ASTM Class 5 Avoirdupois Cast Iron Calibration Weights - Nesting Slab

by Rice Lake



Rice Lake cast iron weights undergo a special phosphatizing process in which the metal is thoroughly cleaned and mildly etched to allow exceptional finish adhesion. The weights are then coated with a layer of chip-resistant paint which conforms to NIST Handbook 105-1 standards. This two-step process ensures a long-lasting finish that greatly reduces the possibility of corrosion. 


  • Nominal value marked on weight
  • Weight capacities of 10 kg/20 lb and up meet ASTM E617-18 and Handbook 44 specifications
  • Metric weights designated by gold paint
  • Avoirdupois (pound) weights designated by silver paint
  • Serial numbers may be stamped on weights (optional)


  • Field standards for testing industrial devices
  • Class III, Class IIIL or Class IIII
  • Testing for non-marked scales without
  • Class designation
  • Verifying scales are within specified accuracy and tolerances

Styles Available:

  • Grip-handle design for easy handling
  • Nesting slab weights for heavy-capacity weighing
  • Slotted weights and hangers for suspended weighing
  • Counterpoise weights for ratio weighing

Additional Accessories upon Request

  • NIST Traceable Certification
  • Serial Number