Airtac SAIJ125 Adjustable Cylinder SAIJ125X175-40S
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125X175-40S is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø125mm bore and 175mm 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
- Stroke175 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2
- CushionAdjustable, 40 mm
About the Airtac SAIJ125 Adjustable Cylinder SAIJ125X175-40S
The AirTAC SAIJ125X175-40-S is a double-acting ISO 15552 profile cylinder equipped with a rear stroke adjuster, allowing you to fine-tune the effective travel within a 135-175 mm window. Delivering 6136 N of push force at 0.5 MPa, it handles heavy positioning tasks with precision. The extruded aluminum barrel features sensor grooves on both sides, and the integrated -S magnet enables position detection with AirTAC CMSE reed or DMSE solid-state switches.
Instead of swapping components to alter an end position, the external adjusting screw lets you dial back the nominal 175 mm stroke by up to 40 mm during commissioning. This cylinder uses a carbon steel rod and PT tapered port threads. Remember that the rear adjuster acts purely as a travel stop to set deceleration, not as a load-holding lock; for fail-safe position holding without live air, consider the SAIL or BSAI series.
Airtac SAIJ125 Adjustable Cylinder SAIJ125X175-40S Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125X175-40S |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø125 mm |
| Stroke | 175 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 SAIJ125X175-40S
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 125 | Bore size in mm. |
| ×175 | 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 SAIJ125X175-40S Is Used
Machine Changeover
Dial in the 135-175 mm travel window during product size transitions without replacing the cylinder or adding external mechanical stops.
Variable End-Stop Tuning
Use the rear adjuster to precisely set the retract position for varying material lengths on an automated assembly line.
Heavy Positioning
Leverage 6136 N of thrust at 0.5 MPa to shift heavy jigs into place, using the 40 mm adjustment to fine-tune the final resting coordinate.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125X175-40S the Right Cylinder?
Choose this 125 mm bore when your application requires substantial thrust—such as 6136 N at 0.5 MPa—and the ability to reconfigure end-stops on the fly. If your process demands less force, stepping down to a 100 mm bore yields 3927 N of push force at 0.5 MPa, whereas a 160 mm bore provides 10053 N for heavier loads. The adjustable-stroke mechanism is ideal for product changeovers on a packaging line where exact end positions vary by tens of millimeters, eliminating the need to bolt on external stops or swap a fixed-stroke SAI cylinder.
To match this ISO 15552 dimensionally interchangeable cylinder, specify a 125 mm bore, 175 mm nominal stroke, 40 mm adjustment range, PT tapered port threads, and the -S magnet option. Note that SAIJ supports a reduced mounting set—Basic, FA, LB, TC, FTC, TCM1, and TCM2—omitting the FB, CA, CB, and CR brackets. Because the 175 mm stroke is under the 300 mm threshold, side-load concerns are moderate, but an external guide is still recommended for heavy lateral loads.
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 SAIJ125X175-40S FAQ
At 0.5 MPa it provides 6136 N of push force and 5734 N of pull force. At 0.7 MPa the push force increases to 8590 N. The operating speed range for this 125 mm bore is 30-500 mm/s.
The rear adjusting screw acts as a mechanical stop that lets you shorten the effective travel from the 175 mm nominal stroke down to as little as 135 mm. It tunes the end position during commissioning but does not lock the load without live air pressure.
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