Bolt & Stud Bolt Diameter and Length for ASME B16.5 Class 150 Flanges
Nominal Pipe Size, NPS
Diameter of Bolts, in.
Length of Bolts, L
Stud Bolts
Machine Bolts
2mm Raised Face
Ring Joint
2mm Raised Face
1/2
1/2
55
…
50
3/4
1/2
65
…
50
1
1/2
65
75
55
1 1/4
1/2
70
85
55
1 1/2
1/2
70
85
65
2
5/8
85
95
70
2 1/2
5/8
90
100
75
3
5/8
90
100
75
3 1/2
5/8
90
100
75
4
5/8
90
100
75
5
3/4
95
110
85
6
3/4
100
115
85
8
3/4
110
120
90
10
7/8
115
125
100
12
7/8
120
135
100
14
1
135
145
115
16
1
135
145
115
18
1 1/8
145
160
125
20
1 1/8
160
170
140
24
1 1/4
170
185
150
Notes:
Dimension of Table 7 are in Millimeters, except for diameters of bolts and bolts holes, which are in inch units.
Length of stud bolts does not include the height of the points.
Bolt lengths not shown in table may be determined in accordance with Annex D.
The Information contained in this data sheet is for reference purpose only and actual data may vary from product to product. Complete rely on these values for product design is not recommended. User will be solely responsible for any failure in intended construction.