Airtac SAIJ125 Adjustable Cylinder SAIJ125AX50-40S
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125AX50-40S 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 SAIJ125AX50-40S
The AirTAC SAIJ125X50-40-S is a double-acting ISO 15552 profile cylinder featuring a rear stroke adjuster. It delivers a robust 6136N push force at 0.5 MPa, utilizing a 32mm SUS420J2 stainless steel rod and PT tapered G1/2 ports. The integrated -S magnet enables position sensing with CMSE reed and DMSE electronic switches.
This model provides a usable travel window of 10 to 50 mm, allowing you to dial back the nominal 50mm stroke by up to 40mm. This fine-tuning capability is ideal for product changeovers, letting you set exact end positions at commissioning without adding external stops. The rear adjuster acts purely as a travel stop to set deceleration, not as a lock, so live air is required to hold the load.
Airtac SAIJ125 Adjustable Cylinder SAIJ125AX50-40S Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125AX50-40S |
|---|---|
| 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 SAIJ125AX50-40S
| 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 SAIJ125AX50-40S Is Used
Machine Changeover Setup
Quickly fine-tune the end-stop from 10 to 50mm during product size transitions without swapping the cylinder or bolting on external stops.
Variable End-Position Clamping
Ideal for clamping stations where part thickness varies, using the rear adjuster to set precise, repeatable travel limits.
High-Force Positioning
Leverages 6136N of thrust at 0.5MPa for heavy pressing or lifting tasks that require exact end-position calibration.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125AX50-40S the Right Cylinder?
Choose this 125mm bore when you need higher force than the 100mm class (3927N at 0.5 MPa) but want to avoid the bulk of a 160mm body (10053N at 0.5 MPa). An adjustable stroke is preferred over a fixed SAI cylinder when your machine setup requires variable end stops or precise end-position tuning during product-size changes. For load-holding without live air pressure, the rear adjuster and air cushions will not suffice; you should pivot to a SAIL air-released lock or an external rod lock. To match this ISO 15552 footprint, specify the 125mm bore, 50mm stroke, 40mm adjustment, PT ports, and the -S magnet.
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 SAIJ125AX50-40S FAQ
At 0.5 MPa operating pressure, this 125mm bore cylinder provides 6136N of push force and 5734N of pull force. It can reach up to 8590N push force at 0.7 MPa.
The rear adjuster allows you to shorten the nominal 50mm stroke by up to 40mm, creating a usable travel window of 10 to 50mm. The adjuster functions as a mechanical stop for end-position tuning and does not hold the load without live air pressure.
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