Technical Assistance

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If you have questions about the physical properties of different granite types, answers can be found in our Granite Spec Sheets, found here.

Inserts might seem as simple as nuts in an assembly, but they play a crucial role for proper assembly of your stage, rails, clamps, etc., to the granite base. If even one insert pulls loose or has poor threads, your entire assembly is compromised.

Tru-stone uses 300-series certified stainless steel inserts so you don’t have to worry about rust. We turn our own inserts in our CNC Turning Centers and we use proper thread gages for quality control inspection. We turn a specially designed pattern on the outside diameter to maximize holding power of our proprietary mix of epoxy used to secure the inserts.

Minimum insert torque ratings from ASME B89.3.7-2013 and Federal Specification GGG-P-463c:

Tru-Stone Standard Insert Sizes

Standard Insert Sizes List.

Holes     Tru-stone is capable of providing holes for location, clearance, or weight reduction. Holes range from as small as .188” for air ports to large wire-sawn holes for hubs or clearance. If a hole must be placed near the edge, a good rule of thumb for design is to maintain a wall thickness of at least the diameter of the hole between the hole and the edge. This can of course vary with the size of the hole and thickness of the granite.

Further questions? We are here to assist you! Please call the Tru-Stone team at (800) 959-0517 or email