ANSI B16.5 Flanges – Dimensional Tolerances

ASME B16.5 FLANGES DIMENSIONAL TOLERANCES:

WELDING NECK FLANGES
0 Outside Diameter When 0 is 24″ or less ±0.06″ ±1.6 mm
When O is over 24” ±0.12″ ±3.2 mm
R Diameter of Contact Face 0.06” (1.6 mm) raised face ±0.03″ ±0.8 mm
0.25″ (6.4 mm) raised face ±0.02″ ±0.5 mm
A Diameter of Hub at Point of Welding NPS 5 and smaller +0.09″, -0.03″ +2.4 mm, -0.8 mm
NPS 6 and larger +0.16″, -0.03″ +4.0 mm, -0.8 mm
B Inside Diameter NPS 10 and smaller ±0.03″ ±0.8 mm
NPS 12 to 18, inclusive ±0.06″ ±1.6 mm
NPS 20 and larger +0.12″, -0.06” +3.2 mm, -1.6 mm
X Diameter of Hub at Base When Hub Base is 24″ or less ±0.06″ ±1.6 mm
When Hub Base is over 24″ ±0.12″ ±3.2 mm
c Thickness NPS 18 and smaller +0.12″, -0.00″ +3.2 mm, -0.0 mm
NPS 20 and larger +0.19″, -0.00″ +4.8 mm, -0.0 mm
Drilling Bolt Circle Diameter ±0.06″ ±1.6 mm
Bolt Hole Spacing ±0.03″ ±0.8 mm
Eccentricity of Bolt Circle and Facing with Respect to Bore NPS 21/2 and smaller ±0.03″ ±0.8 mm
NPS 3 and larger ±0.06″ ±1.6 mm
Length Through Hub NPS 10 and smaller ±0.06″ ±1.6 mm
NPS 12 and larger ±0.12″ ±3.2 mm
SLIP-ON, LAP JOINT, SOCKET WELDING, THREADED and BLIND FLANGES
O Outside Diameter When O is 24″ or less
When O is over 24″		 ±0.06″ ±0.12″ ±1.6 mm
±3.2 mm
R Diameter of Contact Face 0.06″ (1.6 mm) raised face 0.25″ (6.4 mm) raised face ±0.03″ ±0.02″ ±0.8 mm
±0.5 mm
B Inside Diameter at Face of Socket Welding Flanges

Inside Diameter of Slip-On, Lap Joint, and Socket Welding

 NPS 10 and smaller
NPS 12 through 18, inclusive NPS 20 and larger		 ±0.03″ ±0.06″ +0.12″, -0.06″ ±0.8 mm
±1.6 mm
+3.2 mm, -1.6 mm
NPS 10 and smaller
NPS 12 and larger		 +0.03″, -0.00″ +0.06″, -0.00″ +0.8 mm, -0.0
+1.6 mm, -0.0 mm
Q Counterbore, Threaded Flanges NPS 10 and smaller
NPS 12 and larger		 +0.03″, -0.00″ +0.06″, -0.00″ +0.8 mm, -0.0
+ 1.6 mm, -0.0 mm
X Diameter of Hub at Base NPS 12 and smaller
NPS 14 and larger		 +0.09″, -0.06″ ±0.12″ +2.4 mm, -1.6
±3.2 mm
c Thickness NPS 18 and smaller
NPS 20 and larger		 +0.12″, -0.00″ +0.19″, -0.00″ +3.2 mm, -0.0
+4.8 mm, -0.0 mm
Drilling Bolt Circle Diameter Bolt Hole Spacing ±0.06″ ±0.03″ ±1.6 mm
±0.8 mm
Eccentricity of Bolt Circle and Facing with Respect to Bore NPS 2V2 and smaller
NPS 3 and larger		 ±0.03″ ±0.06″ ±0.8 mm
±1.6 mm
Overall Length Through Hub NPS 18 and smaller
NPS 20 and larger		 +0.12”, -0.03”
+0.19”, -0.03”		 +3.2 mm, -0.8 mm
+4.8 mm, -1.6 mm

Industrial Flanges Available Materials and Grades

Ample Alloys

Ample Alloys are Dominant Manufacturers, Stockists, Suppliers, and Exporters of Industrial Pipe Fittings using materials like Stainless Steel, Alloy, Super Duplex, Carbon, Hastelloy, Monel, Incoloy, Alloy 20, 254 SMO, Aluminium, Copper Nickel, Mild Steel at the most competitive price

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