Airtac SAIJ125 Adjustable Cylinder SAIJ125X270-100S
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125X270-100S is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø125mm bore and 270mm 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
- Stroke270 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2
- CushionAdjustable, 40 mm
About the Airtac SAIJ125 Adjustable Cylinder SAIJ125X270-100S
The AirTAC SAIJ125X270-100-S is a double-acting ISO 15552 profile cylinder with a rear mechanical stroke adjuster. It features a 125 mm bore and a 270 mm nominal stroke that can be dialed back by up to 100 mm, yielding a precise 170-270 mm usable travel window. This wide adjustment band allows operators to tune the retract end-position during commissioning or product changeovers without swapping out the physical cylinder or adding external stops. At 0.5 MPa, it generates 6136 N of push force and 5734 N of pull force, placing it firmly in the heavy-duty thrust class.
This unit includes a standard carbon steel piston rod and a -S magnet for position sensing. The integrated magnet triggers AirTAC CMSE reed and DMSE electronic solid-state switches housed in the dual-side sensor grooves of the extruded aluminum barrel. Fluid supply routes through PT G1/2 tapered ports, and the unit reaches speeds of 30-500 mm/s. The rear adjuster acts purely as a travel stop to set deceleration endpoints; it does not hold the load without live air pressure. For load-holding requirements without continuous air, consider an external rod lock or related AirTAC series like SAIL or BSAI.
Airtac SAIJ125 Adjustable Cylinder SAIJ125X270-100S Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125X270-100S |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø125 mm |
| Stroke | 270 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 SAIJ125X270-100S
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 125 | Bore size in mm. |
| ×270 | 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 SAIJ125X270-100S Is Used
Product Changeover Tuning
Dial the stroke back by up to 100 mm when switching a packaging line to a shorter box format, using the rear stopper to set the new end position without changing the cylinder.
Heavy-Duty Pressing
Leverage the 6136 N push force at 0.5 MPa for pressing bearings or forming parts, fine-tuning the exact retraction point during machine commissioning.
Variable End-Stop Positioning
Use the 170-270 mm travel window to accommodate varying material lengths on an automated assembly line, setting the precise retract distance via the external screw.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125X270-100S the Right Cylinder?
Selecting this 125 mm bore over the neighboring 100 mm version nearly doubles your thrust, stepping up from 3927 N to 6136 N at 0.5 MPa. The 100 mm adjustment range is ideal when a single machine must process multiple product sizes, letting you shift the end-stop by 100 mm on the fly instead of maintaining a stock of fixed-stroke SAI cylinders. When specifying an ISO 15552 replacement, match the 125 mm bore, 270 mm stroke, 100 mm adjuster, PT G1/2 port, and the -S magnet requirement. Mounting options are limited to the SAIJ subset: Basic, FA, LB, TC, FTC, TCM1, and TCM2 (omitting FB, CA, CB, and CR).
Because the 270 mm stroke is substantial, the 32 mm carbon steel rod and M27x2 thread provide a robust interface, but long unsupported strokes still require an external guide to prevent rod deflection and premature seal wear. The adjustable rear stopper sets the travel end but is not a lock. If the application requires the cylinder to hold a load statically without live air, you must integrate a pilot-operated check valve or switch to a SAIL air-released lock or BSAI clamp-lock cylinder.
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 SAIJ125X270-100S FAQ
At 0.5 MPa operating pressure, this 125 mm bore cylinder provides 6136 N of push force and 5734 N of pull force. At the maximum 1.0 MPa pressure, it can deliver up to 1251 kgf of push thrust.
The rear adjuster acts as a mechanical stop that shortens the effective travel from the 270 mm nominal stroke down to a minimum of 170 mm. It sets the retract end-position for fine-tuning but does not lock or hold the load without continuous air pressure.
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