06/02/2017

FLANGES ASME B 16.5 – Dimensional Tolerances

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Threaded, Socket-Welding, Slip-on, Lap Joint and Blind Flanges
 
Outside diameter*
When O.D. is <= 24" ± 1,6
When O.D. is > 24″ ± 3,2
Inside diameter Threaded to standard gauge limits
Socket-Welding, Slip-on and Lap Joing Sizes <= 10" + 0,8
– 0
Sizes > 10″ + 1,6
– 0
Diameter of Counterbore
(Threaded Flanges)
DN <= 10" + 0,8
– 0
DN > 10″ + 1,6
– 0
Diameter of Contact Face Raised face 1,6 ± 0,8
Raised face 6,4
Tongue and groove or male and female
± 0,5
Outside diameter of Hub*
Sizes <= 12" + 2,4
– 1,6
Sizes > 12″ + 4
– 0,8
Drilling Bolt circle ± 1,6
Bolt hole spacing ± 0,8
Eccentricity between bolt circle and facings <= 2 1/2” 0,8
>= 3″ 1,6
Length through Hub* Sizes <= 18" + 3,2
– 0,8
Sizes > 18″ + 4,8
– 1,6
Thickness Sizes <= 18" + 3,2
– 0
Sizes > 20″ + 5
– 0
  * Tolerance for these dimensions not covered by ASME B16.5. Thickness of hub at welding end shall never be less then 87.5% of the nominal thickness
 
Welding Neck Flanges
 
Outside diameter* When O.D. is <= 24" ± 1,6
When O.D. is > 24″ ± 3,2
Inside diameter Size <= 10" ± 0,8
Size 12″ through 18″ ± 1,6
Size >= 20″ ± 3,2
– 1,6
Diameter of Contact Face Raised face 1,6 ± 0,8
Raised face 6,4 ± 0,5
Tongue and Groove or Male and Female  
Diameter of Hub
at point of welding
Size <= 5" + 2,4
– 0,8
Size >= 6″ + 4
– 0,8
Outside diameter of Hub
at base*
Size <= 12" ± 1,6
Size > 12″ ± 3,2
Drilling Bolt circle ± 1,6
Bolt hole spacing ± 0,8
Eccentricity between bolt circle and facings <= 2 1/2” 0,8
>= 3″ 1,6
Length through Hub Sizes <= 4" ± 1,6
Sizes 5″ through 10″ ± 1,6
– 3,2
Sizes >= 12″ + 3,2
– 4,8
Thickness Sizes <= 18" + 3,2
– 0
Sizes >= 20″ + 5
– 0
  * Tolerance for these dimensions not covered by ASME B16.5. Thickness of hub at welding end shall never be less then 87.5% of the nominal thickness