Airtac SAIJ125 Adjustable Cylinder SAIJ125AX200-20
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125AX200-20 is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø125mm bore and 200mm 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
- Stroke200 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2
- CushionAdjustable, 40 mm
About the Airtac SAIJ125 Adjustable Cylinder SAIJ125AX200-20
The AirTAC SAIJ125X200-20 is a double-acting ISO 15552 profile cylinder featuring a rear-mounted stroke adjuster. It provides a usable travel window of 180 to 200 mm, allowing you to dial back the nominal 200 mm stroke by up to 20 mm during commissioning. Delivering 6136 N of push force at 0.5 MPa, it is built with a SUS420J2 stainless steel rod (code A) for enhanced corrosion resistance and features PT tapered ports.
This adjustable-stroke design eliminates the need to swap cylinders or add external stops when fine-tuning end positions on product changeovers. The extruded aluminum barrel includes sensor grooves on both sides for flexible mounting of CMSE reed or DMSE electronic switches. The rear adjuster functions strictly as a travel stop to set deceleration, not as a lock to hold the load without live air pressure.
Airtac SAIJ125 Adjustable Cylinder SAIJ125AX200-20 Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125AX200-20 |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø125 mm |
| Stroke | 200 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 SAIJ125AX200-20
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 125 | Bore size in mm. |
| ×200 | 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 SAIJ125AX200-20 Is Used
Variable End Stops
Dial in the exact retract position within the 180-200 mm window during machine setup to accommodate varying material thicknesses without adding physical shims.
Product Changeover
Quickly adjust the stroke by up to 20 mm on the production line when switching between product sizes, saving downtime compared to swapping a fixed SAI cylinder.
Heavy Forming Press
Leverage the 6136 N push force at 0.5 MPa for pressing operations while fine-tuning the bottom dead center to prevent over-travel and tool damage.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125AX200-20 the Right Cylinder?
Selecting this 125 mm bore model makes sense when your application requires the 6136 N thrust at 0.5 MPa (or up to 11045 N at 0.9 MPa) alongside precise end-position tuning. If your force requirements are lower, stepping down to an 80 mm bore yields 2513 N at 0.5 MPa, whereas a 160 mm bore provides 10053 N for heavier loads. The rear screw adjuster is ideal for variable end stops and machine setup, but if you need true load-holding without continuous air pressure, consider the SAIL or BSAI clamp-lock series instead.
When replacing an ISO 15552 cylinder, match the 125 mm bore, 200 mm stroke, 20 mm adjustment range, PT port thread, and the reduced SAIJ mounting set (Basic, FA, LB, TC, FTC, TCM1, TCM2). Note that FB, CA, CB, and CR mounts are omitted from this adjustable variant. Because the 200 mm stroke is below the 300 mm threshold, side-load concerns are minimal, but an external guide is still recommended for heavy radial 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 SAIJ125AX200-20 FAQ
At 0.5 MPa operating pressure, 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 effective travel from the 200 mm nominal stroke down to 180 mm. It is used for fine-tuning end positions at commissioning and does not lock the load without live air pressure.
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