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Have you seen?
DRO Scale, 12" (300 mm) with Display
 
 
Most Popular of
Layout Tools
Double Square Set, 4" and 6" 4R
Double Square Set, 4" and 6" 4R
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Machinist's Calculator

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

 
Onliine 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
Quick Change Turning & Facing Tool Holder, 0XA $12.95

More information
Quick Change Turning & Facing Tool Holder, 0XA
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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Revolving Tailstock Chuck Adapter, 3" Chuck, 2MT
  • CHUCK NOT INCLUDED: Mounts a 3" 3-jaw chuck in the tailstock
  • Three ball bearings provide support for heavy duty load and high speed.
  • Max Load: 1100 lbs.
  • Maximum Rated RPM: 4000
  • 2MT standard shank

$159.95

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Angle Gage, Digital
  • +/-180 Degree Range
  • Auto Off conserves battery life
  • 0.1 Degree Resolution
  • Compact and Lightweight design with ±0.1 Degree Repeatability
  • Mounting magnets on 3 sides to ensure accurate measurements

$36.95

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