Airtac SAIJ125 Adjustable Cylinder SAIJ125AX650-30S
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125AX650-30S 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 SAIJ125AX650-30S
The AirTAC SAIJ125X650-30-S is a double-acting ISO 15552 profile cylinder featuring an integrated rear stroke adjuster. It delivers 6136 N of push force and 5734 N of pull force at 0.5 MPa, stepping up to 8590 N push at 0.7 MPa for heavy-duty cycles. The built-in stopper allows you to trim the effective travel down from the 650 mm nominal stroke, providing a 620-650 mm usable window for precise end-position calibration.
This unit includes a SUS420J2 stainless steel rod (option A) for improved corrosion resistance and uses PT tapered port threads with a G1/2 connection. The extruded aluminum barrel incorporates sensor grooves on both sides, and because this is a -S model, it includes a magnet ready for AirTAC CMSE reed or DMSE electronic solid-state switches. The rear adjuster acts purely as a travel stop to set deceleration and end limits, not as a load-holding lock.
Airtac SAIJ125 Adjustable Cylinder SAIJ125AX650-30S Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125AX650-30S |
|---|---|
| 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 SAIJ125AX650-30S
| 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 SAIJ125AX650-30S Is Used
Machine Changeover Calibration
Dial in the 620-650 mm travel window during product format changes to set new end positions instantly without replacing the actuator.
Heavy Press Positioning
Leverage 8590 N of thrust at 0.7 MPa to move heavy jigs, using the rear stopper to fine-tune the final pressing depth accurately.
Variable End-Stop Assembly
Establish precise, adjustable mechanical endpoints on automated assembly lines where nominal stroke lengths require minor field trimming.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125AX650-30S the Right Cylinder?
Choose this 125 mm bore when an 80 mm bore (providing 2513 N push at 0.5 MPa) lacks the thrust for your heaviest moving assemblies, but you want to avoid stepping up to a 160 mm frame. The 30 mm adjustment range is highly valuable during product changeovers, allowing operators to dial in the exact end-of-stroke position without machining new hard stops or physically swapping out the cylinder for a fixed-stroke SAI variant.
Because the 650 mm stroke creates a long lever arm on the 32 mm rod, you must use an external guide to prevent excessive side loading and premature seal wear. For any application requiring the load to be held in place without continuous live air pressure, note that the SAIJ rear stopper and air cushions cannot hold the load; you should instead utilize a SAIL pneumatic lock, a BSAI clamp-lock cylinder, or an external pilot-operated check valve. This profile cylinder is dimensionally interchangeable per ISO 15552 mounting interfaces.
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 SAIJ125AX650-30S FAQ
The rear adjusting screw acts as an external stopper that shortens the effective travel. For this model, the 650 mm nominal stroke can be dialed back by up to 30 mm, giving a usable travel window of 620 to 650 mm. The adjuster sets the end position and deceleration point, but it does not lock or hold the load without live air pressure.
At 0.5 MPa, it provides 6136 N of push force and 5734 N of pull force. At 0.7 MPa, the push force increases to 8590 N. The maximum thrust is 1251 kgf (approx. 12270 N) at 1.0 MPa.
Authorized Export Seller
Genuine AirTAC parts produced by AirTAC factory.
1-Year Warranty
Covers non-human-caused product damage.
Fast Dispatch
Standard models usually ship in 3-4 days.
Fast Reply
Most inquiries answered within 7-8 hours.
Related AirTAC SAI Cylinders
Request a Quote for Airtac SAIJ125 Adjustable Cylinder SAIJ125AX650-30S
Send us the quantity and destination. We confirm price, stock and lead time — usually within 7-8 hours.