Airtac SAIJ125 Adjustable Cylinder SAIJ125AX425-50S
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125AX425-50S is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø125mm bore and 425mm 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
- Stroke425 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2
- CushionAdjustable, 40 mm
About the Airtac SAIJ125 Adjustable Cylinder SAIJ125AX425-50S
The AirTAC SAIJ125X425-50-S is a double-acting ISO 15552 profile cylinder featuring a rear stroke adjuster that creates a 375-425 mm usable travel window. Delivering 6136 N of push force at 0.5 MPa, it handles heavy loads while allowing fine end-position tuning during commissioning without external stops. The SUS420J2 stainless steel rod (code A) provides excellent corrosion resistance for harsh environments.
Equipped with a magnet (-S), it integrates seamlessly with AirTAC CMSE reed and DMSE electronic sensors via the dual-side extruded barrel grooves. This model utilizes PT tapered ports and includes variable air cushions at both ends to manage deceleration across its 30-500 mm/s operating speed range.
Airtac SAIJ125 Adjustable Cylinder SAIJ125AX425-50S Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125AX425-50S |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø125 mm |
| Stroke | 425 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 SAIJ125AX425-50S
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 125 | Bore size in mm. |
| ×425 | 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 SAIJ125AX425-50S Is Used
Product Size Changeovers
Quickly reconfigure machinery for different product lengths by dialing the rear adjuster to shift the 375-425 mm travel window without mechanical rebuilds.
Heavy Clamping Fixtures
Leverage the 6136 N push force at 0.5 MPa to secure heavy workpieces, using the fine stroke adjustment to tune the exact clamping depth.
Automated Press Assembly
Apply precise pressing force over a long travel distance, relying on the dual air cushions to decelerate the load smoothly before the adjustable stop.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125AX425-50S the Right Cylinder?
Select this 125 mm bore cylinder when a 100 mm bore (3927 N push at 0.5 MPa) lacks the thrust for your fixture, but an 80 mm bore is entirely undersized. The 50 mm adjustment range is perfect for product changeovers, letting you dial in the exact end-stop on the fly rather than swapping cylinders or machining external stopper blocks. Remember that the rear adjuster is a travel stop, not a lock; the SAIJ does not hold position without live air. For load-holding requirements, consider an AirTAC SAIL or BSAI cylinder.
Because the 425 mm stroke is substantial, the 32 mm rod diameter and M27x2 thread provide robust support, but an external guide is strongly recommended to prevent excessive side-loading on the piston rod. As a dimensionally interchangeable ISO 15552 unit, it matches standard mounting footprints but uses a reduced SAIJ mounting set: Basic, FA, LB, TC, FTC, TCM1, and TCM2 (omitting FB, CA, CB, and CR).
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 SAIJ125AX425-50S 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 a maximum 1.0 MPa, the push force reaches 1251 kgf.
The rear adjuster acts as an external stopper, allowing you to shorten the nominal 425 mm stroke by up to 50 mm, creating a 375-425 mm usable travel window. It is a travel stop for fine-tuning end positions, not a lock, and does not hold the load without continuous air pressure.
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