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Electronic Digital Indicator, 0.5"
 
 
 

Machinist's Calculator

Our mobile app; read this with your phone.
lmscnc.com/calc

 
Online Metals  

 

  

Bolt Circle Diameter Calculator

Calculator Menu

Enter values below to calculate the diameter of a bolt circle.

Number of Holes N
Center Distance Between Adjacent Holes in mm
 

Tip:

To measure the center distance between two holes of equal diameter with an electronic caliper.

1. Use the inside jaws to measure the diameter of one of the holes. Before you remove the caliper from the hole, press the button to zero the caliper while it is set to the diameter of the hole.

2. Still using the inside jaws, measure the distance between the far surfaces of the two holes. The caliper reading is the distance between centers of the two holes.

 
SPECIAL OF THE WEEK
Blocks, 1-2-3, Ultra Precision $24.95

More information
Blocks, 1-2-3, Ultra Precision
Sensitive Drill Feed and 1/8" (3 mm) Keyless Drill Chuck
  • Fingertip control for drilling small holes
  • Helps prevent drill breakage
  • 0JT taper, 1/2" diameter precision ground straight shank
  • Spring loaded 3/4” travel fits most drills, mills, lathes or jig borers
  • Capacity: 0” - 1/8" (0 - 3mm ) Keyless drill chuck

$141.95

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Electronic Digital Caliper, 6" Fractions IP67
  • Range: 0-6" (0-150 mm)
  • Accuracy: 0.001"/6"
  • Resolution: 0.0005" / 0.01mm / 64th
  • IP67: Dust tight, temporarily imersable
  • Operating Environment: 0-40°c

$59.99

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Tooling Plate, 6 x 12"
  • Made from aluminum plate 3/4" thick
  • Plate is 6" x 12"
  • 220 Holes tapped 1/4"-20, 72 holes for locating pins
  • Includes clamping kit
  • Designed for small work pieces

$139.95

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