Airtac SAIJ125 Adjustable Cylinder SAIJ125X700-20S
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125X700-20S 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 SAIJ125X700-20S
The AirTAC SAIJ125X700-20-S is a double-acting, single-rod ISO 15552 profile cylinder equipped with a rear stroke adjuster. It delivers a robust 6136N pull force at 0.5MPa and features a 700mm nominal stroke that can be fine-tuned backward by up to 20mm, yielding a precise 680-700mm usable travel window. The integrated magnet (-S) enables direct mounting of CMSE reed and DMSE electronic sensors along the dual-side barrel grooves.
This adjustable variant eliminates the need to physically swap cylinders during product changeovers, allowing operators to dial in the exact retract end-position via the external stopper screw. It uses a carbon steel piston rod with an M27x2 thread, and because the adjuster acts solely as a mechanical stop, it does not hold the load without live air pressure.
Airtac SAIJ125 Adjustable Cylinder SAIJ125X700-20S Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125X700-20S |
|---|---|
| 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 SAIJ125X700-20S
| 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 SAIJ125X700-20S Is Used
Variable End-Stop Tuning
Dial in the exact 680-700mm retract position during machine commissioning to compensate for mechanical tolerance stack-up without machining new spacers.
Product Size Changeover
Quickly adjust the retract depth by up to 20mm on a production line when switching to a slightly shorter workpiece, minimizing downtime.
Heavy-Duty Positioning
Leverage the 6136N pull force to push or pull heavy jigs into place, using the rear screw to set the precise resting coordinates.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125X700-20S the Right Cylinder?
Choose this 125mm bore when an application requires heavy thrust—such as 6136N pull at 0.5MPa—surpassing the 4523N push capacity of the 80mm bore. The adjustable 20mm end-stop is ideal for commissioning fine-tuning or accommodating slight product size variations without adding external stops. For load-holding without continuous air supply, select a SAIL pneumatic lock or BSAI clamp-lock cylinder instead, as the SAIJ adjuster is not a brake.
When replacing an ISO 15552 cylinder, match the 125mm bore, 700mm stroke, PT tapered port thread, and the required mounting accessory from the SAIJ subset (Basic, FA, LB, TC, FTC, TCM1, TCM2). Because this 700mm stroke is long, the M27x2 carbon steel rod will still experience deflection under high side loads; always guide the load externally to prevent rod binding.
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 SAIJ125X700-20S FAQ
At 0.5MPa operating pressure, this 125mm bore cylinder provides 6136N of pull force and 8590N of push force. It can reach a maximum push force of 11045N at 0.9MPa.
The rear adjuster screw acts as a mechanical stop that lets you shorten the 700mm stroke by up to 20mm, creating a 680-700mm travel window. It only sets the end position and does not lock the load without live air.
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