Dimensions Threaded Flanges & Stud Bolts ASME B16.5

Threaded flange

Important  Information

NPS 1/2
Class 150 300 400 600 900 1500 2500
Diameter – A 30 38 38 38 38 38 43
Diameter – D 90 95 95 95 120 120 135
Thickness – B 9.6 12.7 14.3 14.3 22.3 22.3 30.2
11.2 14.3 20.7 20.7 28.7 28.7 36.6
Diameter – G 35.1 35.1 35.1 35.1 35.1 35.1 35.1
Diameter – K 60.3 66.7 66.7 66.7 82.6 82.6 88.9
Height – H 14 21 22 22 32 32 40
15.6 22.6 28.4 28.4 38.4 38.4 46.4
Bolt Holes 4 4 4 4 4 4 4
Diameter – L 15.9 15.9 15.9 15.9 22.2 22.2 22.2
Stud Bolts Diameter x Length
Diameter (in) 1/2 1/2 1/2 1/2 3/4 3/4 3/4
Length (mm) 55 65 75 75 110 110 120
NPS 3/4
CL 150 300 400 600 900 1500 2500
DIA
A
38 48 48 48 44 44 51
DIA
D
100 115 115 115 130 130 140
THK
B
11.2 14.3 15.9 15.9 25.4 25.4 31.8
12.8 15.9 22.3 22.3 31.8 31.8 38.2
DIA
G
42.9 42.9 42.9 42.9 42.9 42.9 42.9
DIA
K
69.9 82.6 82.6 82.6 88.9 88.9 95.2
H 14 24 25 25 35 35 43
15.6 25.6 31.4 31.4 41.4 41.4 49.4
No. 4 4 4 4 4 4 4
DIA
L
15.9 19.1 19.1 19.1 22.2 22.2 22.2
Stud Bolts Diameter x Length
DIA
(in)
1/2 5/8 5/8 5/8 3/4 3/4 3/4
Len
mm
65 75 90 90 115 115 125

NPS 1
CL 150 300 400 600 900 1500 2500
DIA
A
49.2 54 54 54 52 52 57
DIA
D
110 125 125 125 150 150 160
THK
B
12.7 15.9 17.5 17.5 28.6 28.6 35
14.3 17.5 23.9 23.9 35 35 41.4
DIA
G
50.8 50.8 50.8 50.8 50.8 50.8 50.8
DIA
K
79.4 88.9 88.9 88.9 101.6 101.6 108
H 16 25 27 27 41 41 48
17.6 26.6 33.4 33.4 47.4 47.4 54.4
No. 4 4 4 4 4 4 4
DIA
L
15.9 19.1 19.1 19.1 25.4 25.4 25.4
Stud Bolts Diameter x Length
DIA
(in)
1/2 5/8 5/8 5/8 7/8 7/8 7/8
Len
mm
65 75 90 90 125 125 140
NPS 1¼
CL 150 300 400 600 900 1500 2500
DIA
A
59 64 64 64 64 64 73
DIA
D
115 135 125 135 160 160 185
THK
B
14.3 17.5 20.7 20.7 28.6 28.6 38.1
15.9 19.1 27.1 27.1 35 35 44.5
DIA
G
63.5 63.5 63.5 63.5 63.5 63.5 63.5
DIA
K
88.9 98.4 98.4 98.4 111.1 111.1 130.2
H 19 25 29 29 41 41 52
20.6 26.6 35.4 35.4 47.4 47.4 58.4
No. 4 4 4 4 4 4 4
DIA
L
15.9 19.1 19.1 19.1 25.4 25.4 28.6
Stud Bolts Diameter x Length
DIA
(in)
1/2 5/8 5/8 5/8 7/8 7/8 1
Len
mm
70 85 95 95 125 125 150

NPS 1½
CL 150 300 400 600 900 1500 2500
DIA
A
65 70 70 70 70 70 79
DIA
D
125 155 155 155 180 180 205
THK
B
15.9 19.1 22.3 22.3 31.8 31.8 44.5
17.5 20.7 28.7 28.7 38.2 38.2 50.9
DIA
G
73.2 73.2 73.2 73.2 73.2 73.2 73.2
DIA
K
98.4 114.3 114.3 114.3 123.8 123.8 146
H 21 29 32 32 44 44 60
22.6 31.6 38.4 38.4 50.4 50.4 66.4
No. 4 4 4 4 4 4 4
DIA
L
15.9 22.2 22.2 22.2 28.6 28.6 31.8
Stud Bolts Diameter x Length
DIA
(in)
1/2 3/4 3/4 3/4 1 1 1⅛
Len
mm
70 90 110 110 140 140 170

NPS 2
CL 150 300 400 600 900 1500 2500
DIA
A
78 84 84 84 105 105 95
DIA
D
150 165 165 165 215 215 235
THK
B
17.5 20.7 25.4 25.4 38.1 38.1 50.9
19.1 22.3 31.8 31.8 44.5 44.5 57.3
DIA
G
91.9 91.9 91.9 91.9 91.9 91.9 91.9
DIA
K
120.7 127 127 127 165.1 165.1 171.4
H 24 32 37 37 57 57 70
25.6 33.6 43.4 43.4 63.4 63.4 76.4
No. 4 8 8 8 8 8 8
DIA
L
19.1 19.1 19.1 19.1 25.4 25.4 28.6
Stud Bolts Diameter x Length
DIA
(in)
5/8 5/8 5/8 5/8 7/8 7/8 1
Len
mm
85 90 110 110 145 145 180

NPS 2½
CL 150 300 400 600 900 1500 2500
DIA
A
90 100 100 100 124 125 114
DIA
D
180 190 190 190 245 245 265
THK
B
20.7 23.9 28.6 28.6 41.3 41.3 57.2
22.3 25.5 35 35 47.7 47.7 63.6
DIA
G
104.6 104.6 104.6 104.6 104.6 104.6 104.6
DIA
K
139.7 149.2 149.2 149.2 190.5 190.5 196.8
H 27 37 41 41 64 64 79
28.6 38.6 47.4 47.4 70.4 70.4 85.4
No. 4 8 8 8 8 8 8
DIA
L
19.1 22.2 22.2 22.2 28.6 28.6 31.8
Stud Bolts Diameter x Length
DIA
(in)
5/8 3/4 3/4 3/4 1 1 1⅛
Len
mm
90 100 120 120 160 160 195

Notes:

  • Dimensions are in millimeters unless otherwise indicated.
  • The length of the Stud Bolt does not include the height of the chamfers (points).
Measuring lengths of Stud Bolts and Hex bolts

Dimensional Tolerances of Threaded Flanges ASME B16.5

Outside Diameter
≤ 24 = 1.6 mm | > 24 = ± 3.2 mm
Inside Diameter
Within Limits on Boring Gauge
Diameter of Contact Face
1.6 mm Raised Face = ± 0.8 mm
6.35 mm Raised Face, Tongue & Groove / Male-Female = ± 0.4 mm
Drilling
Bolt Circle = 1.6 mm | Bolt Hole Spacing = ± 0.8 mm
Eccentricity of Bolt Circle with Respect to Facing
≤ 2½ = 0.8 mm max. | ≥ 3 = 1.6 mm max.
Outside Diameter of Hub
≤ 12 = + 2.4 mm / – 1.6 mm | ≥ 14 = ± 3.2 mm
Diameter of Counterbore
Same as forInside Diameter
Thickness
≤ 18 = + 3.2 mm / – 0 | ≥ 20 = + 4.8 mm / – 0
Length thru Hub
≤ 18 = + 3.2 mm / – 0.8 mm | ≥ 20 = + 4.8 mm / – 1.6 mm