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FLANGE DIMENSION TOLERANCES, ASME B16.5
Keywords: Flange Dimension Tolerances, ASME B16.5, flange, flange,flanges, steel flanges,Sunny Steel,Weld Neck Flange
The ASME B16.5 - 1996 Pipe Flanges and Flange Fittings standard covers pressure-temperature ratings, materials, dimensions, tolerances, marking, testing, and methods of designating openings for pipe flanges and flanged fittings.
ASME B16.5 - Pipe Flanges and Flanged Fittings: NPS 1/2 through NPS 24 Metric/Inch Standard
TOLERANCE OF WELD NECK FLANGE DIMENSION TOLERANCES, ASME B16.5 (IN)
Dimension | Flange | Tolerance |
A | Outside Diameter | · When O.D. is 24" or less: ±1/16" (1.6mm) · When O.D. is over 24": ±1/8" (3.2mm) |
D | Inside Diameter | · 10" and smaller: ±1/32" (0.8mm) · 12" thru 18": +1/8" (3.2mm) · 20" and larger: -1/16" (1.6mm) |
B | Diameter of contact face | · 1/16" raised face: ±1/32" (0.8mm) · 1/4" Raised Face, Tongue & Groove (male & female): ±1/64" (0.4mm) |
J | 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) |
H | Diameter of hub at point of welding | · 5" and smaller: +3/32" (2.4mm), -1/32" (0.8mm) · 6" and larger: +5/32" (4.0mm), -1/32 (0.8mm) |
P | Drilling | · Bolt circle: ±1/16" (1.6mm) · Bolt hole spacing: ±1/32" (0.8mm) |
Eccentricity of bolt circle with respect to facing | · 2 1/2" and smaller ±1/32" (0.8mm) max. · 3" and larger ±1/16" (1.6mm) max. | |
C | Thickness | · 18" and smaller: ±1/8" (3.2mm), -0" · 20" and larger: ±3/16" (4.8mm), -0" |
K | Length of hub | · 10" and smaller: ±1/16" (1.6mm) · 12" and larger: ±1/8" (3.2mm) |
TOLERANCE OF BLIND, LAP JOINT, SLIP-ON, SOCKET, THREADED FLANGE DIMENSION TOLERANCES, ASME B16.5 (IN)
Dimension | Flange | Tolerance |
A | Outside Diameter | · When O.D. is 24" or less: ±1/16" (1.6mm) · When O.D. is over 24": ±1/8" (3.2mm) |
D | Inside Diameter | · Threaded: within limits of boring gauge · Lap Joint, Slip-on, Socket · 10" and smaller: ±1/32" (0.8mm), 0" · 12" and larger: -1/16" (1.6mm), 0" |
B | Diameter of contact face | · 1/16" raised face: ±1/32" (0.8mm) · 1/4" Raised Face, Tongue & Groove (male & female): ±1/64" (0.4mm) |
E, F, S | Diameter of bore | · Threaded (S): within limits of boring gauge · Lap Joint (F), Slip-on (E), Socket (E) · 10" and smaller: ±1/32" (0.8mm), 0" · 12" and larger: -1/16" (1.6mm), 0" |
P | Drilling | · Bolt circle: ±1/16" (1.6mm) · Bolt hole spacing: ±1/32" (0.8mm) · Eccentricity of bolt circle with respect to facing · 2 1/2" and smaller ±1/32" (0.8mm) max. · 3" and larger ±1/16" (1.6mm) max. |
C | Thickness | · 18" and smaller: ±1/8" (3.2mm), -0" · 20" and larger: ±3/16" (4.8mm), -0" |
L, M | Length of hub | · 18" and smaller: ±1/8" (3.2mm), ±1/32" (0.8mm) · 20" and larger: ±3/16" (4.8mm), ±1/16" (1.6mm) |