Airtac SAIJ125 Adjustable Cylinder SAIJ125AX650-75S
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125AX650-75S 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 SAIJ125AX650-75S
The AirTAC SAIJ125X650-75-S is a double-acting ISO 15552 profile cylinder featuring a rear stroke adjuster that allows you to trim the effective travel back by up to 75 mm. This yields a usable stroke window of 575 to 650 mm, letting you dial in the exact end position during commissioning without adding external stops. The extruded aluminum barrel includes sensor grooves on both sides, and because this unit carries the -S magnet, it works seamlessly with AirTAC CMSE reed and DMSE solid-state switches.
In the 125 mm bore class, this actuator delivers 6136 N of push force and 5734 N of pull force at 0.5 MPa, climbing to 8590 N push at 0.7 MPa. The piston rod is built from SUS420J2 stainless steel (code A) for superior corrosion resistance, and the body uses PT tapered ports. It is a true profile cylinder, dimensionally interchangeable per ISO 15552, and omits the FB, CA, CB, and CR mounting styles in favor of the Basic, FA, LB, TC, FTC, TCM1, and TCM2 set.
Airtac SAIJ125 Adjustable Cylinder SAIJ125AX650-75S Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125AX650-75S |
|---|---|
| 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 SAIJ125AX650-75S
| 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 SAIJ125AX650-75S Is Used
Product Changeover Tuning
Dial in the 575-650 mm travel window during line changeovers to accommodate different product lengths without swapping out the entire actuator.
Heavy Press Positioning
Leverage the 6136 N push force at 0.5 MPa to position heavy stamping or press fixtures, using the rear stopper to set the exact bottoming point.
Automated Assembly End-Stop
Use the adjustable retract position to fine-tune the resting height of large assembly platens, ensuring precise alignment without external shims.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125AX650-75S the Right Cylinder?
Choose this 125 mm bore when an 80 mm bore (providing 2513 N push at 0.5 MPa) is too weak, but you want to avoid stepping up to a 160 mm bore that pushes 10053 N. The 75 mm adjustment range is ideal for machinery that requires frequent product-size changeovers, as the rear screw stopper fine-tunes the retract position on the fly. If your machine needs to hold a load statically without live air pressure, remember that the rear adjuster is only a travel stop, not a lock; you would need to specify a SAIL pneumatic lock or an external rod lock for fail-safe holding.
Because the 650 mm stroke is substantial, the 32 mm diameter rod and its M27x2 thread can handle significant side loads, but an external guide is still recommended to prevent binding over this long unsupported travel. When replacing an ISO 15552 cylinder, match the 125 mm bore, 650 mm stroke, PT port threads, and the desired mounting bracket. The operating speed is 30-500 mm/s, suited for heavy-duty actuation.
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 SAIJ125AX650-75S FAQ
At 0.5 MPa, this 125 mm bore cylinder provides 6136 N of push force and 5734 N of pull force. If you increase the operating pressure to 0.7 MPa, the push force rises to 8590 N.
The rear adjuster screw acts as a mechanical stop that lets you shorten the 650 mm nominal stroke by up to 75 mm, giving an effective travel range of 575 to 650 mm. It only sets the end-of-travel position and does not lock the load without live air pressure.
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 SAIJ125AX650-75S
Send us the quantity and destination. We confirm price, stock and lead time — usually within 7-8 hours.