Airtac SAIJ125 Adjustable Cylinder SAIJ125AX140-50S
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125AX140-50S is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø125mm bore and 140mm 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
- Stroke140 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2
- CushionAdjustable, 40 mm
About the Airtac SAIJ125 Adjustable Cylinder SAIJ125AX140-50S
The AirTAC SAIJ125X140-50-S is a double-acting ISO 15552 profile cylinder featuring a rear stroke adjuster that allows you to trim the nominal 140 mm travel back by up to 50 mm. This creates a highly flexible 90 to 140 mm usable end-position window, letting you dial in exact retraction distances during commissioning or product changeovers without adding external stops. It delivers substantial thrust, pushing with 6136 N and pulling with 5734 N at a 0.5 MPa operating pressure.
This specific SKU is built for durability and feedback, utilizing a SUS420J2 stainless steel rod (material code A) to resist corrosion in harsh environments. A magnetic piston is included (-S), enabling precise position detection when paired with AirTAC CMSE reed or DMSE solid-state sensors housed in the dual-side barrel grooves. The integrated variable air cushions at both ends decelerate the heavy 125 mm bore load, but the rear adjuster acts strictly as a travel stop, not a lock, so live air is required to hold the load.
Airtac SAIJ125 Adjustable Cylinder SAIJ125AX140-50S Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125AX140-50S |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø125 mm |
| Stroke | 140 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 SAIJ125AX140-50S
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 125 | Bore size in mm. |
| ×140 | 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 SAIJ125AX140-50S Is Used
Variable End-Stop Machining
Dial in the exact retraction point during machine setup to accommodate varying raw material lengths without swapping out the physical cylinder.
Product Changeover Systems
Quickly adjust the 90 to 140 mm travel window on packaging lines when switching between different product sizes, minimizing downtime.
Heavy-Duty Clamping Fixtures
Leverage the 6136 N push force to secure heavy workpieces, using the rear stopper to fine-tune the clamp depth precisely.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125AX140-50S the Right Cylinder?
Choose this 125 mm bore cylinder when your application requires high force (6136 N push at 0.5 MPa) alongside variable end-position tuning. If your setup only needs standard fixed travel without the rear adjuster, the base SAI cylinder offers the same ISO 15552 footprint. For lighter duty, stepping down to an 80 mm bore drops the push force to 2513 N but saves space. Because the 140 mm stroke is relatively short for this bore, side-loading is less of a concern, but the robust M27x2 rod thread handles substantial mechanical stress.
When specifying a replacement, ensure you match the exact 125 mm bore, 140 mm stroke, 50 mm adjustment range, PT tapered port thread, and the -S magnet requirement. Remember that the rear adjuster screw only sets the travel limit; it cannot hold a load without continuous air pressure. For true fail-safe load holding, consider the SAIL (air-released lock) or BSAI (clamp-lock) series instead. This SAIJ model supports the standard mounting set of Basic, FA, LB, TC, FTC, TCM1, and TCM2.
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 SAIJ125AX140-50S FAQ
At a standard 0.5 MPa operating pressure, this 125 mm bore cylinder provides a push force of 6136 N and a pull force of 5734 N. If pressure is increased to 0.7 MPa, the push force reaches 8590 N.
The rear adjuster screw allows you to shorten the nominal 140 mm stroke by up to 50 mm, creating a usable travel window of 90 to 140 mm. This stopper fine-tunes the end position but does not lock the load without live air pressure.
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