HD Bolt Fixing and Testing Terms Explained

The HD Bolt has an innovative and unique design. This means that anyone using them has to be aware of exactly how the dimensions of the bolts are measured, and the way in which these measurements are used during fitting.

The image above shows a pictorial representation of these measurements, while the details are set out below.

If you have further questions on the fixing terms of Blind Bolts please get in touch with us. Use the contact details at the bottom of the page or click here to send us an email

The Minimum Fixing Thickness

Minimum fixing thickness refers to the minimum distance which the bolt can fix. The combined thickness of the substances being fixed is used to produce this figure.

The Maximum Fixing Thickness

Maximum fixing thickness refers to the maximum distance which the bolt can fix. The combined thickness of the substances being fixed is used to produce this figure.

The Depth Clearance

Depth clearance is the minimum space needed inside a cavity wall in order for the legs on the HD bolt to be deployed effectively. This particular measurement has to be carefully noted when the HD bolt is being deployed in Steel Hollow Sections, in order to ensure that the bolt hasn’t reached the opposite section wall before the correct installation takes place.

The Shear Strength Over Thread

The shear strength over thread refers to a measure of the force required for the bolt to fail if the shear plane in question falls over the bolts threaded section. The ‘shear plane’ referred to is the area covering the materials which the bolt is fixing.

The Tensile Strength

The tensile strength refers to the pull-out force required for the bolt to fail when under the pressure of a tensile load.

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