Airtac SAIJ40 Adjustable Cylinder SAIJ40BX900-50S
The AirTAC Airtac SAIJ40 Adjustable Cylinder SAIJ40BX900-50S is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø40mm bore and 900mm 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
- Stroke900 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM12×1.25
- CushionAdjustable, 30 mm
About the Airtac SAIJ40 Adjustable Cylinder SAIJ40BX900-50S
The AirTAC SAIJ40X900-50-S is a double-acting, single-rod ISO 15552 profile cylinder equipped with a rear stroke adjuster. It provides a 628N push force at 0.5 MPa and uses a PT G1/4 port. The integrated -50 mm adjustment mechanism creates an exact 850-900 mm usable travel window, enabling precise end-position tuning without swapping out the physical cylinder.
This unit features a SUS304 stainless steel rod for superior corrosion resistance and is pre-fitted with a magnet for CMSE reed and DMSE electronic sensors. The extruded aluminum barrel includes sensor grooves on both sides. Because the 900 mm stroke is substantial, an external guide is strongly recommended to manage side-loading on the 16 mm rod and M12x1.25 thread.
Airtac SAIJ40 Adjustable Cylinder SAIJ40BX900-50S Technical Specifications
| Model | Airtac SAIJ40 Adjustable Cylinder SAIJ40BX900-50S |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø40 mm |
| Stroke | 900 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 SAIJ40BX900-50S
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 40 | Bore size in mm. |
| ×900 | 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 SAIJ40BX900-50S Is Used
Variable End-Stop Machining
Dial in the 850-900 mm travel window on the fly to accommodate different part lengths without changing out the entire cylinder assembly.
Product Changeover Systems
Use the rear adjuster to fine-tune the retraction point during line format changes, ensuring precise positioning for varying package sizes.
Long-Stroke Machine Setup
Commission long-travel machinery accurately by trimming the stroke up to 50 mm, compensating for mechanical tolerances without adding external stops.
Is the Airtac SAIJ40 Adjustable Cylinder SAIJ40BX900-50S the Right Cylinder?
Select this 40 mm bore when your application requires 628N push or 528N pull force at 0.5 MPa, and you need to dial in a long travel distance within an 850-900 mm window. If your changeover requires less force, the 32 mm bore offers 402N; if you need more clamping power, stepping up to the 50 mm bore yields 982N. The adjustable rear stopper is ideal for product changeovers, but remember it only acts as a travel stop—it does not hold the load without live air. For true position holding, consider an AirTAC SAIL or BSAI cylinder. To replace an ISO 15552 unit, match the 40 mm bore, 900 mm stroke, 50 mm adjustment, PT G1/4 port, and the -S magnet option. The SAIJ mounting set includes 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 SAIJ40 Adjustable Cylinder SAIJ40BX900-50S FAQ
The rear adjuster acts as a mechanical stop that allows you to shorten the effective stroke by up to 50 mm. This creates an 850-900 mm adjustable travel window, letting you fine-tune the end position at commissioning. It functions as a stop and does not lock the load without live air pressure.
At 0.5 MPa, it provides 628N of push force and 528N of pull force. At 0.7 MPa, the push force increases to 879N. The operational speed range for this bore size is 30-800 mm/s.
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