Lap Joint Flanges | ASME B16.5 | With Stub Ends

Home Lap Joint Flange

PM Industries manufactures, supplies, and stocks Lap Joint Flanges in a range of materials, pressure ratings, and pipe sizes. A lap joint flange assembly consists of two components: a stub end, which is butt-welded to the pipe, and a backing flange, which slides over the pipe and bears against the back of the stub end at the joint face. The backing flange is not welded to the pipe and is not in contact with the process fluid. It's free to rotate around the stub end at any time before the bolts are tightened.

That free rotation is the functional advantage the design provides. Getting bolt holes aligned between two flanges in a field piping installation, particularly on large-diameter pipe, heavy spools, or in confined spaces, is time-consuming when every component is fixed. With lap joint flanges, both backing flanges rotate freely until the bolts are inserted, which makes alignment fast regardless of how the spool arrived at the job site.

Material cost management is a practical benefit that gets lap joint flanges specified in corrosion-resistant piping systems. In an all-stainless piping system, every flange is stainless. With lap joint flanges, only the stub end, which contacts the process fluid, needs to be stainless or the specified alloy. The backing flange, which provides the structural connection and bears the bolt load, can be carbon steel. On large-diameter systems with many flange connections, that difference in material cost across the backing flange population is significant.

The same principle applies to high-alloy piping. In nickel alloy piping systems where Inconel 625 or Hastelloy C-276 is required for corrosion resistance, using lap joint flanges with carbon steel backing flanges keeps the quantity of expensive alloy material limited to the stub ends, which are the actual wetted components.

Frequent dismantling service suits lap joint flanges well. In food processing, pharmaceutical, and chemical process systems where piping sections are cleaned frequently, removed for maintenance, or modified regularly, the ability to rotate the backing flanges for alignment on reassembly speeds maintenance significantly compared to fixed-face flanges where bolt holes must be exactly aligned before the spool can be reconnected.

Lap joint flanges are available with full material certification to ASTM, ASME, and applicable specifications. Stub ends supplied to ASME B16.9 and backing flanges to ASME B16.5. Contact PM Industries for material selection, stub end type (short or long pattern), pressure class, and pricing.

Specification Lap Joint Flange

Standards	ANSI/ASME B16.5, B16.48, GOST, DIN, EN-1092, B16.47 Series A & B, AWWA, BS Flanges
JIS Standard	5K, 10K, 16K, 20K, 30K, 40K, 63K
DIN Flanges	DIN 2527, 2627, 2631, 2656, 2576, 2673, 2629, 2628, 2566

Flanges are Available in Following Materials

Stainless Steel	SS 201, SS 202, SS 301, SS 304, SS 304L, SS 310, SS 310S, SS 316L, SS 316TI, SS 317, SS 317L, SS 321, SS 347, SS 409, SS 409M, SS 409L, SS 410, SS 410S, SS 420, SS 430, SS 431, SS 441, SS 444, SS 446, SS 17-4PH, SS 904L.
Duplex Steel	UNS S32205, UNS S31803 Flange
Super Duplex Steel	UNS S32750, UNS S32760 Flanges
Carbon Steel	Carbon steel A105 Flanges, A36 Flanges, IS 2062 Flanges, A350 LF2 Flanges, F42 Flanges, F52 Flanges, F56 Flanges, F60 Flanges, F65 Flanges, F70 Flanges, F80 Flanges, IBR flanges, A694 Flanges, SS400, SF440, ST37-2 Flanges, S235JrG2 Flanges, P250GH Flanges, C22.8 Flanges, etc.
Alloys Steel	Alloy 20, F1, F5, F9, F11, F22, F91 Flanges
Copper Alloys	Cu-Ni 70/30, Cu-Ni 90/10, C 24000, C 75700, C 51100, C 22000, C 27200, C 21000, C 26800, C 52100, C 77000, C 52000, C 11000, C 74500, C 23000, C 28000, C 12200, C 76400, C 51900, C 75400, C 26000, C 51000, C 10200, C 27000
Nickel Alloys	Nickel 200, 201
Inconel	Inconel 600, 601, 625, 718, 800, 825, X-750
Monel	Monel 400, k500
Hastelloy	Hastelloy C-22, C-276, C-4, X
Titanium	Grade 1, 4, 5(Ti 6Al-4V), 6(Ti 5Al-2.5Sn), 7, 11, 6Al-2Sn-4Zr-2Mo, Grade 12, 6Al-6V-25n, Grade 23(Ti 6AL-4V ELI), 8Ai-1Mo-1V, Grade 5 ELI, Grade 9(3Al-2.5V), 6Al-7Nb.
Aluminium	6063, 1100, 6082 A96082, 1050, 2017, 2024 A92024, 7050 A97050, 5083 A95083, 2014A A92014, 2011 A92011, 6061 A96061 A86061, 5754, 7085, 2050, 7071 7020, 7178, 5052 A95052, 7150, 7075 A97075 A87075, 7575, 2219, 7175
Pressure Rating	Class 150 LBS, 300 LBS, 600 LBS, 900 LBS, 1500 LBS, 2500 LBS
Types	Threaded, Plate, Screwed, Forged.
Supporting material	Gasket, Ring Joint, Flange Bolts
Size range	1/2" (15 NB) to 48" (1200NB) DN10~DN5000
High Temperature	Above 200°C (400°F) For Class 150 Or Above 400°C (750°F)
Low Temperature	Above -29 Degree C (−20°F)
Production technique	Forged, machined and Heat treated
Custom design	As per your drawing
Origin	Indian / USA / Korean / West Europe / Japan
Pressure Class	PN 6 TO PN 100
Coating/Surface Treatment:	Zinc Plated, Anti-rust Paint, Oil Black Paint, Yellow Transparent, Cold and Hot Dip Galvanized.
European/African/Russian Standard Flanges	Available
Test	Direct-reading Spectrograph, X-ray detector, UItrasonic flaw detector, Magnetic particle detector, Hydrostatic testing machine.
Marking Standard	Name of Manufacturer
	Schedule
	Type of Flange Facing
	Pressure Class
	Nominal Pipe Size, etc
Test Certificates	EN 10204/3.1B, NACE MR0103, NACE MR0175
	Raw Materials Certificate
	100% Radiography Test Report
	Third Party Inspection Report, etc

150 Lb Lap Joint Flange Dimensions

Size in Inch	Size in MM	Outer Diameter	Flange Thickness	Lapped Thickness	Lapped Inner Diameter	PCD	Lapped Thickness	Lapped Radius	No of Bolts	Bolt Size UNC	Machine Bolt Length	RF Stud Length	Hole Size	ISO Stud Size	Weight in kg
		A	B	C	D	E	G
3/4	20	100	38	16	28.2	69.9	12.7	3	4	1/2	50	65	5/8	M14	0.9
2 1/2	65	180	90	29	75.4	139.7	22.3	8	4	5/8	75	90	3/4	M16	3.2
1	25	110	49	17	34.9	79.4	14.3	3	4	1/2	55	65	5/8	M14	0.9
1 1/4	32	115	59	21	43.7	88.9	15.9	5	4	1/2	55	70	5/8	M14	1.4
1/2	15	90	30	16	22.9	60.3	11.2	3	4	1/2	50	55	5/8	M14	0.8
1 1/2	40	125	65	22	50	98.4	17.5	6	4	1/2	65	70	5/8	M14	1.4
2	50	150	78	25	62.5	120.7	19.1	8	4	5/8	70	85	3/4	M16	2.3
3	80	190	108	30	91.4	152.4	23.9	10	4	5/8	75	90	3/4	M16	3.7
3 1/2	90	215	122	32	104.1	177.8	23.9	11	8	5/8	75	90	3/4	M16	5
4	100	230	135	33	116.8	190.5	23.9	11	8	5/8	75	90	3/4	M16	5.9
5	125	255	164	36	144.4	215.9	23.9	11	8	3/4	85	95	7/8	M20	6.8
14	350	535	400	79	360.2	476.3	35	13	12	1	115	135	1 1/8	M27	41
6	150	280	192	40	171.4	241.3	25.4	13	8	3/4	85	100	7/8	M20	8.6
8	200	345	246	44	222.2	298.5	28.6	13	8	3/4	90	110	7/8	M20	13.7
10	250	405	305	49	277.4	362	30.2	13	12	7/8	100	115	1	M24	19.5
12	300	485	365	56	328.2	431.8	31.8	13	12	7/8	100	120	1	M24	29
16	400	595	457	87	411.2	539.8	36.6	13	16	1	115	135	1 1/8	M27	54
18	450	635	505	97	462.3	577.9	39.7	13	16	1 1/8	125	145	1 1/4	M30	59
24	600	815	663	111	616	749.3	47.9	13	20	1 1/4	150	170	1 3/8	M33	100
20	500	700	559	103	514.4	635	42.9	13	20	1 1/8	140	160	1 1/4	M30	75

300# Loose Flange Dimensions

Size in Inch	Size in MM	Outer Diameter	Flange Thickness	Lapped Thickness	Lapped Inner diameter	PCD	Lapped Thickness	Lapped Radius	No of Bolts	Bolt Size UNC	Machine Bolt Length	RF Stud Length	Hole Size	ISO Stud Size	Weight in kg
		A	B	C	D	E	G
2	50	165	84	33	62.5	127	22.3	8	8	5/8	75	90	3/4	M16	3.2
3/4	20	115	48	25	28.2	82.6	15.9	3	4	5/8	65	75	3/4	M16	1.4
1	25	125	54	27	34.9	88.9	17.5	3	4	5/8	65	75	3/4	M16	1.4
1 1/4	32	135	64	27	43.7	98.4	19.1	5	4	5/8	70	85	3/4	M16	1.8
1 1/2	40	155	70	30	50	114.3	20.7	6	4	3/4	75	90	7/8	M20	2.7
2 1/2	65	190	100	38	75.4	149.2	25.4	8	8	3/4	85	100	7/8	M20	4.6
3	80	210	117	43	91.4	168.3	28.6	10	8	3/4	90	110	7/8	M20	5.9
8	200	380	260	62	222.2	330.2	41.3	13	12	7/8	120	140	1	M24	26
1/2	15	95	38	22	22.9	66.7	14.3	3	4	1/2	55	65	5/8	M14	1.2
3 1/2	90	230	133	44	104.1	184.2	30.2	11	8	3/4	95	110	7/8	M20	7.7
4	100	255	146	48	116.8	200	31.8	11	8	3/4	95	115	7/8	M20	10
5	125	280	178	51	144.4	235	35	11	8	3/4	110	120	7/8	M20	12.7
6	150	320	206	52	171.4	269.9	36.6	13	12	3/4	110	120	7/8	M20	17.7
24	600	915	702	153	616	812.8	69.9	13	24	1 1/2	205	230	1 5/8	M39	216
10	250	445	321	95	277.4	387.4	47.7	13	16	1	140	160	1 1/8	M27	36
12	300	520	375	102	328.2	450.8	50.8	13	16	1 1/8	145	170	1 1/4	M30	52
14	350	585	425	111	360.2	514.4	54	13	20	1 1/8	160	180	1 1/4	M30	75
16	400	650	483	121	411.2	571.5	57.2	13	20	1 1/4	165	190	1 3/8	M33	86
18	450	710	533	130	462.3	628.6	60.4	13	24	1 1/4	170	195	1 3/8	M33	113
20	500	775	587	140	514.4	685.8	63.5	13	24	1 1/4	185	205	1 3/8	M33	143

Lap Joint Class 400 Blind Flange Dimension table

Size in Inch	Size in MM	Outer Diameter	Flange Thickness	Lapped Thickness	Lapped Inner Diameter	PCD	Lapped Thickness	Lapped Radius	No of Bolts	Bolt Size UNC	RF Stud Length	Hole Size	ISO Stud Size	Weight in kg
		A	B	C	D	E	G
3/4	20	115	48	25	28.2	82.6	15.9	3	4	5/8	90	3/4	M16	1.5
1/2	15	95	38	22	22.9	66.7	14.3	3	4	1/2	75	5/8	M14	1.3
1	25	125	54	27	34.9	88.9	17.5	3	4	5/8	90	3/4	M16	1.8
1 1/4	32	135	64	29	43.7	98.4	20.7	5	4	5/8	95	3/4	M16	2.3
1 1/2	40	155	70	32	50	114.3	22.3	6	4	3/4	110	7/8	M20	3.2
2	50	165	84	37	62.5	127	25.4	8	8	5/8	110	3/4	M16	4.1
2 1/2	65	190	100	41	75.4	149.2	28.6	8	8	3/4	120	7/8	M20	5.9
6	150	320	206	57	171.4	269.9	41.3	13	12	7/8	150	1	M24	20
3	80	210	117	46	91.4	168.3	31.8	10	8	3/4	125	7/8	M20	7.3
3 1/2	90	230	133	49	104.1	184.2	35	10	8	7/8	140	1	M24	9.6
4	100	255	146	51	116.8	200	35	11	8	7/8	140	1	M24	11.8
5	125	280	178	54	144.5	235	38.1	11	8	7/8	145	1	M24	14.1
24	600	915	702	159	616	812.8	76.2	13	24	1 3/4	265	1 7/8	M45	232
8	200	380	260	68	222.2	330	47.7	13	12	1	170	1 1/8	M27	31
10	250	445	321	102	277.4	387.4	54	13	16	1 1/8	190	1 1/4	M30	42
12	300	520	375	108	328.2	450.8	57.2	13	16	1 1/4	205	1 3/8	M33	59
14	350	585	425	117	360.2	514.4	60.4	13	20	1 1/4	210	1 3/8	M33	82
16	400	650	483	127	411.2	571.5	63.5	13	20	1 3/8	220	1 1/2	M36	107
18	450	710	533	137	462.3	628.6	66.7	13	24	1 3/8	230	1 1/2	M36	130
20	500	775	587	146	514.4	685.8	69.9	13	24	1 1/2	240	1 3/4	M39	157

Lap Joint Flange Dimensions Class 600

Size in Inch	Size in MM	Outer Diameter	Flange Thickness	Lapped Thickness	Lapped Inner Diameter	PCD	Lapped Thickness	Lapped Radius	No of Bolts	Bolt Size UNC	RF Stud Length	Hole Size	ISO Stud Size	Weight in kg
		A	B	C	D	E	G
3/4	20	115	48	25	28.2	82.6	15.9	3	4	5/8	90	3/4	M16	1.4
1	25	125	54	27	34.9	88.9	17.5	3	4	5/8	90	3/4	M16	1.8
1 1/4	32	135	64	29	43.7	98.4	20.7	5	4	5/8	95	3/4	M16	2.3
8	200	420	273	76	222.2	349.2	55.6	13	12	1 1/8	190	1 1/4	M30	52
1 1/2	40	155	70	32	50	114.3	22.3	6	4	3/4	110	7/8	M20	3.2
2	50	165	84	37	62.5	127	25.4	8	8	5/8	110	3/4	M16	4.1
2 1/2	65	190	100	41	75.4	149.2	28.6	8	8	3/4	120	7/8	M20	5.9
3	80	210	117	46	91.4	168.3	31.8	10	8	3/4	125	7/8	M20	7.3
3 1/2	90	230	133	49	104.1	184.2	35	11	8	7/8	140	1	M24	9.6
4	100	275	152	54	116.8	215.9	38.1	11	8	7/8	145	1	M24	16.8
5	125	330	189	60	144.4	266.7	44.5	11	8	1	165	1 1/8	M27	29
24	600	940	718	184	616	838.2	101.6	13	24	1 7/8	330	2	M48	332
6	150	355	222	67	171.4	292.1	47.7	13	12	1	170	1 1/8	M27	36
1/2	15	95	38	22	22.9	66.7	14.3	3	4	1/2	75	5/8	M14	1.3
10	250	510	343	111	277.4	431.8	63.5	13	16	1 1/4	215	1 3/8	M33	77
12	300	560	400	117	328.2	489	66.7	13	20	1 1/4	220	1 3/8	M33	91
14	350	605	432	127	360.2	527	69.9	13	20	1 3/8	235	1 1/2	M36	105
16	400	685	495	140	411.2	603.2	76.2	13	20	1 1/2	255	1 5/8	M39	150
18	450	745	546	152	462.3	654	82.6	13	20	1 5/8	275	1 3/4	M42	182
20	500	815	610	165	514.4	723.9	88.9	13	24	1 5/8	285	1 3/4	M42	232

Class 900 Lap Joint Flange Dimensions In Mm

Size in Inch	Size in MM	Outer Diameter	Flange Thickness	Lapped Thickness	Lapped Inner Diameter	PCD	Lapped Thickness	Lapped Radius	No of Bolts	Bolt Size UNC	RF Stud Length	Hole Size	ISO Stud Size	Weight in kg
		A	B	C	D	E	G
3/4	20	130	44	35	28.2	88.9	25.4	3	4	3/4	115	7/8	M20	2.3
1	25	150	52	41	34.9	101.6	28.6	3	4	7/8	125	1	M24	3.6
24	600	1040	749	267	616	901.7	139.7	13	20	2 1/2	440	2 5/8	M64	608
1 1/4	32	160	64	41	43.7	111.1	28.6	5	4	7/8	125	1	M24	4.1
1 1/2	40	180	70	44	50	123.8	31.8	6	4	1	140	1 1/8	M27	5.5
2	50	215	105	57	62.5	165.1	38.1	8	8	7/8	145	1	M24	11.5
2 1/2	65	245	124	64	75.4	190.5	41.3	8	8	1	160	1 1/8	M27	16.5
3	80	240	127	54	91.4	190.5	38.1	10	8	7/8	145	1	M24	12
4	100	290	159	70	116.8	235	44.5	11	8	1 1/8	170	1 1/4	M30	24
5	125	350	190	79	144.4	279.4	50.8	11	8	1 1/4	190	1 3/8	M33	38
1/2	15	120	38	32	22.9	82.6	22.3	3	4	3/4	110	7/8	M20	1.8
6	150	380	235	86	171.4	317.5	55.6	13	12	1 1/8	190	1 1/4	M30	50
8	200	470	298	114	222.2	393.7	63.5	13	12	1 3/8	220	1 1/2	M36	78
10	250	545	368	127	277.4	469.9	69.9	13	16	1 3/8	235	1 1/2	M36	112
14	350	640	451	156	360.2	558.8	85.8	13	20	1 1/2	275	1 5/8	M39	182
16	400	705	508	165	411.2	616	88.9	13	20	1 5/8	285	1 3/4	M42	193
18	450	785	565	190	462.3	685.8	101.6	13	20	1 7/8	325	2	M48	258
20	500	855	622	210	514.4	749.3	108	13	20	2	350	2 1/8	M52	317
12	300	610	419	143	328.2	533.4	79.4	13	20	1 3/8	255	1 1/2	M36	148

SS Loose Flange Dimensions 1500

Size in Inch	Size in mm	Outer Diameter	Flange Thickness	Lapped Thickness	Lapped Inner Diameter	PCD	Lapped Thickness	Lapped Radius	No of Bolts	Bolt Size UNC	RF Stud Length	Hole Size	ISO Stud Size	Weight in kg
		A	B	C	D	E	G
14	350	750	495	241	360.2	635	133.4	13	16	2 1/4	405	2 3/8	M56	341
1/2	15	120	38	32	22.9	82.6	22.3	3	4	3/4	110	7/8	M20	1.8
1	25	150	52	41	34.9	101.6	28.6	3	4	7/8	125	1	M24	3.7
1 1/4	32	160	64	41	43.7	111.1	28.6	5	4	7/8	125	1	M24	4.1
1 1/2	40	180	70	44	50	123.8	31.8	6	4	1	140	1 1/8	M27	5.5
2	50	215	105	57	62.5	165.1	38.1	8	8	7/8	145	1	M24	9.8
2 1/2	65	245	124	64	75.4	190.5	41.3	8	8	1	160	1 1/8	M27	16.4
3/4	20	130	44	35	28.2	88.9	25.4	3	4	3/4	115	7/8	M20	2.3
3	80	265	133	73	91.4	203.2	47.7	10	8	1 1/8	180	1 1/4	M30	21.8
4	100	310	162	90	116.8	241.3	54	11	8	1 1/4	195	1 3/8	M33	33
5	125	375	197	105	144.4	292.1	73.1	11	8	1 1/2	250	1 5/8	M39	59
6	150	395	229	119	171.4	317.5	82.6	13	12	1 3/8	260	1 1/2	M36	75
20	500	985	641	292	514.4	831.8	177.8	13	16	3	540	3 1/8	M76	792
10	250	585	368	178	277.4	482.6	108	13	12	1 7/8	335	2	M48	198
12	300	675	451	219	328.2	571.5	123.9	13	16	2	375	2 1/8	M52	264
16	400	825	552	260	411.2	704.8	146.1	13	16	2 1/2	445	2 5/8	M64	454
24	600	1170	762	330	616	990.6	203.2	13	16	3 1/2	615	3 5/8	M90	1248
18	450	915	597	276	462.3	774.7	162	13	16	2 3/4	495	2 7/8	M72	590
8	200	485	292	143	222.2	393.7	92.1	13	12	1 5/8	290	1 3/4	M42	118

Ss Lap Joint Flange #2500 Dimensions Schedule

Size in Inch	Size in MM	Outer Diameter	Flange Thickness	Lapped Thickness	Lapped ID	PCD	Lapped Thickness	Lapped Radius	No of Bolts	Bolt Size UNC	RF Stud Length	Hole Size	ISO Stud Size	Weight in kg
		A	B	C	D	E	G
12	300	760	441	254	328.2	619.1	184.2	13	12	2 3/4	540	2 7/8	M72	500
1/2	15	135	43	40	22.9	88.9	30.2	3	4	3/4	120	7/8	M20	3.2
3/4	20	140	51	43	28.2	95.2	31.8	3	4	3/4	125	7/8	M20	3.7
1	25	160	57	48	34.9	108	35	3	4	7/8	140	1	M24	5
1 1/4	32	185	73	52	43.7	130.2	38.1	5	4	1	150	1 1/8	M27	7.5
1 1/2	40	205	79	60	50	146	44.5	6	4	1 1/8	170	1 1/4	M30	10
2	50	235	95	70	62.5	171.4	50.9	8	8	1	180	1 1/8	M27	17.5
2 1/2	65	265	114	79	75.4	196.8	57.2	8	8	1 1/8	195	1 1/4	M30	23
3	80	305	133	92	91.4	228.6	66.7	10	8	1 1/4	220	1 3/8	M33	37.8
4	100	355	165	108	116.8	273	76.2	11	8	1 1/2	255	1 5/8	M39	57
5	125	420	203	130	144.4	323.8	92.1	11	8	1 3/4	300	1 7/8	M45	95
6	150	485	235	152	171.4	368.3	108	13	8	2	345	2 1/8	M52	148
8	200	550	305	178	222.2	438.2	127	13	12	2	380	2 1/8	M52	221
10	250	675	375	229	277.4	539.8	165.1	13	12	2 1/2	490	2 5/8	M64	425

Stainless Steel Lap Joint Flange Pressure Rating

Temperature (F°)	150#	300#	400#	600#	900#	1500#	2500#
200	260	680	905	1360	2035	3395	5655
300	230	655	870	1310	1965	3270	5450
400	200	635	845	1265	1900	3170	5280
500	170	605	805	1205	1810	3015	5025
600	140	570	755	1135	1705	2840	4730
-20 to 100	285	740	985	1480	2220	3705	6170
950	35	135	185	275	410	685	1145
650	125	550	730	1100	1650	2745	4575
700	110	530	710	1060	1590	2655	4425
750	95	505	675	1015	1520	2535	4230
800	80	410	550	825	1235	2055	3430
900	50	230	305	460	690	1150	1915
1000	20	85	115	170	255	430	715
850	65	320	425	640	955	1595	2655

Stainless Steel Loose Flange Gasket Dimensions

Nominal Pipe Size	Gasket Inner diameter	Gasket Outer Diameter
Nominal Pipe Size	Gasket Inner diameter	Class 150 LBS	Class 300 LBS	Class 400 LBS	Class 600 LBS	Class 900 LBS
10	10.75	13.375	14.25	14.125	15.75	17.125
1/2	0.84	1.875	2.125	2.125	2.125	2.50
3/4	1.06	2.25	2.625	2.625	2.625	2.75
1	1.31	2.625	2.875	2.875	2.875	3.125
1 1/4	1.66	3	3.25	3.25	3.25	3.50
1 1/2	1.91	3.375	3.75	3.75	3.75	3.875
2	2.38	4.125	4.375	4.375	4.375	5.625
2 1/2	2.88	4.875	5.125	5.125	5.125	6.50
3	3.50	5.375	5.875	5.875	5.875	6.625
4	4.50	6.875	7.125	7.00	7.625	8.125
6	6.62	8.75	9.875	9.75	10.50	11.375
8	8.62	11	12.125	12.00	12.625	14.125
12	12.75	16.125	16.625	16.50	18.00	19.625
5	5.56	7.75	8.50	8.375	9.50	9.75

Lap Joint Flange Bolt Length

	Class 150 LBS				Class 300 LBS				Class 600 LBS
Nominal Ppe Size	Bolts And Studs	Diameter of Bolts And Studs	Stud Length		Bolts And Studs	Diameter of Bolts And Studs	Stud Length		Bolts And Studs	Diameter of Bolts And Studs	Stud Length
			1/16 RF	RTJ			1/16 RF	RTJ			1/4 RF	RTJ
3/4	4	0.50	2-1/2	–	4	0.63	3	3-1/2	4	0.63	3-1/2	3-1/2
1/2	4	0.50	2-1/4	–	4	0.50	2-1/2	3	4	0.50	3	3
1	4	0.50	2-1/2	3	4	0.63	3	3-1/2	4	0.63	3-1/2	3-1/2
5	8	0.75	3-3/4	4-1/4	8	0.75	4-3/4	5-1/4	8	1.00	6-1/2	6-1/2
1-1/4	4	0.50	2-3/4	3-1/4	4	0.63	3-1/4	3-3/4	4	0.63	3-3/4	3-3/4
1-1/2	4	0.50	2-3/4	3-1/4	4	0.75	3-1/2	4	4	0.75	4-1/4	4-1/4
2	4	0.63	3-1/4	3-3/4	8	0.63	3-1/2	4	8	0.63	4-1/4	4-1/4
2-1/2	4	0.63	3-1/2	4	8	0.75	4	4-1/2	8	0.75	4-3/4	4-3/4
3	4	0.63	3-1/2	4	8	0.75	4-1/4	4-3/4	8	0.75	5	5
3-1/2	8	0.63	3-1/2	4	8	0.75	4-1/4	5	8	0.88	5-1/2	5-1/2
4	8	0.63	3-1/2	4	8	0.75	4-1/2	5	8	0.88	5-3/4	5-3/4
6	8	0.75	4	4-1/2	12	0.75	4-3/4	5-1/2	12	1.00	6-3/4	6-3/4
12	12	0.88	4-3/4	5-1/4	16	1.13	6-3/4	7-1/4	20	1.25	8-3/4	8-3/4
8	8	0.75	4-1/4	4-3/4	12	0.88	5-1/2	6	12	1.13	7-1/2	7-3/4
10	12	0.88	4-1/2	5	16	1.00	6-1/4	6-3/4	16	1.25	8-1/2	8-1/2
24	20	1.25	6-3/4	7-1/4	24	1.50	9	10	24	1.88	13	13-1/4
14	12	1.00	5-1/4	5-3/4	20	1.13	7	7-1/2	20	1.38	9-1/4	9-1/4
16	16	1.00	5-1/4	5-3/4	20	1.25	7-1/2	8	20	1.50	10	10
18	16	1.13	5-3/4	6-1/4	24	1.25	7-3/4	8-1/4	20	1.63	10-3/4	10-3/4
20	20	1.13	6-1/4	6-3/4	24	1.25	8	8-3/4	24	1.63	11-1/4	11-1/2

Lap Joint Flange Sizes

DN In inches	Dimension	A Lap Joint Flange Dimensional Sizes 1/2" to 2 1/2"
		125 LBS 150 LBS		300 LBS		400 LBS		600 LBS		900 LBS		1500 LBS		2500 LBS
		inches	MM	inches	MM	inches	MM	inches	MM	inches	MM	inches	MM	inches	MM
1/2	A	3 1/2	88.9	3 3/4	95.2	3 3/4	95.2	3 3/4	95.2	4 3/4	121	4 3/4	121	5 1/4	133.4
	b	7/16	11.1	9/16	14.3	9/16	14.3	9/16	14.3	7/8	22.2	7/8	22.2	1 3/16	30.2
	D2	1 3/8	34.9	1 3/8	34.9	1 3/8	34.9	1 3/8	34.9	1 3/8	34.9	1 3/8	34.9	1 3/8	34.9
	D1	2 3/8	60.3	2 5/8	66.7	2 5/8	66.7	2 5/8	66.7	3 1/4	82.6	3 1/4	82.6	3 1/2	88.9
	n	4	4	4	4	4	4	4	4	4	4	4	-	4	44
	d	5/8	15.9	5/8	15.9	5/8	15.9	5/8	15.9	7/8	22.2	7/8	22.2	7/8	22.2
3/4	A	3 7/8	98.4	4 5/8	117.5	4 5/8	117.5	4 5/8	117.5	5 1/8	130	5 1/8	130	5 1/2	139.7
	b	1/2	12.7	5/8	15.9	5/8	15.9	5/8	15.9	1	25.4	1	25.4	1 1/4	31.8
	D2	1 11/16	42.9	1 11/16	42.9	1 11/16	42.9	1 11/16	42.9	1 11/16	42.9	1 11/16	42.9	1 11/16	42.9
	D1	2 3/4	69.8	3 1/4	82.5	3 1/4	82.5	3 1/4	82.5	3 1/2	88.9	3 1/2	88.9	3 3/4	95.2
	n	4	4	4	4	4	4	4	4	4	4	4	-	4	44
	d	5/8	15.9	3/4	19	3/4	19	3/4	19	7/8	22.2	7/8	22.2	7/8	22.2
1	A	4 1/4	108	4 7/8	123.8	4 7/8	123.8	4 7/8	123.8	5 7/8	149.2	5 7/8	149.2	6 1/4	159
	b	9/16	14.3	11/16	17.5	11/16	17.5	11/16	17.5	1 1/8	28.6	1 1/8	28.6	1 3/8	34.9
	D2	2	50.8	2	50.8	2	50.8	2	50.8	2	50.8	2	50.8	2	50.8
	D1	3 1/8	79.4	3 1/2	88.9	3 1/2	88.9	3 1/2	88.9	4	102	4	102	4 1/4	108
	n	4	4	4	4	4	4	4	4	4	4	4	4	4	4
	d	5/8	15.9	3/4	19	3/4	19	3/4	19	1	25.4	1	25.4	1	25.4
1 1/4	A	4 5/8	117.5	5 1/4	133.4	5 1/4	133.4	5 1/4	133.4	6 1/4	159	6 1/4	159	7 1/4	184.2
	b	5/8	15.9	3/4	19	13/16	20.6	13/16	20.6	1 1/8	28.6	1 1/8	28.6	1 1/2	38.1
	D2	2 1/2	63.5	2 1/2	63.5	2 1/2	63.5	2 1/2	63.5	2 1/2	63.5	2 1/2	63.5	2 1/2	63.5
	D1	3 1/2	88.9	3 7/8	98.4	3 7/8	98.4	3 7/8	98.4	4 3/8	111	4 3/8	111	5 1/8	130
	n	4	4	4	4	4	4	4	4	4	4	4	4	4	4
	d	5/8	15.9	3/4	19	3/4	19	3/4	19	1	25.4	1	25.4	1 1/8	28.6
1 1/2	A	5	127	6 1/8	155.6	6 1/8	155.6	6 1/8	155.6	7	177.8	7	177.8	8	203
	b	11/16	17.5	13/16	20.6	7/8	22.2	7/8	22.2	1 1/4	31.8	1 1/4	31.8	1 3/4	44.5
	D2	2 7/8	73 98	2 7/8	73	2 7/8	73	2 7/8	73	2 7/8	73	2 7/8	73	2 7/8	73
	D1	3 7/8	4	4 1/2	114	4 1/2	114	4 1/2	114	4 7/8	124	4 7/8	124	5 3/4	146
	n	4	4	4	4	4	4	4	4	4	4	4	4	4	4
	d	5/8	. 15.9	7/8	22.2	7/8	22.2	7/8	22.2	1 1/8	28.6	1 1/8	28.6	1 1/4	31.8
2	A	6	152.4	6 1/2	165.1	6 1/2	165.1	6 1/2	165.1	8 1/2	215.9	8 1/2	215.9	9 1/4	234.9
	b	3/4	19	7/8	22.2	1	25.4	1	25.4	1 1/2	38.1	1 1/2	38.1	2	50.8
	D2	3 5/8	92.1	3 5/8	92.1	3 5/8	92.1	3 5/8	92.1	3 5/8	92.1	3 5/8	92.1	3 5/8	92.1
	D1	4 3/4	121	5	127	5	127	5	127	6 1/2	165.1	6 1/2	165.1	6 3/4	171
	n	4	4	8	8	8	8	8	8	8	8	8	8	8	8
	d	3/4	19	3/4	19	3/4	19	3/4	19	1	25.4	1	25.4	1 1/8	28.6
2 1/2	A	7	177.8	7 1/2	190.5	7 1/2	190.5	7 1/2	190.5	9 5/8	244	9 5/8	244	10 1/2	266.7
	b	7/8	22.2	1	25.4	1 1/8	28.6	1 1/8	28.6	1 5/8	41.3	1 5/8	41.3	2 1/4	57.2
	D2	4 1/8	104.8	4 1/8	104.8	4 1/8	104.8	4 1/8	104.8	4 1/8	105	4 1/8	105	4 1/8	105
	D1	5 1/2	139.7	5 7/8	149.2	5 7/8	149.2	5 7/8	149.2	7 1/2	190.5	7 1/2	190.5	7 3/4	197
	n	4	4	8	8	8	8	8	8	8	8	8	8	8	8
	d	3/4	19	7/8	22.2	7/8	22.2	7/8	22.2	1 1/8	28.6	1 1/8	28.6	1 1/4	31.8

Application

Food & Beverage
Paper Industry
Pharmaceutical
Hospital Equipment
Textiles
Dairy
Aircraft
Chemicals
Others Parts in Machinery

Testing

Hydrostatic Test
Macro Test
Ultra Sonic Test (UT)
Micro Test
Hardness Test
Radiography Test
Pitting Resistance Test
PMI Testing
Mechanical Testing
X-ray detector

Packing

Wooden Boxes
Shrink-Wrappedt
Carton Boxes
Wooden Crates
Wooden Pallets