Airtac SAIJ125 Adjustable Cylinder SAIJ125AX50-20
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125AX50-20 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 SAIJ125AX50-20
The AirTAC SAIJ125X50-20 is a double-acting ISO 15552 profile cylinder equipped with a rear stroke adjuster, letting you dial back the 50mm nominal travel by up to 20mm to achieve a precise 30-50mm usable window. It delivers robust thrust, pushing 6136N and pulling 5734N at 0.5 MPa, making it suited for heavy-duty positioning tasks. The piston rod is constructed from SUS420J2 stainless steel, offering high resistance to corrosion and premature wear in demanding environments.
This adjustable stopper enables fine end-position tuning at commissioning without swapping the cylinder or adding external stops. The integrated variable air cushions at both ends decelerate the load, but the adjuster acts only as a travel stop and does not hold the load without live air. For load-holding without pressure, a SAIL or BSAI variant is required. The extruded aluminum barrel features sensor grooves on both sides, ready for CMSE reed or DMSE electronic switches if a magnet is specified later.
Airtac SAIJ125 Adjustable Cylinder SAIJ125AX50-20 Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125AX50-20 |
|---|---|
| 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 SAIJ125AX50-20
| 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 SAIJ125AX50-20 Is Used
Machine Changeover
Quickly fine-tune the retract end-position during product size changes without physically swapping the actuator or bolting on external stops.
Heavy Pressing
Leverage the 6136N push force at 0.5 MPa for heavy pressing or holding operations, dialing in the exact 30-50mm travel distance.
Assembly Station Indexing
Index large pallets or components precisely, using the rear stopper to absorb final positioning variations safely.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125AX50-20 the Right Cylinder?
Select this 125mm bore when a 100mm bore (offering 3927N push at 0.5 MPa) lacks the necessary force, but a 160mm bore (10053N) is physically oversized. The SAIJ125X50-20 is chosen over a fixed-stroke SAI when a machine setup requires a variable end-stop to accommodate minor product-size changes on a line. Because the stroke is short (50mm), side-load stress on the 32mm rod is minimal, though external guides are always recommended for rigid loads.
To replace an ISO 15552 cylinder, match the 125mm bore, 50mm nominal stroke, 20mm adjustment range, PT tapered port thread, and the reduced SAIJ mounting set (Basic, FA, LB, TC, FTC, TCM1, TCM2). Note that this model omits the FB, CA, CB, and CR mounting styles. It operates at speeds of 30-500 mm/s.
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 SAIJ125AX50-20 FAQ
A rear adjusting screw acts as a mechanical stopper, allowing you to shorten the effective stroke from its 50mm nominal length down to 30mm. This provides a 30-50mm adjustable travel window for fine-tuning the retract end position at commissioning.
At 0.5 MPa operating pressure, the 125mm bore generates a push force of 6136N and a pull force of 5734N. At 0.9 MPa, the push force increases to 11045N.
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 SAIJ125AX50-20
Send us the quantity and destination. We confirm price, stock and lead time — usually within 7-8 hours.