Boltcalc Instructions

  1. Select the TYPE OF FASTENER, either a STUD or a BOLT.
  2. Select the TYPE OF Units, either English or Metric.
  3. Choose the type of flange. If the flange is a ANSI, API, or AWWA standard flange, select the correct class and size from the available selections. Select NONE to just perform a calculation on a fastener with any flange considerations.
  4. Select the FLANGE CLASS. If the TYPE OF FLANGE is NONE, the FLANGE CLASS, FLANGE SIZE, and GASKET MATERIAL boxes are disabled.
  5. Select the FLANGE SIZE. The available flanges will be determined by the TYPE OF FLANGE and the FLANGE CLASS. If the FLANGE TYPE is NONE, the FLANGE SIZE box is disabled.
  6. Select the GASKET TYPE. For ANSI flanges, the choices include several thicknesses of flat gasket material, spiral wound gaskets with and without backup rings, or the available ring joint gaskets for ring jointed ANSI flanges. For API flanges, the choices include all ring joint type gaskets that fit the selected flange. For AWWA flanges, the choices include several thicknesses of flat gasket material. If the FLANGE TYPE is NONE, the GASKET TYPE box is disabled.
  7. Select the FASTENER MATERIAL. The materials are sorted alphabetically.
  8. The K Factor is an experimentaly determined constant that relates the torque applied to the load induced in the fastener. This factor is affected by the condition of the fasteners, the lubricants used, and the condition of the flange. Choose the K-FACTOR that most closely matches your conditions.
    Scrolling the list displays a collection of common conditions and the corresponding K-factor. If none of the conditions fit the current application, the k-factor can be directly entered.
  9. If the flange is a standard ANSI, API or AWWA flange, the information about the fasteners will be displayed in the right hand column. Verify this information is correct. If the information is incorrect, or the flange is not a standard ANSI, API or AWWA flange, this information can be changed using the buttons for each item.
  10. Once the information on the screen is correct, select the desired requirement in the Outputs/Parameters section. Enter the target value when prompted. Click the CALCULATE button to find the other values corresponding to the one chosen.
  11. If the GASKET STRESS is greater or less than the recommended value, a warning will appear. This will also occur if the YIELD STRENGTH of the fastener is exceeded.