Airtac SAIJ125 Adjustable Cylinder SAIJ125AX185-20
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125AX185-20 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 SAIJ125AX185-20
The AirTAC SAIJ125X185-20 is a double-acting ISO 15552 profile cylinder equipped with a rear stroke adjuster, allowing you to dial in the effective travel within a 165-185 mm window. Delivering 6136 N of push force at 0.5 MPa (up to 11045 N at 0.9 MPa), it handles heavy payloads with precision. The PT-threaded G1/2 port matches the bore's flow requirements, while the extruded aluminum barrel provides sensor grooves on both sides.
This unit features a SUS420J2 stainless steel rod (option A) for enhanced corrosion resistance compared to standard carbon steel. The rear adjuster acts purely as a mechanical stop to fine-tune the end position during commissioning; it does not lock the load without live air. For position holding without pressure, consider the SAIL or BSAI series instead.
Airtac SAIJ125 Adjustable Cylinder SAIJ125AX185-20 Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125AX185-20 |
|---|---|
| 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 SAIJ125AX185-20
| 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 SAIJ125AX185-20 Is Used
Product Changeover Adjustment
Fine-tune the end-of-stroke position up to 20 mm during line changeovers to accommodate slightly different product sizes without replacing the cylinder.
Heavy Fixture Positioning
Leverage 6136 N of thrust at 0.5 MPa to move and position heavy machining fixtures accurately within a 165-185 mm travel window.
Assembly Line Stopper
Use the rear mechanical stop to set precise retraction limits on automated assembly lines, ensuring consistent downstream indexing.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125AX185-20 the Right Cylinder?
Choose this 125 mm bore when a 100 mm bore (offering 3927 N at 0.5 MPa) cannot provide enough thrust, stepping up to 6136 N for heavier fixtures. The adjustable 165-185 mm travel window is ideal for product changeovers, letting you trim the stroke by up to 20 mm without adding external stops or swapping the cylinder. When replacing an ISO 15552 cylinder, verify the 185 mm stroke, 20 mm adjustment, PT G1/2 port, and mounting choice from the SAIJ set: Basic, FA, LB, TC, FTC, TCM1, or TCM2 (FB, CA, CB, and CR are omitted).
Since this model lacks the -S magnet option, it cannot host CMSE reed or DMSE electronic sensors directly. For strokes of 185 mm, while under the 300 mm threshold requiring external guides, always ensure the load is properly supported to minimize rod side-loading and maximize seal life.
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 SAIJ125AX185-20 FAQ
At 0.5 MPa, this 125 mm bore cylinder provides 6136 N of push force and 5734 N of pull force. At 0.9 MPa, the push force increases to 11045 N.
The rear adjuster acts as a mechanical stop that lets you shorten the 185 mm nominal stroke by up to 20 mm, providing a usable travel window of 165-185 mm. It only sets the end position and does not hold the load without live air pressure.
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