Which fastening method is generally used with insulated glass units?

The use of machine bolts with insulated glass units is primarily due to the need for creating a strong, secure connection while maintaining the integrity of the glass assembly. Machine bolts provide consistent tensile strength and ensure that the glass units are properly held in place without risk of shifting or movement, which is critical in glazing applications to prevent structural issues or breakage.

Additionally, machine bolts allow for greater precision in installation, which is essential when working with insulated glass units that require careful alignment and secure fastening to maintain their thermal performance and structural integrity. These bolts are typically paired with nuts and washers to evenly distribute the load across a broader area, minimizing the risk of damage to the glass edges.

In contrast, the other options involve fastening methods that might not provide the same level of support or adjustability. For instance, wood screws may not have sufficient strength for the loads involved with insulated glass units, while lag bolts are designed primarily for heavy-duty wood applications. Self-tapping screws, while useful in various situations, may not offer the same level of reliability and strength needed when securing insulated glass.