July Mini Lathe Sale - All our mini lathes and mini lathe packages are currently on sale. Lowest prices of the year!!!

Menu

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
Vise, 3" Screwless plus Parallels and Mounting Clamps $149.95

More information
Vise, 3" Screwless plus Parallels and Mounting Clamps
Electronic Digital Caliper, 6" Professional Grade
  • Z-Limit brand guarantees professional quality
  • Large, easy-to-read LCD display can be zeroed at any position
  • Automatic shut-off after 5 minutes of non-use, last measuring position retained when shut off
  • Hardened stainless steel body for long life, with fine adjustment thumb wheel
  • Resolution is 0.0005" (0.01mm) and linear accuracy meets DIN 862 standard

$64.95

More products like this
Turning & Boring Tools, 3/8" Indexable, Triangle Inserts
  • 4 turning tools
  • 1 - 6" boring tool
  • Inserts and torx wrenches
  • 3/8" shank
  • Uses TCMT-21.51 inserts

$86.95

More products like this
Collets, 3C Individual Sizes
  • Precision ground hardened steel
  • Externally threaded
  • For any machine or accessory that takes 3C collets

$0.00

More products like this