Airtac SAIJ125 Adjustable Cylinder SAIJ125X950-75
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125X950-75 is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø125mm bore and 950mm 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
- Stroke950 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2
- CushionAdjustable, 40 mm
About the Airtac SAIJ125 Adjustable Cylinder SAIJ125X950-75
The AirTAC SAIJ125X950-75 is a double-acting, single-rod ISO 15552 profile cylinder featuring a rear-mounted stroke adjuster. It delivers 6136N of push force at 0.5 MPa and uses a PT-tapered G1/2 port. The integrated adjuster allows you to trim the effective travel back by up to 75mm, creating an 875-950mm usable stroke window for precise end-position tuning.
This 125mm bore actuator relies on a 32mm carbon steel rod and M27x2 thread to handle substantial loads, while the extruded aluminum barrel incorporates sensor grooves on both sides. The rear stopper screw sets the retract end position mechanically, but it acts strictly as a travel stop and does not hold the load without live air pressure.
Airtac SAIJ125 Adjustable Cylinder SAIJ125X950-75 Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125X950-75 |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø125 mm |
| Stroke | 950 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 SAIJ125X950-75
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 125 | Bore size in mm. |
| ×950 | 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 SAIJ125X950-75 Is Used
Product Changeover
Dial in the 875-950mm travel window during format size changes on packaging lines without physically replacing the cylinder.
Machine Setup
Fine-tune the retract end-stop during initial commissioning to perfectly align heavy 6136N loads without adding external stops.
Variable End Stops
Adjust the rear mechanical stop on the fly to accommodate multiple part lengths in automated assembly equipment.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125X950-75 the Right Cylinder?
Choose this 125mm bore when an 80mm cylinder (providing 2513N push at 0.5MPa) lacks the thrust for heavy positioning tasks, but a 160mm unit is physically oversized. The adjustable 875-950mm window is perfect for applications requiring product changeovers or fine commissioning tweaks without swapping the actuator. Because the 950mm stroke is substantial, an external guide is recommended to prevent excessive rod side-loading.
For an exact ISO 15552 replacement match, verify the 125mm bore, 950mm stroke, 75mm adjustment, PT port thread, and mounting style (Basic, FA, LB, TC, FTC, TCM1, or TCM2). Note that the rear adjuster only decelerates the travel end; for true load-holding without continuous air pressure, select an SAIL or BSAI cylinder 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 SAIJ125X950-75 FAQ
At 0.5 MPa operating pressure, this 125mm bore cylinder provides 6136N of push force and 5734N of pull force. At 0.7 MPa, the push force increases to 8590N.
The rear adjuster acts as a mechanical stop that lets you shorten the 950mm nominal stroke by up to 75mm, resulting in an 875-950mm usable travel window. It sets the end position but does not lock the load without live air.
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