Airtac SAIJ125 Adjustable Cylinder SAIJ125X125-100
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125X125-100 is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø125mm bore and 125mm 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
- Stroke125 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2
- CushionAdjustable, 40 mm
About the Airtac SAIJ125 Adjustable Cylinder SAIJ125X125-100
The AirTAC SAIJ125X125-100 is a double-acting ISO 15552 profile cylinder featuring a rear-mounted stroke adjuster. It provides a broad usable travel window of 25 to 125 mm, allowing you to dial back the nominal stroke by up to 100 mm during commissioning without bolting on external stops. Built with a carbon steel piston rod and a PT tapered G1/2 port, it delivers a robust 6136 N pull force at 0.5 MPa.
This adjustable-stroke design is ideal for product changeovers on the line, letting you fine-tune the retract end-position on the fly. The extruded aluminum barrel includes sensor grooves on both sides, ready for CMSE reed and DMSE electronic solid-state switches. Unlike a fixed-stroke SAI, this model gives you a live mechanical stopper for variable end-positions, though the adjuster and air cushions only decelerate the load and will not hold it without live air pressure.
Airtac SAIJ125 Adjustable Cylinder SAIJ125X125-100 Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125X125-100 |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø125 mm |
| Stroke | 125 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 SAIJ125X125-100
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 125 | Bore size in mm. |
| ×125 | 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 SAIJ125X125-100 Is Used
Variable End-Stop Setup
Dial in the retract position from 25 to 125 mm during machine commissioning to perfectly seat parts without adding bulky external stopper hardware.
Product Size Changeover
Quickly adapt a packaging line to different carton sizes by turning the rear screw, shifting the effective stroke down by up to 100 mm in seconds.
High-Force Positioning
Leverage the 6136 N pull force at 0.5 MPa to push heavy molds or fixtures into place, relying on the fine-tune adjuster to prevent overtravel damage.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125X125-100 the Right Cylinder?
Choose this 125 mm bore when your application requires higher thrust than an 80 mm bore (which provides 2268 N pull at 0.5 MPa) but does not yet demand the 9425 N pull of a 160 mm bore. The generous 100 mm adjustment range is perfect for machines running multiple product sizes, replacing the need to physically swap cylinders for different stroke lengths. For exact ISO 15552 replacement matching, verify the 125 mm stroke, 100 mm adjuster, PT G1/2 port, and your required mounting bracket from the SAIJ set (Basic, FA, LB, TC, FTC, TCM1, TCM2).
Because the nominal stroke is 125 mm, side-load risks are minimal, but always ensure the M27x2 rod thread is properly aligned. Remember that the rear adjuster acts purely as a travel stop, not a lock; if you need true load-holding without continuous air pressure, consider the SAIL or BSAI series instead.
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 SAIJ125X125-100 FAQ
At 0.5 MPa operating pressure, this 125 mm bore cylinder provides 6136 N of pull force and 8590 N of push force. It can reach a maximum push force of 11045 N at 0.7 MPa.
The rear adjuster screw acts as a mechanical stop that lets you shorten the effective travel from the 125 mm nominal stroke down to as little as 25 mm. It allows precise end-position tuning during setup but does not lock the load without live air pressure.
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