LAP JOINT FLANGE

Model NO.: LJF

Quantity:

Product Description

Lap Joint Flanges

Featuring a two-piece design, lap joint flanges require butt welding of the stub end to the pipe or fitting with the use of a backing flange to create the flanged connection. This design makes this style popular for use in systems with limited physical space or systems which require frequent dismantling and maintenance.

Size Range | 1/2″ – 36″ NPS (Larger sizes available upon request)
Classes | ASME/ANSI 150, 300, 600, 900, 1500, 2500
Stainless Steel Grades | 304, 304L, 316, 316L, 316L, 317L, 321 , 347 *
Special Alloys | 2205, 254SMo, Monel, Inconel *
Chrome Moly | P5, P9, P11, P22, P91 *
Standards | ASTM / ASME / ANSI

LAP JOINT CLASS 150 (IN INCH)

Lap joint flange dimensions class 150 in inches (ASME B16.5)

FLANGE NPS	Inside Diameter	Outside Diameter	Bolt Circle (BC)	H	T1	T2	RA	Bolt Hole (B)	No. of Bolt Holes
1/2″	0.88″	3.50″	2.38″	1.19″	.44″	.62″	.12″	.62″	4
3/4″	1.09″	3.88″	2.75″	1.50″	.50″	.62″	.12″	.62″	4
1″	1.36″	4.25″	3.12″	1.94″	.56″	.69″	.12″	.62″	4
1-1/4″	1.70″	4.62″	3.50″	2.31″	.62″	.81″	.19″	.62″	4
1-1/2″	1.97″	5.00″	3.88″	2.56″	.69″	.88″	.25″	.62″	4
2″	2.44″	6.00″	4.75″	3.06″	.75″	1.00″	.31″	.75″	4
2-1/2″	2.94″	7.00″	5.50″	3.56″	.88″	1.12″	.31″	.75″	4
3″	3.57″	7.50″	6.00″	4.25″	.94″	1.19″	.38″	.75″	4
3-1/2″	4.07″	8.50″	7.00″	4.81″	.94″	1.25″	.38″	.75″	8
4″	4.57″	9.00″	7.50″	5.31″	.94″	1.31″	.44″	.75″	8
5″	5.66″	10.00″	8.50″	6.44″	.94″	1.44″	.44″	.88″	8
6″	6.72″	11.00″	9.50″	7.56″	1.00″	1.56″	.50″	.88″	8
8″	8.72″	13.50″	11.75″	9.69″	1.12″	1.75″	.50″	.88″	8
10″	10.88″	16.00″	14.25″	12.00″	1.19″	1.94″	.50″	1.00″	12
12″	12.88″	19.00″	17.00″	14.38″	1.25″	2.19″	.50″	1.00″	12
14″	14.14″	21.00″	18.75″	15.75″	1.38″	3.12″	.50″	1.12″	12
16″	16.16″	23.50″	21.25″	18.00″	1.44″	3.44″	.50″	1.12″	16
18″	18.18″	25.00″	22.75″	19.88″	1.56″	3.81″	.50″	1.25″	16
20″	20.20″	27.50″	25.00″	22.00″	1.69″	4.06″	.50″	1.25″	20
22″	22.22″	29.50″	27.25″	24.25″	1.81″	4.25″	.50″	1.38″	20
24″	24.25″	32.00″	29.50″	26.12″	1.88″	4.38″	.50″	1.38″	20

LAP JOINT CLASS 300 (IN INCH)

Lap joint flange dimensions class 300 in inches (ASME B16.5)

FLANGE NPS	Inside Diameter	Outside Diameter	Bolt Circle (BC)	H	T1	T2	RA	Bolt Hole (B)	No. of Bolt Holes
1/2″	0.90″	3.75″	2.62″	1.50″	0.56″	0.88″	.12″	0.62″	4
3/4″	1.11″	4.62″	3.25″	1.88″	0.62″	1.00″	.12″	0.75″	4
1″	1.38″	4.88″	3.50″	2.12″	0.69″	1.06″	.12″	0.75″	4
1-1/4″	1.72″	5.25″	3.88″	2.50″	0.75″	1.06″	.19″	0.75″	4
1-1/2″	1.97″	6.12″	4.50″	2.75″	0.81″	1.19″	.25″	0.88″	4
2″	2.46″	6.50″	5.00″	3.31″	0.88″	1.31″	.31″	0.75″	8
2-1/2″	2.97″	7.50″	5.88″	3.94″	1.00″	1.50″	.31″	0.88″	8
3″	3.60″	8.25″	6.62″	4.62″	1.12″	1.69″	.38″	0.88″	8
3-1/2″	4.10″	9.00″	7.25″	5.25″	1.19″	1.75″	.38″	0.88″	8
4″	4.60″	10.00″	7.88″	5.75″	1.25″	1.88″	.44″	0.88″	8
5″	5.69″	11.00″	9.25″	7.00″	1.38″	2.00″	.44″	0.88″	8
6″	6.75″	12.50″	10.62″	8.12″	1.44″	2.06″	.50″	0.88″	12
8″	8.75″	15.00″	13.00″	10.25″	1.62″	2.44″	.50″	1.00″	12
10″	10.92″	17.50″	15.25″	12.62″	1.88″	3.75″	.50″	1.12″	16
12″	12.92″	20.50″	17.75″	14.75″	2.00″	4.00″	.50″	1.25″	16
14″	14.18″	23.00″	20.25″	16.75″	2.12″	4.38″	.50″	1.25″	20
16″	16.19″	25.50″	22.50″	19.00″	2.25″	4.75″	.50″	1.38″	20
18″	18.20″	28.00″	24.75″	21.00″	2.38″	5.12″	.50″	1.38″	24
20″	20.25″	30.50″	27.00″	23.12″	2.50″	5.50″	.50″	1.38″	24
22″	22.25″	33.00″	29.25″	25.25″	2.63″	5.75″	.50″	1.63″	24
24″	24.25″	36.00″	32.00″	27.62″	2.75″	6.00″	.50″	1.62″	24

LAP JOINT CLASS 400 (IN INCH)

Lap joint flange dimensions class 400 in inches (ASME B16.5)

FLANGE NPS	Inside Diameter	Outside Diameter	Bolt Circle (BC)	H	T1	T2	RA	Bolt Hole (B)	No. of Bolt Holes
1/2″	0.90″	3.75″	2.62″	1.50″	0.56″	0.88″	.12″	0.62″	4
3/4″	1.11″	4.62″	3.25″	1.88″	0.62″	1.00″	.12″	0.75″	4
1″	1.38″	4.88″	3.50″	2.12″	0.69″	1.06″	.12″	0.75″	4
1-1/4″	1.72″	5.25″	3.88″	2.50″	0.81″	1.12″	.19″	0.75″	4
1-1/2″	1.97″	6.12″	4.50″	2.75″	0.88″	1.25″	.25″	0.88″	4
2″	2.46″	6.50″	5.00″	3.31″	1.00″	1.44″	.31″	0.75″	8
2-1/2″	2.97″	7.50″	5.88″	3.94″	1.12″	1.62″	.31″	0.88″	8
3″	3.60″	8.25″	6.62″	4.62″	1.25″	1.81″	.38″	0.88″	8
3-1/2″	4.10″	9.00″	7.25″	5.25″	1.38″	1.94″	.38″	1.00″	8
4″	4.60″	10.00″	7.88″	5.75″	1.38″	2.00″	.44″	1.00″	8
5″	5.69″	11.00″	9.25″	7.00″	1.50″	2.12″	.44″	1.00″	8
6″	6.75″	12.50″	10.62″	8.12″	1.62″	2.25″	.50″	1.00″	12
8″	8.75″	15.00″	13.00″	10.25″	1.88″	2.69″	.50″	1.12″	12
10″	10.92″	17.50″	15.25″	12.62″	2.12″	4.00″	.50″	1.25″	16
12″	12.92″	20.50″	17.75″	14.75″	2.25″	4.25″	.50″	1.38″	16
14″	14.18″	23.00″	20.25″	16.75″	2.38″	4.62″	.50″	1.38″	20
16″	16.19″	25.50″	22.50″	19.00″	2.50″	5.00″	.50″	1.50″	20
18″	18.20″	28.00″	24.75″	21.00″	2.62″	5.38″	.50″	1.50″	24
20″	20.25″	30.50″	27.00″	23.12″	2.75″	5.75″	.50″	1.62″	24
22″	22.25″	33.00″	29.25″	25.25″	2.88″	6.00″	.50″	1.75″	24
24″	24.25″	36.00″	32.00″	27.62″	3.00″	6.25″	.50″	1.88″	24

LAP JOINT CLASS 600 (IN INCH)

Lap joint flange dimensions class 600 in inches (ASME B16.5)

FLANGE NPS	Inside Diameter	Outside Diameter	Bolt Circle (BC)	H	T1	T2	RA	Bolt Hole (B)	No. of Bolt Holes
1/2″	0.90″	3.75″	2.62″	1.50″	0.56″	0.88″	.12″	0.62″	4
3/4″	1.11″	4.62″	3.25″	1.88″	0.62″	1.00″	.12″	0.75″	4
1″	1.38″	4.88″	3.50″	2.12″	0.69″	1.06″	.12″	0.75″	4
1-1/4″	1.72″	5.25″	3.88″	2.50″	0.81″	1.12″	.19″	0.75″	4
1-1/2″	1.97″	6.12″	4.50″	2.75″	0.88″	1.25″	.25″	0.88″	4
2″	2.46″	6.50″	5.00″	3.31″	1.00″	1.44″	.31″	0.75″	8
2-1/2″	2.97″	7.50″	5.88″	3.94″	1.12″	1.62″	.31″	0.88″	8
3″	3.60″	8.25″	6.62″	4.62″	1.25″	1.81″	.38″	0.88″	8
3-1/2″	4.10″	9.00″	7.25″	5.25″	1.38″	1.94″	.38″	1.00″	8
4″	4.60″	10.75″	8.50″	6.00″	1.5″	2.12″	.44″	1.00″	8
5″	5.69″	13.00″	10.50″	7.44″	1.75″	2.38″	.44″	1.12″	8
6″	6.75″	14.00″	11.50″	8.75″	1.88″	2.62″	.50″	1.12″	12
8″	8.75″	16.50″	13.75″	10.75″	2.19″	3.00″	.50″	1.25″	12
10″	10.92″	20.00″	17.00″	13.5″	2.50″	4.38″	.50″	1.38″	16
12″	12.92″	22.00″	19.25″	15.75″	2.62″	4.62″	.50″	1.38″	20
14″	14.18″	23.75″	20.75″	17.00″	2.75″	5.00″	.50″	1.50″	20
16″	16.19″	27.00″	23.75″	19.50″	3.00″	5.50″	.50″	1.62″	20
18″	18.20″	29.25″	25.75″	21.50″	3.25″	6.00″	.50″	1.75″	20
20″	20.25″	32.00″	28.50″	24.00″	3.50″	6.50″	.50″	1.75″	24
22″	22.25″	34.25″	30.63″	26.25″	3.75″	6.88″	.50″	1.75″	24
24″	24.25″	37.00″	33.00″	28.25″	4.00″	7.25″	.50″	2.00″	24

LAP JOINT CLASS 900 (IN INCH)

Lap joint flange dimensions class 900 in inches (ASME B16.5)

FLANGE NPS	Inside Diameter	Outside Diameter	Bolt Circle (BC)	H	T1	T2	RA	Bolt Hole (B)	No. of Bolt Holes
3″	3.60″	9.50″	7.50″	5.00″	1.50″	2.13″	.38″	1.00″	8
4″	4.60″	11.50″	9.25″	6.25″	1.75″	2.75″	.44″	1.25″	8
5″	5.69″	13.75″	11.00″	7.50″	3.00″	3.13″	.44″	1.38″	8
6″	6.75″	15.00″	12.50″	9.25″	2.19″	3.38″	.50″	1.25″	12
8″	8.75″	18.50″	15.50″	11.75″	2.50″	4.50″	.50″	1.50″	12
10″	10.92″	21.50″	18.50″	14.50″	2.75″	5.00″	.50″	1.50″	16
12″	12.92″	24.00″	21.00″	16.50″	3.13″	5.63″	.50″	1.50″	20
14″	14.18″	25.25″	22.00″	17.75″	3.38″	6.13″	.50″	1.63″	20
16″	16.19″	27.75″	24.25″	20.00″	3.50″	6.50″	.50″	1.75″	20
18″	18.20″	31.00″	27.00″	22.25″	4.00″	7.50″	.50″	2.00″	20
20″	20.25″	33.75″	29.50″	24.50″	4.25″	8.25″	.50″	2.13″	20
24″	24.25″	41.00″	35.50″	29.50″	5.50″	10.50″	.50″	2.63″	20

LAP JOINT CLASS 1500 (IN INCH)

Lap joint flange dimensions class 1500 in inches (ASME B16.5)

FLANGE NPS	Inside Diameter	Outside Diameter	Bolt Circle (BC)	Raised Face (R)	Raised Face (RF)	H	Raised Face Thickness (T)	T1	Flat Face Thickness (T2)	Bolt Hole (B)	No. of Bolt Holes
1/2″	0.88″	4.75″	3.25″	1.38″	.250″	1.50″	1.50″	0.88″	1.25″	0.88″	4
3/4″	1.09″	5.13″	3.50″	1.69″	.250″	1.75″	1.63″	1.00″	1.38″	0.88″	4
1″	1.36″	5.88″	4.00″	2.00″	.250″	2.06″	1.88″	1.13″	1.63″	1.00″	4
1-1/4″	1.70″	6.25″	4.38″	2.50″	.250″	2.50″	1.88″	1.13″	1.63″	1.00″	4
1-1/2″	1.95″	7.00″	4.88″	2.88″	.250″	2.75″	2.00″	1.25″	1.75″	1.13″	4
2″	2.44″	8.50″	6.50″	3.63″	.250″	4.13″	2.50″	1.50″	2.25″	1.00″	8
2-1/2″	2.94″	9.63″	7.50″	4.13″	.250″	4.88″	2.75″	1.63″	2.50″	1.13″	8
3″ **	3.57″	10.50″	8.00″	5.00″	.250″	5.25″	3.13″	1.88″	2.88″	1.25″	8
4″ **	4.57″	12.25″	9.50″	6.19″	.250″	6.38″	3.81″	2.13″	3.56″	1.38″	8
5″ **	5.66″	14.75″	11.50″	7.31″	.250″	7.75″	4.38″	2.88″	4.13″	1.63″	8
6″ **	6.72″	15.50″	12.50″	8.50″	.250″	9.00″	4.94″	3.25″	4.69″	1.50″	12
8″ **	8.72″	19.00″	15.50″	10.63″	.250″	11.50″	5.88″	3.63″	5.63″	1.75″	12
10″ **	10.88″	23.00″	19.00″	12.75″	.250″	14.50″	6.50″	4.25″	6.25″	2.00″	12
12″ **	12.88″	26.50″	22.50″	15.00″	.250″	17.75″	7.38″	4.88″	7.13″	2.13″	16

LAP JOINT CLASS 2500 (IN INCH)

Lap joint flange dimensions class 2500 in inches (ASME B16.5)

FLANGE NPS	Inside Diameter	Outside Diameter	Bolt Circle (BC)	H	T1	T2	RA	Bolt Hole (B)	No. of Bolt Holes
1/2″	0.90″	5.25″	3.50″	1.69″	1.19″	1.56″	.12″	0.88″	4
3/4″	1.11″	5.50″	3.75″	2.00″	1.25″	1.69″	.12″	0.88″	4
1″	1.38″	6.25″	4.25″	2.25″	1.38″	1.88″	.12″	1.00″	4
1-1/4″	1.72″	7.25″	5.13″	2.88″	1.50″	2.06″	.19″	1.13″	4
1-1/2″	1.97″	8.00″	5.75″	3.13″	1.75″	2.38″	.25″	1.25″	4
2″	2.46″	9.25″	6.75″	3.75″	2.00″	2.75″	.31″	1.13″	8
2-1/2″	2.97″	10.50″	7.75″	4.50″	2.25″	3.13″	.31″	1.25″	8
3″	3.60″	12.00″	9.00″	5.25″	2.63″	3.63″	.38″	1.38″	8
4″	4.60″	14.00″	10.75″	6.50″	3.00″	4.25″	.44″	1.63″	8
5″	5.69″	16.50″	12.75″	8.00″	3.63″	5.13″	.44″	1.88″	8
6″	6.75″	19.00″	14.50″	9.25″	4.25″	6.00″	.50″	2.13″	8
8″	8.75″	21.75″	17.25″	12.00″	5.00″	7.00″	.50″	2.13″	12
10″	10.92″	26.50″	21.25″	14.75″	6.50″	9.00″	.50″	2.63″	12
12″	12.92″	30.00″	24.38″	17.38″	7.25″	10.00″	.50″	2.88″	12

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