Stainless Lap Joint Flanges & Dimensions

Size	Product Type	Pressure	Grade	Price	Quantity
1/2	Lap Joint	150#	304 Stainless Steel	$52.99	Max: Min: 1 Step: 1	View	Add to Cart
1/2	Lap Joint	150#	316 Stainless Steel	$74.15	Max: Min: 1 Step: 1	View	Add to Cart
1/2	Lap Joint	300#	304 Stainless Steel	$83.60	Max: Min: 1 Step: 1	View	Add to Cart
1/2	Lap Joint	300#	316 Stainless Steel	$114.16	Max: Min: 1 Step: 1	View	Add to Cart
3/4	Lap Joint	150#	304 Stainless Steel	$58.87	Max: Min: 1 Step: 1	View	Add to Cart
3/4	Lap Joint	300#	304 Stainless Steel	$83.60	Max: Min: 1 Step: 1	View	Add to Cart
3/4	Lap Joint	150#	316 Stainless Steel	$85.99	Max: Min: 1 Step: 1	View	Add to Cart
3/4	Lap Joint	300#	316 Stainless Steel	$114.16	Max: Min: 1 Step: 1	View	Add to Cart
1	Lap Joint	150#	304 Stainless Steel	$65.95	Max: Min: 1 Step: 1	View	Add to Cart
1	Lap Joint	300#	304 Stainless Steel	$83.60	Max: Min: 1 Step: 1	View	Add to Cart
1	Lap Joint	150#	316 Stainless Steel	$91.78	Max: Min: 1 Step: 1	View	Add to Cart
1	Lap Joint	300#	316 Stainless Steel	$114.16	Max: Min: 1 Step: 1	View	Add to Cart
1 1/4	Lap Joint	150#	304 Stainless Steel	$83.60	Max: Min: 1 Step: 1	View	Add to Cart
1 1/4	Lap Joint	150#	316 Stainless Steel	$122.38	Max: Min: 1 Step: 1	View	Add to Cart
1 1/4	Lap Joint	300#	304 Stainless Steel	$128.28	Max: Min: 1 Step: 1	View	Add to Cart
1 1/4	Lap Joint	300#	316 Stainless Steel	$187.16	Max: Min: 1 Step: 1	View	Add to Cart
1 1/2	Lap Joint	150#	304 Stainless Steel	$83.60	Max: Min: 1 Step: 1	View	Add to Cart
1 1/2	Lap Joint	150#	316 Stainless Steel	$122.38	Max: Min: 1 Step: 1	View	Add to Cart
1 1/2	Lap Joint	300#	304 Stainless Steel	$128.28	Max: Min: 1 Step: 1	View	Add to Cart
1 1/2	Lap Joint	300#	316 Stainless Steel	$187.16	Max: Min: 1 Step: 1	View	Add to Cart
2	Lap Joint	150#	304 Stainless Steel	$109.52	Max: Min: 1 Step: 1	View	Add to Cart
2	Lap Joint	150#	316 Stainless Steel	$151.85	Max: Min: 1 Step: 1	View	Add to Cart
2	Lap Joint	300#	304 Stainless Steel	$155.41	Max: Min: 1 Step: 1	View	Add to Cart
2	Lap Joint	300#	316 Stainless Steel	$207.15	Max: Min: 1 Step: 1	View	Add to Cart
2 1/2	Lap Joint	150#	304 Stainless Steel	$153.01	Max: Min: 1 Step: 1	View	Add to Cart

Product Info

We have an extensive inventory of stainless steel lap joint flanges to compliment our pipe products. Most of our high quality, flanges and gasket kits are ready to ship upon request. Speak to one of our specialists and find out which flange products are available to meet your flange and piping specifications. View an overview of our stainless steel product offerings.

Dimensions

The charts below list the dimensions, drilling and approximate weights of our Class 150 and Class 300 lap joint flanges. Full Class 150 and Class 300 charts for every raised face and lap joint flange type are on our stainless steel flanges page.

Dimensions in inches; weights are approximate, in pounds each.

Lap joint flanges have no raised face; their thickness Q is the same as in current ASME B16.5 tables.

Call us for stud and machine bolt lengths.

Class 150 lap joint flange: dimensions, drilling and approximate weight (inches)
Size	Flange OD	Thickness Q min.	Hub dia. at base X	Bore B3 min.	Corner radius r	Length through hub Y	Drilling and bolts				Approx. weight (lb)
Size	Flange OD	Thickness Q min.	Hub dia. at base X	Bore B3 min.	Corner radius r	Length through hub Y	Bolt circle dia.	No. of holes	Hole dia.	Bolt dia.	Approx. weight (lb)
1/2"	3.50	0.44	1.19	0.90	0.12	0.62	2.38	4	0.62	1/2	1.00
3/4"	3.88	0.50	1.50	1.11	0.12	0.62	2.75	4	0.62	1/2	1.50
1"	4.25	0.56	1.94	1.38	0.12	0.69	3.12	4	0.62	1/2	2.00
1-1/4"	4.62	0.62	2.31	1.72	0.19	0.81	3.50	4	0.62	1/2	3.00
1-1/2"	5.00	0.69	2.56	1.97	0.25	0.88	3.88	4	0.62	1/2	3.50
2"	6.00	0.75	3.06	2.46	0.31	1.00	4.75	4	0.75	5/8	5.00
2-1/2"	7.00	0.88	3.56	2.97	0.31	1.12	5.50	4	0.75	5/8	7.00
3"	7.50	0.94	4.25	3.60	0.38	1.19	6.00	4	0.75	5/8	9.25
3-1/2"	8.50	0.94	4.81	4.10	0.38	1.25	7.00	8	0.75	5/8	11.00
4"	9.00	0.94	5.31	4.60	0.44	1.31	7.50	8	0.75	5/8	12.50
5"	10.00	0.94	6.44	5.69	0.44	1.44	8.50	8	0.88	3/4	15.00
6"	11.00	1.00	7.56	6.75	0.50	1.56	9.50	8	0.88	3/4	19.00
8"	13.50	1.12	9.69	8.75	0.50	1.75	11.75	8	0.88	3/4	30.00
10"	16.00	1.19	12.00	10.92	0.50	1.94	14.25	12	1.00	7/8	43.00
12"	19.00	1.25	14.38	12.92	0.50	2.19	17.00	12	1.00	7/8	64.00
14"	21.00	1.38	15.75	14.18	0.50	3.12	18.75	12	1.12	1	105.00
16"	23.50	1.44	18.00	16.19	0.50	3.44	21.25	16	1.12	1	140.00
18"	25.00	1.56	19.88	18.20	0.50	3.81	22.75	16	1.25	1-1/8	160.00
20"	27.50	1.69	22.00	20.25	0.50	4.06	25.00	20	1.25	1-1/8	195.00
24"	32.00	1.88	26.12	24.25	0.50	4.38	29.50	20	1.38	1-1/4	275.00

Class 300 lap joint flange: dimensions, drilling and approximate weight (inches)
Size	Flange OD	Thickness Q min.	Hub dia. at base X	Bore B3 min.	Corner radius r	Length through hub Y	Drilling and bolts				Approx. weight (lb)
Size	Flange OD	Thickness Q min.	Hub dia. at base X	Bore B3 min.	Corner radius r	Length through hub Y	Bolt circle dia.	No. of holes	Hole dia.	Bolt dia.	Approx. weight (lb)
1/2"	3.75	0.56	1.50	0.90	0.12	0.88	2.62	4	0.62	1/2	2
3/4"	4.62	0.62	1.88	1.11	0.12	1.00	3.25	4	0.75	5/8	3
1"	4.88	0.69	2.12	1.38	0.12	1.06	3.50	4	0.75	5/8	3
1-1/4"	5.25	0.75	2.50	1.72	0.19	1.06	3.88	4	0.75	5/8	4
1-1/2"	6.12	0.81	2.75	1.97	0.25	1.19	4.50	4	0.88	3/4	6
2"	6.50	0.88	3.31	2.46	0.31	1.31	5.00	8	0.75	5/8	7
2-1/2"	7.50	1.00	3.94	2.97	0.31	1.50	5.88	8	0.88	3/4	10
3"	8.25	1.12	4.62	3.60	0.38	1.69	6.62	8	0.88	3/4	13
3-1/2"	9.00	1.19	5.25	4.10	0.38	1.75	7.25	8	0.88	3/4	17
4"	10.00	1.25	5.75	4.60	0.44	1.88	7.88	8	0.88	3/4	22
5"	11.00	1.38	7.00	5.69	0.44	2.00	9.25	8	0.88	3/4	28
6"	12.50	1.44	8.12	6.75	0.50	2.06	10.62	12	0.88	3/4	39
8"	15.00	1.62	10.25	8.75	0.50	2.44	13.00	12	1.00	7/8	58
10"	17.50	1.88	12.62	10.92	0.50	3.75	15.25	16	1.12	1	91
12"	20.50	2.00	14.75	12.92	0.50	4.00	17.75	16	1.25	1-1/8	140
14"	23.00	2.12	16.75	14.18	0.50	4.38	20.25	20	1.25	1-1/8	190
16"	25.50	2.25	19.00	16.19	0.50	4.75	22.50	20	1.38	1-1/4	250
18"	28.00	2.38	21.00	18.20	0.50	5.12	24.75	24	1.38	1-1/4	295
20"	30.50	2.50	23.12	20.25	0.50	5.50	27.00	24	1.38	1-1/4	370
24"	36.00	2.75	27.62	24.25	0.50	6.00	32.00	24	1.62	1-1/2	550

Standard Specifications

ANSI flanges meet ASTM-ASME A182 material specification and ASA B16.5 dimensional specification. View the standard specifications.

Stainless Steel Grades

Learn about our stainless steel inventory, functionality and application of our various grades of stainless steel.

Reference Catalog

We engineered our product Reference Catalog for you to easily identify all of our products. The catalog includes specification charts and general dimensional illustrations to help you identify available and needed products.

Additional Info

Stainless steel lap joint flanges don't have a raised face. The lap joint flange slips over the end of the pipe and bolted to it with a lap joint stub end. Some advantages of the lap joint flange is ease of application to the pipe system, and with the lack of contact with internal fluids of the pipe, the flange has an extra extended life.

Frequently Asked Questions

What sizes of lap joint flanges do you carry?

The product table on this page lists 304 and 316 stainless steel lap joint flanges from 1/2" to 24" in Class 150 and Class 300. For other sizes, classes or alloys, call (800) 282-9694 or send us a message.

What are the dimensions of a 4" Class 150 lap joint flange?

A 4" Class 150 lap joint flange is 9.00" OD, 0.94" thick and 1.31" long through the hub, with a minimum bore of 4.60" and eight 5/8" bolts on a 7.50" bolt circle. It weighs about 12.5 lb.

Do lap joint flanges have a raised face?

No. Lap joint flanges don't have a raised face; they are used with a lap joint stub end.

What specifications do your lap joint flanges meet?

Our ANSI flanges meet the ASTM-ASME A182 material specification and the ASA B16.5 dimensional specification.

How do I get a price?

Prices are listed in the product table on this page. If an item shows Quote, or you need a size or class that is not listed, call (800) 282-9694 or send us a message.

Stainless Steel Lap Joint Flanges