Airtac SAIJ125 Adjustable Cylinder SAIJ125X500-50S
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125X500-50S is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø125mm bore and 500mm 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
- Stroke500 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2
- CushionAdjustable, 40 mm
About the Airtac SAIJ125 Adjustable Cylinder SAIJ125X500-50S
The AirTAC SAIJ125X500-50-S is a double-acting, single-rod ISO 15552 profile cylinder equipped with a rear stroke adjuster. It delivers 6136N of push force and 5734N of pull force at 0.5 MPa, providing robust actuation for heavy industrial loads. The integrated -S magnet enables position sensing via AirTAC CMSE reed or DMSE electronic solid-state switches mounted in the dual-side sensor grooves.
This specific SKU features a 500mm nominal stroke paired with a 50mm adjustment range, yielding a usable travel window of 450-500mm. This built-in adjustability allows operators to fine-tune the retract end-position during commissioning or product changeovers without adding external stops. The extruded aluminum barrel design incorporates variable air cushions at both ends to decelerate the 32mm carbon steel rod smoothly.
Airtac SAIJ125 Adjustable Cylinder SAIJ125X500-50S Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125X500-50S |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø125 mm |
| Stroke | 500 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 SAIJ125X500-50S
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 125 | Bore size in mm. |
| ×500 | 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 SAIJ125X500-50S Is Used
Variable End-Stop Changeover
Dial in the 450-500mm retract position during product family changeovers without swapping the cylinder or bolting on external mechanical stops.
Heavy Fixture Actuation
Leverage 6136N of push force at 0.5 MPa to move heavy machining fixtures, using the 50mm adjustment to fine-tune the clamping reach.
Long-Stroke Positioning
Use the 500mm travel for extending large workpieces, relying on the dual-side sensor grooves and -S magnet to track the full movement.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125X500-50S the Right Cylinder?
Choose this 125mm bore when a 100mm cylinder (providing 3927N push at 0.5 MPa) lacks the thrust for your heaviest fixtures, but a 160mm bore is physically oversized. The 50mm adjustment window is ideal for production lines running mixed product sizes, letting you dial in the exact end-stop on the fly. For position feedback, the -S magnet pairs directly with CMSE and DMSE sensors. Because the stroke is 500mm, the long unsupported rod requires an external guide to prevent excessive side-loading and premature seal wear.
To match this ISO 15552 dimensionally interchangeable cylinder, confirm your requirements: 125mm bore, 500mm stroke, 50mm adjustment, PT tapered port threads, and the reduced SAIJ mounting set (Basic, FA, LB, TC, FTC, TCM1, TCM2). Note that the rear adjuster acts only as a travel stop and does not hold the load without live air; for positive load-holding, select an AirTAC SAIL or BSAI cylinder.
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 SAIJ125X500-50S FAQ
At 0.5 MPa operating pressure, this 125mm bore cylinder generates 6136N of push force and 5734N of pull force. At the maximum 1.0 MPa pressure, it achieves 1251 kgf of push force.
The rear adjuster screw acts as a mechanical stop that lets you shorten the effective stroke from 500mm down to 450mm. This allows precise end-position tuning at commissioning without replacing the cylinder, though it does not lock the load without continuous air pressure.
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