ASME/ANSI B16.5 Class 150 LJ

The lap joint flange is practically identical to a slip-on flange except it has a radius at the intersection of the bore and flange face. This radius is necessary to have the flange accommodate a lap joint stub end.

Normally, a lap joint flange and a lap joint stub end are mated together is an assembly system.

Nominal Pipe Size	Outside Diameter of Flange	Thickness of Lap Joint Min.	Diameter of Hub	Length Through Hub	Bore	Corner Radius of Bore of Lapped Flange	Diameter of Bolt Circle	Diameter of Bolt Holes	Number of Bolts	Approxi-mate Weight kgs
NPS	O	tf	X	Y	B	r	W	I	n
1/2	90	11.2	30	16	22.9	3	60.3	15.9	4	0.46
3/4	100	12.7	38	16	28.2	3	69.9	15.9	4	0.66
1	110	14.3	49	17	34.9	3	79.4	15.9	4	0.89
1 1/4	115	15.9	59	21	43.7	5	88.9	15.9	4	1.06
1 1/2	125	17.5	65	22	50.0	6	98.4	15.9	4	1.36
2	150	19.1	78	25	62.5	8	120.7	19.1	4	2.10
2 1/2	180	22.3	90	29	75.4	8	139.7	19.1	4	3.58
3	190	23.9	108	30	91.4	10	152.4	19.1	4	4.00
3 1/2	215	23.9	122	32	104.1	10	177.8	19.1	8	4.99
4	230	23.9	135	33	116.8	11	190.5	19.1	8	5.62
5	255	23.9	164	36	144.4	11	215.9	22.2	8	6.38
6	280	25.4	192	40	171.4	13	241.3	22.2	8	7.74
8	345	28.6	246	44	222.2	13	298.5	22.2	8	12.65
10	405	30.2	305	49	277.4	13	362.0	25.4	12	16.65
12	485	31.8	365	56	328.2	13	431.8	25.4	12	27.31
14	535	35.0	400	79	360.2	13	476.3	28.6	12	39.89
16	595	36.6	457	87	411.2	13	539.8	28.6	16	51.18
18	635	39.7	505	97	462.3	13	577.9	31.8	16	57.07
20	700	42.9	559	103	514.4	13	635.0	31.8	20	72.08
24	815	47.7	663	111	616.0	13	749.3	34.9	20	100.11