Airtac SAIJ125 Adjustable Cylinder SAIJ125X240-10S
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125X240-10S is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø125mm bore and 240mm 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
- Stroke240 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2
- CushionAdjustable, 40 mm
About the Airtac SAIJ125 Adjustable Cylinder SAIJ125X240-10S
The AirTAC SAIJ125X240-10-S is a double-acting ISO 15552 profile cylinder equipped with a rear stroke adjuster. It delivers substantial thrust, generating 6136 N of pull force and 8590 N of push force at 0.5 MPa. The integrated -S magnet enables position sensing with AirTAC CMSE reed and DMSE electronic switches, which seat directly into the dual-side sensor grooves on the extruded aluminum barrel.
With a 10 mm adjustment range, this SKU allows you to fine-tune the effective travel to anywhere within a 230-240 mm window. This built-in adjustability eliminates the need to swap cylinders or add external stops during machine commissioning. The 32 mm carbon steel piston rod and M27x2 thread provide robust resistance to side loads, while the standard PT tapered porting ensures a reliable pneumatic connection.
Airtac SAIJ125 Adjustable Cylinder SAIJ125X240-10S Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125X240-10S |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø125 mm |
| Stroke | 240 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 SAIJ125X240-10S
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 125 | Bore size in mm. |
| ×240 | 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 SAIJ125X240-10S Is Used
Heavy-Duty End-Stop Tuning
Dial in the exact retract position of high-force actuators during machine commissioning without machining custom spacers or swapping components.
Product Size Changeover
Quickly adapt a 240 mm stroke to a 230 mm travel requirement on automated lines when processing different product dimensions.
Position Verification Systems
Leverage the built-in -S magnet alongside DMSE solid-state sensors to confirm end-of-stroke arrival in heavy industrial assembly machinery.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125X240-10S the Right Cylinder?
Choose this 125 mm bore adjustable model when an application requires high force combined with precise end-position tuning at changeover. If your process needs less thrust, stepping down to a 100 mm bore yields 3681 N of pull force at 0.5 MPa; conversely, moving up to a 160 mm bore provides 9425 N. The rear adjuster on this SAIJ cylinder acts strictly as a travel stop to set the retract position, not a lock. Because it cannot hold a load without live air pressure, applications requiring true fail-safe load holding should utilize an external rod lock or explore the SAIL or BSAI cylinder series.
When replacing an ISO 15552 cylinder, verify these exact specifications: 125 mm bore, 240 mm stroke, 10 mm adjustment, PT port thread, carbon steel rod, and a -S magnet. SAIJ supports a reduced mounting subset of Basic, FA, LB, TC, FTC, TCM1, and TCM2, omitting the FB, CA, CB, and CR styles. Operating speed for this bore is 30-500 mm/s.
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 SAIJ125X240-10S FAQ
The rear adjuster acts as an external stopper that lets you shorten the effective stroke by up to 10 mm. This creates a usable travel window of 230-240 mm, allowing precise end-position tuning at commissioning without changing the cylinder.
At 0.5 MPa, it provides 8590 N of push force and 6136 N of pull force. At 0.7 MPa, the push force increases to 11045 N.
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