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Tru-Stone utilizes quality people, quality materials and
quality methods resulting in high quality product.

Tru-Stone has the talent and capabilities to help you create the perfect part to serve as a component or the foundation of your design.

The quality of the final product directly relates to our integration of high quality parts, proven methods and workmanship.

More information on the physical properties of different granite types can be found by visiting our Granite Spec Sheets section on our Forms page.

Inserts
stainless-steel inserts, threaded inserts, unified threads, metric threadsInserts 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 Federal Specification GGG-P-463c:

Unified Threads
Metric Threads
Thread Size
Torque Rating
Thread Size
Torque Rating
.250"
7 ft. lbs.
M6
10 Nm
.3125"
15 ft. lbs.
M8
20 Nm
.375"
20 ft. lbs.
M10
27 Nm
.500"
25 ft. lbs.
M12
34 Nm
.625"
30 ft. lbs.
M16
41 Nm

Tru-Stone Standard Insert Sizes
View this chart in PDF format

THREAD SIZE THREAD DEPTH INSERT DIA. INSERT LENGTH
ANSI (in.) (in.) (in.)
4-40 0.280 0.500 1.250
6-32 0.345 0.625 1.250
8-32 0.410 0.625 1.250
10-32 0.475 0.625 1.250
1/4-20 0.625 0.625 1.250
5/16-18 0.781 0.625 1.250
3/8-16 0.938 0.625 1.250
1/2-13 1.250 0.750 2.000
5/8-11 1.550 1.000 2.250
3/4-10 1.875 1.250 3.000
1-8 2.500 1.250 3.000
       
METRIC (mm) (in.) (in.)
M3 x 0.5 7.50 0.281 1.000
M4 x 0.7 10.00 0.500 1.000
M5 x 0.8 12.50 0.500 1.000
M6 x 1 15.00 0.625 1.250
M8 x 1.25 20.00 0.625 1.250
M10 x 1.5 25.00 0.625 2.000
M12 x 1.75 30.00 0.750 2.000
M16 x 2 40.00 1.250 2.250
M20 x 2.5 50.00 1.250 2.500
M24 x 3 60.00 1.250 3.000
       
TAPERED      
1/8 NPT 0.625 0.750
1/4 NPT   0.750 1.250
3/8 NPT   1.000 2.000
1/2 NPT   1.250 2.000
       
SOLID BLANK      
SOLID BLANK   0.500 1.250
SOLID BLANK   0.625 1.250
SOLID BLANK   0.750 2.000
SOLID BLANK   1.000 2.000

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 vary with the size of the hole and thickness of the granite of course.

Straight Thru-Hole
Counterbored Hole
Double Counterbored Hole
straight thru-hole
counterbored hole
double counterbored hole

Slots
T-slots are commonly incorporated into granite bases for flexibility in fastener location. T-slots are typically milled into steel bar stock and glued into the granite base. T-slots can also be milled into the granite if required for your application.

Common slot
Embedded steel slot
Replaceable steel slot
common slot
embedded steel slot
replaceable steel slot

Slots milled into granite
slot milled into granite
slot milled into granite

LVDT
Adapters for LVDT Transducer assemblies are available in our typical configuration shown here or in a custom configuration to meet your application requirements.

Example of an LVDT assembly

Granite surface plates, Surface plates, Federal spec, Federal spec ggg-p-463c, Stands, Surface plate stands, Surface plate tables, Surface plate support,Block and wedge, Drawer stands, Cabinet stands, Granite cleaner, Surface plate cleaner, Waterless cleaner, Granite repair kits, Surface plate covers, Granite metrology accessories, flatness, flatness standards, metrology products, metrology accessory, metrology accessories, Motion system base, Granite machine base, Vacuum table, Wafer chuck, Vaccum, Granite specifications, Granite specs, Stainless steel inserts, Threaded inserts, Insert torque, Academy black, Imperial black, Zimbabwe black, Sierra gray, Tru-Clean, Tru clean, Lab grade, Laboratory grade, Inspection grade, Tool room grade, Toolroom grade, Grade AA, Grade A, Grade B, Metrology, Inspection plates
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Angle plate, Master angle, Granite reference masters, Master square, Straight edge, Parallels, v-blocks, vee blocks, universal right angle, granite cube, bench comparators, granite stands, step blocks, custom granite, lvdt, planekator, rahn, repeat-o-meter, granite calibration, ceramic calibration, granite certification, ISO 9001, ISO 17025, A2LA accredited, Granite resurfacing, Granite reconditioning, Granite lapping, Long form cert, 100 pound loading, unilateral tolerance, bilateral tolerance, repeat reading, repeat measurement, precision granite, ceramic, porous ceramic, dense ceramic, carbon fiber, machine bases, NIST traceable, Charcoal black, Pink granite, Black diabase, Impala, Vibration damping, Vacuum chuck, Granite assembly, Tru-vac , Air lift part transfer, Vacuum positioning, Mechanical clamping, Vacuum zone