AMROK Workholding Foundations

Tombstones • Fixture Plates • Grid Plates • 4th Axis Trunnion Tables

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AMROK® Tombstones and Fixture Plates are designed to hold the industry's tightest tolerances for flatness, parallelism, perpendicularity, surface finish, and hole location. All Tombstones and grid plates are built and then inspected using AME's in-house Coordinate Measuring Machine (CMM).


AMROK® tombstones, tooling columns, and fixture plates are manufactured to the highest precision and quality standards with our precision tolerances.

  • Inserts allow positioning and clamping in every hole with co-axial positioned bushings.
  • Assures high wear resistance and replaceability with hardened precision bushings.
  • Replacement bushings and insert kits with an extraction tool are offered if needed.
Flatness (tombstones & plates) .0005 / 12x12
Parallelism (plates) .0005 / 12  Max .002 total
Perpendicularity .0008 / 12  Min .001, Max .002/48
Surface Finish 63 RMS
Face Thickness ≤18” = ±.001, >18” = ±.002
Tapped Holes (non accumulative) ±.005
Precision Bushing I.D. -0 / +.0006
Precision Bushing Concentricity 0.0001
Bored or Precision Bushing Hole to Adjacent Hole ±.0005
First Row Bushing Hole Location from Datums ±.001, ±.002 (Epoxy Mineral tombstones)
Bored or Precision Bushing Hole Spacing (non accumulative) 0-10 ±.0005, 10-20 ±.0008, 20-30 ±.0010, 30-40 ±.0012
(for aluminum, add 50% to these tolerances)

AMROK - Your Workholding Integrator.
Build on the Rock.

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