Airtac SAIJ125 Adjustable Cylinder SAIJ125BX40-40S
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125BX40-40S is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø125mm bore and 40mm 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
- Stroke40 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2
- CushionAdjustable, 40 mm
- No minimum order. A single piece can be ordered.
- Ready in 3–5 business days. That is the time we take to process the order and hand it to the carrier. Transit time after that depends on the destination.
About the Airtac SAIJ125 Adjustable Cylinder SAIJ125BX40-40S
The AirTAC SAIJ125X40-40-S is a double-acting ISO 15552 profile cylinder with a 125 mm bore and a 40 mm nominal stroke. Equipped with a rear adjusting stopper, it provides a usable travel window of 0 to 40 mm, allowing you to dial back the full stroke by up to 40 mm during commissioning. It delivers a robust 6136 N pull force at 0.5 MPa, making it suitable for heavy-duty positioning tasks.
This variant features a SUS304 stainless steel rod (option B) for superior corrosion resistance and includes a magnet (-S) for use with AirTAC CMSE reed and DMSE electronic sensors. The extruded aluminum barrel includes sensor grooves on both sides. It uses a PT tapered G1/2 port and offers adjustable air cushions at both ends to decelerate the load smoothly.
Airtac SAIJ125 Adjustable Cylinder SAIJ125BX40-40S Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125BX40-40S |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø125 mm |
| Stroke | 40 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 SAIJ125BX40-40S
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 125 | Bore size in mm. |
| ×40 | 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 SAIJ125BX40-40S Is Used
Machine Changeover
Dial in the exact 0 to 40 mm end-stop during product size transitions without physically replacing the cylinder or adding spacers.
Heavy-Duty Positioning
Leverage the 6136 N pull force to move heavy assemblies, using the rear stopper to set the precise retracted position at commissioning.
Corrosive Assembly Lines
Rely on the SUS304 stainless steel rod and position-sensing magnet to operate reliably in washdown or corrosive manufacturing environments.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125BX40-40S the Right Cylinder?
Choose this 125 mm bore cylinder when your application requires substantial thrust—neighboring bore sizes offer 3927 N (100 mm) or 6136 N (125 mm) of pull force at 0.5 MPa. An adjustable stroke is preferred over a fixed SAI cylinder when you need to fine-tune the end position on a machine changeover without swapping the hardware or adding external stops. The rear adjuster acts purely as a travel stop and does not hold the load without live air; for true load-holding without pressure, consider the SAIL or BSAI series.
For an exact ISO 15552 replacement, match the 125 mm bore, 40 mm stroke, 40 mm adjustment code, PT G1/2 port, and the -S magnet requirement. The SAIJ mounting set includes Basic, FA, LB, TC, FTC, TCM1, and TCM2, omitting the FB, CA, CB, and CR options found on other variants.
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 SAIJ125BX40-40S FAQ
The rear adjusting screw acts as an external stopper, allowing you to shorten the effective stroke by up to 40 mm. This creates a 0 to 40 mm usable travel window for fine-tuning the end position without changing the cylinder itself.
At 0.5 MPa operating pressure, it provides 6136 N of pull force and 8590 N of push force. The maximum operating pressure is 1.0 MPa.
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Covers non-human-caused product damage.
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