ASME B16.5 Class 300 RTJ Facing Dimensions

August 28, 2019

Technical Drawings

Figure-1: the ASME B16.5 flange with a ring-type joint (RTJ) facing. P – pitch diameter of groove; G – minimum diameter of raised portion; F – upper width of groove; r – radius at bottom of groove; E – depth of groove, equal to height of raised portion; 23°: slope angle of side wall.

Figure-2: a RTJ joint consisting of two RTJ flanges and a metallic ring gasket which rests in the ring-joint groove. h: approximate distance between flanges. N: groove number.

Figure -3: The stud bolt with two nuts for the connection of two RTJ flanges. Its length is denoted as L (L does not include the height of the points).

ASME B16.5 Class 300 RTJ Facing Dimensions

NPS	Groove No.	P	E	F
1/2	11	34.14	5.54	7.14
3/4	13	42.88	6.35	8.74
1	16	50.80	6.35	8.74
1-1/4	18	60.33	6.35	8.74
1-1/2	20	68.27	6.35	8.74
2	23	82.55	7.92	11.91
2-1/2	26	101.60	7.92	11.91
3	30	117.48	7.92	11.91
3-1/2	34	131.78	7.92	11.91
4	37	149.23	7.92	11.91
5	41	180.98	7.92	11.91
6	45	211.12	7.92	11.91
8	49	269.88	7.92	11.91
10	53	323.85	7.92	11.91
12	57	381.00	7.92	11.91
14	61	419.10	7.92	11.91
16	65	469.90	7.92	11.91
18	69	533.40	7.92	11.91
20	73	584.20	9.53	13.49
22	81	635.00	11.13	15.09
24	77	629.15	11.13	16.66

*Table 300#-1, all dimensions are in mm.

NPS	r	G	h	L
1/2	0.8	51.0	3	75
3/4	0.8	63.5	4	90
1	0.8	70.0	4	90
1-1/4	0.8	79.5	4	95
1-1/2	0.8	90.5	4	100
2	0.8	108	6	100
2-1/2	0.8	127	6	115
3	0.8	146	6	120
3-1/2	0.8	159	6	125
4	0.8	175	6	125
5	0.8	210	6	135
6	0.8	241	6	140
8	0.8	302	6	150
10	0.8	356	6	170
12	0.8	413	6	185
14	0.8	457	6	190
16	0.8	508	6	205
18	0.8	575	6	210
20	1.5	635	6	220
22	1.5	686	6	255
24	1.5	749	6	255

*Table 300#-2, all dimensions are in mm.

RTJ Facings for ASME B16.5 Flanges in Classes
150#	300#	400#	600#
900#	1500#	2500#	-

*Click to view the RTJ facing dimensions for pressure rating Class 150 through Class 2500.

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