Airtac SAIJ125 Adjustable Cylinder SAIJ125AX425-100S
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125AX425-100S 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 SAIJ125AX425-100S
The AirTAC SAIJ125X425-100-S is a double-acting ISO 15552 profile cylinder featuring a rear-mounted stroke adjuster. It delivers a robust 6136N pull force at 0.5 MPa and utilizes a SUS420J2 stainless steel rod (code A) for superior corrosion resistance. The integrated -S magnet enables precise position sensing with AirTAC CMSE reed and DMSE solid-state switches.
This specific model provides a generous 425 mm nominal stroke with a 100 mm adjustment range, yielding a flexible 325-425 mm usable travel window. The rear adjuster acts as a mechanical stop to decelerate the piston at the end of travel, but it is not a lock. The extruded aluminum barrel includes sensor grooves on both sides, and the PT tapered port threads ensure a tight pneumatic seal.
Airtac SAIJ125 Adjustable Cylinder SAIJ125AX425-100S Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125AX425-100S |
|---|---|
| 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 SAIJ125AX425-100S
| 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 SAIJ125AX425-100S Is Used
Machine Changeover
Dial in the 325-425 mm travel window during product size changes without replacing the entire cylinder or adding external stopper blocks.
End-Position Tuning
Fine-tune the retract end-of-stroke at commissioning using the rear screw, perfect for dialing in exact clamping or pressing distances.
Heavy Pressing
Leverage the 6136N pull force and SUS420J2 stainless rod for robust pressing operations in demanding, moisture-rich environments.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125AX425-100S the Right Cylinder?
Select this 125 mm bore cylinder when an application requires heavy thrust (6136N pull at 0.5 MPa) alongside variable end-position tuning. The 100 mm adjustment window is perfect for machine changeovers, allowing operators to dial in the exact 325-425 mm travel without swapping hardware. If your setup needs less force, step down to an 80 mm bore (2268N pull at 0.5 MPa). Because the stroke is 425 mm, an external guide is recommended to prevent excessive rod side-loading.
When replacing an ISO 15552 cylinder, match the 125 mm bore, 425 mm stroke, 100 mm adjustment, PT port threads, and -S magnet. SAIJ uses a reduced mounting set (Basic, FA, LB, TC, FTC, TCM1, TCM2) and omits FB, CA, CB, and CR brackets. For load-holding without live air pressure, the rear adjuster will not suffice; consider an external rod lock, a pilot-operated check valve, or the AirTAC SAIL and BSAI locking cylinder series.
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 SAIJ125AX425-100S FAQ
The rear adjuster screw lets you mechanically shorten the effective stroke by up to 100 mm. This creates a usable travel window of 325 to 425 mm, allowing you to fine-tune the end position without changing the cylinder.
At 0.5 MPa operating pressure, it provides 6136N of push force and 5734N of pull force. At the maximum 1.0 MPa pressure, it can deliver up to 1251 kgf.
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 SAIJ125AX425-100S
Send us the quantity and destination. We confirm price, stock and lead time — usually within 7-8 hours.