Airtac SAIJ125 Adjustable Cylinder SAIJ125X250-100S
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125X250-100S is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø125mm bore and 250mm 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
- Stroke250 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2
- CushionAdjustable, 40 mm
About the Airtac SAIJ125 Adjustable Cylinder SAIJ125X250-100S
The AirTAC SAIJ125X250-100-S is a double-acting ISO 15552 profile cylinder equipped with a rear stroke adjuster. It provides a 150-250 mm usable travel window by allowing you to dial back the 250 mm nominal stroke by up to 100 mm. This bore size generates 6136 N of push force and 5734 N of pull force at 0.5 MPa, making it suitable for heavy-duty positioning. The standard carbon steel rod handles robust industrial loads, while the PT tapered port threads ensure a tight, leak-free pneumatic connection.
This model includes a magnet (-S) for use with AirTAC CMSE reed and DMSE electronic solid-state sensors, which mount directly into the extruded aluminum barrel grooves on both sides. The rear adjuster functions strictly as a mechanical stop to fine-tune the end position and is not a lock; it will not hold the load without live air pressure. For applications requiring true fail-safe load holding, consider the SAIL or BSAI series instead.
Airtac SAIJ125 Adjustable Cylinder SAIJ125X250-100S Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125X250-100S |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø125 mm |
| Stroke | 250 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 SAIJ125X250-100S
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 125 | Bore size in mm. |
| ×250 | 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 SAIJ125X250-100S Is Used
Variable End-Stop Tuning
Dial in the exact retract position within the 150-250 mm window during machine commissioning without adding external mechanical stops.
Product Changeover Lines
Quickly adjust the stroke length by up to 100 mm to accommodate varying product sizes on automated assembly equipment.
Heavy-Duty Positioning
Leverage 6136 N of push force at 0.5 MPa to move and position heavy pallets or fixtures with precise end-point control.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125X250-100S the Right Cylinder?
Choose this 125 mm bore cylinder when your application requires a 150-250 mm stroke window and high thrust, such as 6136 N at 0.5 MPa. If your force requirements are lower, stepping down to a 100 mm bore yields 3927 N of push force, which may improve cycle times and reduce air consumption. The 100 mm adjustment range is ideal for product changeover lines where the end-stop position frequently shifts, eliminating the need to physically swap out a fixed-stroke SAI cylinder.
When matching an ISO 15552 replacement, verify the 250 mm stroke, the 100 mm adjustment requirement, the G1/2 port size, and the PT thread type. The SAIJ series supports a reduced mounting set including Basic, FA, LB, TC, FTC, TCM1, and TCM2, but omits FB, CA, CB, and CR brackets. Because the 32 mm rod and M27x2 thread provide substantial side-load capacity, this cylinder handles robust dynamics, though any stroke over 300 mm would require an external guide. The operating speed is 30-500 mm/s.
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 SAIJ125X250-100S FAQ
At a 0.5 MPa operating pressure, this 125 mm bore cylinder generates 6136 N of push force and 5734 N of pull force. It can reach up to 11045 N of push force at 0.9 MPa.
The rear adjuster acts as a mechanical stop that lets you trim the 250 mm nominal stroke back by up to 100 mm, creating a usable travel window of 150 to 250 mm. It is not a locking device and requires live air to hold the load.
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