Airtac SAIJ125 Adjustable Cylinder SAIJ125X700-50S
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125X700-50S is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø125mm bore and 700mm 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
- Stroke700 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2
- CushionAdjustable, 40 mm
About the Airtac SAIJ125 Adjustable Cylinder SAIJ125X700-50S
The AirTAC SAIJ125X700-50-S is a double-acting, single-rod ISO 15552 profile cylinder equipped with a rear mechanical stroke adjuster. It provides a 50 mm trim window, allowing you to dial the effective travel down from a 700 mm nominal stroke to a 650 mm minimum. In the 125 mm bore class, it delivers 6136 N of push force at 0.5 MPa and up to 11045 N at 0.9 MPa, making it suitable for heavy-duty positioning tasks. This variant includes a magnet for position sensing and uses standard carbon steel for the piston rod.
Because the adjuster functions strictly as a travel stop at the retract end, it cannot hold a load without continuous air pressure. For load-holding requirements, an external pilot-operated check valve or a related AirTAC series like SAIL or BSAI is required. The extruded aluminum barrel features dual-side sensor grooves compatible with CMSE reed and DMSE solid-state switches, while the PT tapered port threads ensure a tight pneumatic connection.
Airtac SAIJ125 Adjustable Cylinder SAIJ125X700-50S Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125X700-50S |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø125 mm |
| Stroke | 700 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 SAIJ125X700-50S
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 125 | Bore size in mm. |
| ×700 | 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 SAIJ125X700-50S Is Used
Heavy Press Fine-Tuning
Dial in the exact 650-700 mm retract position during machine setup to accommodate varying material thicknesses without physically changing the cylinder.
Product Changeover Stops
Adjust the end-stop on the fly when switching a conveyor line between different package sizes, utilizing the 50 mm trim window to hit new positions.
Large Assembly Positioning
Move heavy assemblies with up to 11045 N of force at 0.9 MPa while precisely setting the final clamping or placement coordinates at commissioning.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125X700-50S the Right Cylinder?
Choose this 125 mm bore cylinder when your application requires substantial thrust—such as 6136 N at 0.5 MPa—and a highly specific end-of-travel position that falls within the 650 to 700 mm window. The rear adjuster allows you to fine-tune the retract position during commissioning or product changeovers without swapping out the physical cylinder or adding external stopper blocks. If your force requirements are lower, stepping down to a 100 mm bore provides 3927 N of push force at 0.5 MPa, whereas moving up to a 160 mm bore yields 10053 N.
When replacing an ISO 15552 cylinder, match the 125 mm bore, 700 mm stroke, 50 mm adjustment range, PT port threads, and the -S magnet option. The SAIJ mounting set includes Basic, FA, LB, TC, FTC, TCM1, and TCM2, intentionally omitting FB, CA, CB, and CR. Because the stroke is 700 mm, the 32 mm rod diameter and M27x2 thread provide rigidity, but an external guide is strongly recommended to prevent excessive side-loading on the long unsupported travel.
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 SAIJ125X700-50S 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 0.9 MPa, the push force rises to 11045 N.
The rear adjuster acts as a mechanical stop that lets you shorten the 700 mm nominal stroke by up to 50 mm, creating a usable travel window of 650 to 700 mm. It only sets the end position and does not lock the load without live air pressure.
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