Granite Surface Plate Threaded Inserts

Granite Surface Plate Threaded Inserts

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...

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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:

 Standard Insert Sizes or GB Standard.

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.


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