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Bolt Circle Calculator

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Enter values below to calculate the coordinates of the holes in a bolt circle.

Number of Holes N
Diameter of Bolt Circle D   in  mm
Diameter of Holes d 
Angle of First Hole A  degrees
Offset of Center X     Y 
 
 
SPECIAL OF THE WEEK
Vise, 3" Screwless plus Parallels and Mounting Clamps $149.95

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Vise, 3" Screwless plus Parallels and Mounting Clamps
Quick Change Tool Holder - Lathe Bit Rapid Retractor, 0XA
Quick Change Tool Holder - Lathe Bit Rapid Retractor, 0XA
  • Works with 0XA tool post
  • Makes threading easier and safer
  • Made in the USA

$214.95
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Rotary Table, 4" Digital Readout with Tailstock, Dividing Plate, & 3-Jaw Lathe Chuck
Rotary Table, 4" Digital Readout with Tailstock, Dividing Plate, & 3-Jaw Lathe Chuck
  • Complete Rotary table and indexing solution
  • Includes 4" rotary table, diving plate, tailstock, and 3" 3-jaw chuck
  • Lock down clamps and t-slot nuts also included
  • Tailstock is adjustable in height
  • 2 Morse taper center hole

$668.95
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Disc Cutter Set, 1/4-5/8", 7 Piece
Disc Cutter Set, 1/4-5/8", 7 Piece
  • 7 Piece 1/4-5/8" Disc Cutter Set
  • Set includes 1/4, 5/16, 3/8, 7/16, 1/2, 9/16 & 5/8" disc sizes
  • Punches are made of case-hardened tool steel
  • The top and bottom plates are made of durable shock-resistant tool steel through hardened for long-w
  • Round disc cutters let you cut perfectly round discs in up to 1mm (18 gauge) thick metal sheets

$54.95
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Belt & Disk Sander, 1" x 30" Belt & 5" Disc
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Digital Position Readout, 2-Axis Mini Lathe
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