Airtac SAIJ125 Adjustable Cylinder SAIJ125X185-40
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125X185-40 is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø125mm bore and 185mm 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
- Stroke185 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2
- CushionAdjustable, 40 mm
About the Airtac SAIJ125 Adjustable Cylinder SAIJ125X185-40
The AirTAC SAIJ125X185-40 is a double-acting ISO 15552 profile cylinder featuring a rear stroke adjuster that allows you to fine-tune the end position. It provides a usable travel window of 145 to 185 mm, letting you dial back the nominal stroke by up to 40 mm during commissioning without adding external stops. Built with a carbon steel rod, it delivers a robust 6136 N pull force at 0.5 MPa and accepts PT tapered thread ports.
This bore size operates at a controlled speed range of 30-500 mm/s and includes variable air cushions at both ends to manage impact deceleration. The extruded aluminum barrel features sensor grooves on both sides for fitting CMSE reed or DMSE electronic switches, though this specific SKU ships without a magnet. It uses a reduced mounting set (Basic, FA, LB, TC, FTC, TCM1, TCM2) and omits FB, CA, CB, and CR brackets.
Airtac SAIJ125 Adjustable Cylinder SAIJ125X185-40 Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125X185-40 |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø125 mm |
| Stroke | 185 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 SAIJ125X185-40
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 125 | Bore size in mm. |
| ×185 | 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 SAIJ125X185-40 Is Used
Machine Setup Changeover
Dial in the exact 145 to 185 mm travel window during product changeover without physically swapping the cylinder or repositioning external stopper blocks.
Variable End-Stop Positioning
Fine-tune the retract end-position on heavy-duty presses to accommodate varying material thicknesses using the 40 mm rear adjustment screw.
Heavy-Duty Assembly Line
Leverage the 6136 N pull force to shift heavy pallets or tooling, relying on the adjustable stroke to synchronize multiple actuators on the line.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125X185-40 the Right Cylinder?
Choose this 125 mm bore cylinder when your application requires high thrust, such as the 6136 N pull force at 0.5 MPa, combined with variable end-stop positioning. If you need less force and a faster cycle, stepping down to an 80 mm bore yields 2268 N of pull force at 0.5 MPa. The rear adjuster screw acts purely as a mechanical stop to set the travel end and does not hold the load without live air pressure; for true fail-safe load holding, select the SAIL or BSAI series instead.
When replacing an ISO 15552 cylinder, match the 125 mm bore, 185 mm nominal stroke, 40 mm adjustment range, PT port thread, and mounting bracket style. Because this unit lacks the -S magnet suffix, it cannot trigger position sensors directly; add the -S option if you require CMSE or DMSE switch integration.
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 SAIJ125X185-40 FAQ
It features a rear adjusting screw that lets you shorten the effective stroke by up to 40 mm, creating a usable travel window of 145 to 185 mm. The adjuster acts as a mechanical stop to tune the end position and does not lock the load without continuous air pressure.
At an operating pressure of 0.5 MPa, the SAIJ125X185-40 provides 6136 N of pull force and 8590 N of push force. The maximum thrust reaches 11045 N when operated at 0.7 MPa.
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