Airtac SAIJ125 Adjustable Cylinder SAIJ125X50-20S
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125X50-20S is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø125mm bore and 50mm 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
- Stroke50 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2
- CushionAdjustable, 40 mm
About the Airtac SAIJ125 Adjustable Cylinder SAIJ125X50-20S
The AirTAC SAIJ125X50-20-S is a double-acting ISO 15552 profile cylinder featuring a rear stroke adjuster. It delivers 6136 N push and 5734 N pull force at 0.5 MPa, making it suited for heavy-duty positioning. The built-in magnet (-S) supports CMSE reed and DMSE electronic sensors for precise end-of-stroke detection.
With a 50 mm nominal stroke and a 20 mm adjustment code, the usable travel window is 30-50 mm. This allows you to dial in the exact retract position during commissioning without adding external stops. The extruded aluminum barrel includes sensor grooves on both sides, and the mounting set covers Basic, FA, LB, TC, FTC, TCM1, and TCM2.
Airtac SAIJ125 Adjustable Cylinder SAIJ125X50-20S Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125X50-20S |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø125 mm |
| Stroke | 50 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 SAIJ125X50-20S
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 125 | Bore size in mm. |
| ×50 | 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 SAIJ125X50-20S Is Used
Machine Changeover
Fine-tune the 30-50 mm retract position on the fly when switching between product sizes on a packaging line.
Variable End Stops
Dial in the exact end-of-stroke position during setup without physically replacing the cylinder or adding external stopper blocks.
Heavy Assembly Pressing
Leverage the 6136 N push force at 0.5 MPa to securely seat heavy components while adjusting the final press depth.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125X50-20S the Right Cylinder?
Choose this 125 mm bore when 80 mm is insufficient, as the 80 mm version only provides 2513 N push force at 0.5 MPa. The adjustable 30-50 mm travel window is ideal for product changeovers on a line, letting you fine-tune the retract distance rather than swapping a fixed-stroke SAI cylinder. The PT tapered port threads ensure a tight pneumatic seal.
The rear adjuster acts purely as a mechanical stop to set the travel end and does not hold the load without live air pressure. For load-holding requirements without continuous air, consider the SAIL pneumatic lock or BSAI clamp-lock series 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 SAIJ125X50-20S FAQ
At 0.5 MPa, this 125 mm bore cylinder provides 6136 N of push force and 5734 N of pull force. At 0.7 MPa, the push force increases to 8590 N.
The rear adjuster screw lets you shorten the 50 mm nominal stroke by up to 20 mm, creating a 30-50 mm usable travel window. It functions as a mechanical stop to set the retract end position and is not a lock.
Authorized Export Seller
Genuine AirTAC parts produced by AirTAC factory.
1-Year Warranty
Covers non-human-caused product damage.
Fast Dispatch
Standard models usually ship in 3-4 days.
Fast Reply
Most inquiries answered within 7-8 hours.
Related AirTAC SAI Cylinders
Request a Quote for Airtac SAIJ125 Adjustable Cylinder SAIJ125X50-20S
Send us the quantity and destination. We confirm price, stock and lead time — usually within 7-8 hours.