» Flange & Fitting » ASME B16.5 Class 300 Lap Joint Flange

ASME B16.5 Class 300 Lap Joint Flange

August 15, 2019

Technical Drawing

300LB lap joint flange drawing

A typical drawing for Class 300 lap joint flange, ASME B16.5.

Bolts for 300LB lap joint flange

Both machine bolt with nuts and stud bolt with nuts can be applied to 300# lap joint flange.

Dimensions of 300# Lap Joint Flanges

NPSDBXK
1/29522.93866.7
3/411528.24882.6
112534.95488.9
1-1/413543.76498.4
1-1/215550.070114.3
216562.584127.0
2-1/219075.4100149.2
321091.4117168.3
3-1/2230104.1133184.2
4255116.8146200.0
5280144.4178235.0
6320171.4206269.9
8380222.2260330.2
10445277.4321387.4
12520328.2375450.8
14585360.2425514.4
16650411.2483571.5
18710462.3533628.6
20775514.4587685.8
22840565.2640743.0
24915616.0702812.8
*D: outside diameter of flange; K: diameter of bolt circle; B: minimum bore diameter; X: diameter of hub at base; All units are mm.

NPSndlL
1/245/81/2-
3/443/45/8-
143/45/8-
1-1/443/45/8-
1-1/247/83/4-
283/45/8-
2-1/287/83/4-
387/83/4-
3-1/287/83/4-
487/83/4-
587/83/4-
6127/83/4-
81217/8-
10161-1/81-
12161-1/41-1/8-
14201-1/41-1/8-
16201-3/81-1/4-
18241-3/81-1/4-
20241-3/81-1/4-
22241-5/81-1/2-
24241-5/81-1/2-
*n: number of bolts; d: diameter of bolt holes; l: diameter of bolts; L: length of machine bolt or stud bolt, calculated according to Non-mandatory Appendix C; All units are mm except that d and l are provided in inch.

NPSYTrWeight
1/22214.330.62
3/42515.931.10
12717.531.33
1-1/42719.151.65
1-1/23020.762.44
23322.382.83
2-1/23825.484.25
34328.6105.78
3-1/24430.2107.27
44831.8119.55
55135.01112.2
65236.61315.5
86241.31324.1
109547.71334.4
1210250.81350.4
1411154.01370.9
1612157.21389.5
1813060.413111
2014063.513137
2214566.713
2415269.913204
* Y: length through hub;  T: minimum thickness of 300LB lap joint flange; r: corner bore radius of lapped flange and pipe; Weight: approximate weights/masses of the flange; All units are in mm except that weights are in kg.

ASME B16.5 Lap Joint Flanges, Classes
150#300#400#600#
900#1500#2500#-
*Click to view the dimensions and weights of lap joint flanges of each pressure rating.

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