Airtac SAIJ40 Adjustable Cylinder SAIJ40BX125-75S
The AirTAC Airtac SAIJ40 Adjustable Cylinder SAIJ40BX125-75S is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø40mm bore and 125mm stroke, G1/4 air ports and adjustable end cushioning. Its standardized mounting interface makes it a drop-in replacement for other ISO 15552 cylinders in automation lines.
- BoreØ40 mm
- Stroke125 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM12×1.25
- CushionAdjustable, 30 mm
About the Airtac SAIJ40 Adjustable Cylinder SAIJ40BX125-75S
The AirTAC SAIJ40X125-75-S is a double-acting, single-rod ISO 15552 profile cylinder equipped with a rear stroke adjuster. It delivers 628N of push force at 0.5 MPa and features a 125mm nominal stroke that can be fine-tuned backward by up to 75mm, creating a highly flexible 50-125mm usable travel window. This wide adjustment span is perfect for machinery requiring rapid product changeovers without physical hardware swaps.
Built with a SUS304 stainless steel rod (option B), this unit provides excellent corrosion resistance for demanding environments. The integrated magnet (-S) supports position sensing via AirTAC CMSE reed or DMSE electronic solid-state switches housed in the dual-side sensor grooves. It utilizes a PT tapered port and retains standard variable air cushions at both ends to decelerate the load smoothly.
Airtac SAIJ40 Adjustable Cylinder SAIJ40BX125-75S Technical Specifications
| Model | Airtac SAIJ40 Adjustable Cylinder SAIJ40BX125-75S |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø40 mm |
| Stroke | 125 mm |
| Acting type | Double acting |
| Port size | G1/4 |
| Rod thread | M12×1.25 |
| 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 – 800 mm/s |
| Cushion | Adjustable, 30 mm |
| Max stroke | Up to 1200 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 (Ø40mm)
| Pressure | Push force | Pull force |
|---|---|---|
| 0.5 MPa | 628 N | 528 N |
| 0.7 MPa | 880 N | — |
| Max (@1.0 MPa) | 128 kgf | |
Actual usable force is lower than theoretical due to friction and back-pressure. Size with a safety margin.
Model Code: Airtac SAIJ40 Adjustable Cylinder SAIJ40BX125-75S
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 40 | Bore size in mm. |
| ×125 | 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 SAIJ40 Adjustable Cylinder SAIJ40BX125-75S Is Used
Variable End-Stop Tuning
Dial in the exact retraction point between 50 and 125mm during commissioning to perfectly align packaging feeds without swapping out the entire actuator.
Machine Changeover
Quickly adapt the stroke length on automated lines processing different product sizes, using the rear screw to shift the end position rapidly.
Corrosive Setup Operations
Leverage the SUS304 stainless steel rod for precise, adjustable end-stop positioning in light manufacturing environments where moisture is present.
Is the Airtac SAIJ40 Adjustable Cylinder SAIJ40BX125-75S the Right Cylinder?
Select this 40mm bore when an application demands a broad end-position tuning range; its 75mm adjustment capacity vastly exceeds the fine-tuning typically needed for simple setup. If your changeover requirements are minimal or fixed, a standard SAI cylinder suffices, but this SAIJ variant eliminates the need to bolt on external stops. If you need to step up force, the 50mm bore offers 982N at 0.5 MPa; stepping down to a 32mm bore yields 402N. To replace an ISO 15552 cylinder, match the 40mm bore, 125mm stroke, PT G1/4 port, and the -S magnet.
Because the nominal stroke is 125mm, side-loading is less of a concern than with longer strokes, but always ensure the load is guided to prevent binding. Remember that the rear adjuster acts strictly as a travel stop and does not hold the load without live air; for true pneumatic locking without pressure, consider the SAIL or BSAI series. The SAIJ mounting set includes Basic, FA, LB, TC, FTC, TCM1, and TCM2, omitting FB, CA, CB, and CR options.
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 SAIJ40 Adjustable Cylinder SAIJ40BX125-75S FAQ
The rear adjuster acts as a mechanical stop that lets you trim the effective stroke back by up to 75mm from the 125mm nominal length, providing a usable travel window of 50-125mm. It sets the end position but does not lock the load without live air pressure.
At 0.5 MPa operating pressure, the SAIJ40X125-75-S provides 628N of push force and 528N of pull force. At 0.7 MPa, the push force increases to 879N.
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