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Tolerance according to ANSI B 16.5

Threaded, Socket-Welding, Slip-on, Lap Joint & Blind

 Outside

 Diameter
  When OD is 24"  
  or Less
  ± 1/16" (1.6mm)

  When OD is
  Over 24"

  ± 1/8" (3.2mm)

   Inside


   Diameter

  Threaded   Within limits on
  Boring gauge
 Socket-Welding,
 Slip-on & Lap Joint
 10" & Similar
 + 1/32" (0.8mm),-0"
 12" & Larger
 + 1/16" (1.6mm),-0"
  Outside
  Diameter
  of Hub
 5" & Similar  + 3/32" (2.4mm)
 - 1/32" (0.8mm)
 6" & Larger  + 5/32" (4.0mm)
 - 1/32" (0.8mm)
  Diameter
  of Contact
  Face
 1/16" Raised Face  ± 1/32" (0.8mm)
 1/4" Raised Face
 Tongue & Groove
 Male, Female
 ± 1/64" (0.4mm)
  Diameter
  of
  Counterbore

Same as for
Inside Diameter

   Drilling  Bolt Circle   ± 1/16" (1.6mm)
 Bolt hole spacing   ± 1/32" (0.8mm)
 Eccentricity of
 Bolt circle with
 Respect to facing
 2½" & Similar
 + 1/32" (0.8mm)max
 3" & Larger
 + 1/16" (1.6mm)max
 Eccentricity of
 Bolt circle with
 Respect to Bore
 + 1/32"(0.8mm)max
 Eccentricity of
 Facing with
 Respect to Bore
 + 1/32"(3.2mm)max
 Thickness  18" & Smaller  + 1/8"(0.8mm), -0"
 20" & Larger  + 3/16"(4.8mm), -0"
 Length

 Thru Hub
 10" & Smaller  ± 1/16" (1.6mm)
 12" & Larger  ± 1/8" (3.2mm)
 

Welding Neck

 Outside

 Diameter
  When OD is 24"  
  or Less
  ± 1/16" (1.6mm)

  When OD is
  Over 24"

  ± 1/8" (3.2mm)

   Inside


   Diameter

  10" & Smaller   ± 1/32" (0.8mm)
  12" thru 18 "   ± 1/16" (1.6mm)
  20" & Larger   + 1/8" (3.2mm)
  - 1/16" (1.6mm)
  Diameter
  of Contact
  Face
 1/16" Raised Face  ± 1/32" (0.8mm)
 1/4" Raised Face
 Tongue & Groove
 Male, Female
 ± 1/64" (0.4mm)
  Diameter
  of Hub
  at Base
 When Hub Base is
 24" or Smaller
  ± 1/16" (1.6mm)
 When Hub Base is
 Over 24"
 ± 1/8" (3.2mm)
  Diameter of
  Hub at Point
  of Welding
 5" & Similar  + 3/32" (2.4mm)
 - 1/32" (0.8mm)
 6" & Larger  + 5/32" (4.0mm)
 - 1/32" (0.8mm)
   Drilling  Bolt Circle   ± 1/16" (1.6mm)
 Bolt hole spacing   ± 1/32" (0.8mm)
 Eccentricity of
 Bolt circle with
 Respect to facing
 2½" & Similar
 + 1/32" (0.8mm)max
 3" & Larger
 + 1/16" (1.6mm)max
 Eccentricity of
 Bolt circle with
 Respect to Bore
 + 1/32"(0.8mm)max
 Eccentricity of
 Facing with
 Respect to Bore
 + 1/32"(3.2mm)max
 Thickness  18" & Smaller  + 1/8"(0.8mm), -0"
 20" & Larger  + 3/16"(4.8mm), -0"
 Length

 Thru Hub
 10" & Smaller  ± 1/16" (1.6mm)
 12" & Larger  ± 1/8" (3.2mm)