Airtac SAIJ40 Adjustable Cylinder SAIJ40BX75-50
The AirTAC Airtac SAIJ40 Adjustable Cylinder SAIJ40BX75-50 is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø40mm bore and 75mm 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
- Stroke75 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM12×1.25
- CushionAdjustable, 30 mm
About the Airtac SAIJ40 Adjustable Cylinder SAIJ40BX75-50
The AirTAC SAIJ40X75-50 is a double-acting ISO 15552 profile cylinder equipped with a rear stroke adjuster, delivering 879N of push force at 0.7 MPa. It features a SUS304 stainless steel rod and PT tapered ports. Because this specific SKU carries a 50mm adjustment code on a 75mm nominal stroke, you can dial the effective travel back to anywhere in a 25-75mm window during commissioning.
This wide trim range is ideal for product changeovers on a line, letting you set exact end positions without swapping the cylinder or adding external stops. The rear screw acts purely as a travel stop and works alongside the standard 30mm air cushions to decelerate the load; it does not hold the load without live air. For load-holding without pressure, consider a SAIL or BSAI variant.
Airtac SAIJ40 Adjustable Cylinder SAIJ40BX75-50 Technical Specifications
| Model | Airtac SAIJ40 Adjustable Cylinder SAIJ40BX75-50 |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø40 mm |
| Stroke | 75 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 SAIJ40BX75-50
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 40 | Bore size in mm. |
| ×75 | 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 SAIJ40BX75-50 Is Used
Product Changeovers
Quickly reconfigure the 25-75mm travel window for different packaging sizes without replacing the cylinder or bolting on external stops.
Machine Setup
Fine-tune the retract end position during commissioning to dial in exact clamping or ejection distances on the fly.
Variable End Stops
Use the wide 50mm trim range to test multiple end-of-stroke positions in prototyping cells before finalizing a fixed stroke.
Is the Airtac SAIJ40 Adjustable Cylinder SAIJ40BX75-50 the Right Cylinder?
Choose this 40mm bore when you need 879N of push force at 0.7 MPa, stepping up from a 32mm bore that provides 563N, or down from a 50mm bore offering 1374N. The 50mm adjustment range on a 75mm stroke gives exceptional flexibility for variable end stops and rapid machine setup.
To match this exact configuration for an ISO 15552 replacement, specify a 40mm bore, 75mm stroke, 50mm adjustment, PT ports, SUS304 rod material, and no magnet. Since the nominal stroke is under 300mm, side-load stress is minimal, but long unsupported loads still require an external guide. Mounting options include 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 SAIJ40BX75-50 FAQ
The rear adjuster screw lets you mechanically shorten the effective stroke by up to 50mm. This creates a usable travel window of 25-75mm from the 75mm nominal stroke, allowing precise end-position tuning without changing the cylinder.
At 0.7 MPa operating pressure, the SAIJ40X75-50 provides 879N of push force and 739N of pull force. It can deliver up to 1130N push at 0.9 MPa.
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