Airtac SAIJ125 Adjustable Cylinder SAIJ125AX650-50
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125AX650-50 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 SAIJ125AX650-50
The AirTAC SAIJ125X650-50 is a double-acting ISO 15552 profile cylinder featuring a rear-mounted stroke adjuster. It provides a 650 mm nominal stroke that can be fine-tuned down by up to 50 mm, giving you a precise 600 to 650 mm usable travel window during commissioning. Delivering 8590 N of push force at 0.7 MPa, it handles heavy-duty positioning with ease.
This unit is built with a SUS420J2 stainless steel rod for superior corrosion resistance and utilizes PT tapered port threads. The extruded aluminum barrel includes sensor grooves on both sides. Because the rear adjuster acts strictly as a travel stop and relies on the variable air cushion for end-deceleration, it does not hold the load without live air pressure.
Airtac SAIJ125 Adjustable Cylinder SAIJ125AX650-50 Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125AX650-50 |
|---|---|
| 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 SAIJ125AX650-50
| 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 SAIJ125AX650-50 Is Used
Variable End-Stop Machining
Dial in the exact 600 to 650 mm clamping depth on machining fixtures without machining new hard stops.
Product Changeover Diverters
Quickly adjust the retract position on heavy conveyor diverters when handling different pallet sizes.
Heavy Press Positioning
Fine-tune the press stroke end-point on the factory floor to accommodate varying material thicknesses.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125AX650-50 the Right Cylinder?
Select this 125 mm bore when an 80 mm cylinder (providing 3518 N at 0.7 MPa) lacks the thrust for your application, but a 160 mm bore is physically oversized. The 50 mm adjustment range is ideal for product changeovers, allowing you to shift the end-stop without swapping the cylinder or adding external stops. For load-holding without continuous air pressure, consider an AirTAC SAIL or BSAI cylinder instead.
When replacing an ISO 15552 cylinder, verify the 125 mm bore, 650 mm stroke, 50 mm adjustment, PT ports, and mounting style. Supported mounts include Basic, FA, LB, TC, FTC, TCM1, and TCM2. Because this is a 650 mm stroke, the 32 mm rod diameter requires an external guide to prevent excessive side-loading on the piston.
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 SAIJ125AX650-50 FAQ
At an operating pressure of 0.7 MPa, this 125 mm bore cylinder provides 8590 N of push force and 8038 N of pull force. The maximum theoretical force at 1.0 MPa is 1251 kgf.
The rear adjuster screw allows you to shorten the 650 mm nominal stroke by up to 50 mm, creating a 600 to 650 mm travel window. It acts as a mechanical stop to fine-tune the end position and does not lock the load without air pressure.
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Covers non-human-caused product damage.
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Standard models usually ship in 3-4 days.
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