port thread. It supports a speed range of 30-500mm/s, making it well-suited for heavy-duty cycling.
Airtac SAIJ125 Adjustable Cylinder SAIJ125X650-40S Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125X650-40S |
|---|---|
| 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 SAIJ125X650-40S
| 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 SAIJ125X650-40S Is Used
Product Changeover
Dial in the 610-650mm retract stop during format size changes on a packaging line without swapping out the entire actuator.
Heavy Press Fit
Leverage the 6136N push force at 0.5MPa to seat heavy mechanical components, using the adjuster to prevent over-travel.
Assembly Station Setup
Fine-tune the end-of-stroke position during initial machine commissioning to achieve exact clamping pressure on large parts.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125X650-40S the Right Cylinder?
Select this 125mm bore when a smaller 100mm bore (providing 3927N push at 0.5MPa) lacks the necessary thrust, but a 160mm bore is physically excessive. The adjustable 610-650mm travel window is ideal for machinery requiring frequent product changeovers, eliminating the need to physically swap cylinders for slightly different part sizes. For stroke lengths of 650mm, the 32mm diameter carbon steel rod handles significant loads, but an external guide is strongly recommended to prevent excessive side-loading on the piston.
To replace an ISO 15552 cylinder, match the 125mm bore, 650mm stroke, PT port thread, and -S magnet requirement. Remember that the rear adjuster and air cushions only decelerate the load; they do not hold position without live air. For true load-holding without pneumatic pressure, consider an AirTAC SAIL pneumatic lock or BSAI clamp-lock cylinder. The SAIJ mounting set includes Basic, FA, LB, TC, FTC, TCM1, and TCM2, deliberately omitting FB, CA, CB, and CR.
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 SAIJ125X650-40S FAQ
At 0.5 MPa operating pressure, this 125mm bore cylinder provides 6136N of push force and 5734N of pull force. At its maximum 1.0 MPa pressure, it can deliver up to 1251 kgf.
The rear mechanical stopper allows you to shorten the 650mm nominal stroke by up to 40mm, providing an effective travel window of 610-650mm. This stopper only sets the end position and does not lock the load without continuous air pressure.
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